2003-06-15 22:56:48 +02:00
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/* GNU/Linux native-dependent code common to multiple platforms.
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2004-03-29 20:07:14 +02:00
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Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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2003-06-15 22:56:48 +02:00
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "target.h"
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2004-09-16 Andrew Cagney <cagney@gnu.org>
* lin-lwp.c: Delete file.
* linux-nat.c: Include "gdb_assert.h", "gdb_string.h", <unistd.h>,
<sys/syscall.h>, "gdbthread.h", "gdbcmd.h", "regcache.h".
(status_to_str, init_lwp_list, add_lwp, delete_lwp)
(find_lwp_pid, iterate_over_lwps, lin_lwp_attach_lwp)
(linux_nat_attach, detach_callback, linux_nat_detach)
(resume_callback, resume_clear_callback, linux_nat_resume)
(kill_lwp, linux_nat_handle_extended, wait_lwp, stop_callback)
(stop_wait_callback, linux_nat_has_pending, flush_callback)
(status_callback, running_callback, count_events_callback)
(select_singlestep_lwp_callback, select_event_lwp_callback)
(cancel_breakpoints_callback, select_event_lwp, resumed_callback)
(child_wait, stop_and_resume_callback, linux_nat_wait)
(kill_callback, kill_wait_callback, linux_nat_kill)
(linux_nat_create_inferior, linux_nat_mourn_inferior)
(linux_nat_xfer_memory, linux_nat_thread_alive)
(linux_nat_pid_to_str, init_linux_nat_ops, sigchld_handler)
(_initialize_linux_nat): New functions.
* Makefile.in: Update all dependencies.
* config/sparc/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/sparc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/s390/s390.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/ppc64-linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/pa/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/mips/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/m68k/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/ia64/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/arm/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/alpha/alpha-linux.mh (NATDEPFILES): Remove lin-lwp.o.
2004-09-27 21:55:18 +02:00
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#include "gdb_string.h"
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2003-06-15 22:56:48 +02:00
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#include "gdb_wait.h"
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2004-09-16 Andrew Cagney <cagney@gnu.org>
* lin-lwp.c: Delete file.
* linux-nat.c: Include "gdb_assert.h", "gdb_string.h", <unistd.h>,
<sys/syscall.h>, "gdbthread.h", "gdbcmd.h", "regcache.h".
(status_to_str, init_lwp_list, add_lwp, delete_lwp)
(find_lwp_pid, iterate_over_lwps, lin_lwp_attach_lwp)
(linux_nat_attach, detach_callback, linux_nat_detach)
(resume_callback, resume_clear_callback, linux_nat_resume)
(kill_lwp, linux_nat_handle_extended, wait_lwp, stop_callback)
(stop_wait_callback, linux_nat_has_pending, flush_callback)
(status_callback, running_callback, count_events_callback)
(select_singlestep_lwp_callback, select_event_lwp_callback)
(cancel_breakpoints_callback, select_event_lwp, resumed_callback)
(child_wait, stop_and_resume_callback, linux_nat_wait)
(kill_callback, kill_wait_callback, linux_nat_kill)
(linux_nat_create_inferior, linux_nat_mourn_inferior)
(linux_nat_xfer_memory, linux_nat_thread_alive)
(linux_nat_pid_to_str, init_linux_nat_ops, sigchld_handler)
(_initialize_linux_nat): New functions.
* Makefile.in: Update all dependencies.
* config/sparc/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/sparc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/s390/s390.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/ppc64-linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/pa/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/mips/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/m68k/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/ia64/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/arm/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/alpha/alpha-linux.mh (NATDEPFILES): Remove lin-lwp.o.
2004-09-27 21:55:18 +02:00
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#include "gdb_assert.h"
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#ifdef HAVE_TKILL_SYSCALL
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#include <unistd.h>
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#include <sys/syscall.h>
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#endif
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2003-06-15 22:56:48 +02:00
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#include <sys/ptrace.h>
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2003-06-20 00:52:04 +02:00
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#include "linux-nat.h"
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2004-09-16 Andrew Cagney <cagney@gnu.org>
* lin-lwp.c: Delete file.
* linux-nat.c: Include "gdb_assert.h", "gdb_string.h", <unistd.h>,
<sys/syscall.h>, "gdbthread.h", "gdbcmd.h", "regcache.h".
(status_to_str, init_lwp_list, add_lwp, delete_lwp)
(find_lwp_pid, iterate_over_lwps, lin_lwp_attach_lwp)
(linux_nat_attach, detach_callback, linux_nat_detach)
(resume_callback, resume_clear_callback, linux_nat_resume)
(kill_lwp, linux_nat_handle_extended, wait_lwp, stop_callback)
(stop_wait_callback, linux_nat_has_pending, flush_callback)
(status_callback, running_callback, count_events_callback)
(select_singlestep_lwp_callback, select_event_lwp_callback)
(cancel_breakpoints_callback, select_event_lwp, resumed_callback)
(child_wait, stop_and_resume_callback, linux_nat_wait)
(kill_callback, kill_wait_callback, linux_nat_kill)
(linux_nat_create_inferior, linux_nat_mourn_inferior)
(linux_nat_xfer_memory, linux_nat_thread_alive)
(linux_nat_pid_to_str, init_linux_nat_ops, sigchld_handler)
(_initialize_linux_nat): New functions.
* Makefile.in: Update all dependencies.
* config/sparc/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/sparc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/s390/s390.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/ppc64-linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/pa/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/mips/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/m68k/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/ia64/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/arm/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/alpha/alpha-linux.mh (NATDEPFILES): Remove lin-lwp.o.
2004-09-27 21:55:18 +02:00
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#include "gdbthread.h"
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#include "gdbcmd.h"
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#include "regcache.h"
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2003-06-20 00:52:04 +02:00
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2003-06-15 22:56:48 +02:00
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/* If the system headers did not provide the constants, hard-code the normal
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values. */
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#ifndef PTRACE_EVENT_FORK
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#define PTRACE_SETOPTIONS 0x4200
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#define PTRACE_GETEVENTMSG 0x4201
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/* options set using PTRACE_SETOPTIONS */
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#define PTRACE_O_TRACESYSGOOD 0x00000001
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#define PTRACE_O_TRACEFORK 0x00000002
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#define PTRACE_O_TRACEVFORK 0x00000004
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#define PTRACE_O_TRACECLONE 0x00000008
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#define PTRACE_O_TRACEEXEC 0x00000010
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2003-08-17 22:17:02 +02:00
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#define PTRACE_O_TRACEVFORKDONE 0x00000020
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#define PTRACE_O_TRACEEXIT 0x00000040
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2003-06-15 22:56:48 +02:00
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/* Wait extended result codes for the above trace options. */
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#define PTRACE_EVENT_FORK 1
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#define PTRACE_EVENT_VFORK 2
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#define PTRACE_EVENT_CLONE 3
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#define PTRACE_EVENT_EXEC 4
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2003-08-17 22:17:02 +02:00
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#define PTRACE_EVENT_VFORKDONE 5
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#define PTRACE_EVENT_EXIT 6
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2003-06-15 22:56:48 +02:00
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#endif /* PTRACE_EVENT_FORK */
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/* We can't always assume that this flag is available, but all systems
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with the ptrace event handlers also have __WALL, so it's safe to use
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here. */
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#ifndef __WALL
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#define __WALL 0x40000000 /* Wait for any child. */
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#endif
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2004-09-16 Andrew Cagney <cagney@gnu.org>
* lin-lwp.c: Delete file.
* linux-nat.c: Include "gdb_assert.h", "gdb_string.h", <unistd.h>,
<sys/syscall.h>, "gdbthread.h", "gdbcmd.h", "regcache.h".
(status_to_str, init_lwp_list, add_lwp, delete_lwp)
(find_lwp_pid, iterate_over_lwps, lin_lwp_attach_lwp)
(linux_nat_attach, detach_callback, linux_nat_detach)
(resume_callback, resume_clear_callback, linux_nat_resume)
(kill_lwp, linux_nat_handle_extended, wait_lwp, stop_callback)
(stop_wait_callback, linux_nat_has_pending, flush_callback)
(status_callback, running_callback, count_events_callback)
(select_singlestep_lwp_callback, select_event_lwp_callback)
(cancel_breakpoints_callback, select_event_lwp, resumed_callback)
(child_wait, stop_and_resume_callback, linux_nat_wait)
(kill_callback, kill_wait_callback, linux_nat_kill)
(linux_nat_create_inferior, linux_nat_mourn_inferior)
(linux_nat_xfer_memory, linux_nat_thread_alive)
(linux_nat_pid_to_str, init_linux_nat_ops, sigchld_handler)
(_initialize_linux_nat): New functions.
* Makefile.in: Update all dependencies.
* config/sparc/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/sparc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/s390/s390.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/ppc64-linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/pa/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/mips/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/m68k/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/ia64/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/arm/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/alpha/alpha-linux.mh (NATDEPFILES): Remove lin-lwp.o.
2004-09-27 21:55:18 +02:00
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static int debug_linux_nat;
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2003-08-17 20:22:25 +02:00
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extern struct target_ops child_ops;
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2003-08-17 22:17:02 +02:00
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static int linux_parent_pid;
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2003-06-19 01:33:31 +02:00
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struct simple_pid_list
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{
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int pid;
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struct simple_pid_list *next;
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};
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struct simple_pid_list *stopped_pids;
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2003-06-15 22:56:48 +02:00
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/* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
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can not be used, 1 if it can. */
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static int linux_supports_tracefork_flag = -1;
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2003-08-17 22:17:02 +02:00
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/* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
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PTRACE_O_TRACEVFORKDONE. */
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static int linux_supports_tracevforkdone_flag = -1;
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2003-06-19 01:33:31 +02:00
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/* Trivial list manipulation functions to keep track of a list of
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new stopped processes. */
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static void
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add_to_pid_list (struct simple_pid_list **listp, int pid)
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{
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struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list));
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new_pid->pid = pid;
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new_pid->next = *listp;
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*listp = new_pid;
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}
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static int
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pull_pid_from_list (struct simple_pid_list **listp, int pid)
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{
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struct simple_pid_list **p;
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for (p = listp; *p != NULL; p = &(*p)->next)
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if ((*p)->pid == pid)
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{
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struct simple_pid_list *next = (*p)->next;
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xfree (*p);
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*p = next;
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return 1;
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}
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return 0;
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}
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void
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linux_record_stopped_pid (int pid)
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{
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add_to_pid_list (&stopped_pids, pid);
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}
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2003-06-15 22:56:48 +02:00
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/* A helper function for linux_test_for_tracefork, called after fork (). */
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static void
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linux_tracefork_child (void)
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{
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int ret;
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ptrace (PTRACE_TRACEME, 0, 0, 0);
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kill (getpid (), SIGSTOP);
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fork ();
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exit (0);
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}
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/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. We
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create a child process, attach to it, use PTRACE_SETOPTIONS to enable
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fork tracing, and let it fork. If the process exits, we assume that
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we can't use TRACEFORK; if we get the fork notification, and we can
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extract the new child's PID, then we assume that we can. */
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static void
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linux_test_for_tracefork (void)
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{
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int child_pid, ret, status;
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long second_pid;
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child_pid = fork ();
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if (child_pid == -1)
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perror_with_name ("linux_test_for_tracefork: fork");
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if (child_pid == 0)
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linux_tracefork_child ();
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ret = waitpid (child_pid, &status, 0);
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if (ret == -1)
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perror_with_name ("linux_test_for_tracefork: waitpid");
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else if (ret != child_pid)
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error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret);
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if (! WIFSTOPPED (status))
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error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status);
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linux_supports_tracefork_flag = 0;
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ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
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if (ret != 0)
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{
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ptrace (PTRACE_KILL, child_pid, 0, 0);
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waitpid (child_pid, &status, 0);
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return;
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}
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2003-08-17 22:17:02 +02:00
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/* Check whether PTRACE_O_TRACEVFORKDONE is available. */
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ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0,
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PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE);
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linux_supports_tracevforkdone_flag = (ret == 0);
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2003-06-15 22:56:48 +02:00
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ptrace (PTRACE_CONT, child_pid, 0, 0);
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ret = waitpid (child_pid, &status, 0);
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if (ret == child_pid && WIFSTOPPED (status)
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&& status >> 16 == PTRACE_EVENT_FORK)
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{
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second_pid = 0;
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|
|
ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid);
|
|
|
|
|
if (ret == 0 && second_pid != 0)
|
|
|
|
|
{
|
|
|
|
|
int second_status;
|
|
|
|
|
|
|
|
|
|
linux_supports_tracefork_flag = 1;
|
|
|
|
|
waitpid (second_pid, &second_status, 0);
|
|
|
|
|
ptrace (PTRACE_DETACH, second_pid, 0, 0);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (WIFSTOPPED (status))
|
|
|
|
|
{
|
|
|
|
|
ptrace (PTRACE_DETACH, child_pid, 0, 0);
|
|
|
|
|
waitpid (child_pid, &status, 0);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Return non-zero iff we have tracefork functionality available.
