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