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
|
/* ISC license. */
#include <skalibs/sysdeps.h>
#include <errno.h>
#include <skalibs/djbunix.h>
#ifdef SKALIBS_HASPOSIXSPAWN
#include <signal.h>
#include <spawn.h>
#include <stdlib.h>
#include <skalibs/config.h>
pid_t child_spawn1_internal (char const *prog, char const *const *argv, char const *const *envp, int *p, int to)
{
pid_t pid ;
posix_spawn_file_actions_t actions ;
posix_spawnattr_t attr ;
sigset_t set ;
int e ;
int nopath = !getenv("PATH") ;
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
int syncpipe[2] ;
if (pipecoe(syncpipe) == -1) goto err ;
#endif
if (coe(p[!(to & 1)]) == -1) goto errp ;
e = posix_spawnattr_init(&attr) ;
if (e) goto erre ;
sigemptyset(&set) ;
e = posix_spawnattr_setsigmask(&attr, &set) ;
if (e) goto errattr ;
e = posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETSIGMASK) ;
if (e) goto errattr ;
e = posix_spawn_file_actions_init(&actions) ;
if (e) goto errattr ;
if (p[to & 1] != (to & 1))
{
e = posix_spawn_file_actions_adddup2(&actions, p[to & 1], to & 1) ;
if (e) goto erractions ;
e = posix_spawn_file_actions_addclose(&actions, p[to & 1]) ;
if (e) goto erractions ;
}
if (to & 2)
{
e = posix_spawn_file_actions_adddup2(&actions, to & 1, !(to & 1)) ;
if (e) goto erractions ;
}
if (nopath && (setenv("PATH", SKALIBS_DEFAULTPATH, 0) < 0)) { e = errno ; goto erractions ; }
e = posix_spawnp(&pid, prog, &actions, &attr, (char *const *)argv, (char *const *)envp) ;
if (nopath) unsetenv("PATH") ;
if (e) goto erractions ;
posix_spawn_file_actions_destroy(&actions) ;
posix_spawnattr_destroy(&attr) ;
fd_close(p[to & 1]) ;
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
return child_spawn_workaround(pid, syncpipe) ;
#else
return pid ;
#endif
erractions:
posix_spawn_file_actions_destroy(&actions) ;
errattr:
posix_spawnattr_destroy(&attr) ;
erre:
errno = e ;
errp:
#ifdef SKALIBS_HASPOSIXSPAWNEARLYRETURN
fd_close(syncpipe[1]) ;
fd_close(syncpipe[0]) ;
err:
#endif
fd_close(p[1]) ;
fd_close(p[0]) ;
return 0 ;
}
#else
#include <unistd.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/sig.h>
#include <skalibs/exec.h>
pid_t child_spawn1_internal (char const *prog, char const *const *argv, char const *const *envp, int *p, int to)
{
pid_t pid ;
int syncpipe[2] ;
char c ;
if (coe(p[0]) < 0 || pipecoe(syncpipe) < 0) goto err ;
pid = fork() ;
if (pid < 0) goto errsp ;
if (!pid)
{
fd_close(p[!(to & 1)]) ;
if (fd_move(to & 1, p[to & 1]) < 0) goto syncdie ;
if ((to & 2) && (fd_copy(!(to & 1), to & 1) < 0)) goto syncdie ;
sig_blocknone() ;
exec_ae(prog, argv, envp) ;
syncdie:
c = errno ;
fd_write(syncpipe[1], &c, 1) ;
_exit(127) ;
}
fd_close(syncpipe[1]) ;
syncpipe[1] = fd_read(syncpipe[0], &c, 1) ;
if (syncpipe[1])
{
int e = (unsigned char)c ;
if (syncpipe[1] == -1) e = errno ;
if (wait_pid(pid, 0) == -1) e = errno ;
errno = e ;
goto errsp0 ;
}
fd_close(syncpipe[0]) ;
fd_close(p[to & 1]) ;
return pid ;
errsp:
fd_close(syncpipe[1]) ;
errsp0:
fd_close(syncpipe[0]) ;
err:
fd_close(p[1]) ;
fd_close(p[0]) ;
return 0 ;
}
#endif
|