|
|
|
|
|
This function also sets linux_supports_tracefork_flag. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
linux_supports_tracefork (void)
|
|
|
|
|
{
|
|
|
|
|
if (linux_supports_tracefork_flag == -1)
|
|
|
|
|
linux_test_for_tracefork ();
|
|
|
|
|
return linux_supports_tracefork_flag;
|
|
|
|
|
}
|
|
|
|
|
|
2003-08-17 22:17:02 +02:00
|
|
|
|
static int
|
|
|
|
|
linux_supports_tracevforkdone (void)
|
|
|
|
|
{
|
|
|
|
|
if (linux_supports_tracefork_flag == -1)
|
|
|
|
|
linux_test_for_tracefork ();
|
|
|
|
|
return linux_supports_tracevforkdone_flag;
|
|
|
|
|
}
|
|
|
|
|
|
2003-06-15 22:56:48 +02:00
|
|
|
|
|
2003-08-17 20:22:25 +02:00
|
|
|
|
void
|
|
|
|
|
linux_enable_event_reporting (ptid_t ptid)
|
|
|
|
|
{
|
|
|
|
|
int pid = ptid_get_pid (ptid);
|
|
|
|
|
int options;
|
|
|
|
|
|
|
|
|
|
if (! linux_supports_tracefork ())
|
|
|
|
|
return;
|
|
|
|
|
|
2004-03-29 20:07:14 +02:00
|
|
|
|
options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC
|
|
|
|
|
| PTRACE_O_TRACECLONE;
|
2003-08-17 22:17:02 +02:00
|
|
|
|
if (linux_supports_tracevforkdone ())
|
|
|
|
|
options |= PTRACE_O_TRACEVFORKDONE;
|
|
|
|
|
|
|
|
|
|
/* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
|
|
|
|
|
read-only process state. */
|
2003-08-17 20:22:25 +02:00
|
|
|
|
|
|
|
|
|
ptrace (PTRACE_SETOPTIONS, pid, 0, options);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
child_post_attach (int pid)
|
|
|
|
|
{
|
|
|
|
|
linux_enable_event_reporting (pid_to_ptid (pid));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
linux_child_post_startup_inferior (ptid_t ptid)
|
|
|
|
|
{
|
|
|
|
|
linux_enable_event_reporting (ptid);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifndef LINUX_CHILD_POST_STARTUP_INFERIOR
|
|
|
|
|
void
|
|
|
|
|
child_post_startup_inferior (ptid_t ptid)
|
|
|
|
|
{
|
|
|
|
|
linux_child_post_startup_inferior (ptid);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
2003-06-15 22:56:48 +02:00
|
|
|
|
int
|
2003-08-17 20:22:25 +02:00
|
|
|
|
child_follow_fork (int follow_child)
|
2003-06-15 22:56:48 +02:00
|
|
|
|
{
|
2003-08-17 20:22:25 +02:00
|
|
|
|
ptid_t last_ptid;
|
|
|
|
|
struct target_waitstatus last_status;
|
2003-08-17 22:17:02 +02:00
|
|
|
|
int has_vforked;
|
2003-08-17 20:22:25 +02:00
|
|
|
|
int parent_pid, child_pid;
|
|
|
|
|
|
|
|
|
|
get_last_target_status (&last_ptid, &last_status);
|
2003-08-17 22:17:02 +02:00
|
|
|
|
has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED);
|
2003-08-17 20:22:25 +02:00
|
|
|
|
parent_pid = ptid_get_pid (last_ptid);
|
|
|
|
|
child_pid = last_status.value.related_pid;
|
|
|
|
|
|
|
|
|
|
if (! follow_child)
|
|
|
|
|
{
|
|
|
|
|
/* We're already attached to the parent, by default. */
|
|
|
|
|
|
|
|
|
|
/* Before detaching from the child, remove all breakpoints from
|
|
|
|
|
it. (This won't actually modify the breakpoint list, but will
|
|
|
|
|
physically remove the breakpoints from the child.) */
|
2003-08-17 22:17:02 +02:00
|
|
|
|
/* If we vforked this will remove the breakpoints from the parent
|
|
|
|
|
also, but they'll be reinserted below. */
|
2003-08-17 20:22:25 +02:00
|
|
|
|
detach_breakpoints (child_pid);
|
|
|
|
|
|
|
|
|
|
fprintf_filtered (gdb_stdout,
|
|
|
|
|
"Detaching after fork from child process %d.\n",
|
|
|
|
|
child_pid);
|
|
|
|
|
|
|
|
|
|
ptrace (PTRACE_DETACH, child_pid, 0, 0);
|
2003-08-17 22:17:02 +02:00
|
|
|
|
|
|
|
|
|
if (has_vforked)
|
|
|
|
|
{
|
|
|
|
|
if (linux_supports_tracevforkdone ())
|
|
|
|
|
{
|
|
|
|
|
int status;
|
|
|
|
|
|
|
|
|
|
ptrace (PTRACE_CONT, parent_pid, 0, 0);
|
|
|
|
|
waitpid (parent_pid, &status, __WALL);
|
|
|
|
|
if ((status >> 16) != PTRACE_EVENT_VFORKDONE)
|
|
|
|
|
warning ("Unexpected waitpid result %06x when waiting for "
|
|
|
|
|
"vfork-done", status);
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
/* We can't insert breakpoints until the child has
|
|
|
|
|
finished with the shared memory region. We need to
|
|
|
|
|
wait until that happens. Ideal would be to just
|
|
|
|
|
call:
|
|
|
|
|
- ptrace (PTRACE_SYSCALL, parent_pid, 0, 0);
|
|
|
|
|
- waitpid (parent_pid, &status, __WALL);
|
|
|
|
|
However, most architectures can't handle a syscall
|
|
|
|
|
being traced on the way out if it wasn't traced on
|
|
|
|
|
the way in.
|
|
|
|
|
|
|
|
|
|
We might also think to loop, continuing the child
|
|
|
|
|
until it exits or gets a SIGTRAP. One problem is
|
|
|
|
|
that the child might call ptrace with PTRACE_TRACEME.
|
|
|
|
|
|
|
|
|
|
There's no simple and reliable way to figure out when
|
|
|
|
|
the vforked child will be done with its copy of the
|
|
|
|
|
shared memory. We could step it out of the syscall,
|
|
|
|
|
two instructions, let it go, and then single-step the
|
|
|
|
|
parent once. When we have hardware single-step, this
|
|
|
|
|
would work; with software single-step it could still
|
|
|
|
|
be made to work but we'd have to be able to insert
|
|
|
|
|
single-step breakpoints in the child, and we'd have
|
|
|
|
|
to insert -just- the single-step breakpoint in the
|
|
|
|
|
parent. Very awkward.
|
|
|
|
|
|
|
|
|
|
In the end, the best we can do is to make sure it
|
|
|
|
|
runs for a little while. Hopefully it will be out of
|
|
|
|
|
range of any breakpoints we reinsert. Usually this
|
|
|
|
|
is only the single-step breakpoint at vfork's return
|
|
|
|
|
point. */
|
|
|
|
|
|
|
|
|
|
usleep (10000);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Since we vforked, breakpoints were removed in the parent
|
|
|
|
|
too. Put them back. */
|
|
|
|
|
reattach_breakpoints (parent_pid);
|
|
|
|
|
}
|
2003-08-17 20:22:25 +02:00
|
|
|
|
}
|
2003-06-15 22:56:48 +02:00
|
|
|
|
else
|
2003-08-17 20:22:25 +02:00
|
|
|
|
{
|
|
|
|
|
char child_pid_spelling[40];
|
|
|
|
|
|
|
|
|
|
/* Needed to keep the breakpoint lists in sync. */
|
2003-08-17 22:17:02 +02:00
|
|
|
|
if (! has_vforked)
|
|
|
|
|
detach_breakpoints (child_pid);
|
2003-08-17 20:22:25 +02:00
|
|
|
|
|
|
|
|
|
/* Before detaching from the parent, remove all breakpoints from it. */
|
|
|
|
|
remove_breakpoints ();
|
|
|
|
|
|
|
|
|
|
fprintf_filtered (gdb_stdout,
|
|
|
|
|
"Attaching after fork to child process %d.\n",
|
|
|
|
|
child_pid);
|
|
|
|
|
|
2003-08-17 22:17:02 +02:00
|
|
|
|
/* If we're vforking, we may want to hold on to the parent until
|
|
|
|
|
the child exits or execs. At exec time we can remove the old
|
|
|
|
|
breakpoints from the parent and detach it; at exit time we
|
|
|
|
|
could do the same (or even, sneakily, resume debugging it - the
|
|
|
|
|
child's exec has failed, or something similar).
|
|
|
|
|
|
|
|
|
|
This doesn't clean up "properly", because we can't call
|
|
|
|
|
target_detach, but that's OK; if the current target is "child",
|
|
|
|
|
then it doesn't need any further cleanups, and lin_lwp will
|
|
|
|
|
generally not encounter vfork (vfork is defined to fork
|
|
|
|
|
in libpthread.so).
|
|
|
|
|
|
|
|
|
|
The holding part is very easy if we have VFORKDONE events;
|
|
|
|
|
but keeping track of both processes is beyond GDB at the
|
|
|
|
|
moment. So we don't expose the parent to the rest of GDB.
