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/* Fork a Unix child process, and set up to debug it, for GDBserver.
Copyright (C) 1989-2021 Free Software Foundation, Inc.
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 3 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, see <http://www.gnu.org/licenses/>. */
#include "server.h"
#include "gdbsupport/job-control.h"
#include "nat/fork-inferior.h"
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef SIGTTOU
/* A file descriptor for the controlling terminal. */
static int terminal_fd;
/* TERMINAL_FD's original foreground group. */
static pid_t old_foreground_pgrp;
/* Hand back terminal ownership to the original foreground group. */
static void
restore_old_foreground_pgrp (void)
{
tcsetpgrp (terminal_fd, old_foreground_pgrp);
}
#endif
/* See nat/fork-inferior.h. */
void
prefork_hook (const char *args)
{
client_state &cs = get_client_state ();
if (debug_threads)
{
debug_printf ("args: %s\n", args);
debug_flush ();
}
#ifdef SIGTTOU
signal (SIGTTOU, SIG_DFL);
signal (SIGTTIN, SIG_DFL);
#endif
/* Clear this so the backend doesn't get confused, thinking
CONT_THREAD died, and it needs to resume all threads. */
cs.cont_thread = null_ptid;
}
/* See nat/fork-inferior.h. */
void
postfork_hook (pid_t pid)
{
}
/* See nat/fork-inferior.h. */
void
postfork_child_hook ()
{
/* This is set to the result of setpgrp, which if vforked, will be
visible to you in the parent process. It's only used by humans
for debugging. */
static int debug_setpgrp = 657473;
debug_setpgrp = gdb_setpgid ();
if (debug_setpgrp == -1)
perror (_("setpgrp failed in child"));
}
/* See nat/fork-inferior.h. */
void
gdb_flush_out_err ()
{
fflush (stdout);
fflush (stderr);
}
/* See server.h. */
void
post_fork_inferior (int pid, const char *program)
{
client_state &cs = get_client_state ();
#ifdef SIGTTOU
signal (SIGTTOU, SIG_IGN);
signal (SIGTTIN, SIG_IGN);
terminal_fd = fileno (stderr);
old_foreground_pgrp = tcgetpgrp (terminal_fd);
tcsetpgrp (terminal_fd, pid);
atexit (restore_old_foreground_pgrp);
#endif
startup_inferior (the_target, pid,
START_INFERIOR_TRAPS_EXPECTED,
&cs.last_status, &cs.last_ptid);
current_thread->last_resume_kind = resume_stop;
current_thread->last_status = cs.last_status;
signal_pid = pid;
target_post_create_inferior ();
fprintf (stderr, "Process %s created; pid = %d\n", program, pid);
fflush (stderr);
}
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