common/socket.c

   1 /*
   2  * socket.c - awesome client, communicate with socket, common functions
   3  *
   4  * Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
   5  * Copyright © 2007 daniel@brinkers.de
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #include <stdio.h>
  24 #include <errno.h>
  25 #include <sys/socket.h>
  26 #include <sys/un.h>
  27
  28 #include <xcb/xcb.h>
  29
  30 #include "common/socket.h"
  31 #include "common/util.h"
  32
  33 #define CONTROL_UNIX_SOCKET_PATH ".awesome_ctl."
  34
  35 /** Get a sockaddr_un struct with information feeded for opening a
  36  * communication to the awesome socket for given display
  37  * \param display the display number
  38  * \return sockaddr_un struct ready to be used or NULL if a problem occured
  39  */
  40 struct sockaddr_un *
  41 socket_getaddr(const char *display)
  42 {
  43     char *homedir, *host = NULL;
  44     int screenp = 0, displayp = 0;
  45     ssize_t path_len, len;
  46     struct sockaddr_un *addr;
  47
  48     addr = p_new(struct sockaddr_un, 1);
  49     homedir = getenv("HOME");
  50
  51     xcb_parse_display(NULL, &host, &displayp, &screenp);
  52
  53     len = a_strlen(host);
  54
  55     /* + 2 for / and . and \0 */
  56     path_len = snprintf(addr->sun_path, sizeof(addr->sun_path),
  57                         "%s/" CONTROL_UNIX_SOCKET_PATH "%s%s%d",
  58                         homedir, len ? host : "", len ? "." : "",
  59                         displayp);
  60
  61     p_delete(&host);
  62
  63     if(path_len >= ssizeof(addr->sun_path))
  64     {
  65         fprintf(stderr, "error: path of control UNIX domain socket is too long");
  66         return NULL;
  67     }
  68
  69     addr->sun_family = AF_UNIX;
  70
  71     return addr;
  72 }
  73
  74 /** Get a AF_UNIX socket for communicating with awesome
  75  * \return the socket file descriptor
  76  */
  77 int
  78 socket_getclient(void)
  79 {
  80     int csfd;
  81     #ifndef __FreeBSD__
  82     csfd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
  83     #else
  84     csfd = socket(PF_UNIX, SOCK_STREAM, 0);
  85     #endif
  86
  87     if(csfd < 0)
  88         warn("error opening UNIX domain socket: %s", strerror(errno));
  89
  90     return csfd;
  91 }
  92 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80