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2090129c SDJ |
1 | /* Fork a Unix child process, and set up to debug it, for GDBserver. |
2 | Copyright (C) 1989-2017 Free Software Foundation, Inc. | |
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 | ||
19 | #include "server.h" | |
20 | #include "job-control.h" | |
21 | #include "nat/fork-inferior.h" | |
22 | ||
23 | #ifdef SIGTTOU | |
24 | /* A file descriptor for the controlling terminal. */ | |
25 | static int terminal_fd; | |
26 | ||
27 | /* TERMINAL_FD's original foreground group. */ | |
28 | static pid_t old_foreground_pgrp; | |
29 | ||
30 | /* Hand back terminal ownership to the original foreground group. */ | |
31 | ||
32 | static void | |
33 | restore_old_foreground_pgrp (void) | |
34 | { | |
35 | tcsetpgrp (terminal_fd, old_foreground_pgrp); | |
36 | } | |
37 | #endif | |
38 | ||
39 | /* See nat/fork-inferior.h. */ | |
40 | ||
41 | void | |
42 | prefork_hook (const char *args) | |
43 | { | |
44 | if (debug_threads) | |
45 | { | |
46 | debug_printf ("args: %s\n", args); | |
47 | debug_flush (); | |
48 | } | |
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. */ | |
57 | cont_thread = null_ptid; | |
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 | { | |
96 | #ifdef SIGTTOU | |
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); | |
103 | #endif | |
104 | ||
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; | |
109 | signal_pid = pid; | |
110 | target_post_create_inferior (); | |
111 | fprintf (stderr, "Process %s created; pid = %d\n", program, pid); | |
112 | fflush (stderr); | |
113 | } |