|
|
|
|
|
Instead we quietly hold onto it until such time as we can
|
|
|
|
|
safely resume it. */
|
|
|
|
|
|
|
|
|
|
if (has_vforked)
|
|
|
|
|
linux_parent_pid = parent_pid;
|
|
|
|
|
else
|
|
|
|
|
target_detach (NULL, 0);
|
2003-08-17 20:22:25 +02:00
|
|
|
|
|
|
|
|
|
inferior_ptid = pid_to_ptid (child_pid);
|
|
|
|
|
push_target (&child_ops);
|
|
|
|
|
|
|
|
|
|
/* Reset breakpoints in the child as appropriate. */
|
|
|
|
|
follow_inferior_reset_breakpoints ();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
ptid_t
|
|
|
|
|
linux_handle_extended_wait (int pid, int status,
|
|
|
|
|
struct target_waitstatus *ourstatus)
|
|
|
|
|
{
|
|
|
|
|
int event = status >> 16;
|
|
|
|
|
|
2004-03-29 20:07:14 +02:00
|
|
|
|
if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK
|
|
|
|
|
|| event == PTRACE_EVENT_CLONE)
|
2003-08-17 20:22:25 +02:00
|
|
|
|
{
|
|
|
|
|
unsigned long new_pid;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid);
|
|
|
|
|
|
|
|
|
|
/* If we haven't already seen the new PID stop, wait for it now. */
|
|
|
|
|
if (! pull_pid_from_list (&stopped_pids, new_pid))
|
|
|
|
|
{
|
|
|
|
|
/* The new child has a pending SIGSTOP. We can't affect it until it
|
2004-03-29 20:07:14 +02:00
|
|
|
|
hits the SIGSTOP, but we're already attached. */
|
2003-08-17 20:22:25 +02:00
|
|
|
|
do {
|
2004-03-29 20:07:14 +02:00
|
|
|
|
ret = waitpid (new_pid, &status,
|
|
|
|
|
(event == PTRACE_EVENT_CLONE) ? __WCLONE : 0);
|
2003-08-17 20:22:25 +02:00
|
|
|
|
} while (ret == -1 && errno == EINTR);
|
|
|
|
|
if (ret == -1)
|
|
|
|
|
perror_with_name ("waiting for new child");
|
|
|
|
|
else if (ret != new_pid)
|
|
|
|
|
internal_error (__FILE__, __LINE__,
|
|
|
|
|
"wait returned unexpected PID %d", ret);
|
|
|
|
|
else if (!WIFSTOPPED (status) || WSTOPSIG (status) != SIGSTOP)
|
|
|
|
|
internal_error (__FILE__, __LINE__,
|
|
|
|
|
"wait returned unexpected status 0x%x", status);
|
|
|
|
|
}
|
|
|
|
|
|
2004-03-29 20:07:14 +02:00
|
|
|
|
if (event == PTRACE_EVENT_FORK)
|
|
|
|
|
ourstatus->kind = TARGET_WAITKIND_FORKED;
|
|
|
|
|
else if (event == PTRACE_EVENT_VFORK)
|
|
|
|
|
ourstatus->kind = TARGET_WAITKIND_VFORKED;
|
|
|
|
|
else
|
|
|
|
|
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
|
|
|
|
|
|
2003-08-17 20:22:25 +02:00
|
|
|
|
ourstatus->value.related_pid = new_pid;
|
|
|
|
|
return inferior_ptid;
|
|
|
|
|
}
|
|
|
|
|
|
2003-08-17 22:17:02 +02:00
|
|
|
|
if (event == PTRACE_EVENT_EXEC)
|
|
|
|
|
{
|
|
|
|
|
ourstatus->kind = TARGET_WAITKIND_EXECD;
|
|
|
|
|
ourstatus->value.execd_pathname
|
|
|
|
|
= xstrdup (child_pid_to_exec_file (pid));
|
|
|
|
|
|
|
|
|
|
if (linux_parent_pid)
|
|
|
|
|
{
|
|
|
|
|
detach_breakpoints (linux_parent_pid);
|
|
|
|
|
ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0);
|
|
|
|
|
|
|
|
|
|
linux_parent_pid = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return inferior_ptid;
|
|
|
|
|
}
|
|
|
|
|
|
2003-08-17 20:22:25 +02:00
|
|
|
|
internal_error (__FILE__, __LINE__,
|
|
|
|
|
"unknown ptrace event %d", event);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
child_insert_fork_catchpoint (int pid)
|
|
|
|
|
{
|
|
|
|
|
if (! linux_supports_tracefork ())
|
2003-06-15 22:56:48 +02:00
|
|
|
|
error ("Your system does not support fork catchpoints.");
|
2003-08-17 20:22:25 +02:00
|
|
|
|
|
|
|
|
|
return 0;
|
2003-06-15 22:56:48 +02:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
child_insert_vfork_catchpoint (int pid)
|
|
|
|
|
{
|
2003-08-17 22:17:02 +02:00
|
|
|
|
if (!linux_supports_tracefork ())
|
2003-06-15 22:56:48 +02:00
|
|
|
|
error ("Your system does not support vfork catchpoints.");
|
2003-08-17 22:17:02 +02:00
|
|
|
|
|
|
|
|
|
return 0;
|
2003-06-15 22:56:48 +02:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
child_insert_exec_catchpoint (int pid)
|
|
|
|
|
{
|
2003-08-17 22:17:02 +02:00
|
|
|
|
if (!linux_supports_tracefork ())
|
2003-06-15 22:56:48 +02:00
|
|
|
|
error ("Your system does not support exec catchpoints.");
|
2003-08-17 22:17:02 +02:00
|
|
|
|
|
|
|
|
|
return 0;
|
2003-06-15 22:56:48 +02:00
|
|
|
|
}
|
|
|
|
|
|
2003-08-17 20:22:25 +02:00
|
|
|
|
void
|
|
|
|
|
kill_inferior (void)
|
|
|
|
|
{
|
|
|
|
|
int status;
|
|
|
|
|
int pid = PIDGET (inferior_ptid);
|
|
|
|
|
struct target_waitstatus last;
|
|
|
|
|
ptid_t last_ptid;
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
if (pid == 0)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
/* If we're stopped while forking and we haven't followed yet, kill the
|
|
|
|
|
other task. We need to do this first because the parent will be
|
|
|
|
|
sleeping if this is a vfork. */
|
|
|
|
|
|
|
|
|
|
get_last_target_status (&last_ptid, &last);
|
2003-06-15 22:56:48 +02:00
|
|
|
|
|
2003-08-17 20:22:25 +02:00
|
|
|
|
if (last.kind == TARGET_WAITKIND_FORKED
|
|
|
|
|
|| last.kind == TARGET_WAITKIND_VFORKED)
|
|
|
|
|
{
|
2004-08-15 17:51:40 +02:00
|
|
|
|
ptrace (PT_KILL, last.value.related_pid, 0, 0);
|
2003-08-17 20:22:25 +02:00
|
|
|
|
ptrace_wait (null_ptid, &status);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Kill the current process. */
|
2004-08-15 17:51:40 +02:00
|
|
|
|
ptrace (PT_KILL, pid, 0, 0);
|
2003-08-17 20:22:25 +02:00
|
|
|
|
ret = ptrace_wait (null_ptid, &status);
|
|
|
|
|
|
|
|
|
|
/* We might get a SIGCHLD instead of an exit status. This is
|
|
|
|
|
aggravated by the first kill above - a child has just died. */
|
|
|
|
|
|
|
|
|
|
while (ret == pid && WIFSTOPPED (status))
|
|
|
|
|
{
|
2004-08-15 17:51:40 +02:00
|
|
|
|
ptrace (PT_KILL, pid, 0, 0);
|
2003-08-17 20:22:25 +02:00
|
|
|
|
ret = ptrace_wait (null_ptid, &status);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
target_mourn_inferior ();
|
|
|
|
|
}
|
2004-09-16 Andrew Cagney <cagney@gnu.org>
* lin-lwp.c: Delete file.
* linux-nat.c: Include "gdb_assert.h", "gdb_string.h", <unistd.h>,
<sys/syscall.h>, "gdbthread.h", "gdbcmd.h", "regcache.h".
(status_to_str, init_lwp_list, add_lwp, delete_lwp)
(find_lwp_pid, iterate_over_lwps, lin_lwp_attach_lwp)
(linux_nat_attach, detach_callback, linux_nat_detach)
(resume_callback, resume_clear_callback, linux_nat_resume)
(kill_lwp, linux_nat_handle_extended, wait_lwp, stop_callback)
(stop_wait_callback, linux_nat_has_pending, flush_callback)
(status_callback, running_callback, count_events_callback)
(select_singlestep_lwp_callback, select_event_lwp_callback)
(cancel_breakpoints_callback, select_event_lwp, resumed_callback)
(child_wait, stop_and_resume_callback, linux_nat_wait)
(kill_callback, kill_wait_callback, linux_nat_kill)
(linux_nat_create_inferior, linux_nat_mourn_inferior)
(linux_nat_xfer_memory, linux_nat_thread_alive)
(linux_nat_pid_to_str, init_linux_nat_ops, sigchld_handler)
(_initialize_linux_nat): New functions.
* Makefile.in: Update all dependencies.
* config/sparc/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/sparc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/s390/s390.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/ppc64-linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/powerpc/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/pa/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/mips/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/m68k/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/ia64/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux64.mh (NATDEPFILES): Remove lin-lwp.o.
* config/i386/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/arm/linux.mh (NATDEPFILES): Remove lin-lwp.o.
* config/alpha/alpha-linux.mh (NATDEPFILES): Remove lin-lwp.o.
2004-09-27 21:55:18 +02:00
|
|
|
|
|
|
|
|
|
/* On GNU/Linux there are no real LWP's. The closest thing to LWP's
|
|
|
|
|
are processes sharing the same VM space. A multi-threaded process
|
|
|
|
|
is basically a group of such processes. However, such a grouping
|
|
|
|
|
is almost entirely a user-space issue; the kernel doesn't enforce
|
|
|
|
|
such a grouping at all (this might change in the future). In
|
|
|
|
|
general, we'll rely on the threads library (i.e. the GNU/Linux
|
|
|
|
|
Threads library) to provide such a grouping.
|
|
|
|
|
|
|
|
|
|
It is perfectly well possible to write a multi-threaded application
|
|
|
|
|
without the assistance of a threads library, by using the clone
|
|
|
|
|
system call directly. This module should be able to give some
|
|
|
|
|
rudimentary support for debugging such applications if developers
|
|
|
|
|
specify the CLONE_PTRACE flag in the clone system call, and are
|
|
|
|
|
using the Linux kernel 2.4 or above.
|
|
|
|
|
|
|
|
|
|
Note that there are some peculiarities in GNU/Linux that affect
|
|
|
|
|
this code:
|
|
|
|
|
|
|
|
|
|
- In general one should specify the __WCLONE flag to waitpid in
|
|
|
|
|
order to make it report events for any of the cloned processes
|
|
|
|
|
(and leave it out for the initial process). However, if a cloned
|
|
|
|
|
process has exited the exit status is only reported if the
|
|
|
|
|
__WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
|
|
|
|
|
we cannot use it since GDB must work on older systems too.
|
|
|
|
|
|
|
|
|
|
- When a traced, cloned process exits and is waited for by the
|
|
|
|
|
debugger, the kernel reassigns it to the original parent and
|
|
|
|
|
keeps it around as a "zombie". Somehow, the GNU/Linux Threads
|
|
|
|
|
library doesn't notice this, which leads to the "zombie problem":
|
|
|
|
|
When debugged a multi-threaded process that spawns a lot of
|
|
|
|
|
threads will run out of processes, even if the threads exit,
|
|
|
|
|
because the "zombies" stay around. */
|
|
|
|
|
|
|
|
|
|
/* List of known LWPs. */
|
|
|
|
|
static struct lwp_info *lwp_list;
|
|
|
|
|
|
|
|
|
|
/* Number of LWPs in the list. */
|
|
|
|
|
static int num_lwps;
|
|
|
|
|
|
|
|
|
|
/* Non-zero if we're running in "threaded" mode. */
|
|
|
|
|
static int threaded;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#define GET_LWP(ptid) ptid_get_lwp (ptid)
|
|
|
|
|
#define GET_PID(ptid) ptid_get_pid (ptid)
|
|
|
|
|
#define is_lwp(ptid) (GET_LWP (ptid) != 0)
|
|
|
|
|
#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
|
|
|
|
|
|
|
|
|
|
/* If the last reported event was a SIGTRAP, this variable is set to
|
|
|
|
|
the process id of the LWP/thread that got it. */
|
|
|
|
|
ptid_t trap_ptid;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* This module's target-specific operations. */
|
|
|
|
|
static struct target_ops linux_nat_ops;
|
|
|
|
|
|
|
|
|
|
/* The standard child operations. */
|
|
|
|
|
extern struct target_ops child_ops;
|
|
|
|
|
|
|
|
|
|
/* Since we cannot wait (in linux_nat_wait) for the initial process and
|
|
|
|
|
any cloned processes with a single call to waitpid, we have to use
|
|
|
|
|
the WNOHANG flag and call waitpid in a loop. To optimize
|
|
|
|
|
things a bit we use `sigsuspend' to wake us up when a process has
|
|
|
|
|
something to report (it will send us a SIGCHLD if it has). To make
|
|
|
|
|
this work we have to juggle with the signal mask. We save the
|
|
|
|
|
original signal mask such that we can restore it before creating a
|
|
|
|
|
new process in order to avoid blocking certain signals in the
|
|
|
|
|
inferior. We then block SIGCHLD during the waitpid/sigsuspend
|
|
|
|
|
loop. */
|
|
|
|
|
|
|
|
|
|
/* Original signal mask. */
|
|
|
|
|
static sigset_t normal_mask;
|
|
|
|
|
|
|
|
|
|
/* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
|
|
|
|
|
_initialize_linux_nat. */
|
|
|
|
|
static sigset_t suspend_mask;
|
|
|
|
|
|
|
|
|
|
/* Signals to block to make that sigsuspend work. */
|
|
|
|
|
static sigset_t blocked_mask;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Prototypes for local functions. */
|
|
|
|
|
static int stop_wait_callback (struct lwp_info *lp, void *data);
|
|
|
|
|
static int linux_nat_thread_alive (ptid_t ptid);
|
|
|
|
|
|
|
|
|
|
/* Convert wait status STATUS to a string. Used for printing debug
|
|
|
|
|
messages only. */
|
|
|
|
|
|
|
|
|
|
static char *
|
|
|
|
|
status_to_str (int status)
|
|
|
|
|
{
|
|
|
|
|
static char buf[64];
|
|
|
|
|
|
|
|
|
|
if (WIFSTOPPED (status))
|
|
|
|
|
snprintf (buf, sizeof (buf), "%s (stopped)",
|
|
|
|
|
strsignal (WSTOPSIG (status)));
|
|
|
|
|
else if (WIFSIGNALED (status))
|
|
|
|
|
snprintf (buf, sizeof (buf), "%s (terminated)",
|
|
|
|
|
strsignal (WSTOPSIG (status)));
|
|
|
|
|
else
|
|
|
|
|
snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status));
|
|
|
|
|
|
|
|
|
|
return buf;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Initialize the list of LWPs. Note that this module, contrary to
|
|
|
|
|
what GDB's generic threads layer does for its thread list,
|
|
|
|
|
re-initializes the LWP lists whenever we mourn or detach (which
|
|
|
|
|
doesn't involve mourning) the inferior. */
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
init_lwp_list (void)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *lp, *lpnext;
|
|
|
|
|
|
|
|
|
|
for (lp = lwp_list; lp; lp = lpnext)
|
|
|
|
|
{
|
|
|
|
|
lpnext = lp->next;
|
|
|
|
|
xfree (lp);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
lwp_list = NULL;
|
|
|
|
|
num_lwps = 0;
|
|
|
|
|
threaded = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Add the LWP specified by PID to the list. If this causes the
|
|
|
|
|
number of LWPs to become larger than one, go into "threaded" mode.
