1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/* Fork a Unix child process, and set up to debug it, for GDB.
Copyright (C) 1990-2020 Free Software Foundation, Inc.
Contributed by Cygnus Support.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
#include "gdbcmd.h"
#include "terminal.h"
#include "gdbthread.h"
#include "top.h"
#include "gdbsupport/job-control.h"
#include "gdbsupport/filestuff.h"
#include "nat/fork-inferior.h"
#include "gdbsupport/common-inferior.h"
/* The exec-wrapper, if any, that will be used when starting the
inferior. */
static char *exec_wrapper = NULL;
/* See gdbsupport/common-inferior.h. */
const char *
get_exec_wrapper ()
{
return exec_wrapper;
}
/* See nat/fork-inferior.h. */
void
gdb_flush_out_err ()
{
gdb_flush (main_ui->m_gdb_stdout);
gdb_flush (main_ui->m_gdb_stderr);
}
/* The ui structure that will be saved on 'prefork_hook' and
restored on 'postfork_hook'. */
static struct ui *saved_ui = NULL;
/* See nat/fork-inferior.h. */
void
prefork_hook (const char *args)
{
const char *inferior_io_terminal = get_inferior_io_terminal ();
gdb_assert (saved_ui == NULL);
/* Retain a copy of our UI, since the child will replace this value
and if we're vforked, we have to restore it. */
saved_ui = current_ui;
/* Tell the terminal handling subsystem what tty we plan to run on;
it will just record the information for later. */
new_tty_prefork (inferior_io_terminal);
}
/* See nat/fork-inferior.h. */
void
postfork_hook (pid_t pid)
{
inferior *inf = current_inferior ();
inferior_appeared (inf, pid);
/* Needed for wait_for_inferior stuff. */
inferior_ptid = ptid_t (pid);
gdb_assert (saved_ui != NULL);
current_ui = saved_ui;
saved_ui = NULL;
new_tty_postfork ();
}
/* See nat/fork-inferior.h. */
void
postfork_child_hook ()
{
/* This is set to the result of setpgrp, which if vforked, will be
visible to you in the parent process. It's only used by humans
for debugging. */
static int debug_setpgrp = 657473;
/* Make sure we switch to main_ui here in order to be able to
use the fprintf_unfiltered/warning/error functions. */
current_ui = main_ui;
/* Create a new session for the inferior process, if necessary.
It will also place the inferior in a separate process group. */
if (create_tty_session () <= 0)
{
/* No session was created, but we still want to run the inferior
in a separate process group. */
debug_setpgrp = gdb_setpgid ();
if (debug_setpgrp == -1)
perror (_("setpgrp failed in child"));
}
/* Ask the tty subsystem to switch to the one we specified
earlier (or to share the current terminal, if none was
specified). */
new_tty ();
}
/* See inferior.h. */
ptid_t
gdb_startup_inferior (pid_t pid, int num_traps)
{
ptid_t ptid = startup_inferior (pid, num_traps, NULL, NULL);
/* Mark all threads non-executing. */
set_executing (ptid, 0);
return ptid;
}
/* Implement the "unset exec-wrapper" command. */
static void
unset_exec_wrapper_command (const char *args, int from_tty)
{
xfree (exec_wrapper);
exec_wrapper = NULL;
}
static void
show_startup_with_shell (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file,
_("Use of shell to start subprocesses is %s.\n"),
value);
}
void
_initialize_fork_child (void)
{
add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\
Set a wrapper for running programs.\n\
The wrapper prepares the system and environment for the new program."),
_("\
Show the wrapper for running programs."), NULL,
NULL, NULL,
&setlist, &showlist);
add_cmd ("exec-wrapper", class_run, unset_exec_wrapper_command,
_("Disable use of an execution wrapper."),
&unsetlist);
add_setshow_boolean_cmd ("startup-with-shell", class_support,
&startup_with_shell, _("\
Set use of shell to start subprocesses. The default is on."), _("\
Show use of shell to start subprocesses."), NULL,
NULL,
show_startup_with_shell,
&setlist, &showlist);
}
|
