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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
#include "runProcess.h"
#include "common.h"
#include <unistd.h>
#include <errno.h>
#if defined(HAVE_SIGNAL_H)
#include <signal.h>
#include <fcntl.h>
#endif
#if !defined(USE_POSIX_SPAWN)
ProcHandle
do_spawn_posix (char *const args[],
char *workingDirectory, char **environment,
struct std_handle *stdInHdl,
struct std_handle *stdOutHdl,
struct std_handle *stdErrHdl,
gid_t *childGroup, uid_t *childUser,
int flags,
char **failed_doing)
{
return -2;
}
#else
// Necessary for POSIX_SPAWN_SETSID under glibc.
#define _GNU_SOURCE
#include <spawn.h>
extern char **environ;
static int
setup_std_handle_spawn (int fd,
struct std_handle *hdl,
posix_spawn_file_actions_t *fa,
char **failed_doing)
{
switch (hdl->behavior) {
case STD_HANDLE_CLOSE:
// N.B. POSIX specifies that addclose() may result in spawnp() failing
// if the fd to-be-closed is already closed. Consequently, we must
// first open a file (e.g. /dev/null) and before attempting to close
// the fd. Fixes #251.
if (posix_spawn_file_actions_addopen(fa, fd, "/dev/null", O_RDONLY, 0) != 0) {
*failed_doing = "posix_spawn_file_actions_addopen";
return -1;
}
if (posix_spawn_file_actions_addclose(fa, fd) != 0) {
*failed_doing = "posix_spawn_file_actions_addclose";
return -1;
}
return 0;
case STD_HANDLE_USE_FD:
// N.B. POSIX specifies that dup2(x,x) should be a no-op, but
// naturally Apple ignores this and rather fails in posix_spawn on Big
// Sur.
if (hdl->use_fd != fd) {
if (posix_spawn_file_actions_adddup2(fa, hdl->use_fd, fd) != 0) {
*failed_doing = "posix_spawn_file_actions_adddup2";
return -1;
}
}
return 0;
case STD_HANDLE_USE_PIPE:
if (hdl->use_pipe.child_end != fd) {
if (posix_spawn_file_actions_adddup2(fa, hdl->use_pipe.child_end, fd) != 0) {
*failed_doing = "posix_spawn_file_actions_adddup2(child_end)";
return -1;
}
if (posix_spawn_file_actions_addclose(fa, hdl->use_pipe.child_end) != 0) {
*failed_doing = "posix_spawn_file_actions_addclose(child_end)";
return -1;
}
}
if (posix_spawn_file_actions_addclose(fa, hdl->use_pipe.parent_end) != 0) {
*failed_doing = "posix_spawn_file_actions_addclose(parent_end)";
return -1;
}
return 0;
default:
// N.B. this should be unreachable
// but some compilers apparently can't
// see this.
*failed_doing = "posix_spawn_file_actions_addclose(invalid behavior)";
return -1;
}
}
/* Try spawning with posix_spawn. Returns -1 if posix_spawn (or the particular
* requested configuration) is not supported.
*/
ProcHandle
do_spawn_posix (char *const args[],
char *workingDirectory, char **environment,
struct std_handle *stdInHdl,
struct std_handle *stdOutHdl,
struct std_handle *stdErrHdl,
gid_t *childGroup, uid_t *childUser,
int flags,
char **failed_doing)
{
// First do catch some cases that posix_spawn simply can't handle...
if (childGroup || childUser) {
return -2;
}
if ((flags & RUN_PROCESS_IN_CLOSE_FDS) != 0) {
// TODO: can this be efficiently supported?
return -2;
}
// Now the main act...
