328 lines
8.2 KiB
C
328 lines
8.2 KiB
C
/* Target-vector operations for controlling Unix child processes, for GDB.
|
||
Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
|
||
Contributed by Cygnus Support.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "frame.h" /* required by inferior.h */
|
||
#include "inferior.h"
|
||
#include "target.h"
|
||
#include "wait.h"
|
||
#include "gdbcore.h"
|
||
#include "command.h"
|
||
#include <signal.h>
|
||
|
||
static void
|
||
child_prepare_to_store PARAMS ((void));
|
||
|
||
#ifndef CHILD_WAIT
|
||
static int child_wait PARAMS ((int, struct target_waitstatus *));
|
||
#endif /* CHILD_WAIT */
|
||
|
||
static void child_open PARAMS ((char *, int));
|
||
|
||
static void
|
||
child_files_info PARAMS ((struct target_ops *));
|
||
|
||
static void
|
||
child_detach PARAMS ((char *, int));
|
||
|
||
static void
|
||
child_attach PARAMS ((char *, int));
|
||
|
||
static void
|
||
ptrace_me PARAMS ((void));
|
||
|
||
static void
|
||
ptrace_him PARAMS ((int));
|
||
|
||
static void child_create_inferior PARAMS ((char *, char *, char **));
|
||
|
||
static void
|
||
child_mourn_inferior PARAMS ((void));
|
||
|
||
static int
|
||
child_can_run PARAMS ((void));
|
||
|
||
extern char **environ;
|
||
|
||
/* Forward declaration */
|
||
extern struct target_ops child_ops;
|
||
|
||
#ifndef CHILD_WAIT
|
||
|
||
/* Wait for child to do something. Return pid of child, or -1 in case
|
||
of error; store status through argument pointer OURSTATUS. */
|
||
|
||
static int
|
||
child_wait (pid, ourstatus)
|
||
int pid;
|
||
struct target_waitstatus *ourstatus;
|
||
{
|
||
int save_errno;
|
||
int status;
|
||
|
||
do {
|
||
if (attach_flag)
|
||
set_sigint_trap(); /* Causes SIGINT to be passed on to the
|
||
attached process. */
|
||
set_sigio_trap ();
|
||
|
||
pid = wait (&status);
|
||
save_errno = errno;
|
||
|
||
clear_sigio_trap ();
|
||
|
||
if (attach_flag)
|
||
clear_sigint_trap();
|
||
|
||
if (pid == -1)
|
||
{
|
||
if (save_errno == EINTR)
|
||
continue;
|
||
fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
|
||
safe_strerror (save_errno));
|
||
/* Claim it exited with unknown signal. */
|
||
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
|
||
ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
|
||
return -1;
|
||
}
|
||
} while (pid != inferior_pid); /* Some other child died or stopped */
|
||
store_waitstatus (ourstatus, status);
|
||
return pid;
|
||
}
|
||
#endif /* CHILD_WAIT */
|
||
|
||
/* Attach to process PID, then initialize for debugging it. */
|
||
|
||
static void
|
||
child_attach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
if (!args)
|
||
error_no_arg ("process-id to attach");
|
||
|
||
#ifndef ATTACH_DETACH
|
||
error ("Can't attach to a process on this machine.");
|
||
#else
|
||
{
|
||
char *exec_file;
|
||
int pid;
|
||
|
||
pid = atoi (args);
|
||
|
||
if (pid == getpid()) /* Trying to masturbate? */
|
||
error ("I refuse to debug myself!");
|
||
|
||
if (from_tty)
|
||
{
|
||
exec_file = (char *) get_exec_file (0);
|
||
|
||
if (exec_file)
|
||
printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
|
||
target_pid_to_str (pid));
|
||
else
|
||
printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid));
|
||
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
|
||
attach (pid);
|
||
inferior_pid = pid;
|
||
push_target (&child_ops);
|
||
}
|
||
#endif /* ATTACH_DETACH */
|
||
}
|
||
|
||
|
||
/* Take a program previously attached to and detaches it.
