src/dnonblock.c

/*
 * This file is part of libdaemon.
 *
 * libdaemon 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.
 *
 * libdaemon 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 libdaemon; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 */

#include <fcntl.h>

#include "dnonblock.h"

int daemon_nonblock(int fd, int b) {
    int a;
    if ((a = fcntl(fd, F_GETFL)) < 0)
        return -1;

    if (b)
        a |= O_NDELAY;
    else
        a &= ~O_NDELAY;

    if (fcntl(fd, F_SETFL, a) < 0)
        return -1;

    return 0;
}