661 lines
18 KiB
C
661 lines
18 KiB
C
/* Target-vector operations for controlling Unix child processes, for GDB.
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Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
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2000, 2002, 2003, 2004 Free Software Foundation, Inc.
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Contributed by Cygnus Support.
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## Contains temporary hacks..
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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 "frame.h" /* required by inferior.h */
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#include "inferior.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "command.h"
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#include "gdb_stat.h"
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#include <signal.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include "observer.h"
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#include "gdb_wait.h"
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#include "inflow.h"
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extern struct symtab_and_line *child_enable_exception_callback (enum
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exception_event_kind,
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int);
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extern struct exception_event_record
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*child_get_current_exception_event (void);
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extern void _initialize_inftarg (void);
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static void child_prepare_to_store (void);
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#ifndef CHILD_WAIT
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static ptid_t child_wait (ptid_t, struct target_waitstatus *);
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#endif /* CHILD_WAIT */
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static void child_open (char *, int);
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static void child_files_info (struct target_ops *);
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static void child_detach (char *, int);
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static void child_attach (char *, int);
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#if !defined(CHILD_POST_ATTACH)
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extern void child_post_attach (int);
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#endif
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static void ptrace_me (void);
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static void ptrace_him (int);
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static void child_create_inferior (char *, char *, char **, int);
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static void child_mourn_inferior (void);
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static int child_can_run (void);
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static void child_stop (void);
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#ifndef CHILD_THREAD_ALIVE
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int child_thread_alive (ptid_t);
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#endif
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static void init_child_ops (void);
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extern char **environ;
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int child_suppress_run = 0; /* Non-zero if inftarg should pretend not to
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be a runnable target. Used by targets
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that can sit atop inftarg, such as HPUX
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thread support. */
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#ifndef CHILD_WAIT
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/* Wait for child to do something. Return pid of child, or -1 in case
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of error; store status through argument pointer OURSTATUS. */
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static ptid_t
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child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
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{
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int save_errno;
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int status;
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char *execd_pathname = NULL;
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int exit_status;
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int related_pid;
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int syscall_id;
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enum target_waitkind kind;
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int pid;
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do
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{
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set_sigint_trap (); /* Causes SIGINT to be passed on to the
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attached process. */
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set_sigio_trap ();
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pid = wait (&status);
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save_errno = errno;
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clear_sigio_trap ();
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clear_sigint_trap ();
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if (pid == -1)
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{
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if (save_errno == EINTR)
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continue;
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fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
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safe_strerror (save_errno));
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/* Claim it exited with unknown signal. */
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ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
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ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
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return pid_to_ptid (-1);
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}
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/* Did it exit?
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*/
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if (target_has_exited (pid, status, &exit_status))
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{
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/* ??rehrauer: For now, ignore this. */
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continue;
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}
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if (!target_thread_alive (pid_to_ptid (pid)))
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{
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ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
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return pid_to_ptid (pid);
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}
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} while (pid != PIDGET (inferior_ptid)); /* Some other child died or stopped */
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store_waitstatus (ourstatus, status);
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return pid_to_ptid (pid);
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}
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#endif /* CHILD_WAIT */
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#ifndef CHILD_THREAD_ALIVE
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/* Check to see if the given thread is alive.
