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
|
#define _GNU_SOURCE
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include "server-tty.h"
static void destruct(struct stream *s) {
assert(s && s->user);
if (unlink((char*) s->user) < 0)
fprintf(stderr, "WARNING: unlink(): %s\n", strerror(errno));
free(s->user);
}
struct stream* stream_server_tty(const char *args) {
struct stream *s = NULL;
int fd = -1;
char *n;
s = malloc(sizeof(struct stream));
assert(s);
memset(s, 0, sizeof(struct stream));
if ((fd = open("/dev/ptmx", O_RDWR|O_NOCTTY)) < 0) {
fprintf(stderr, "open('/dev/ptmx', O_RDWR|O_NOCTTY): %s\n", strerror(errno));
goto fail;
}
if (grantpt(fd) < 0) {
fprintf(stderr, "grantpt(): %s\n", strerror(errno));
goto fail;
}
if (unlockpt(fd) < 0) {
fprintf(stderr, "grantpt(): %s\n", strerror(errno));
goto fail;
}
if (!(n = ptsname(fd)) < 0) {
fprintf(stderr, "ptsname(): %s\n", strerror(errno));
goto fail;
}
if (args) {
if (symlink(n, args) < 0) {
fprintf(stderr, "symlink('%s', '%s'): %s\n", n, args, strerror(errno));
goto fail;
}
} else
fprintf(stderr, "Allocated pseudo tty '%s'.\n", n);
s->user = strdup(args);
s->destruct = destruct;
s->input_fd = s->output_fd = fd;
return s;
fail:
free(s);
if (fd >= 0)
close(fd);
return NULL;
}
|
