Commit | Line | Data |
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c906108c | 1 | /* Fork a Unix child process, and set up to debug it, for GDB. |
74a4fe32 | 2 | |
b811d2c2 | 3 | Copyright (C) 1990-2020 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 SS |
21 | |
22 | #include "defs.h" | |
d55e5aa6 | 23 | #include "inferior.h" |
4de283e4 | 24 | #include "gdbcmd.h" |
d55e5aa6 | 25 | #include "terminal.h" |
4de283e4 | 26 | #include "gdbthread.h" |
d55e5aa6 | 27 | #include "top.h" |
268a13a5 TT |
28 | #include "gdbsupport/job-control.h" |
29 | #include "gdbsupport/filestuff.h" | |
4de283e4 | 30 | #include "nat/fork-inferior.h" |
268a13a5 | 31 | #include "gdbsupport/common-inferior.h" |
6037b830 | 32 | |
2090129c SDJ |
33 | /* The exec-wrapper, if any, that will be used when starting the |
34 | inferior. */ | |
808480f6 | 35 | |
2090129c | 36 | static char *exec_wrapper = NULL; |
808480f6 | 37 | |
268a13a5 | 38 | /* See gdbsupport/common-inferior.h. */ |
808480f6 | 39 | |
2090129c SDJ |
40 | const char * |
41 | get_exec_wrapper () | |
808480f6 | 42 | { |
2090129c | 43 | return exec_wrapper; |
808480f6 PA |
44 | } |
45 | ||
2090129c | 46 | /* See nat/fork-inferior.h. */ |
808480f6 PA |
47 | |
48 | void | |
2090129c | 49 | gdb_flush_out_err () |
808480f6 | 50 | { |
2090129c SDJ |
51 | gdb_flush (main_ui->m_gdb_stdout); |
52 | gdb_flush (main_ui->m_gdb_stderr); | |
6037b830 | 53 | } |
c906108c | 54 | |
2090129c SDJ |
55 | /* The ui structure that will be saved on 'prefork_hook' and |
56 | restored on 'postfork_hook'. */ | |
57 | static struct ui *saved_ui = NULL; | |
0db8980c | 58 | |
2090129c | 59 | /* See nat/fork-inferior.h. */ |
0db8980c SDJ |
60 | |
61 | void | |
2090129c | 62 | prefork_hook (const char *args) |
0db8980c | 63 | { |
2090129c SDJ |
64 | gdb_assert (saved_ui == NULL); |
65 | /* Retain a copy of our UI, since the child will replace this value | |
66 | and if we're vforked, we have to restore it. */ | |
67 | saved_ui = current_ui; | |
49940788 | 68 | |
c906108c SS |
69 | /* Tell the terminal handling subsystem what tty we plan to run on; |
70 | it will just record the information for later. */ | |
05779d57 | 71 | new_tty_prefork (current_inferior ()->tty ()); |
2090129c | 72 | } |
c906108c | 73 | |
2090129c | 74 | /* See nat/fork-inferior.h. */ |
c906108c | 75 | |
2090129c SDJ |
76 | void |
77 | postfork_hook (pid_t pid) | |
78 | { | |
08036331 | 79 | inferior *inf = current_inferior (); |
6c95b8df PA |
80 | |
81 | inferior_appeared (inf, pid); | |
7f9f62ba | 82 | |
2090129c SDJ |
83 | gdb_assert (saved_ui != NULL); |
84 | current_ui = saved_ui; | |
85 | saved_ui = NULL; | |
191c4426 | 86 | |
2090129c | 87 | new_tty_postfork (); |
c906108c SS |
88 | } |
89 | ||
2090129c | 90 | /* See nat/fork-inferior.h. */ |
c906108c SS |
91 | |
92 | void | |
2090129c | 93 | postfork_child_hook () |
c906108c | 94 | { |
2090129c SDJ |
95 | /* This is set to the result of setpgrp, which if vforked, will be |
96 | visible to you in the parent process. It's only used by humans | |
97 | for debugging. */ | |
98 | static int debug_setpgrp = 657473; | |
99 | ||