|
|
|
|
|
Return a pointer to the structure describing the new LWP. */
|
|
|
|
|
|
|
|
|
|
static struct lwp_info *
|
|
|
|
|
add_lwp (ptid_t ptid)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *lp;
|
|
|
|
|
|
|
|
|
|
gdb_assert (is_lwp (ptid));
|
|
|
|
|
|
|
|
|
|
lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info));
|
|
|
|
|
|
|
|
|
|
memset (lp, 0, sizeof (struct lwp_info));
|
|
|
|
|
|
|
|
|
|
lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
|
|
|
|
|
|
|
|
|
|
lp->ptid = ptid;
|
|
|
|
|
|
|
|
|
|
lp->next = lwp_list;
|
|
|
|
|
lwp_list = lp;
|
|
|
|
|
if (++num_lwps > 1)
|
|
|
|
|
threaded = 1;
|
|
|
|
|
|
|
|
|
|
return lp;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Remove the LWP specified by PID from the list. */
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
delete_lwp (ptid_t ptid)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *lp, *lpprev;
|
|
|
|
|
|
|
|
|
|
lpprev = NULL;
|
|
|
|
|
|
|
|
|
|
for (lp = lwp_list; lp; lpprev = lp, lp = lp->next)
|
|
|
|
|
if (ptid_equal (lp->ptid, ptid))
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
if (!lp)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
/* We don't go back to "non-threaded" mode if the number of threads
|
|
|
|
|
becomes less than two. */
|
|
|
|
|
num_lwps--;
|
|
|
|
|
|
|
|
|
|
if (lpprev)
|
|
|
|
|
lpprev->next = lp->next;
|
|
|
|
|
else
|
|
|
|
|
lwp_list = lp->next;
|
|
|
|
|
|
|
|
|
|
xfree (lp);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Return a pointer to the structure describing the LWP corresponding
|
|
|
|
|
to PID. If no corresponding LWP could be found, return NULL. */
|
|
|
|
|
|
|
|
|
|
static struct lwp_info *
|
|
|
|
|
find_lwp_pid (ptid_t ptid)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *lp;
|
|
|
|
|
int lwp;
|
|
|
|
|
|
|
|
|
|
if (is_lwp (ptid))
|
|
|
|
|
lwp = GET_LWP (ptid);
|
|
|
|
|
else
|
|
|
|
|
lwp = GET_PID (ptid);
|
|
|
|
|
|
|
|
|
|
for (lp = lwp_list; lp; lp = lp->next)
|
|
|
|
|
if (lwp == GET_LWP (lp->ptid))
|
|
|
|
|
return lp;
|
|
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Call CALLBACK with its second argument set to DATA for every LWP in
|
|
|
|
|
the list. If CALLBACK returns 1 for a particular LWP, return a
|
|
|
|
|
pointer to the structure describing that LWP immediately.
|
|
|
|
|
Otherwise return NULL. */
|
|
|
|
|
|
|
|
|
|
struct lwp_info *
|
|
|
|
|
iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *lp, *lpnext;
|
|
|
|
|
|
|
|
|
|
for (lp = lwp_list; lp; lp = lpnext)
|
|
|
|
|
{
|
|
|
|
|
lpnext = lp->next;
|
|
|
|
|
if ((*callback) (lp, data))
|
|
|
|
|
return lp;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Attach to the LWP specified by PID. If VERBOSE is non-zero, print
|
|
|
|
|
a message telling the user that a new LWP has been added to the
|
|
|
|
|
process. */
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
lin_lwp_attach_lwp (ptid_t ptid, int verbose)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *lp, *found_lp;
|
|
|
|
|
|
|
|
|
|
gdb_assert (is_lwp (ptid));
|
|
|
|
|
|
|
|
|
|
/* Make sure SIGCHLD is blocked. We don't want SIGCHLD events
|
|
|
|
|
to interrupt either the ptrace() or waitpid() calls below. */
|
|
|
|
|
if (!sigismember (&blocked_mask, SIGCHLD))
|
|
|
|
|
{
|
|
|
|
|
sigaddset (&blocked_mask, SIGCHLD);
|
|
|
|
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (verbose)
|
|
|
|
|
printf_filtered ("[New %s]\n", target_pid_to_str (ptid));
|
|
|
|
|
|
|
|
|
|
found_lp = lp = find_lwp_pid (ptid);
|
|
|
|
|
if (lp == NULL)
|
|
|
|
|
lp = add_lwp (ptid);
|
|
|
|
|
|
|
|
|
|
/* We assume that we're already attached to any LWP that has an id
|
|
|
|
|
equal to the overall process id, and to any LWP that is already
|
|
|
|
|
in our list of LWPs. If we're not seeing exit events from threads
|
|
|
|
|
and we've had PID wraparound since we last tried to stop all threads,
|
|
|
|
|
this assumption might be wrong; fortunately, this is very unlikely
|
|
|
|
|
to happen. */
|
|
|
|
|
if (GET_LWP (ptid) != GET_PID (ptid) && found_lp == NULL)
|
|
|
|
|
{
|
|
|
|
|
pid_t pid;
|
|
|
|
|
int status;
|
|
|
|
|
|
|
|
|
|
if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
|
|
|
|
|
error ("Can't attach %s: %s", target_pid_to_str (ptid),
|
|
|
|
|
safe_strerror (errno));
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
|
|
|
|
|
target_pid_to_str (ptid));
|
|
|
|
|
|
|
|
|
|
pid = waitpid (GET_LWP (ptid), &status, 0);
|
|
|
|
|
if (pid == -1 && errno == ECHILD)
|
|
|
|
|
{
|
|
|
|
|
/* Try again with __WCLONE to check cloned processes. */
|
|
|
|
|
pid = waitpid (GET_LWP (ptid), &status, __WCLONE);
|
|
|
|
|
lp->cloned = 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
gdb_assert (pid == GET_LWP (ptid)
|
|
|
|
|
&& WIFSTOPPED (status) && WSTOPSIG (status));
|
|
|
|
|
|
|
|
|
|
child_post_attach (pid);
|
|
|
|
|
|
|
|
|
|
lp->stopped = 1;
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLAL: waitpid %s received %s\n",
|
|
|
|
|
target_pid_to_str (ptid),
|
|
|
|
|
status_to_str (status));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
/* We assume that the LWP representing the original process is
|
|
|
|
|
already stopped. Mark it as stopped in the data structure
|
|
|
|
|
that the linux ptrace layer uses to keep track of threads.
|
|
|
|
|
Note that this won't have already been done since the main
|
|
|
|
|
thread will have, we assume, been stopped by an attach from a
|
|
|
|
|
different layer. */
|
|
|
|
|
lp->stopped = 1;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
linux_nat_attach (char *args, int from_tty)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *lp;
|
|
|
|
|
pid_t pid;
|
|
|
|
|
int status;
|
|
|
|
|
|
|
|
|
|
/* FIXME: We should probably accept a list of process id's, and
|
|
|
|
|
attach all of them. */
|
|
|
|
|
child_ops.to_attach (args, from_tty);
|
|
|
|
|
|
|
|
|
|
/* Add the initial process as the first LWP to the list. */
|
|
|
|
|
lp = add_lwp (BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)));
|
|
|
|
|
|
|
|
|
|
/* Make sure the initial process is stopped. The user-level threads
|
|
|
|
|
layer might want to poke around in the inferior, and that won't
|
|
|
|
|
work if things haven't stabilized yet. */
|
|
|
|
|
pid = waitpid (GET_PID (inferior_ptid), &status, 0);
|
|
|
|
|
if (pid == -1 && errno == ECHILD)
|
|
|
|
|
{
|
|
|
|
|
warning ("%s is a cloned process", target_pid_to_str (inferior_ptid));
|
|
|
|
|
|
|
|
|
|
/* Try again with __WCLONE to check cloned processes. */
|
|
|
|
|
pid = waitpid (GET_PID (inferior_ptid), &status, __WCLONE);
|
|
|
|
|
lp->cloned = 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
gdb_assert (pid == GET_PID (inferior_ptid)
|
|
|
|
|
&& WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP);
|
|
|
|
|
|
|
|
|
|
lp->stopped = 1;
|
|
|
|
|
|
|
|
|
|
/* Fake the SIGSTOP that core GDB expects. */
|
|
|
|
|
lp->status = W_STOPCODE (SIGSTOP);
|
|
|
|
|
lp->resumed = 1;
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLA: waitpid %ld, faking SIGSTOP\n", (long) pid);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
detach_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat && lp->status)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n",
|
|
|
|
|
strsignal (WSTOPSIG (lp->status)),
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
|
|
|
|
|
while (lp->signalled && lp->stopped)
|
|
|
|
|
{
|
|
|
|
|
errno = 0;
|
|
|
|
|
if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0,
|
|
|
|
|
WSTOPSIG (lp->status)) < 0)
|
|
|
|
|
error ("Can't continue %s: %s", target_pid_to_str (lp->ptid),
|
|
|
|
|
safe_strerror (errno));
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"DC: PTRACE_CONTINUE (%s, 0, %s) (OK)\n",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
status_to_str (lp->status));
|
|
|
|
|
|
|
|
|
|
lp->stopped = 0;
|
|
|
|
|
lp->signalled = 0;
|
|
|
|
|
lp->status = 0;
|
|
|
|
|
/* FIXME drow/2003-08-26: There was a call to stop_wait_callback
|
|
|
|
|
here. But since lp->signalled was cleared above,
|
|
|
|
|
stop_wait_callback didn't do anything; the process was left
|
|
|
|
|
running. Shouldn't we be waiting for it to stop?
|
|
|
|
|
I've removed the call, since stop_wait_callback now does do
|
|
|
|
|
something when called with lp->signalled == 0. */
|
|
|
|
|
|
|
|
|
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* We don't actually detach from the LWP that has an id equal to the
|
|
|
|
|
overall process id just yet. */
|
|
|
|
|
if (GET_LWP (lp->ptid) != GET_PID (lp->ptid))
|
|
|
|
|
{
|
|
|
|
|
errno = 0;
|
|
|
|
|
if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0,
|
|
|
|
|
WSTOPSIG (lp->status)) < 0)
|
|
|
|
|
error ("Can't detach %s: %s", target_pid_to_str (lp->ptid),
|
|
|
|
|
safe_strerror (errno));
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"PTRACE_DETACH (%s, %s, 0) (OK)\n",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
strsignal (WSTOPSIG (lp->status)));
|
|
|
|
|
|
|
|
|
|
delete_lwp (lp->ptid);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
linux_nat_detach (char *args, int from_tty)
|
|
|
|
|
{
|
|
|
|
|
iterate_over_lwps (detach_callback, NULL);
|
|
|
|
|
|
|
|
|
|
/* Only the initial process should be left right now. */
|
|
|
|
|
gdb_assert (num_lwps == 1);
|
|
|
|
|
|
|
|
|
|
trap_ptid = null_ptid;
|
|
|
|
|
|
|
|
|
|
/* Destroy LWP info; it's no longer valid. */
|
|
|
|
|
init_lwp_list ();
|
|
|
|
|
|
|
|
|
|
/* Restore the original signal mask. */
|
|
|
|
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
|
|
|
|
sigemptyset (&blocked_mask);
|
|
|
|
|
|
|
|
|
|
inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid));
|
|
|
|
|
child_ops.to_detach (args, from_tty);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Resume LP. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
resume_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
if (lp->stopped && lp->status == 0)
|
|
|
|
|
{
|
|
|
|
|
struct thread_info *tp;
|
|
|
|
|
|
|
|
|
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), 0, TARGET_SIGNAL_0);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
lp->stopped = 0;
|
|
|
|
|
lp->step = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
resume_clear_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
lp->resumed = 0;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
resume_set_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
lp->resumed = 1;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
linux_nat_resume (ptid_t ptid, int step, enum target_signal signo)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *lp;
|
|
|
|
|
int resume_all;
|
|
|
|
|
|
|
|
|
|
/* A specific PTID means `step only this process id'. */
|
|
|
|
|
resume_all = (PIDGET (ptid) == -1);
|
|
|
|
|
|
|
|
|
|
if (resume_all)
|
|
|
|
|
iterate_over_lwps (resume_set_callback, NULL);
|
|
|
|
|
else
|
|
|
|
|
iterate_over_lwps (resume_clear_callback, NULL);
|
|
|
|
|
|
|
|
|
|
/* If PID is -1, it's the current inferior that should be
|
|
|
|
|
handled specially. */
|
|
|
|
|
if (PIDGET (ptid) == -1)
|
|
|
|
|
ptid = inferior_ptid;
|
|
|
|
|
|
|
|
|
|
lp = find_lwp_pid (ptid);
|
|
|
|
|
if (lp)
|
|
|
|
|
{
|
|
|
|
|
ptid = pid_to_ptid (GET_LWP (lp->ptid));
|
|
|
|
|
|
|
|
|
|
/* Remember if we're stepping. */
|
|
|
|
|
lp->step = step;
|
|
|
|
|
|
|
|
|
|
/* Mark this LWP as resumed. */
|
|
|
|
|
lp->resumed = 1;
|
|
|
|
|
|
|
|
|
|
/* If we have a pending wait status for this thread, there is no
|
|
|
|
|
point in resuming the process. */
|
|
|
|
|
if (lp->status)
|
|
|
|
|
{
|
|
|
|
|
/* FIXME: What should we do if we are supposed to continue
|
|
|
|
|
this thread with a signal? */
|
|
|
|
|
gdb_assert (signo == TARGET_SIGNAL_0);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Mark LWP as not stopped to prevent it from being continued by
|
|
|
|
|
resume_callback. */
|
|
|
|
|
lp->stopped = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (resume_all)
|
|
|
|
|
iterate_over_lwps (resume_callback, NULL);
|
|
|
|
|
|
|
|
|
|
child_resume (ptid, step, signo);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLR: %s %s, %s (resume event thread)\n",
|
|
|
|
|
step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
|
|
|
|
target_pid_to_str (ptid),
|
|
|
|
|
signo ? strsignal (signo) : "0");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Issue kill to specified lwp. */
|
|
|
|
|
|
|
|
|
|
static int tkill_failed;
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
kill_lwp (int lwpid, int signo)
|
|
|
|
|
{
|
|
|
|
|
errno = 0;
|
|
|
|
|
|
|
|
|
|
/* Use tkill, if possible, in case we are using nptl threads. If tkill
|
|
|
|
|
fails, then we are not using nptl threads and we should be using kill. */
|
|
|
|
|
|
|
|
|
|
#ifdef HAVE_TKILL_SYSCALL
|
|
|
|
|
if (!tkill_failed)
|
|
|
|
|
{
|
|
|
|
|
int ret = syscall (__NR_tkill, lwpid, signo);
|
|
|
|
|
if (errno != ENOSYS)
|
|
|
|
|
return ret;
|
|
|
|
|
errno = 0;
|
|
|
|
|
tkill_failed = 1;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
return kill (lwpid, signo);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Handle a GNU/Linux extended wait response. Most of the work we
|
|
|
|
|
just pass off to linux_handle_extended_wait, but if it reports a
|
|
|
|
|
clone event we need to add the new LWP to our list (and not report
|
|
|
|
|
the trap to higher layers). This function returns non-zero if
|
|
|
|
|
the event should be ignored and we should wait again. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