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FIXME: Is kill() ever the right way to do this? I doubt it, but
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for now we're going to try and be compatable with the old thread
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code. */
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int
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child_thread_alive (ptid_t ptid)
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{
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pid_t pid = PIDGET (ptid);
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return (kill (pid, 0) != -1);
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}
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#endif
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/* Attach to process PID, then initialize for debugging it. */
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static void
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child_attach (char *args, int from_tty)
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{
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char *exec_file;
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int pid;
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char *dummy;
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if (!args)
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error_no_arg ("process-id to attach");
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dummy = args;
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pid = strtol (args, &dummy, 0);
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/* Some targets don't set errno on errors, grrr! */
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if ((pid == 0) && (args == dummy))
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error ("Illegal process-id: %s\n", args);
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if (pid == getpid ()) /* Trying to masturbate? */
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error ("I refuse to debug myself!");
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if (from_tty)
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{
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exec_file = (char *) get_exec_file (0);
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if (exec_file)
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printf_unfiltered ("Attaching to program: %s, %s\n", exec_file,
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target_pid_to_str (pid_to_ptid (pid)));
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else
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printf_unfiltered ("Attaching to %s\n",
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target_pid_to_str (pid_to_ptid (pid)));
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gdb_flush (gdb_stdout);
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}
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attach (pid);
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inferior_ptid = pid_to_ptid (pid);
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push_target (&deprecated_child_ops);
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}
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#if !defined(CHILD_POST_ATTACH)
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void
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child_post_attach (int pid)
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{
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/* This version of Unix doesn't require a meaningful "post attach"
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operation by a debugger. */
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}
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#endif
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/* Take a program previously attached to and detaches it.
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The program resumes execution and will no longer stop
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on signals, etc. We'd better not have left any breakpoints
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in the program or it'll die when it hits one. For this
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to work, it may be necessary for the process to have been
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previously attached. It *might* work if the program was
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started via the normal ptrace (PTRACE_TRACEME). */
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static void
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child_detach (char *args, int from_tty)
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{
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int siggnal = 0;
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int pid = PIDGET (inferior_ptid);
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if (from_tty)
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{
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char *exec_file = get_exec_file (0);
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if (exec_file == 0)
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exec_file = "";
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printf_unfiltered ("Detaching from program: %s, %s\n", exec_file,
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target_pid_to_str (pid_to_ptid (pid)));
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gdb_flush (gdb_stdout);
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}
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if (args)
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siggnal = atoi (args);
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detach (siggnal);
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inferior_ptid = null_ptid;
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unpush_target (&deprecated_child_ops);
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}
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/* Get ready to modify the registers array. On machines which store
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individual registers, this doesn't need to do anything. On machines
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which store all the registers in one fell swoop, this makes sure
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that registers contains all the registers from the program being
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debugged. */
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static void
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child_prepare_to_store (void)
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{
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#ifdef CHILD_PREPARE_TO_STORE
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CHILD_PREPARE_TO_STORE ();
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#endif
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}
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/* Print status information about what we're accessing. */
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static void
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child_files_info (struct target_ops *ignore)
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{
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printf_unfiltered ("\tUsing the running image of %s %s.\n",
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attach_flag ? "attached" : "child", target_pid_to_str (inferior_ptid));
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}
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static void
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child_open (char *arg, int from_tty)
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{
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error ("Use the \"run\" command to start a Unix child process.");
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}
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/* Stub function which causes the inferior that runs it, to be ptrace-able
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by its parent process. */
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static void
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ptrace_me (void)
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{
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/* "Trace me, Dr. Memory!" */
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call_ptrace (0, 0, (PTRACE_TYPE_ARG3) 0, 0);
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}
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/* Stub function which causes the GDB that runs it, to start ptrace-ing
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the child process. */
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static void
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ptrace_him (int pid)
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{
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push_target (&deprecated_child_ops);
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/* On some targets, there must be some explicit synchronization
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between the parent and child processes after the debugger
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forks, and before the child execs the debuggee program. This
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call basically gives permission for the child to exec.
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*/
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target_acknowledge_created_inferior (pid);
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/* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h,
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* and will be 1 or 2 depending on whether we're starting
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* without or with a shell.
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*/
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startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
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/* On some targets, there must be some explicit actions taken after
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the inferior has been started up.
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*/
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target_post_startup_inferior (pid_to_ptid (pid));
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}
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/* Start an inferior Unix child process and sets inferior_ptid to its pid.
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EXEC_FILE is the file to run.
