130 lines
3.4 KiB
C++
130 lines
3.4 KiB
C++
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/* Fork a Unix child process, and set up to debug it, for GDBserver.
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Copyright (C) 1989-2022 Free Software Foundation, Inc.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "gdbsupport/job-control.h"
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#include "gdbsupport/scoped_restore.h"
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#include "nat/fork-inferior.h"
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#ifdef HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#ifdef SIGTTOU
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/* A file descriptor for the controlling terminal. */
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static int terminal_fd;
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/* TERMINAL_FD's original foreground group. */
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static pid_t old_foreground_pgrp;
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/* Hand back terminal ownership to the original foreground group. */
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static void
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restore_old_foreground_pgrp (void)
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{
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tcsetpgrp (terminal_fd, old_foreground_pgrp);
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}
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#endif
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/* See nat/fork-inferior.h. */
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void
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prefork_hook (const char *args)
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{
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client_state &cs = get_client_state ();
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threads_debug_printf ("args: %s", args);
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#ifdef SIGTTOU
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signal (SIGTTOU, SIG_DFL);
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signal (SIGTTIN, SIG_DFL);
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#endif
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/* Clear this so the backend doesn't get confused, thinking
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CONT_THREAD died, and it needs to resume all threads. */
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cs.cont_thread = null_ptid;
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}
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/* See nat/fork-inferior.h. */
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void
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postfork_hook (pid_t pid)
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{
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}
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/* See nat/fork-inferior.h. */
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void
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postfork_child_hook ()
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{
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/* This is set to the result of setpgrp, which if vforked, will be
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visible to you in the parent process. It's only used by humans
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for debugging. */
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static int debug_setpgrp = 657473;
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debug_setpgrp = gdb_setpgid ();
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if (debug_setpgrp == -1)
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perror (_("setpgrp failed in child"));
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}
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/* See nat/fork-inferior.h. */
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void
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gdb_flush_out_err ()
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{
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fflush (stdout);
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fflush (stderr);
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}
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/* See server.h. */
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void
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post_fork_inferior (int pid, const char *program)
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{
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client_state &cs = get_client_state ();
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#ifdef SIGTTOU
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signal (SIGTTOU, SIG_IGN);
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signal (SIGTTIN, SIG_IGN);
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terminal_fd = fileno (stderr);
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old_foreground_pgrp = tcgetpgrp (terminal_fd);
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tcsetpgrp (terminal_fd, pid);
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atexit (restore_old_foreground_pgrp);
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#endif
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process_info *proc = find_process_pid (pid);
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/* If the inferior fails to start, startup_inferior mourns the
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process (which deletes it), and then throws an error. This means
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that on exception return, we don't need or want to clear this
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flag back, as PROC won't exist anymore. Thus, we don't use a
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scoped_restore. */
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proc->starting_up = true;
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startup_inferior (the_target, pid,
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START_INFERIOR_TRAPS_EXPECTED,
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&cs.last_status, &cs.last_ptid);
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/* If we get here, the process was successfully started. */
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proc->starting_up = false;
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current_thread->last_resume_kind = resume_stop;
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current_thread->last_status = cs.last_status;
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signal_pid = pid;
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target_post_create_inferior ();
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fprintf (stderr, "Process %s created; pid = %d\n", program, pid);
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fflush (stderr);
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}
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