linux_nat_handle_extended (struct lwp_info *lp, int status)
|
|
|
|
|
{
|
|
|
|
|
linux_handle_extended_wait (GET_LWP (lp->ptid), status,
|
|
|
|
|
&lp->waitstatus);
|
|
|
|
|
|
|
|
|
|
/* TARGET_WAITKIND_SPURIOUS is used to indicate clone events. */
|
|
|
|
|
if (lp->waitstatus.kind == TARGET_WAITKIND_SPURIOUS)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *new_lp;
|
|
|
|
|
new_lp = add_lwp (BUILD_LWP (lp->waitstatus.value.related_pid,
|
|
|
|
|
GET_PID (inferior_ptid)));
|
|
|
|
|
new_lp->cloned = 1;
|
|
|
|
|
new_lp->stopped = 1;
|
|
|
|
|
|
|
|
|
|
lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLHE: Got clone event from LWP %ld, resuming\n",
|
|
|
|
|
GET_LWP (lp->ptid));
|
|
|
|
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
|
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
|
|
|
|
|
exited. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
wait_lwp (struct lwp_info *lp)
|
|
|
|
|
{
|
|
|
|
|
pid_t pid;
|
|
|
|
|
int status;
|
|
|
|
|
int thread_dead = 0;
|
|
|
|
|
|
|
|
|
|
gdb_assert (!lp->stopped);
|
|
|
|
|
gdb_assert (lp->status == 0);
|
|
|
|
|
|
|
|
|
|
pid = waitpid (GET_LWP (lp->ptid), &status, 0);
|
|
|
|
|
if (pid == -1 && errno == ECHILD)
|
|
|
|
|
{
|
|
|
|
|
pid = waitpid (GET_LWP (lp->ptid), &status, __WCLONE);
|
|
|
|
|
if (pid == -1 && errno == ECHILD)
|
|
|
|
|
{
|
|
|
|
|
/* The thread has previously exited. We need to delete it
|
|
|
|
|
now because, for some vendor 2.4 kernels with NPTL
|
|
|
|
|
support backported, there won't be an exit event unless
|
|
|
|
|
it is the main thread. 2.6 kernels will report an exit
|
|
|
|
|
event for each thread that exits, as expected. */
|
|
|
|
|
thread_dead = 1;
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!thread_dead)
|
|
|
|
|
{
|
|
|
|
|
gdb_assert (pid == GET_LWP (lp->ptid));
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"WL: waitpid %s received %s\n",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
status_to_str (status));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Check if the thread has exited. */
|
|
|
|
|
if (WIFEXITED (status) || WIFSIGNALED (status))
|
|
|
|
|
{
|
|
|
|
|
thread_dead = 1;
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (thread_dead)
|
|
|
|
|
{
|
|
|
|
|
if (in_thread_list (lp->ptid))
|
|
|
|
|
{
|
|
|
|
|
/* Core GDB cannot deal with us deleting the current thread. */
|
|
|
|
|
if (!ptid_equal (lp->ptid, inferior_ptid))
|
|
|
|
|
delete_thread (lp->ptid);
|
|
|
|
|
printf_unfiltered ("[%s exited]\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
delete_lwp (lp->ptid);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
gdb_assert (WIFSTOPPED (status));
|
|
|
|
|
|
|
|
|
|
/* Handle GNU/Linux's extended waitstatus for trace events. */
|
|
|
|
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
|
|
|
|
|
{
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"WL: Handling extended status 0x%06x\n",
|
|
|
|
|
status);
|
|
|
|
|
if (linux_nat_handle_extended (lp, status))
|
|
|
|
|
return wait_lwp (lp);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return status;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Send a SIGSTOP to LP. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
stop_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
if (!lp->stopped && !lp->signalled)
|
|
|
|
|
{
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"SC: kill %s **<SIGSTOP>**\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
errno = 0;
|
|
|
|
|
ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"SC: lwp kill %d %s\n",
|
|
|
|
|
ret,
|
|
|
|
|
errno ? safe_strerror (errno) : "ERRNO-OK");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
lp->signalled = 1;
|
|
|
|
|
gdb_assert (lp->status == 0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Wait until LP is stopped. If DATA is non-null it is interpreted as
|
|
|
|
|
a pointer to a set of signals to be flushed immediately. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
stop_wait_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
sigset_t *flush_mask = data;
|
|
|
|
|
|
|
|
|
|
if (!lp->stopped)
|
|
|
|
|
{
|
|
|
|
|
int status;
|
|
|
|
|
|
|
|
|
|
status = wait_lwp (lp);
|
|
|
|
|
if (status == 0)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
/* Ignore any signals in FLUSH_MASK. */
|
|
|
|
|
if (flush_mask && sigismember (flush_mask, WSTOPSIG (status)))
|
|
|
|
|
{
|
|
|
|
|
if (!lp->signalled)
|
|
|
|
|
{
|
|
|
|
|
lp->stopped = 1;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
errno = 0;
|
|
|
|
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"PTRACE_CONT %s, 0, 0 (%s)\n",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
errno ? safe_strerror (errno) : "OK");
|
|
|
|
|
|
|
|
|
|
return stop_wait_callback (lp, flush_mask);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (WSTOPSIG (status) != SIGSTOP)
|
|
|
|
|
{
|
|
|
|
|
if (WSTOPSIG (status) == SIGTRAP)
|
|
|
|
|
{
|
|
|
|
|
/* If a LWP other than the LWP that we're reporting an
|
|
|
|
|
event for has hit a GDB breakpoint (as opposed to
|
|
|
|
|
some random trap signal), then just arrange for it to
|
|
|
|
|
hit it again later. We don't keep the SIGTRAP status
|
|
|
|
|
and don't forward the SIGTRAP signal to the LWP. We
|
|
|
|
|
will handle the current event, eventually we will
|
|
|
|
|
resume all LWPs, and this one will get its breakpoint
|
|
|
|
|
trap again.
|
|
|
|
|
|
|
|
|
|
If we do not do this, then we run the risk that the
|
|
|
|
|
user will delete or disable the breakpoint, but the
|
|
|
|
|
thread will have already tripped on it. */
|
|
|
|
|
|
|
|
|
|
/* Now resume this LWP and get the SIGSTOP event. */
|
|
|
|
|
errno = 0;
|
|
|
|
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"PTRACE_CONT %s, 0, 0 (%s)\n",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
errno ? safe_strerror (errno) : "OK");
|
|
|
|
|
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"SWC: Candidate SIGTRAP event in %s\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
/* Hold the SIGTRAP for handling by linux_nat_wait. */
|
|
|
|
|
stop_wait_callback (lp, data);
|
|
|
|
|
/* If there's another event, throw it back into the queue. */
|
|
|
|
|
if (lp->status)
|
|
|
|
|
{
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"SWC: kill %s, %s\n",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
status_to_str ((int) status));
|
|
|
|
|
}
|
|
|
|
|
kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
|
|
|
|
|
}
|
|
|
|
|
/* Save the sigtrap event. */
|
|
|
|
|
lp->status = status;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
/* The thread was stopped with a signal other than
|
|
|
|
|
SIGSTOP, and didn't accidentally trip a breakpoint. */
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"SWC: Pending event %s in %s\n",
|
|
|
|
|
status_to_str ((int) status),
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
/* Now resume this LWP and get the SIGSTOP event. */
|
|
|
|
|
errno = 0;
|
|
|
|
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
errno ? safe_strerror (errno) : "OK");
|
|
|
|
|
|
|
|
|
|
/* Hold this event/waitstatus while we check to see if
|
|
|
|
|
there are any more (we still want to get that SIGSTOP). */
|
|
|
|
|
stop_wait_callback (lp, data);
|
|
|
|
|
/* If the lp->status field is still empty, use it to hold
|
|
|
|
|
this event. If not, then this event must be returned
|
|
|
|
|
to the event queue of the LWP. */
|
|
|
|
|
if (lp->status == 0)
|
|
|
|
|
lp->status = status;
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"SWC: kill %s, %s\n",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
status_to_str ((int) status));
|
|
|
|
|
}
|
|
|
|
|
kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status));
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
/* We caught the SIGSTOP that we intended to catch, so
|
|
|
|
|
there's no SIGSTOP pending. */
|
|
|
|
|
lp->stopped = 1;
|
|
|
|
|
lp->signalled = 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Check whether PID has any pending signals in FLUSH_MASK. If so set
|
|
|
|
|
the appropriate bits in PENDING, and return 1 - otherwise return 0. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
linux_nat_has_pending (int pid, sigset_t *pending, sigset_t *flush_mask)
|
|
|
|
|
{
|
|
|
|
|
sigset_t blocked, ignored;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
linux_proc_pending_signals (pid, pending, &blocked, &ignored);
|
|
|
|
|
|
|
|
|
|
if (!flush_mask)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
for (i = 1; i < NSIG; i++)
|
|
|
|
|
if (sigismember (pending, i))
|
|
|
|
|
if (!sigismember (flush_mask, i)
|
|
|
|
|
|| sigismember (&blocked, i)
|
|
|
|
|
|| sigismember (&ignored, i))
|
|
|
|
|
sigdelset (pending, i);
|
|
|
|
|
|
|
|
|
|
if (sigisemptyset (pending))
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* DATA is interpreted as a mask of signals to flush. If LP has
|
|
|
|
|
signals pending, and they are all in the flush mask, then arrange
|
|
|
|
|
to flush them. LP should be stopped, as should all other threads
|
|
|
|
|
it might share a signal queue with. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
flush_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
sigset_t *flush_mask = data;
|
|
|
|
|
sigset_t pending, intersection, blocked, ignored;
|
|
|
|
|
int pid, status;
|
|
|
|
|
|
|
|
|
|
/* Normally, when an LWP exits, it is removed from the LWP list. The
|
|
|
|
|
last LWP isn't removed till later, however. So if there is only
|
|
|
|
|
one LWP on the list, make sure it's alive. */
|
|
|
|
|
if (lwp_list == lp && lp->next == NULL)
|
|
|
|
|
if (!linux_nat_thread_alive (lp->ptid))
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
/* Just because the LWP is stopped doesn't mean that new signals
|
|
|
|
|
can't arrive from outside, so this function must be careful of
|
|
|
|
|
race conditions. However, because all threads are stopped, we
|
|
|
|
|
can assume that the pending mask will not shrink unless we resume
|
|
|
|
|
the LWP, and that it will then get another signal. We can't
|
|
|
|
|
control which one, however. */
|
|
|
|
|
|
|
|
|
|
if (lp->status)
|
|
|
|
|
{
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
printf_unfiltered ("FC: LP has pending status %06x\n", lp->status);
|
|
|
|
|
if (WIFSTOPPED (lp->status) && sigismember (flush_mask, WSTOPSIG (lp->status)))
|
|
|
|
|
lp->status = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
while (linux_nat_has_pending (GET_LWP (lp->ptid), &pending, flush_mask))
|
|
|
|
|
{
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
errno = 0;
|
|
|
|
|
ret = ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stderr,
|
|
|
|
|
"FC: Sent PTRACE_CONT, ret %d %d\n", ret, errno);
|
|
|
|
|
|
|
|
|
|
lp->stopped = 0;
|
|
|
|
|
stop_wait_callback (lp, flush_mask);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stderr,
|
|
|
|
|
"FC: Wait finished; saved status is %d\n",
|
|
|
|
|
lp->status);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Return non-zero if LP has a wait status pending. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
status_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
/* Only report a pending wait status if we pretend that this has
|
|
|
|
|
indeed been resumed. */
|
|
|
|
|
return (lp->status != 0 && lp->resumed);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Return non-zero if LP isn't stopped. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
running_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
return (lp->stopped == 0 || (lp->status != 0 && lp->resumed));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Count the LWP's that have had events. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
count_events_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
int *count = data;
|
|
|
|
|
|
|
|
|
|
gdb_assert (count != NULL);
|
|
|
|
|
|
|
|
|
|
/* Count only LWPs that have a SIGTRAP event pending. */
|
|
|
|
|
if (lp->status != 0
|
|
|
|
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
|
|
|
|
(*count)++;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Select the LWP (if any) that is currently being single-stepped. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
if (lp->step && lp->status != 0)
|
|
|
|
|
return 1;
|
|
|
|
|
else
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Select the Nth LWP that has had a SIGTRAP event. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
select_event_lwp_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
int *selector = data;
|
|
|
|
|
|
|
|
|
|
gdb_assert (selector != NULL);
|
|
|
|
|
|
|
|
|
|
/* Select only LWPs that have a SIGTRAP event pending. */
|
|
|
|
|
if (lp->status != 0
|
|
|
|
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
|
|
|
|
if ((*selector)-- == 0)
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
cancel_breakpoints_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *event_lp = data;
|
|
|
|
|
|
|
|
|
|
/* Leave the LWP that has been elected to receive a SIGTRAP alone. */
|
|
|
|
|
if (lp == event_lp)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
/* If a LWP other than the LWP that we're reporting an event for has
|
|
|
|
|
hit a GDB breakpoint (as opposed to some random trap signal),
|
|
|
|
|
then just arrange for it to hit it again later. We don't keep
|
|
|
|
|
the SIGTRAP status and don't forward the SIGTRAP signal to the
|
|
|
|
|
LWP. We will handle the current event, eventually we will resume
|
|
|
|
|
all LWPs, and this one will get its breakpoint trap again.
