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c906108c | 1 | /* Fork a Unix child process, and set up to debug it, for GDB. |
74a4fe32 | 2 | |
1d506c26 | 3 | Copyright (C) 1990-2024 Free Software Foundation, Inc. |
74a4fe32 | 4 | |
c906108c SS |
5 | Contributed by Cygnus Support. |
6 | ||
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 12 | (at your option) any later version. |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b | 19 | You should have received a copy of the GNU General Public License |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c | 21 | |
d55e5aa6 | 22 | #include "inferior.h" |
5b9707eb | 23 | #include "cli/cli-cmds.h" |
d55e5aa6 | 24 | #include "terminal.h" |
4de283e4 | 25 | #include "gdbthread.h" |
13d03262 | 26 | #include "ui.h" |
268a13a5 TT |
27 | #include "gdbsupport/job-control.h" |
28 | #include "gdbsupport/filestuff.h" | |
4de283e4 | 29 | #include "nat/fork-inferior.h" |
268a13a5 | 30 | #include "gdbsupport/common-inferior.h" |
6037b830 | 31 | |
2090129c SDJ |
32 | /* The exec-wrapper, if any, that will be used when starting the |
33 | inferior. */ | |
808480f6 | 34 | |
e0700ba4 | 35 | static std::string exec_wrapper; |
808480f6 | 36 | |
268a13a5 | 37 | /* See gdbsupport/common-inferior.h. */ |
808480f6 | 38 | |
2090129c SDJ |
39 | const char * |
40 | get_exec_wrapper () | |
808480f6 | 41 | { |
e0700ba4 | 42 | return !exec_wrapper.empty () ? exec_wrapper.c_str () : nullptr; |
808480f6 PA |
43 | } |
44 | ||
2090129c | 45 | /* See nat/fork-inferior.h. */ |
808480f6 PA |
46 | |
47 | void | |
2090129c | 48 | gdb_flush_out_err () |
808480f6 | 49 | { |
2090129c SDJ |
50 | gdb_flush (main_ui->m_gdb_stdout); |
51 | gdb_flush (main_ui->m_gdb_stderr); | |
6037b830 | 52 | } |
c906108c | 53 | |
2090129c SDJ |
54 | /* The ui structure that will be saved on 'prefork_hook' and |
55 | restored on 'postfork_hook'. */ | |
56 | static struct ui *saved_ui = NULL; | |
0db8980c | 57 | |
2090129c | 58 | /* See nat/fork-inferior.h. */ |
0db8980c SDJ |
59 | |
60 | void | |
2090129c | 61 | prefork_hook (const char *args) |
0db8980c | 62 | { |
2090129c SDJ |
63 | gdb_assert (saved_ui == NULL); |
64 | /* Retain a copy of our UI, since the child will replace this value | |
65 | and if we're vforked, we have to restore it. */ | |
66 | saved_ui = current_ui; | |
49940788 | 67 | |
c906108c SS |
68 | /* Tell the terminal handling subsystem what tty we plan to run on; |
69 | it will just record the information for later. */ | |
05779d57 | 70 | new_tty_prefork (current_inferior ()->tty ()); |
2090129c | 71 | } |
c906108c | 72 | |
2090129c | 73 | /* See nat/fork-inferior.h. */ |
c906108c | 74 | |
2090129c SDJ |
75 | void |
76 | postfork_hook (pid_t pid) | |
77 | { | |
08036331 | 78 | inferior *inf = current_inferior (); |
6c95b8df PA |
79 | |
80 | inferior_appeared (inf, pid); | |
7f9f62ba | 81 | |
2090129c SDJ |
82 | gdb_assert (saved_ui != NULL); |
83 | current_ui = saved_ui; | |
84 | saved_ui = NULL; | |
191c4426 | 85 | |
2090129c | 86 | new_tty_postfork (); |
c906108c SS |
87 | } |
88 | ||
2090129c | 89 | /* See nat/fork-inferior.h. */ |
c906108c SS |
90 | |
91 | void | |
2090129c | 92 | postfork_child_hook () |
c906108c | 93 | { |
2090129c SDJ |
94 | /* This is set to the result of setpgrp, which if vforked, will be |
95 | visible to you in the parent process. It's only used by humans | |