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ALLARGS is a string containing the arguments to the program.
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ENV is the environment vector to pass. Errors reported with error(). */
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static void
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child_create_inferior (char *exec_file, char *allargs, char **env,
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int from_tty)
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{
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#ifdef HPUXHPPA
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fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, pre_fork_inferior, NULL);
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#else
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fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL);
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#endif
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/* We are at the first instruction we care about. */
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observer_notify_inferior_created (¤t_target, from_tty);
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/* Pedal to the metal... */
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proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
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}
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#if !defined(CHILD_POST_STARTUP_INFERIOR)
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void
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child_post_startup_inferior (ptid_t ptid)
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{
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/* This version of Unix doesn't require a meaningful "post startup inferior"
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operation by a debugger.
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*/
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}
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#endif
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#if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR)
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void
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child_acknowledge_created_inferior (int pid)
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{
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/* This version of Unix doesn't require a meaningful "acknowledge created inferior"
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operation by a debugger.
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*/
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}
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#endif
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#if !defined(CHILD_INSERT_FORK_CATCHPOINT)
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int
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child_insert_fork_catchpoint (int pid)
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{
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/* This version of Unix doesn't support notification of fork events. */
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return 0;
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}
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#endif
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#if !defined(CHILD_REMOVE_FORK_CATCHPOINT)
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int
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child_remove_fork_catchpoint (int pid)
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{
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/* This version of Unix doesn't support notification of fork events. */
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return 0;
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}
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#endif
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#if !defined(CHILD_INSERT_VFORK_CATCHPOINT)
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int
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child_insert_vfork_catchpoint (int pid)
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{
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/* This version of Unix doesn't support notification of vfork events. */
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return 0;
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}
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#endif
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#if !defined(CHILD_REMOVE_VFORK_CATCHPOINT)
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int
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child_remove_vfork_catchpoint (int pid)
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{
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/* This version of Unix doesn't support notification of vfork events. */
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return 0;
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}
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#endif
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#if !defined(CHILD_FOLLOW_FORK)
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int
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child_follow_fork (int follow_child)
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{
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/* This version of Unix doesn't support following fork or vfork events. */
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return 0;
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}
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#endif
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#if !defined(CHILD_INSERT_EXEC_CATCHPOINT)
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int
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child_insert_exec_catchpoint (int pid)
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{
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/* This version of Unix doesn't support notification of exec events. */
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return 0;
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}
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#endif
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#if !defined(CHILD_REMOVE_EXEC_CATCHPOINT)
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int
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child_remove_exec_catchpoint (int pid)
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{
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/* This version of Unix doesn't support notification of exec events. */
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return 0;
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}
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#endif
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#if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL)
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int
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child_reported_exec_events_per_exec_call (void)
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{
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/* This version of Unix doesn't support notification of exec events.
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*/
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return 1;
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}
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#endif
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#if !defined(CHILD_HAS_EXITED)
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int
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child_has_exited (int pid, int wait_status, int *exit_status)
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{
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if (WIFEXITED (wait_status))
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{
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*exit_status = WEXITSTATUS (wait_status);
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return 1;
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}
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if (WIFSIGNALED (wait_status))
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{
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*exit_status = 0; /* ?? Don't know what else to say here. */
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return 1;
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}
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/* ?? Do we really need to consult the event state, too? Assume the
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wait_state alone suffices.
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*/
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return 0;
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}
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#endif
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static void
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child_mourn_inferior (void)
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{
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unpush_target (&deprecated_child_ops);
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generic_mourn_inferior ();
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}
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static int
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child_can_run (void)
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{
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/* This variable is controlled by modules that sit atop inftarg that may layer
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their own process structure atop that provided here. hpux-thread.c does
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this because of the Hpux user-mode level thread model. */
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return !child_suppress_run;
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}
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/* Send a SIGINT to the process group. This acts just like the user typed a
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^C on the controlling terminal.