|
|
|
|
|
|
|
|
|
|
If we do not do this, then we run the risk that the user will
|
|
|
|
|
delete or disable the breakpoint, but the LWP will have already
|
|
|
|
|
tripped on it. */
|
|
|
|
|
|
|
|
|
|
if (lp->status != 0
|
|
|
|
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP
|
|
|
|
|
&& breakpoint_inserted_here_p (read_pc_pid (lp->ptid) -
|
|
|
|
|
DECR_PC_AFTER_BREAK))
|
|
|
|
|
{
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"CBC: Push back breakpoint for %s\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
|
|
|
|
|
/* Back up the PC if necessary. */
|
|
|
|
|
if (DECR_PC_AFTER_BREAK)
|
|
|
|
|
write_pc_pid (read_pc_pid (lp->ptid) - DECR_PC_AFTER_BREAK, lp->ptid);
|
|
|
|
|
|
|
|
|
|
/* Throw away the SIGTRAP. */
|
|
|
|
|
lp->status = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Select one LWP out of those that have events pending. */
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
select_event_lwp (struct lwp_info **orig_lp, int *status)
|
|
|
|
|
{
|
|
|
|
|
int num_events = 0;
|
|
|
|
|
int random_selector;
|
|
|
|
|
struct lwp_info *event_lp;
|
|
|
|
|
|
|
|
|
|
/* Record the wait status for the origional LWP. */
|
|
|
|
|
(*orig_lp)->status = *status;
|
|
|
|
|
|
|
|
|
|
/* Give preference to any LWP that is being single-stepped. */
|
|
|
|
|
event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL);
|
|
|
|
|
if (event_lp != NULL)
|
|
|
|
|
{
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"SEL: Select single-step %s\n",
|
|
|
|
|
target_pid_to_str (event_lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
/* No single-stepping LWP. Select one at random, out of those
|
|
|
|
|
which have had SIGTRAP events. */
|
|
|
|
|
|
|
|
|
|
/* First see how many SIGTRAP events we have. */
|
|
|
|
|
iterate_over_lwps (count_events_callback, &num_events);
|
|
|
|
|
|
|
|
|
|
/* Now randomly pick a LWP out of those that have had a SIGTRAP. */
|
|
|
|
|
random_selector = (int)
|
|
|
|
|
((num_events * (double) rand ()) / (RAND_MAX + 1.0));
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat && num_events > 1)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"SEL: Found %d SIGTRAP events, selecting #%d\n",
|
|
|
|
|
num_events, random_selector);
|
|
|
|
|
|
|
|
|
|
event_lp = iterate_over_lwps (select_event_lwp_callback,
|
|
|
|
|
&random_selector);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (event_lp != NULL)
|
|
|
|
|
{
|
|
|
|
|
/* Switch the event LWP. */
|
|
|
|
|
*orig_lp = event_lp;
|
|
|
|
|
*status = event_lp->status;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Flush the wait status for the event LWP. */
|
|
|
|
|
(*orig_lp)->status = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Return non-zero if LP has been resumed. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
resumed_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
return lp->resumed;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CHILD_WAIT
|
|
|
|
|
|
|
|
|
|
/* We need to override child_wait to support attaching to cloned
|
|
|
|
|
processes, since a normal wait (as done by the default version)
|
|
|
|
|
ignores those processes. */
|
|
|
|
|
|
|
|
|
|
/* Wait for child PTID to do something. Return id of the child,
|
|
|
|
|
minus_one_ptid in case of error; store status into *OURSTATUS. */
|
|
|
|
|
|
|
|
|
|
ptid_t
|
|
|
|
|
child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
|
|
|
|
|
{
|
|
|
|
|
int save_errno;
|
|
|
|
|
int status;
|
|
|
|
|
pid_t pid;
|
|
|
|
|
|
|
|
|
|
ourstatus->kind = TARGET_WAITKIND_IGNORE;
|
|
|
|
|
|
|
|
|
|
do
|
|
|
|
|
{
|
|
|
|
|
set_sigint_trap (); /* Causes SIGINT to be passed on to the
|
|
|
|
|
attached process. */
|
|
|
|
|
set_sigio_trap ();
|
|
|
|
|
|
|
|
|
|
pid = waitpid (GET_PID (ptid), &status, 0);
|
|
|
|
|
if (pid == -1 && errno == ECHILD)
|
|
|
|
|
/* Try again with __WCLONE to check cloned processes. */
|
|
|
|
|
pid = waitpid (GET_PID (ptid), &status, __WCLONE);
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"CW: waitpid %ld received %s\n",
|
|
|
|
|
(long) pid, status_to_str (status));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
save_errno = errno;
|
|
|
|
|
|
|
|
|
|
/* Make sure we don't report an event for the exit of the
|
|
|
|
|
original program, if we've detached from it. */
|
|
|
|
|
if (pid != -1 && !WIFSTOPPED (status) && pid != GET_PID (inferior_ptid))
|
|
|
|
|
{
|
|
|
|
|
pid = -1;
|
|
|
|
|
save_errno = EINTR;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Check for stop events reported by a process we didn't already
|
|
|
|
|
know about - in this case, anything other than inferior_ptid.
|
|
|
|
|
|
|
|
|
|
If we're expecting to receive stopped processes after fork,
|
|
|
|
|
vfork, and clone events, then we'll just add the new one to
|
|
|
|
|
our list and go back to waiting for the event to be reported
|
|
|
|
|
- the stopped process might be returned from waitpid before
|
|
|
|
|
or after the event is. If we want to handle debugging of
|
|
|
|
|
CLONE_PTRACE processes we need to do more here, i.e. switch
|
|
|
|
|
to multi-threaded mode. */
|
|
|
|
|
if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP
|
|
|
|
|
&& pid != GET_PID (inferior_ptid))
|
|
|
|
|
{
|
|
|
|
|
linux_record_stopped_pid (pid);
|
|
|
|
|
pid = -1;
|
|
|
|
|
save_errno = EINTR;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Handle GNU/Linux's extended waitstatus for trace events. */
|
|
|
|
|
if (pid != -1 && WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP
|
|
|
|
|
&& status >> 16 != 0)
|
|
|
|
|
{
|
|
|
|
|
linux_handle_extended_wait (pid, status, ourstatus);
|
|
|
|
|
|
|
|
|
|
/* If we see a clone event, detach the child, and don't
|
|
|
|
|
report the event. It would be nice to offer some way to
|
|
|
|
|
switch into a non-thread-db based threaded mode at this
|
|
|
|
|
point. */
|
|
|
|
|
if (ourstatus->kind == TARGET_WAITKIND_SPURIOUS)
|
|
|
|
|
{
|
|
|
|
|
ptrace (PTRACE_DETACH, ourstatus->value.related_pid, 0, 0);
|
|
|
|
|
ourstatus->kind = TARGET_WAITKIND_IGNORE;
|
|
|
|
|
ptrace (PTRACE_CONT, pid, 0, 0);
|
|
|
|
|
pid = -1;
|
|
|
|
|
save_errno = EINTR;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
clear_sigio_trap ();
|
|
|
|
|
clear_sigint_trap ();
|
|
|
|
|
}
|
|
|
|
|
while (pid == -1 && save_errno == EINTR);
|
|
|
|
|
|
|
|
|
|
if (pid == -1)
|
|
|
|
|
{
|
|
|
|
|
warning ("Child process unexpectedly missing: %s",
|
|
|
|
|
safe_strerror (errno));
|
|
|
|
|
|
|
|
|
|
/* Claim it exited with unknown signal. */
|
|
|
|
|
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
|
|
|
|
|
ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
|
|
|
|
|
return minus_one_ptid;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (ourstatus->kind == TARGET_WAITKIND_IGNORE)
|
|
|
|
|
store_waitstatus (ourstatus, status);
|
|
|
|
|
|
|
|
|
|
return pid_to_ptid (pid);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* Stop an active thread, verify it still exists, then resume it. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
stop_and_resume_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *ptr;
|
|
|
|
|
|
|
|
|
|
if (!lp->stopped && !lp->signalled)
|
|
|
|
|
{
|
|
|
|
|
stop_callback (lp, NULL);
|
|
|
|
|
stop_wait_callback (lp, NULL);
|
|
|
|
|
/* Resume if the lwp still exists. */
|
|
|
|
|
for (ptr = lwp_list; ptr; ptr = ptr->next)
|
|
|
|
|
if (lp == ptr)
|
|
|
|
|
{
|
|
|
|
|
resume_callback (lp, NULL);
|
|
|
|
|
resume_set_callback (lp, NULL);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static ptid_t
|
|
|
|
|
linux_nat_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
|
|
|
|
|
{
|
|
|
|
|
struct lwp_info *lp = NULL;
|
|
|
|
|
int options = 0;
|
|
|
|
|
int status = 0;
|
|
|
|
|
pid_t pid = PIDGET (ptid);
|
|
|
|
|
sigset_t flush_mask;
|
|
|
|
|
|
|
|
|
|
sigemptyset (&flush_mask);
|
|
|
|
|
|
|
|
|
|
/* Make sure SIGCHLD is blocked. */
|
|
|
|
|
if (!sigismember (&blocked_mask, SIGCHLD))
|
|
|
|
|
{
|
|
|
|
|
sigaddset (&blocked_mask, SIGCHLD);
|
|
|
|
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
retry:
|
|
|
|
|
|
|
|
|
|
/* Make sure there is at least one LWP that has been resumed, at
|
|
|
|
|
least if there are any LWPs at all. */
|
|
|
|
|
gdb_assert (num_lwps == 0 || iterate_over_lwps (resumed_callback, NULL));
|
|
|
|
|
|
|
|
|
|
/* First check if there is a LWP with a wait status pending. */
|
|
|
|
|
if (pid == -1)
|
|
|
|
|
{
|
|
|
|
|
/* Any LWP that's been resumed will do. */
|
|
|
|
|
lp = iterate_over_lwps (status_callback, NULL);
|
|
|
|
|
if (lp)
|
|
|
|
|
{
|
|
|
|
|
status = lp->status;
|
|
|
|
|
lp->status = 0;
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat && status)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: Using pending wait status %s for %s.\n",
|
|
|
|
|
status_to_str (status),
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* But if we don't fine one, we'll have to wait, and check both
|
|
|
|
|
cloned and uncloned processes. We start with the cloned
|
|
|
|
|
processes. */
|
|
|
|
|
options = __WCLONE | WNOHANG;
|
|
|
|
|
}
|
|
|
|
|
else if (is_lwp (ptid))
|
|
|
|
|
{
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: Waiting for specific LWP %s.\n",
|
|
|
|
|
target_pid_to_str (ptid));
|
|
|
|
|
|
|
|
|
|
/* We have a specific LWP to check. */
|
|
|
|
|
lp = find_lwp_pid (ptid);
|
|
|
|
|
gdb_assert (lp);
|
|
|
|
|
status = lp->status;
|
|
|
|
|
lp->status = 0;
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat && status)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: Using pending wait status %s for %s.\n",
|
|
|
|
|
status_to_str (status),
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
|
|
|
|
|
/* If we have to wait, take into account whether PID is a cloned
|
|
|
|
|
process or not. And we have to convert it to something that
|
|
|
|
|
the layer beneath us can understand. */
|
|
|
|
|
options = lp->cloned ? __WCLONE : 0;
|
|
|
|
|
pid = GET_LWP (ptid);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (status && lp->signalled)
|
|
|
|
|
{
|
|
|
|
|
/* A pending SIGSTOP may interfere with the normal stream of
|
|
|
|
|
events. In a typical case where interference is a problem,
|
|
|
|
|
we have a SIGSTOP signal pending for LWP A while
|
|
|
|
|
single-stepping it, encounter an event in LWP B, and take the
|
|
|
|
|
pending SIGSTOP while trying to stop LWP A. After processing
|
|
|
|
|
the event in LWP B, LWP A is continued, and we'll never see
|
|
|
|
|
the SIGTRAP associated with the last time we were
|
|
|
|
|
single-stepping LWP A. */
|
|
|
|
|
|
|
|
|
|
/* Resume the thread. It should halt immediately returning the
|
|
|
|
|
pending SIGSTOP. */
|
|
|
|
|
registers_changed ();
|
|
|
|
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step,
|
|
|
|
|
TARGET_SIGNAL_0);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
|
|
|
|
|
lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
lp->stopped = 0;
|
|
|
|
|
gdb_assert (lp->resumed);
|
|
|
|
|
|
|
|
|
|
/* This should catch the pending SIGSTOP. */
|
|
|
|
|
stop_wait_callback (lp, NULL);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
set_sigint_trap (); /* Causes SIGINT to be passed on to the
|
|
|
|
|
attached process. */
|
|
|
|
|
set_sigio_trap ();
|
|
|
|
|
|
|
|
|
|
while (status == 0)
|
|
|
|
|
{
|
|
|
|
|
pid_t lwpid;
|
|
|
|
|
|
|
|
|
|
lwpid = waitpid (pid, &status, options);
|
|
|
|
|
if (lwpid > 0)
|
|
|
|
|
{
|
|
|
|
|
gdb_assert (pid == -1 || lwpid == pid);
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: waitpid %ld received %s\n",
|
|
|
|
|
(long) lwpid, status_to_str (status));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
lp = find_lwp_pid (pid_to_ptid (lwpid));
|
|
|
|
|
|
|
|
|
|
/* Check for stop events reported by a process we didn't
|
|
|
|
|
already know about - anything not already in our LWP
|
|
|
|
|
list.
