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
|
#include <fcntl.h>
#include <stdio.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/wait.h>
int main(void) {
int tfd[2];
int s;
if ((tfd[0] = open("/dev/ptmx", O_RDONLY)) < 0)
err(1, "failed to open ptmx");
int unlock = 0;
if (ioctl(tfd[0], TIOCSPTLCK, &unlock) < 0)
err(1, "failed to do ioctl TIOCSPTLCK");
if (ioctl(tfd[0], TIOCGPTN, &s) < 0)
err(1, "failed to do ioctl TIOCGPTN");
char slave_name[128];
snprintf(slave_name, 128, "/dev/pts/%d", s);
if ((tfd[1] = open(slave_name, O_RDONLY)) < 0)
err(1, "failed to open %s", slave_name);
pid_t self, child;
self = getpid();
child = fork();
if (child == 0) {
if (dup2(tfd[1], tfd[0]) < 0)
err(1, "failed to dup2(%d, %d)", tfd[1], tfd[0]);
close(tfd[1]);
pause();
return 0;
} else if (child < 0) {
perror("fork");
return 1;
}
printf("%d %d %d %d %d\n", self, child, tfd[0], tfd[1], s);
fflush(stdout);
wait(NULL);
return 0;
}
|
