129 lines
4.0 KiB
C
129 lines
4.0 KiB
C
/*
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* socket.c - awesome client, communicate with socket, common functions
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*
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* Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
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* Copyright © 2007 daniel@brinkers.de
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include <xcb/xcb.h>
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#include "common/socket.h"
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#include "common/util.h"
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#define CONTROL_UNIX_SOCKET_PATH ".awesome_ctl."
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/** Open a communication socket with awesome.
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* \param csfd The socket file descriptor.
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* \param mode The open mode, either Bind or Connect.
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* \return sockaddr_un Struct ready to be used or NULL if a problem ocurred.
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*/
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struct sockaddr_un *
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socket_open(int csfd, const socket_mode_t mode)
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{
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char *host = NULL;
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int screenp = 0, displayp = 0;
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bool is_socket_opened = false;
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ssize_t path_len, len;
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struct sockaddr_un *addr;
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const char *fallback[] = { ":HOME", ":TMPDIR", "/tmp", NULL }, *directory;
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addr = p_new(struct sockaddr_un, 1);
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addr->sun_family = AF_UNIX;
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xcb_parse_display(NULL, &host, &displayp, &screenp);
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len = a_strlen(host);
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for(int i = 0; fallback[i] && !is_socket_opened; i++)
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{
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if(fallback[i][0] == ':')
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{
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if(!(directory = getenv(fallback[i] + 1)))
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continue;
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}
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else
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directory = fallback[i];
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/* + 2 for / and . and \0 */
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path_len = snprintf(addr->sun_path, sizeof(addr->sun_path),
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"%s/" CONTROL_UNIX_SOCKET_PATH "%s%s%d",
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directory, len ? host : "", len ? "." : "",
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displayp);
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if(path_len < ssizeof(addr->sun_path))
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switch(mode)
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{
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case SOCKET_MODE_BIND:
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/* Needed for some OSes like Solaris */
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#ifndef SUN_LEN
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#define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) + strlen ((ptr)->sun_path))
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#endif
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if(!bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
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is_socket_opened = true;
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else if(errno == EADDRINUSE)
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{
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if(unlink(addr->sun_path))
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warn("error unlinking existing file: %s", strerror(errno));
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if(!bind(csfd, (const struct sockaddr *)addr, SUN_LEN(addr)))
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is_socket_opened = true;
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}
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break;
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case SOCKET_MODE_CONNECT:
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if(!connect(csfd, (const struct sockaddr *)addr, sizeof(struct sockaddr_un)))
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is_socket_opened = true;
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break;
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}
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else
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warn("error: path (using %s) of control UNIX domain socket is too long", directory);
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}
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p_delete(&host);
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if(!is_socket_opened)
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p_delete(&addr);
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return addr;
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}
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/** Get a AF_UNIX socket for communicating with awesome
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* \return the socket file descriptor
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*/
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int
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socket_getclient(void)
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{
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int csfd;
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#ifndef __FreeBSD__
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csfd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
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#else
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csfd = socket(PF_UNIX, SOCK_STREAM, 0);
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#endif
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if(csfd < 0)
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warn("error opening UNIX domain socket: %s", strerror(errno));
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fd_set_close_on_exec(csfd);
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return csfd;
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}
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// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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