1 /* Fork a Unix child process, and set up to debug it, for GDBserver.
2 Copyright (C) 1989-2017 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "job-control.h"
21 #include "nat/fork-inferior.h"
24 /* A file descriptor for the controlling terminal. */
25 static int terminal_fd;
27 /* TERMINAL_FD's original foreground group. */
28 static pid_t old_foreground_pgrp;
30 /* Hand back terminal ownership to the original foreground group. */
33 restore_old_foreground_pgrp (void)
35 tcsetpgrp (terminal_fd, old_foreground_pgrp);
39 /* See nat/fork-inferior.h. */
42 prefork_hook (const char *args)
46 debug_printf ("args: %s\n", args);
51 signal (SIGTTOU, SIG_DFL);
52 signal (SIGTTIN, SIG_DFL);
55 /* Clear this so the backend doesn't get confused, thinking
56 CONT_THREAD died, and it needs to resume all threads. */
57 cont_thread = null_ptid;
60 /* See nat/fork-inferior.h. */
63 postfork_hook (pid_t pid)
67 /* See nat/fork-inferior.h. */
70 postfork_child_hook ()
72 /* This is set to the result of setpgrp, which if vforked, will be
73 visible to you in the parent process. It's only used by humans
75 static int debug_setpgrp = 657473;
77 debug_setpgrp = gdb_setpgid ();
78 if (debug_setpgrp == -1)
79 perror (_("setpgrp failed in child"));
82 /* See nat/fork-inferior.h. */
94 post_fork_inferior (int pid, const char *program)
97 signal (SIGTTOU, SIG_IGN);
98 signal (SIGTTIN, SIG_IGN);
99 terminal_fd = fileno (stderr);
100 old_foreground_pgrp = tcgetpgrp (terminal_fd);
101 tcsetpgrp (terminal_fd, pid);
102 atexit (restore_old_foreground_pgrp);
105 startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED,
106 &last_status, &last_ptid);
107 current_thread->last_resume_kind = resume_stop;
108 current_thread->last_status = last_status;
110 target_post_create_inferior ();
111 fprintf (stderr, "Process %s created; pid = %d\n", program, pid);