|
|
|
|
|
|
|
|
|
|
If we're expecting to receive stopped processes after
|
|
|
|
|
fork, vfork, and clone events, then we'll just add the
|
|
|
|
|
new one to our list and go back to waiting for the event
|
|
|
|
|
to be reported - the stopped process might be returned
|
|
|
|
|
from waitpid before or after the event is. */
|
|
|
|
|
if (WIFSTOPPED (status) && !lp)
|
|
|
|
|
{
|
|
|
|
|
linux_record_stopped_pid (lwpid);
|
|
|
|
|
status = 0;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Make sure we don't report an event for the exit of an LWP not in
|
|
|
|
|
our list, i.e. not part of the current process. This can happen
|
|
|
|
|
if we detach from a program we original forked and then it
|
|
|
|
|
exits. */
|
|
|
|
|
if (!WIFSTOPPED (status) && !lp)
|
|
|
|
|
{
|
|
|
|
|
status = 0;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* NOTE drow/2003-06-17: This code seems to be meant for debugging
|
|
|
|
|
CLONE_PTRACE processes which do not use the thread library -
|
|
|
|
|
otherwise we wouldn't find the new LWP this way. That doesn't
|
|
|
|
|
currently work, and the following code is currently unreachable
|
|
|
|
|
due to the two blocks above. If it's fixed some day, this code
|
|
|
|
|
should be broken out into a function so that we can also pick up
|
|
|
|
|
LWPs from the new interface. */
|
|
|
|
|
if (!lp)
|
|
|
|
|
{
|
|
|
|
|
lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid)));
|
|
|
|
|
if (options & __WCLONE)
|
|
|
|
|
lp->cloned = 1;
|
|
|
|
|
|
|
|
|
|
if (threaded)
|
|
|
|
|
{
|
|
|
|
|
gdb_assert (WIFSTOPPED (status)
|
|
|
|
|
&& WSTOPSIG (status) == SIGSTOP);
|
|
|
|
|
lp->signalled = 1;
|
|
|
|
|
|
|
|
|
|
if (!in_thread_list (inferior_ptid))
|
|
|
|
|
{
|
|
|
|
|
inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
|
|
|
|
|
GET_PID (inferior_ptid));
|
|
|
|
|
add_thread (inferior_ptid);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
add_thread (lp->ptid);
|
|
|
|
|
printf_unfiltered ("[New %s]\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Handle GNU/Linux's extended waitstatus for trace events. */
|
|
|
|
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
|
|
|
|
|
{
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: Handling extended status 0x%06x\n",
|
|
|
|
|
status);
|
|
|
|
|
if (linux_nat_handle_extended (lp, status))
|
|
|
|
|
{
|
|
|
|
|
status = 0;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Check if the thread has exited. */
|
|
|
|
|
if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1)
|
|
|
|
|
{
|
|
|
|
|
if (in_thread_list (lp->ptid))
|
|
|
|
|
{
|
|
|
|
|
/* Core GDB cannot deal with us deleting the current
|
|
|
|
|
thread. */
|
|
|
|
|
if (!ptid_equal (lp->ptid, inferior_ptid))
|
|
|
|
|
delete_thread (lp->ptid);
|
|
|
|
|
printf_unfiltered ("[%s exited]\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* If this is the main thread, we must stop all threads and
|
|
|
|
|
verify if they are still alive. This is because in the nptl
|
|
|
|
|
thread model, there is no signal issued for exiting LWPs
|
|
|
|
|
other than the main thread. We only get the main thread
|
|
|
|
|
exit signal once all child threads have already exited.
|
|
|
|
|
If we stop all the threads and use the stop_wait_callback
|
|
|
|
|
to check if they have exited we can determine whether this
|
|
|
|
|
signal should be ignored or whether it means the end of the
|
|
|
|
|
debugged application, regardless of which threading model
|
|
|
|
|
is being used. */
|
|
|
|
|
if (GET_PID (lp->ptid) == GET_LWP (lp->ptid))
|
|
|
|
|
{
|
|
|
|
|
lp->stopped = 1;
|
|
|
|
|
iterate_over_lwps (stop_and_resume_callback, NULL);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: %s exited.\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
|
|
|
|
|
delete_lwp (lp->ptid);
|
|
|
|
|
|
|
|
|
|
/* If there is at least one more LWP, then the exit signal
|
|
|
|
|
was not the end of the debugged application and should be
|
|
|
|
|
ignored. */
|
|
|
|
|
if (num_lwps > 0)
|
|
|
|
|
{
|
|
|
|
|
/* Make sure there is at least one thread running. */
|
|
|
|
|
gdb_assert (iterate_over_lwps (running_callback, NULL));
|
|
|
|
|
|
|
|
|
|
/* Discard the event. */
|
|
|
|
|
status = 0;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Check if the current LWP has previously exited. In the nptl
|
|
|
|
|
thread model, LWPs other than the main thread do not issue
|
|
|
|
|
signals when they exit so we must check whenever the thread
|
|
|
|
|
has stopped. A similar check is made in stop_wait_callback(). */
|
|
|
|
|
if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid))
|
|
|
|
|
{
|
|
|
|
|
if (in_thread_list (lp->ptid))
|
|
|
|
|
{
|
|
|
|
|
/* Core GDB cannot deal with us deleting the current
|
|
|
|
|
thread. */
|
|
|
|
|
if (!ptid_equal (lp->ptid, inferior_ptid))
|
|
|
|
|
delete_thread (lp->ptid);
|
|
|
|
|
printf_unfiltered ("[%s exited]\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: %s exited.\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
|
|
|
|
|
delete_lwp (lp->ptid);
|
|
|
|
|
|
|
|
|
|
/* Make sure there is at least one thread running. */
|
|
|
|
|
gdb_assert (iterate_over_lwps (running_callback, NULL));
|
|
|
|
|
|
|
|
|
|
/* Discard the event. */
|
|
|
|
|
status = 0;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Make sure we don't report a SIGSTOP that we sent
|
|
|
|
|
ourselves in an attempt to stop an LWP. */
|
|
|
|
|
if (lp->signalled
|
|
|
|
|
&& WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP)
|
|
|
|
|
{
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: Delayed SIGSTOP caught for %s.\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
|
|
|
|
|
/* This is a delayed SIGSTOP. */
|
|
|
|
|
lp->signalled = 0;
|
|
|
|
|
|
|
|
|
|
registers_changed ();
|
|
|
|
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step,
|
|
|
|
|
TARGET_SIGNAL_0);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
|
|
|
|
|
lp->step ?
|
|
|
|
|
"PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
|
|
|
|
|
lp->stopped = 0;
|
|
|
|
|
gdb_assert (lp->resumed);
|
|
|
|
|
|
|
|
|
|
/* Discard the event. */
|
|
|
|
|
status = 0;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (pid == -1)
|
|
|
|
|
{
|
|
|
|
|
/* Alternate between checking cloned and uncloned processes. */
|
|
|
|
|
options ^= __WCLONE;
|
|
|
|
|
|
|
|
|
|
/* And suspend every time we have checked both. */
|
|
|
|
|
if (options & __WCLONE)
|
|
|
|
|
sigsuspend (&suspend_mask);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* We shouldn't end up here unless we want to try again. */
|
|
|
|
|
gdb_assert (status == 0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
clear_sigio_trap ();
|
|
|
|
|
clear_sigint_trap ();
|
|
|
|
|
|
|
|
|
|
gdb_assert (lp);
|
|
|
|
|
|
|
|
|
|
/* Don't report signals that GDB isn't interested in, such as
|
|
|
|
|
signals that are neither printed nor stopped upon. Stopping all
|
|
|
|
|
threads can be a bit time-consuming so if we want decent
|
|
|
|
|
performance with heavily multi-threaded programs, especially when
|
|
|
|
|
they're using a high frequency timer, we'd better avoid it if we
|
|
|
|
|
can. */
|
|
|
|
|
|
|
|
|
|
if (WIFSTOPPED (status))
|
|
|
|
|
{
|
|
|
|
|
int signo = target_signal_from_host (WSTOPSIG (status));
|
|
|
|
|
|
|
|
|
|
if (signal_stop_state (signo) == 0
|
|
|
|
|
&& signal_print_state (signo) == 0
|
|
|
|
|
&& signal_pass_state (signo) == 1)
|
|
|
|
|
{
|
|
|
|
|
/* FIMXE: kettenis/2001-06-06: Should we resume all threads
|
|
|
|
|
here? It is not clear we should. GDB may not expect
|
|
|
|
|
other threads to run. On the other hand, not resuming
|
|
|
|
|
newly attached threads may cause an unwanted delay in
|
|
|
|
|
getting them running. */
|
|
|
|
|
registers_changed ();
|
|
|
|
|
child_resume (pid_to_ptid (GET_LWP (lp->ptid)), lp->step, signo);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: %s %s, %s (preempt 'handle')\n",
|
|
|
|
|
lp->step ?
