blob: 3a3260e00fcd96bf5df17dc6436a384f60693d8f (
plain)
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
|
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
/**
* NOTE: requires fdescfs to be mounted to run interpreted files (starting with #!)
*/
char *args[] = { "batchrun", NULL };
int
main(int argc, char **argv)
{
char buf[2];
ssize_t ret;
int tries = 0;
int fd = 3;
if (argc > 1) {
fd = atoi(argv[1]);
}
retry:
if (tries++ >= 3)
errx(1, "Failed to read file header");
ret = pread(fd, buf, sizeof(buf), 0);
if (ret == 2) {
if (strncmp(buf, "#!", 2) != 0) {
fcntl(3, F_SETFD, FD_CLOEXEC);
}
} else if (ret == -1) {
if (errno == EINTR)
goto retry;
} else if (ret != 0) {
goto retry;
}
fexecve(fd, args, NULL);
err(1, "fexecve()");
}
|
