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
|
#include "udpc_process.h"
#include "log.h"
#ifndef __MINGW32__
#include <unistd.h>
#include <string.h>
#include <errno.h>
static void dupFd(int src, int target) {
if(src != target) {
close(target);
if(dup2(src, target) < 0)
udpc_fatal(1, "dup2 %d->%d: %s\n", src, target, strerror(errno));
close(src);
}
}
int open2(int in, int out, char **arg, int closeFd) {
int pid;
switch( (pid=fork()) ) {
case 0: /* child */
dupFd(in,0);
dupFd(out,1);
if(closeFd != -1)
close(closeFd);
execvp(arg[0], arg);
udpc_fatal(1, "exec %s: %s\n", arg[0], strerror(errno));
case -1: /* fork error */
perror("fork");
return -1;
default: /* Father: just return */
return pid;
}
}
#else /* __MINGW32__ */
#include <errno.h>
#include <stdio.h>
#include <string.h>
/* Thanks http://lists.gnu.org/archive/html/groff/2003-07/msg00107.html */
static int dupFd(int src, int target, int *savedFd) {
*savedFd = -1;
if(src != target) {
if ((*savedFd = dup (target)) < 0)
udpc_fatal(1, "dup parent_fd %d %s", target, strerror(errno));
if (dup2 (src, target) < 0)
udpc_fatal(1, "dup2 child_fd %d %s", target, strerror(errno));
}
return 0;
}
static int restoreFd(int src, int target) {
if(src == -1 || src == target)
/* Do nothing... */
return 0;
if (dup2 (src, target) < 0)
udpc_fatal(1, "restore child_fd %d %s", target, strerror(errno));
close(src);
return 0;
}
int open2(int in, int out, char **arg, int closeFd) {
int parent_in=-1;
int parent_out=-1;
int child;
dupFd(in, 0, &parent_in);
dupFd(out, 1, &parent_out);
child = _spawnvp(P_NOWAIT, arg[0], (const char* const*)&arg[1]);
restoreFd(parent_in, 0);
restoreFd(parent_out, 1);
return child;
}
#endif /* __MINGW32__ */
|