100 | /* Make sure we switch to main_ui here in order to be able to | |
101 | use the fprintf_unfiltered/warning/error functions. */ | |
102 | current_ui = main_ui; | |
d90e17a7 | 103 | |
2090129c SDJ |
104 | /* Create a new session for the inferior process, if necessary. |
105 | It will also place the inferior in a separate process group. */ | |
106 | if (create_tty_session () <= 0) | |
98882a26 | 107 | { |
2090129c SDJ |
108 | /* No session was created, but we still want to run the inferior |
109 | in a separate process group. */ | |
110 | debug_setpgrp = gdb_setpgid (); | |
111 | if (debug_setpgrp == -1) | |
112 | perror (_("setpgrp failed in child")); | |
98882a26 PA |
113 | } |
114 | ||
2090129c SDJ |
115 | /* Ask the tty subsystem to switch to the one we specified |
116 | earlier (or to share the current terminal, if none was | |
117 | specified). */ | |
118 | new_tty (); | |
119 | } | |
c906108c | 120 | |
2090129c | 121 | /* See inferior.h. */ |
ccd213ac | 122 | |
2090129c SDJ |
123 | ptid_t |
124 | gdb_startup_inferior (pid_t pid, int num_traps) | |
125 | { | |
5b6d1e4f PA |
126 | inferior *inf = current_inferior (); |
127 | process_stratum_target *proc_target = inf->process_target (); | |
128 | ||
129 | ptid_t ptid = startup_inferior (proc_target, pid, num_traps, NULL, NULL); | |
2e979b94 PA |
130 | |
131 | /* Mark all threads non-executing. */ | |
719546c4 | 132 | set_executing (proc_target, ptid, false); |
2090129c SDJ |
133 | |
134 | return ptid; | |
c906108c | 135 | } |
ccd213ac DJ |
136 | |
137 | /* Implement the "unset exec-wrapper" command. */ | |
138 | ||
139 | static void | |
e0b2930c | 140 | unset_exec_wrapper_command (const char *args, int from_tty) |
ccd213ac DJ |
141 | { |
142 | xfree (exec_wrapper); | |
143 | exec_wrapper = NULL; | |
144 | } | |
145 | ||
98882a26 PA |
146 | static void |
147 | show_startup_with_shell (struct ui_file *file, int from_tty, | |
148 | struct cmd_list_element *c, const char *value) | |
149 | { | |
150 | fprintf_filtered (file, | |
151 | _("Use of shell to start subprocesses is %s.\n"), | |
152 | value); | |
153 | } | |
154 | ||
6c265988 | 155 | void _initialize_fork_child (); |
ccd213ac | 156 | void |
6c265988 | 157 | _initialize_fork_child () |
ccd213ac DJ |
158 | { |
159 | add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\ | |
160 | Set a wrapper for running programs.\n\ | |
161 | The wrapper prepares the system and environment for the new program."), | |
162 | _("\ | |
163 | Show the wrapper for running programs."), NULL, | |
164 | NULL, NULL, | |
165 | &setlist, &showlist); | |
166 | ||
167 | add_cmd ("exec-wrapper", class_run, unset_exec_wrapper_command, | |
168 | _("Disable use of an execution wrapper."), | |
169 | &unsetlist); | |
98882a26 PA |
170 | |
171 | add_setshow_boolean_cmd ("startup-with-shell", class_support, | |
172 | &startup_with_shell, _("\ | |
173 | Set use of shell to start subprocesses. The default is on."), _("\ | |
174 | Show use of shell to start subprocesses."), NULL, | |
175 | NULL, | |
176 | show_startup_with_shell, | |
177 | &setlist, &showlist); | |
ccd213ac | 178 | } |