/*** $Id: servlisten.c,v 1.7 2003/09/04 06:02:53 weiym Exp $** ** servlisten.c: Create listen socket for server.**               Create a server endpoint of a connection.** ** Copyright (C) 2003 Feynman Software** Copyright (C) 2000 ~ 2002 Wei Yongming.**** Current maintainer: Wei Yongming.**** Create date: 2000/12/20**** NOTE: The idea comes from sample code in APUE.*//*** This program is free software; you can redistribute it and/or modify** it under the terms of the GNU General Public License as published by** the Free Software Foundation; either version 2 of the License, or** (at your option) any later version.**** This program is distributed in the hope that it will be useful,** but WITHOUT ANY WARRANTY; without even the implied warranty of** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the** GNU General Public License for more details.**** You should have received a copy of the GNU General Public License** along with this program; if not, write to the Free Software** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*//*** TODO:*/#include <sys/types.h>#include <sys/stat.h>#include <sys/socket.h>#include <sys/fcntl.h>#include <sys/un.h>#include <string.h>#include <unistd.h>/* returns fd if all OK, -1 on error */int serv_listen (const char *name){    int    fd, len;    struct sockaddr_un unix_addr;    /* create a Unix domain stream socket */    if ( (fd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)        return (-1);    fcntl( fd, F_SETFD, FD_CLOEXEC );    /* in case it already exists */    unlink (name);    /* fill in socket address structure */    memset (&unix_addr, 0, sizeof(unix_addr));    unix_addr.sun_family = AF_UNIX;    strcpy (unix_addr.sun_path, name);    len = sizeof (unix_addr.sun_family) + strlen (unix_addr.sun_path);    /* bind the name to the descriptor */    if (bind (fd, (struct sockaddr *) &unix_addr, len) < 0)        goto error;    if (chmod (name, 0666) < 0)        goto error;    /* tell kernel we're a server */    if (listen (fd, 5) < 0)        goto error;    return (fd);error:    close (fd);    return (-1);}