pid_t pid;
posix_spawn_file_actions_t fa;
posix_spawnattr_t sa;
int r;
ProcHandle ret;
short spawn_flags = 0;
r = posix_spawn_file_actions_init(&fa);
if (r != 0) {
*failed_doing = "posix_spawn_file_actions_init";
return -1;
}
r = posix_spawnattr_init(&sa);
if (r != 0) {
posix_spawn_file_actions_destroy(&fa);
*failed_doing = "posix_spawnattr_init";
return -1;
}
if (workingDirectory) {
#if defined(HAVE_posix_spawn_file_actions_addchdir)
r = posix_spawn_file_actions_addchdir(&fa, workingDirectory);
if (r != 0) {
*failed_doing = "posix_spawn_file_actions_addchdir";
goto fail;
}
#elif defined(HAVE_posix_spawn_file_actions_addchdir_np)
// N.B. this function is broken on macOS.
// See https://github.com/rust-lang/rust/pull/80537.
r = posix_spawn_file_actions_addchdir_np(&fa, workingDirectory);
if (r != 0) {
*failed_doing = "posix_spawn_file_actions_addchdir_np";
goto fail;
}
#else
goto not_supported;
#endif
}
if ((flags & RUN_PROCESS_NEW_SESSION) != 0) {
#if defined(HAVE_POSIX_SPAWN_SETSID)
// N.B. POSIX_SPAWN_SETSID is only supported on macOS 10.15 and later,
// but an proper error is not returned in earlier versions.
// See https://bugs.python.org/issue37586.
if (posix_spawnattr_setflags(&sa, POSIX_SPAWN_SETSID) != 0) {
*failed_doing = "posix_spawnattr_setflags(POSIX_SPAWN_SETSID)";
goto fail;
}
#elif defined(HAVE_POSIX_SPAWN_SETSID_NP)
if (posix_spawnattr_setflags(&sa, POSIX_SPAWN_SETSID_NP) != 0) {
*failed_doing = "posix_spawnattr_setflags(POSIX_SPAWN_SETSID_NP)";
goto fail;
}
#else
goto not_supported;
#endif
}
if ((flags & RUN_PROCESS_IN_NEW_GROUP) != 0) {
#if defined(HAVE_POSIX_SPAWN_SETPGROUP)
spawn_flags |= POSIX_SPAWN_SETPGROUP;
#else
goto not_supported;
#endif
}
if (setup_std_handle_spawn(STDIN_FILENO, stdInHdl, &fa, failed_doing) != 0) {
goto fail;
}
if (setup_std_handle_spawn(STDOUT_FILENO, stdOutHdl, &fa, failed_doing) != 0) {
goto fail;
}
if (setup_std_handle_spawn(STDERR_FILENO, stdErrHdl, &fa, failed_doing) != 0) {
goto fail;
}
sigset_t ss;
if ((flags & RESET_INT_QUIT_HANDLERS) != 0) {
if (sigemptyset(&ss) == -1) {
*failed_doing = "sigemptyset";
goto fail;
}
if (sigaddset(&ss, SIGINT) == -1) {
*failed_doing = "sigaddset(SIGINT)";
goto fail;
}
if (sigaddset(&ss, SIGQUIT) == -1) {
*failed_doing = "sigaddset(SIGQUIT)";
goto fail;
}
if (posix_spawnattr_setsigdefault(&sa, &ss) != 0) {
*failed_doing = "posix_spawnattr_setsigdefault";
goto fail;
}
spawn_flags |= POSIX_SPAWN_SETSIGDEF;
}
if (posix_spawnattr_setflags(&sa, spawn_flags) != 0) {
*failed_doing = "posix_spawnattr_setflags";
goto fail;
}
r = posix_spawnp(&pid, args[0], &fa, &sa, args, environment ? environment : environ);
if (r != 0) {
errno = r; // posix_spawn doesn't necessarily set errno; see #227.
*failed_doing = "posix_spawnp";
goto fail;
} else {
ret = pid;
goto finish;
}
not_supported:
ret = -2;
goto finish;
fail:
ret = -1;
goto finish;
finish:
posix_spawn_file_actions_destroy(&fa);
posix_spawnattr_destroy(&sa);
return ret;
}
#endif
|
