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2090129c | 1 | /* Fork a Unix child process, and set up to debug it, for GDBserver. |
1d506c26 | 2 | Copyright (C) 1989-2024 Free Software Foundation, Inc. |
2090129c SDJ |
3 | |
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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/>. */ | |
18 | ||
268a13a5 | 19 | #include "gdbsupport/job-control.h" |
a9deee17 | 20 | #include "gdbsupport/scoped_restore.h" |
2090129c | 21 | #include "nat/fork-inferior.h" |
9845682b SDJ |
22 | #ifdef HAVE_SIGNAL_H |
23 | #include <signal.h> | |
24 | #endif | |
2090129c SDJ |
25 | |
26 | #ifdef SIGTTOU | |
27 | /* A file descriptor for the controlling terminal. */ | |
28 | static int terminal_fd; | |
29 | ||
30 | /* TERMINAL_FD's original foreground group. */ | |
31 | static pid_t old_foreground_pgrp; | |
32 | ||
33 | /* Hand back terminal ownership to the original foreground group. */ | |
34 | ||
35 | static void | |
36 | restore_old_foreground_pgrp (void) | |
37 | { | |
38 | tcsetpgrp (terminal_fd, old_foreground_pgrp); | |
39 | } | |
40 | #endif | |
41 | ||
42 | /* See nat/fork-inferior.h. */ | |
43 | ||
44 | void | |
45 | prefork_hook (const char *args) | |
46 | { | |
c12a5089 | 47 | client_state &cs = get_client_state (); |
c058728c | 48 | threads_debug_printf ("args: %s", args); |
2090129c SDJ |
49 | |
50 | #ifdef SIGTTOU | |
51 | signal (SIGTTOU, SIG_DFL); | |
52 | signal (SIGTTIN, SIG_DFL); | |
53 | #endif | |
54 | ||
55 | /* Clear this so the backend doesn't get confused, thinking | |
56 | CONT_THREAD died, and it needs to resume all threads. */ | |
c12a5089 | 57 | cs.cont_thread = null_ptid; |
2090129c SDJ |
58 | } |
59 | ||
60 | /* See nat/fork-inferior.h. */ | |
61 | ||
62 | void | |
63 | postfork_hook (pid_t pid) | |
64 | { | |
65 | } | |
66 | ||
67 | /* See nat/fork-inferior.h. */ | |
68 | ||
69 | void | |
70 | postfork_child_hook () | |
71 | { | |
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 | |
74 | for debugging. */ | |
75 | static int debug_setpgrp = 657473; | |
76 | ||
77 | debug_setpgrp = gdb_setpgid (); | |
78 | if (debug_setpgrp == -1) | |
79 | perror (_("setpgrp failed in child")); | |
80 | } | |
81 | ||
82 | /* See nat/fork-inferior.h. */ | |
83 | ||
84 | void | |
85 | gdb_flush_out_err () | |
86 | { | |
87 | fflush (stdout); | |
88 | fflush (stderr); | |
89 | } | |
90 | ||
91 | /* See server.h. */ | |
92 | ||
93 | void | |
94 | post_fork_inferior (int pid, const char *program) | |
95 | { | |
c12a5089 | 96 | client_state &cs = get_client_state (); |
2090129c SDJ |
97 | #ifdef SIGTTOU |
98 | signal (SIGTTOU, SIG_IGN); | |
99 | signal (SIGTTIN, SIG_IGN); | |
100 | terminal_fd = fileno (stderr); | |
101 | old_foreground_pgrp = tcgetpgrp (terminal_fd); | |
102 | tcsetpgrp (terminal_fd, pid); | |
103 | atexit (restore_old_foreground_pgrp); | |
104 | #endif | |
105 | ||
a9deee17 | 106 | process_info *proc = find_process_pid (pid); |
7e8621cf PA |
107 | |
108 | /* If the inferior fails to start, startup_inferior mourns the | |
109 | process (which deletes it), and then throws an error. This means | |
110 | that on exception return, we don't need or want to clear this | |
111 | flag back, as PROC won't exist anymore. Thus, we don't use a | |
112 | scoped_restore. */ | |
113 | proc->starting_up = true; | |
a9deee17 | 114 | |
5b6d1e4f PA |
115 | startup_inferior (the_target, pid, |
116 | START_INFERIOR_TRAPS_EXPECTED, | |
c12a5089 | 117 | &cs.last_status, &cs.last_ptid); |
7e8621cf PA |
118 | |
119 | /* If we get here, the process was successfully started. */ | |
120 | proc->starting_up = false; | |
121 | ||
2090129c | 122 | current_thread->last_resume_kind = resume_stop; |
c12a5089 | 123 | current_thread->last_status = cs.last_status; |
2090129c SDJ |
124 | signal_pid = pid; |
125 | target_post_create_inferior (); | |
126 | fprintf (stderr, "Process %s created; pid = %d\n", program, pid); | |
127 | fflush (stderr); | |
128 | } |