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XXX - This may not be correct for all systems. Some may want to use
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killpg() instead of kill (-pgrp). */
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static void
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child_stop (void)
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{
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kill (-inferior_process_group, SIGINT);
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}
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#if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK)
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struct symtab_and_line *
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child_enable_exception_callback (enum exception_event_kind kind, int enable)
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{
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return (struct symtab_and_line *) NULL;
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}
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#endif
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#if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT)
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struct exception_event_record *
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child_get_current_exception_event (void)
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{
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return (struct exception_event_record *) NULL;
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}
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#endif
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#if !defined(CHILD_PID_TO_EXEC_FILE)
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char *
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child_pid_to_exec_file (int pid)
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{
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/* This version of Unix doesn't support translation of a process ID
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to the filename of the executable file.
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*/
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return NULL;
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}
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#endif
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char *
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child_core_file_to_sym_file (char *core)
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{
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/* The target stratum for a running executable need not support
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this operation.
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*/
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return NULL;
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}
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/* Perform a partial transfer to/from the specified object. For
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memory transfers, fall back to the old memory xfer functions. */
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static LONGEST
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child_xfer_partial (struct target_ops *ops, enum target_object object,
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const char *annex, void *readbuf,
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const void *writebuf, ULONGEST offset, LONGEST len)
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{
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switch (object)
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{
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case TARGET_OBJECT_MEMORY:
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if (readbuf)
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return child_xfer_memory (offset, readbuf, len, 0/*write*/,
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NULL, ops);
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if (writebuf)
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return child_xfer_memory (offset, (void *) writebuf, len, 1/*write*/,
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NULL, ops);
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return -1;
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case TARGET_OBJECT_UNWIND_TABLE:
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#ifndef NATIVE_XFER_UNWIND_TABLE
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#define NATIVE_XFER_UNWIND_TABLE(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
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#endif
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return NATIVE_XFER_UNWIND_TABLE (ops, object, annex, readbuf, writebuf,
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offset, len);
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case TARGET_OBJECT_AUXV:
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#ifndef NATIVE_XFER_AUXV
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#define NATIVE_XFER_AUXV(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
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#endif
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return NATIVE_XFER_AUXV (ops, object, annex, readbuf, writebuf,
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offset, len);
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case TARGET_OBJECT_WCOOKIE:
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#ifndef NATIVE_XFER_WCOOKIE
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#define NATIVE_XFER_WCOOKIE(OPS,OBJECT,ANNEX,WRITEBUF,READBUF,OFFSET,LEN) (-1)
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|
#endif
|
|
return NATIVE_XFER_WCOOKIE (ops, object, annex, readbuf, writebuf,
|
|
offset, len);
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
#if !defined(CHILD_PID_TO_STR)
|
|
char *
|
|
child_pid_to_str (ptid_t ptid)
|
|
{
|
|
return normal_pid_to_str (ptid);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
init_child_ops (void)
|
|
{
|
|
deprecated_child_ops.to_shortname = "child";
|
|
deprecated_child_ops.to_longname = "Unix child process";
|
|
deprecated_child_ops.to_doc = "Unix child process (started by the \"run\" command).";
|
|
deprecated_child_ops.to_open = child_open;
|
|
deprecated_child_ops.to_attach = child_attach;
|
|
deprecated_child_ops.to_post_attach = child_post_attach;
|
|
deprecated_child_ops.to_detach = child_detach;
|
|
deprecated_child_ops.to_resume = child_resume;
|
|
deprecated_child_ops.to_wait = child_wait;
|
|
deprecated_child_ops.to_fetch_registers = fetch_inferior_registers;
|
|
deprecated_child_ops.to_store_registers = store_inferior_registers;
|
|
deprecated_child_ops.to_prepare_to_store = child_prepare_to_store;
|
|
deprecated_child_ops.deprecated_xfer_memory = child_xfer_memory;
|
|
deprecated_child_ops.to_xfer_partial = child_xfer_partial;
|
|
deprecated_child_ops.to_files_info = child_files_info;
|
|
deprecated_child_ops.to_insert_breakpoint = memory_insert_breakpoint;
|
|
deprecated_child_ops.to_remove_breakpoint = memory_remove_breakpoint;
|
|
deprecated_child_ops.to_terminal_init = terminal_init_inferior;
|
|
deprecated_child_ops.to_terminal_inferior = terminal_inferior;
|
|
deprecated_child_ops.to_terminal_ours_for_output = terminal_ours_for_output;
|
|
deprecated_child_ops.to_terminal_save_ours = terminal_save_ours;
|
|
deprecated_child_ops.to_terminal_ours = terminal_ours;
|
|
deprecated_child_ops.to_terminal_info = child_terminal_info;
|
|
deprecated_child_ops.to_kill = kill_inferior;
|
|
deprecated_child_ops.to_create_inferior = child_create_inferior;
|
|
deprecated_child_ops.to_post_startup_inferior = child_post_startup_inferior;
|
|
deprecated_child_ops.to_acknowledge_created_inferior = child_acknowledge_created_inferior;
|
|
deprecated_child_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint;
|
|
deprecated_child_ops.to_remove_fork_catchpoint = child_remove_fork_catchpoint;
|
|
deprecated_child_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint;
|
|
deprecated_child_ops.to_remove_vfork_catchpoint = child_remove_vfork_catchpoint;
|
|
deprecated_child_ops.to_follow_fork = child_follow_fork;
|
|
deprecated_child_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint;
|
|
deprecated_child_ops.to_remove_exec_catchpoint = child_remove_exec_catchpoint;
|
|
deprecated_child_ops.to_reported_exec_events_per_exec_call = child_reported_exec_events_per_exec_call;
|
|
deprecated_child_ops.to_has_exited = child_has_exited;
|
|
deprecated_child_ops.to_mourn_inferior = child_mourn_inferior;
|
|
deprecated_child_ops.to_can_run = child_can_run;
|
|
deprecated_child_ops.to_thread_alive = child_thread_alive;
|
|
deprecated_child_ops.to_pid_to_str = child_pid_to_str;
|
|
deprecated_child_ops.to_stop = child_stop;
|
|
deprecated_child_ops.to_enable_exception_callback = child_enable_exception_callback;
|
|
deprecated_child_ops.to_get_current_exception_event = child_get_current_exception_event;
|
|
deprecated_child_ops.to_pid_to_exec_file = child_pid_to_exec_file;
|
|
deprecated_child_ops.to_stratum = process_stratum;
|
|
deprecated_child_ops.to_has_all_memory = 1;
|
|
deprecated_child_ops.to_has_memory = 1;
|
|
deprecated_child_ops.to_has_stack = 1;
|
|
deprecated_child_ops.to_has_registers = 1;
|
|
deprecated_child_ops.to_has_execution = 1;
|
|
deprecated_child_ops.to_magic = OPS_MAGIC;
|
|
}
|
|
|
|
void
|
|
_initialize_inftarg (void)
|
|
{
|
|
#ifdef HAVE_OPTIONAL_PROC_FS
|
|
char procname[32];
|
|
int fd;
|
|
|
|
/* If we have an optional /proc filesystem (e.g. under OSF/1),
|
|
don't add ptrace support if we can access the running GDB via /proc. */
|
|
#ifndef PROC_NAME_FMT
|
|
#define PROC_NAME_FMT "/proc/%05d"
|
|
#endif
|
|
sprintf (procname, PROC_NAME_FMT, getpid ());
|
|
fd = open (procname, O_RDONLY);
|
|
if (fd >= 0)
|
|
{
|
|
close (fd);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
init_child_ops ();
|
|
add_target (&deprecated_child_ops);
|
|
}
|