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/* Target-vector operations for controlling Unix child processes, for GDB.
Copyright 1990, 1991, 1992, 1993, 1994, 1995
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>
#include <sys/types.h>
#include <fcntl.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 **));
#ifdef NeXT
void
#else
static void
#endif /* NeXT */
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 {
set_sigint_trap(); /* Causes SIGINT to be passed on to the
attached process. */
set_sigio_trap ();
pid = proc_wait (inferior_pid, &status);
save_errno = errno;
clear_sigio_trap ();
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;
#ifdef NeXT
pid = isdigit (*args) ? atoi (args) : -1;
#else
pid = atoi (args);
#endif /* NeXT */
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);
#ifdef CREATE_INFERIOR_HOOK /* NeXT added */
{
struct cleanup *old_chain = make_cleanup(pop_target, &child_ops);
CREATE_INFERIOR_HOOK(args, pid);
discard_cleanups(old_chain);
}
#endif /* CREATE_INFERIOR_HOOK */
}
#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);
}
#ifdef NeXT
void
#else
static void
#endif /* NeXT */
child_mourn_inferior ()
{
unpush_target (&child_ops);
proc_remove_foreign (inferior_pid);
generic_mourn_inferior ();
}
static int
child_can_run ()
{
return(1);
}
/* Send a SIGINT to the process group. This acts just like the user typed a
^C on the controlling terminal.
XXX - This may not be correct for all systems. Some may want to use
killpg() instead of kill (-pgrp). */
void
child_stop ()
{
#ifndef NeXT
extern pid_t inferior_process_group;
#else
extern int inferior_process_group;
#endif /* NeXT */
kill (-inferior_process_group, SIGINT);
}
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 */
child_stop, /* to_stop */
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, /* to_sections */
0, /* to_sections_end */
OPS_MAGIC /* to_magic */
};
void
_initialize_inftarg ()
{
#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 ());
if ((fd = open (procname, O_RDONLY)) >= 0)
{
close (fd);
return;
}
#endif
add_target (&child_ops);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.