|
||
The program resumes execution and will no longer stop
|
||
on signals, etc. We'd better not have left any breakpoints
|
||
in the program or it'll die when it hits one. For this
|
||
to work, it may be necessary for the process to have been
|
||
previously attached. It *might* work if the program was
|
||
started via the normal ptrace (PTRACE_TRACEME). */
|
||
|
||
static void
|
||
child_detach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
#ifdef ATTACH_DETACH
|
||
{
|
||
int siggnal = 0;
|
||
|
||
if (from_tty)
|
||
{
|
||
char *exec_file = get_exec_file (0);
|
||
if (exec_file == 0)
|
||
exec_file = "";
|
||
printf_unfiltered ("Detaching from program: %s %s\n", exec_file,
|
||
target_pid_to_str (inferior_pid));
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
if (args)
|
||
siggnal = atoi (args);
|
||
|
||
detach (siggnal);
|
||
inferior_pid = 0;
|
||
unpush_target (&child_ops);
|
||
}
|
||
#else
|
||
error ("This version of Unix does not support detaching a process.");
|
||
#endif
|
||
}
|
||
|
||
/* Get ready to modify the registers array. On machines which store
|
||
individual registers, this doesn't need to do anything. On machines
|
||
which store all the registers in one fell swoop, this makes sure
|
||
that registers contains all the registers from the program being
|
||
debugged. */
|
||
|
||
static void
|
||
child_prepare_to_store ()
|
||
{
|
||
#ifdef CHILD_PREPARE_TO_STORE
|
||
CHILD_PREPARE_TO_STORE ();
|
||
#endif
|
||
}
|
||
|
||
/* Print status information about what we're accessing. */
|
||
|
||
static void
|
||
child_files_info (ignore)
|
||
struct target_ops *ignore;
|
||
{
|
||
printf_unfiltered ("\tUsing the running image of %s %s.\n",
|
||
attach_flag? "attached": "child", target_pid_to_str (inferior_pid));
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
child_open (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
error ("Use the \"run\" command to start a Unix child process.");
|
||
}
|
||
|
||
/* Stub function which causes the inferior that runs it, to be ptrace-able
|
||
by its parent process. */
|
||
|
||
static void
|
||
ptrace_me ()
|
||
{
|
||
/* "Trace me, Dr. Memory!" */
|
||
call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0);
|
||
}
|
||
|
||
/* Stub function which causes the GDB that runs it, to start ptrace-ing
|
||
the child process. */
|
||
|
||
static void
|
||
ptrace_him (pid)
|
||
int pid;
|
||
{
|
||
push_target (&child_ops);
|
||
|
||
#ifdef START_INFERIOR_TRAPS_EXPECTED
|
||
startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
|
||
#else
|
||
/* One trap to exec the shell, one to exec the program being debugged. */
|
||
startup_inferior (2);
|
||
#endif
|
||
}
|
||
|
||
/* Start an inferior Unix child process and sets inferior_pid to its pid.
|
||
EXEC_FILE is the file to run.
|
||
ALLARGS is a string containing the arguments to the program.
|
||
ENV is the environment vector to pass. Errors reported with error(). */
|
||
|
||
static void
|
||
child_create_inferior (exec_file, allargs, env)
|
||
char *exec_file;
|
||
char *allargs;
|
||
char **env;
|
||
{
|
||
fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL);
|
||
/* We are at the first instruction we care about. */
|
||
/* Pedal to the metal... */
|
||
proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
|
||
}
|
||
|
||
static void
|
||
child_mourn_inferior ()
|
||
{
|
||
unpush_target (&child_ops);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
static int
|
||
child_can_run ()
|
||
{
|
||
return(1);
|
||
}
|
||
|
||
struct target_ops child_ops = {
|
||
"child", /* to_shortname */
|
||
"Unix child process", /* to_longname */
|
||
"Unix child process (started by the \"run\" command).", /* to_doc */
|
||
child_open, /* to_open */
|
||
0, /* to_close */
|
||
child_attach, /* to_attach */
|
||
child_detach, /* to_detach */
|
||
child_resume, /* to_resume */
|
||
child_wait, /* to_wait */
|
||
fetch_inferior_registers, /* to_fetch_registers */
|
||
store_inferior_registers, /* to_store_registers */
|
||
child_prepare_to_store, /* to_prepare_to_store */
|
||
child_xfer_memory, /* to_xfer_memory */
|
||
child_files_info, /* to_files_info */
|
||
memory_insert_breakpoint, /* to_insert_breakpoint */
|
||
memory_remove_breakpoint, /* to_remove_breakpoint */
|
||
terminal_init_inferior, /* to_terminal_init */
|
||
terminal_inferior, /* to_terminal_inferior */
|
||
terminal_ours_for_output, /* to_terminal_ours_for_output */
|
||
terminal_ours, /* to_terminal_ours */
|
||
child_terminal_info, /* to_terminal_info */
|
||
kill_inferior, /* to_kill */
|
||
0, /* to_load */
|
||
0, /* to_lookup_symbol */
|
||
child_create_inferior, /* to_create_inferior */
|
||
child_mourn_inferior, /* to_mourn_inferior */
|
||
child_can_run, /* to_can_run */
|
||
0, /* to_notice_signals */
|
||
process_stratum, /* to_stratum */
|
||
0, /* to_next */
|
||
1, /* to_has_all_memory */
|
||
1, /* to_has_memory */
|
||
1, /* to_has_stack */
|
||
1, /* to_has_registers */
|
||
1, /* to_has_execution */
|
||
0, /* sections */
|
||
0, /* sections_end */
|
||
OPS_MAGIC /* to_magic */
|
||
};
|
||
|
||
void
|
||
_initialize_inftarg ()
|
||
{
|
||
add_target (&child_ops);
|
||
}
|