servlisten.c

ARM9-2410教学实验系统下Linux下minigui程序

/*
** $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);
}