| /* Fork a Unix child process, and set up to debug it, for GDBserver. |
| Copyright (C) 1989-2024 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 "gdbsupport/job-control.h" |
| #include "gdbsupport/scoped_restore.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 (); |
| threads_debug_printf ("args: %s", args); |
| |
| #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 |
| |
| process_info *proc = find_process_pid (pid); |
| |
| /* If the inferior fails to start, startup_inferior mourns the |
| process (which deletes it), and then throws an error. This means |
| that on exception return, we don't need or want to clear this |
| flag back, as PROC won't exist anymore. Thus, we don't use a |
| scoped_restore. */ |
| proc->starting_up = true; |
| |
| startup_inferior (the_target, pid, |
| START_INFERIOR_TRAPS_EXPECTED, |
| &cs.last_status, &cs.last_ptid); |
| |
| /* If we get here, the process was successfully started. */ |
| proc->starting_up = false; |
| |
| 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); |
| } |