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
|
/* ----------------------------------------------------------------------- *
*
* spawn.c - run programs synchronously with output redirected to syslog
*
* Copyright 1997 Transmeta Corporation - All Rights Reserved
*
* 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, Inc., 675 Mass Ave, Cambridge MA 02139,
* USA; either version 2 of the License, or (at your option) any later
* version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <sys/wait.h>
#include "automount.h"
/* Used by subprocesses to avoid carrying over the main daemon's rather
weird signalling environment */
void reset_signals(void)
{
struct sigaction sa;
sigset_t allsignals;
int i;
sigfillset(&allsignals);
sigprocmask(SIG_BLOCK, &allsignals, NULL);
sa.sa_handler = SIG_DFL;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
for ( i = 1 ; i < NSIG ; i++ )
sigaction(i, &sa, NULL);
sigprocmask(SIG_UNBLOCK, &allsignals, NULL);
}
#define ERRBUFSIZ 2047 /* Max length of error string excl \0 */
int spawnv(int logpri, char *prog, char **argv) {
pid_t f;
int status, pipefd[2];
char errbuf[ERRBUFSIZ+1], *p, *sp;
int errp, errn;
sigset_t allsignals, tmpsig, oldsig;
sigfillset(&allsignals);
sigprocmask(SIG_BLOCK, &allsignals, &oldsig);
if ( pipe(pipefd) )
return -1;
f = fork();
if ( f < 0 ) {
sigprocmask(SIG_SETMASK, &oldsig, NULL);
return -1;
} else if ( f == 0 ) {
reset_signals();
close(pipefd[0]);
dup2(pipefd[1], STDOUT_FILENO);
dup2(pipefd[1], STDERR_FILENO);
close(pipefd[1]);
execv(prog, argv);
_exit(255); /* execv() failed */
} else {
/* Careful here -- if we enable SIGCHLD yet we may not receive the
waitpid() at the end */
tmpsig = oldsig;
sigaddset(&tmpsig, SIGCHLD);
sigprocmask(SIG_SETMASK, &tmpsig, NULL);
close(pipefd[1]);
if ( f < 0 ) {
close(pipefd[0]);
return -1;
}
errp = 0;
do {
while ( (errn = read(pipefd[0], errbuf+errp, ERRBUFSIZ-errp)) == -1
&& errno == EINTR );
if ( errn > 0 ) {
errp += errn;
sp = errbuf;
while ( errp && (p = memchr(sp, '\n', errp)) ) {
*p++ = '\0';
if ( sp[0] ) /* Don't output empty lines */
syslog(logpri, ">> %s", sp);
errp -= (p-sp);
sp = p;
}
if ( errp && sp != errbuf )
memmove(errbuf, sp, errp);
if ( errp >= ERRBUFSIZ ) {
/* Line too long, split */
errbuf[errp] = '\0';
syslog(logpri, ">> %s", errbuf);
errp = 0;
}
}
} while ( errn > 0 );
close(pipefd[0]);
if ( errp > 0 ) {
/* End of file without \n */
errbuf[errp] = '\0';
syslog(logpri, ">> %s", errbuf);
}
if ( waitpid(f, &status, 0) != f )
status = -1; /* waitpid() failed */
sigprocmask(SIG_SETMASK, &oldsig, NULL);
return status;
}
}
int spawnl(int logpri, char *prog, ...)
{
va_list arg;
int argc;
char **argv, **p;
va_start(arg,prog);
for ( argc = 1 ; va_arg(arg,char *) ; argc++ );
va_end(arg);
if ( !(argv = alloca(sizeof(char *) * argc)) )
return -1;
va_start(arg,prog);
p = argv;
while ((*p++ = va_arg(arg,char *)));
va_end(arg);
return spawnv(logpri, prog, argv);
}
|
