listen.c

来自「一款类linux的操作系统源码」· C语言 代码 · 共 59 行

/*
 *  Roadrunner/pk
 *    Copyright (C) 1989-2002  Cornfed Systems, Inc.
 *
 *  The Roadrunner/pk operating system is free software; you can
 *  redistribute and/or modify it under the terms of the GNU General
 *  Public License, version 2, as published by the Free Software
 *  Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT 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
 *
 *  More information about the Roadrunner/pk operating system of
 *  which this file is a part is available on the World-Wide Web
 *  at: http://www.cornfed.com.
 *
 */

#include <errno.h>
#include <fs.h>
#if _DEBUG
#include <stdio.h>
#endif
#include <sys/socket.h>

int
listen(int s, int backlog)
{
    socket_t socket;

    if (s < 0 || s >= FILES)
	return EINVAL;

    if (filetab[s].type != FT_SOCKET)
	return ENOTSOCK;

    if (backlog < 0)
	return EINVAL;

    socket = (socket_t) filetab[s].data;
    if (socket->state != SS_BOUND) {
#if _DEBUG
	kprintf("listen: socket not bound\n");
#endif
	return EBADF;
    }
    socket->state = SS_LISTEN;
    socket->backlog = backlog;

    return 0;
}