|
|
|
|
|
"PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
signo ? strsignal (signo) : "0");
|
|
|
|
|
lp->stopped = 0;
|
|
|
|
|
status = 0;
|
|
|
|
|
goto retry;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0)
|
|
|
|
|
{
|
|
|
|
|
/* If ^C/BREAK is typed at the tty/console, SIGINT gets
|
|
|
|
|
forwarded to the entire process group, that is, all LWP's
|
|
|
|
|
will receive it. Since we only want to report it once,
|
|
|
|
|
we try to flush it from all LWPs except this one. */
|
|
|
|
|
sigaddset (&flush_mask, SIGINT);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* This LWP is stopped now. */
|
|
|
|
|
lp->stopped = 1;
|
|
|
|
|
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n",
|
|
|
|
|
status_to_str (status), target_pid_to_str (lp->ptid));
|
|
|
|
|
|
|
|
|
|
/* Now stop all other LWP's ... */
|
|
|
|
|
iterate_over_lwps (stop_callback, NULL);
|
|
|
|
|
|
|
|
|
|
/* ... and wait until all of them have reported back that they're no
|
|
|
|
|
longer running. */
|
|
|
|
|
iterate_over_lwps (stop_wait_callback, &flush_mask);
|
|
|
|
|
iterate_over_lwps (flush_callback, &flush_mask);
|
|
|
|
|
|
|
|
|
|
/* If we're not waiting for a specific LWP, choose an event LWP from
|
|
|
|
|
among those that have had events. Giving equal priority to all
|
|
|
|
|
LWPs that have had events helps prevent starvation. */
|
|
|
|
|
if (pid == -1)
|
|
|
|
|
select_event_lwp (&lp, &status);
|
|
|
|
|
|
|
|
|
|
/* Now that we've selected our final event LWP, cancel any
|
|
|
|
|
breakpoints in other LWPs that have hit a GDB breakpoint. See
|
|
|
|
|
the comment in cancel_breakpoints_callback to find out why. */
|
|
|
|
|
iterate_over_lwps (cancel_breakpoints_callback, lp);
|
|
|
|
|
|
|
|
|
|
/* If we're not running in "threaded" mode, we'll report the bare
|
|
|
|
|
process id. */
|
|
|
|
|
|
|
|
|
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
|
|
|
|
|
{
|
|
|
|
|
trap_ptid = (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLW: trap_ptid is %s.\n",
|
|
|
|
|
target_pid_to_str (trap_ptid));
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
trap_ptid = null_ptid;
|
|
|
|
|
|
|
|
|
|
if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE)
|
|
|
|
|
{
|
|
|
|
|
*ourstatus = lp->waitstatus;
|
|
|
|
|
lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
store_waitstatus (ourstatus, status);
|
|
|
|
|
|
|
|
|
|
return (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
kill_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
errno = 0;
|
|
|
|
|
ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"KC: PTRACE_KILL %s, 0, 0 (%s)\n",
|
|
|
|
|
target_pid_to_str (lp->ptid),
|
|
|
|
|
errno ? safe_strerror (errno) : "OK");
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
kill_wait_callback (struct lwp_info *lp, void *data)
|
|
|
|
|
{
|
|
|
|
|
pid_t pid;
|
|
|
|
|
|
|
|
|
|
/* We must make sure that there are no pending events (delayed
|
|
|
|
|
SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
|
|
|
|
|
program doesn't interfere with any following debugging session. */
|
|
|
|
|
|
|
|
|
|
/* For cloned processes we must check both with __WCLONE and
|
|
|
|
|
without, since the exit status of a cloned process isn't reported
|
|
|
|
|
with __WCLONE. */
|
|
|
|
|
if (lp->cloned)
|
|
|
|
|
{
|
|
|
|
|
do
|
|
|
|
|
{
|
|
|
|
|
pid = waitpid (GET_LWP (lp->ptid), NULL, __WCLONE);
|
|
|
|
|
if (pid != (pid_t) -1 && debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"KWC: wait %s received unknown.\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
while (pid == GET_LWP (lp->ptid));
|
|
|
|
|
|
|
|
|
|
gdb_assert (pid == -1 && errno == ECHILD);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
do
|
|
|
|
|
{
|
|
|
|
|
pid = waitpid (GET_LWP (lp->ptid), NULL, 0);
|
|
|
|
|
if (pid != (pid_t) -1 && debug_linux_nat)
|
|
|
|
|
{
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"KWC: wait %s received unk.\n",
|
|
|
|
|
target_pid_to_str (lp->ptid));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
while (pid == GET_LWP (lp->ptid));
|
|
|
|
|
|
|
|
|
|
gdb_assert (pid == -1 && errno == ECHILD);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
linux_nat_kill (void)
|
|
|
|
|
{
|
|
|
|
|
/* Kill all LWP's ... */
|
|
|
|
|
iterate_over_lwps (kill_callback, NULL);
|
|
|
|
|
|
|
|
|
|
/* ... and wait until we've flushed all events. */
|
|
|
|
|
iterate_over_lwps (kill_wait_callback, NULL);
|
|
|
|
|
|
|
|
|
|
target_mourn_inferior ();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
linux_nat_create_inferior (char *exec_file, char *allargs, char **env,
|
|
|
|
|
int from_tty)
|
|
|
|
|
{
|
|
|
|
|
child_ops.to_create_inferior (exec_file, allargs, env, from_tty);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
linux_nat_mourn_inferior (void)
|
|
|
|
|
{
|
|
|
|
|
trap_ptid = null_ptid;
|
|
|
|
|
|
|
|
|
|
/* Destroy LWP info; it's no longer valid. */
|
|
|
|
|
init_lwp_list ();
|
|
|
|
|
|
|
|
|
|
/* Restore the original signal mask. */
|
|
|
|
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
|
|
|
|
sigemptyset (&blocked_mask);
|
|
|
|
|
|
|
|
|
|
child_ops.to_mourn_inferior ();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
linux_nat_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
|
|
|
|
|
struct mem_attrib *attrib, struct target_ops *target)
|
|
|
|
|
{
|
|
|
|
|
struct cleanup *old_chain = save_inferior_ptid ();
|
|
|
|
|
int xfer;
|
|
|
|
|
|
|
|
|
|
if (is_lwp (inferior_ptid))
|
|
|
|
|
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
|
|
|
|
|
|
|
|
|
|
xfer = linux_proc_xfer_memory (memaddr, myaddr, len, write, attrib, target);
|
|
|
|
|
if (xfer == 0)
|
|
|
|
|
xfer = child_xfer_memory (memaddr, myaddr, len, write, attrib, target);
|
|
|
|
|
|
|
|
|
|
do_cleanups (old_chain);
|
|
|
|
|
return xfer;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
linux_nat_thread_alive (ptid_t ptid)
|
|
|
|
|
{
|
|
|
|
|
gdb_assert (is_lwp (ptid));
|
|
|
|
|
|
|
|
|
|
errno = 0;
|
|
|
|
|
ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0);
|
|
|
|
|
if (debug_linux_nat)
|
|
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
|
|
|
"LLTA: PTRACE_PEEKUSER %s, 0, 0 (%s)\n",
|
|
|
|
|
target_pid_to_str (ptid),
|
|
|
|
|
errno ? safe_strerror (errno) : "OK");
|
|
|
|
|
if (errno)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static char *
|
|
|
|
|
linux_nat_pid_to_str (ptid_t ptid)
|
|
|
|
|
{
|
|
|
|
|
static char buf[64];
|
|
|
|
|
|
|
|
|
|
if (is_lwp (ptid))
|
|
|
|
|
{
|
|
|
|
|
snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid));
|
|
|
|
|
return buf;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return normal_pid_to_str (ptid);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
init_linux_nat_ops (void)
|
|
|
|
|
{
|
|
|
|
|
#if 0
|
|
|
|
|
linux_nat_ops.to_open = linux_nat_open;
|
|
|
|
|
#endif
|
|
|
|
|
linux_nat_ops.to_shortname = "lwp-layer";
|
|
|
|
|
linux_nat_ops.to_longname = "lwp-layer";
|
|
|
|
|
linux_nat_ops.to_doc = "Low level threads support (LWP layer)";
|
|
|
|
|
linux_nat_ops.to_attach = linux_nat_attach;
|
|
|
|
|
linux_nat_ops.to_detach = linux_nat_detach;
|
|
|
|
|
linux_nat_ops.to_resume = linux_nat_resume;
|
|
|
|
|
linux_nat_ops.to_wait = linux_nat_wait;
|
|
|
|
|
/* fetch_inferior_registers and store_inferior_registers will
|
|
|
|
|
honor the LWP id, so we can use them directly. */
|
|
|
|
|
linux_nat_ops.to_fetch_registers = fetch_inferior_registers;
|
|
|
|
|
linux_nat_ops.to_store_registers = store_inferior_registers;
|
|
|
|
|
linux_nat_ops.to_xfer_memory = linux_nat_xfer_memory;
|
|
|
|
|
linux_nat_ops.to_kill = linux_nat_kill;
|
|
|
|
|
linux_nat_ops.to_create_inferior = linux_nat_create_inferior;
|
|
|
|
|
linux_nat_ops.to_mourn_inferior = linux_nat_mourn_inferior;
|
|
|
|
|
linux_nat_ops.to_thread_alive = linux_nat_thread_alive;
|
|
|
|
|
linux_nat_ops.to_pid_to_str = linux_nat_pid_to_str;
|
|
|
|
|
linux_nat_ops.to_post_startup_inferior = child_post_startup_inferior;
|
|
|
|
|
linux_nat_ops.to_post_attach = child_post_attach;
|
|
|
|
|
linux_nat_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint;
|
|
|
|
|
linux_nat_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint;
|
|
|
|
|
linux_nat_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint;
|
|
|
|
|
|
|
|
|
|
linux_nat_ops.to_stratum = thread_stratum;
|
|
|
|
|
linux_nat_ops.to_has_thread_control = tc_schedlock;
|
|
|
|
|
linux_nat_ops.to_magic = OPS_MAGIC;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
sigchld_handler (int signo)
|
|
|
|
|
{
|
|
|
|
|
/* Do nothing. The only reason for this handler is that it allows
|
|
|
|
|
us to use sigsuspend in linux_nat_wait above to wait for the
|
|
|
|
|
arrival of a SIGCHLD. */
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
_initialize_linux_nat (void)
|
|
|
|
|
{
|
|
|
|
|
struct sigaction action;
|
|
|
|
|
|
|
|
|
|
extern void thread_db_init (struct target_ops *);
|
|
|
|
|
|
|
|
|
|
init_linux_nat_ops ();
|
|
|
|
|
add_target (&linux_nat_ops);
|
|
|
|
|
thread_db_init (&linux_nat_ops);
|
|
|
|
|
|
|
|
|
|
/* Save the original signal mask. */
|
|
|
|
|
sigprocmask (SIG_SETMASK, NULL, &normal_mask);
|
|
|
|
|
|
|
|
|
|
action.sa_handler = sigchld_handler;
|
|
|
|
|
sigemptyset (&action.sa_mask);
|
|
|
|
|
action.sa_flags = 0;
|
|
|
|
|
sigaction (SIGCHLD, &action, NULL);
|
|
|
|
|
|
|
|
|
|
/* Make sure we don't block SIGCHLD during a sigsuspend. */
|
|
|
|
|
sigprocmask (SIG_SETMASK, NULL, &suspend_mask);
|
|
|
|
|
sigdelset (&suspend_mask, SIGCHLD);
|
|
|
|
|
|
|
|
|
|
sigemptyset (&blocked_mask);
|
|
|
|
|
|
|
|
|
|
deprecated_add_show_from_set
|
|
|
|
|
(add_set_cmd ("lin-lwp", no_class, var_zinteger,
|
|
|
|
|
(char *) &debug_linux_nat,
|
|
|
|
|
"Set debugging of GNU/Linux lwp module.\n\
|
|
|
|
|
Enables printf debugging output.\n", &setdebuglist), &showdebuglist);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
|
|
|
|
|
the GNU/Linux Threads library and therefore doesn't really belong
|
|
|
|
|
here. */
|
|
|
|
|
|
|
|
|
|
/* Read variable NAME in the target and return its value if found.
|
|
|
|
|
Otherwise return zero. It is assumed that the type of the variable
|
|
|
|
|
is `int'. */
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
get_signo (const char *name)
|
|
|
|
|
{
|
|
|
|
|
struct minimal_symbol *ms;
|
|
|
|
|
int signo;
|
|
|
|
|
|
|
|
|
|
ms = lookup_minimal_symbol (name, NULL, NULL);
|
|
|
|
|
if (ms == NULL)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (char *) &signo,
|
|
|
|
|
sizeof (signo)) != 0)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
return signo;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Return the set of signals used by the threads library in *SET. */
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
lin_thread_get_thread_signals (sigset_t *set)
|
|
|
|
|
{
|
|
|
|
|
struct sigaction action;
|
|
|
|
|
int restart, cancel;
|
|
|
|
|
|
|
|
|
|
sigemptyset (set);
|
|
|
|
|
|
|
|
|
|
restart = get_signo ("__pthread_sig_restart");
|
|
|
|
|
if (restart == 0)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
cancel = get_signo ("__pthread_sig_cancel");
|
|
|
|
|
if (cancel == 0)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
sigaddset (set, restart);
|
|
|
|
|
sigaddset (set, cancel);
|
|
|
|
|
|
|
|
|
|
/* The GNU/Linux Threads library makes terminating threads send a
|
|
|
|
|
special "cancel" signal instead of SIGCHLD. Make sure we catch
|
|
|
|
|
those (to prevent them from terminating GDB itself, which is
|
|
|
|
|
likely to be their default action) and treat them the same way as
|
|
|
|
|
SIGCHLD. */
|
|
|
|
|
|
|
|
|
|
action.sa_handler = sigchld_handler;
|
|
|
|
|
sigemptyset (&action.sa_mask);
|
|
|
|
|
action.sa_flags = 0;
|
|
|
|
|
sigaction (cancel, &action, NULL);
|
|
|
|
|
|
|
|
|
|
/* We block the "cancel" signal throughout this code ... */
|
|
|
|
|
sigaddset (&blocked_mask, cancel);
|
|
|
|
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
|
|
|
|
|
|
|
|
|
/* ... except during a sigsuspend. */
|
|
|
|
|
sigdelset (&suspend_mask, cancel);
|
|
|
|
|
}
|