96 | for debugging. */ | |
97 | static int debug_setpgrp = 657473; | |
98 | ||
99 | /* Make sure we switch to main_ui here in order to be able to | |
6cb06a8c | 100 | use the gdb_printf/warning/error functions. */ |
2090129c | 101 | current_ui = main_ui; |
d90e17a7 | 102 | |
2090129c SDJ |
103 | /* Create a new session for the inferior process, if necessary. |
104 | It will also place the inferior in a separate process group. */ | |
105 | if (create_tty_session () <= 0) | |
98882a26 | 106 | { |
2090129c SDJ |
107 | /* No session was created, but we still want to run the inferior |
108 | in a separate process group. */ | |
109 | debug_setpgrp = gdb_setpgid (); | |
110 | if (debug_setpgrp == -1) | |
111 | perror (_("setpgrp failed in child")); | |
98882a26 PA |
112 | } |
113 | ||
2090129c SDJ |
114 | /* Ask the tty subsystem to switch to the one we specified |
115 | earlier (or to share the current terminal, if none was | |
116 | specified). */ | |
117 | new_tty (); | |
118 | } | |
c906108c | 119 | |
2090129c | 120 | /* See inferior.h. */ |
ccd213ac | 121 | |
2090129c SDJ |
122 | ptid_t |
123 | gdb_startup_inferior (pid_t pid, int num_traps) | |
124 | { | |
5b6d1e4f PA |
125 | inferior *inf = current_inferior (); |
126 | process_stratum_target *proc_target = inf->process_target (); | |
127 | ||
a9deee17 PA |
128 | scoped_restore save_starting_up |
129 | = make_scoped_restore (&inf->starting_up, true); | |
130 | ||
5b6d1e4f | 131 | ptid_t ptid = startup_inferior (proc_target, pid, num_traps, NULL, NULL); |
2e979b94 PA |
132 | |
133 | /* Mark all threads non-executing. */ | |
719546c4 | 134 | set_executing (proc_target, ptid, false); |
2090129c SDJ |
135 | |
136 | return ptid; | |
c906108c | 137 | } |
ccd213ac DJ |
138 | |
139 | /* Implement the "unset exec-wrapper" command. */ | |
140 | ||
141 | static void | |
e0b2930c | 142 | unset_exec_wrapper_command (const char *args, int from_tty) |
ccd213ac | 143 | { |
e0700ba4 | 144 | exec_wrapper.clear (); |
ccd213ac DJ |
145 | } |
146 | ||
98882a26 PA |
147 | static void |
148 | show_startup_with_shell (struct ui_file *file, int from_tty, | |
149 | struct cmd_list_element *c, const char *value) | |
150 | { | |
6cb06a8c TT |
151 | gdb_printf (file, |
152 | _("Use of shell to start subprocesses is %s.\n"), | |
153 | value); | |
98882a26 PA |
154 | } |
155 | ||
6c265988 | 156 | void _initialize_fork_child (); |
ccd213ac | 157 | void |
6c265988 | 158 | _initialize_fork_child () |
ccd213ac DJ |
159 | { |
160 | add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\ | |
161 | Set a wrapper for running programs.\n\ | |
162 | The wrapper prepares the system and environment for the new program."), | |
163 | _("\ | |
164 | Show the wrapper for running programs."), NULL, | |
165 | NULL, NULL, | |
166 | &setlist, &showlist); | |
167 | ||
168 | add_cmd ("exec-wrapper", class_run, unset_exec_wrapper_command, | |
dda83cd7 SM |
169 | _("Disable use of an execution wrapper."), |
170 | &unsetlist); | |
98882a26 PA |
171 | |
172 | add_setshow_boolean_cmd ("startup-with-shell", class_support, | |
173 | &startup_with_shell, _("\ | |
174 | Set use of shell to start subprocesses. The default is on."), _("\ | |
175 | Show use of shell to start subprocesses."), NULL, | |
176 | NULL, | |
177 | show_startup_with_shell, | |
178 | &setlist, &showlist); | |
ccd213ac | 179 | } |