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
|
/*
* vim:ts=4:sw=4:expandtab
*
* i3 - an improved tiling window manager
* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
*
*/
#include "libi3.h"
#include <unistd.h>
#include <libgen.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
/*
* Creates the UNIX domain socket at the given path, sets it to non-blocking
* mode, bind()s and listen()s on it.
*
* The full path to the socket is stored in the char* that out_socketpath points
* to.
*
*/
int create_socket(const char *filename, char **out_socketpath) {
char *resolved = resolve_tilde(filename);
DLOG("Creating UNIX socket at %s\n", resolved);
char *copy = sstrdup(resolved);
const char *dir = dirname(copy);
if (!path_exists(dir)) {
mkdirp(dir, DEFAULT_DIR_MODE);
}
free(copy);
/* Check if the socket is in use by another process (this call does not
* succeed if the socket is stale / the owner already exited) */
int sockfd = ipc_connect_impl(resolved);
if (sockfd != -1) {
ELOG("Refusing to create UNIX socket at %s: Socket is already in use\n", resolved);
close(sockfd);
errno = EEXIST;
return -1;
}
/* Unlink the unix domain socket before */
unlink(resolved);
sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
if (sockfd < 0) {
perror("socket()");
free(resolved);
return -1;
}
(void)fcntl(sockfd, F_SETFD, FD_CLOEXEC);
struct sockaddr_un addr;
memset(&addr, 0, sizeof(struct sockaddr_un));
addr.sun_family = AF_LOCAL;
strncpy(addr.sun_path, resolved, sizeof(addr.sun_path) - 1);
if (bind(sockfd, (struct sockaddr *)&addr, sizeof(struct sockaddr_un)) < 0) {
perror("bind()");
free(resolved);
return -1;
}
set_nonblock(sockfd);
if (listen(sockfd, 5) < 0) {
perror("listen()");
free(resolved);
return -1;
}
free(*out_socketpath);
*out_socketpath = resolved;
return sockfd;
}
|
