avahi-0.6.31/avahi-core/fdutil.c

/***
  This file is part of avahi.

  avahi is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation; either version 2.1 of the
  License, or (at your option) any later version.

  avahi 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 Lesser General
  Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with avahi; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <sys/select.h>
#include <unistd.h>
#include <fcntl.h>
#include <assert.h>

#include "fdutil.h"

int avahi_set_cloexec(int fd) {
    int n;

    assert(fd >= 0);

    if ((n = fcntl(fd, F_GETFD)) < 0)
        return -1;

    if (n & FD_CLOEXEC)
        return 0;

    return fcntl(fd, F_SETFD, n|FD_CLOEXEC);
}

int avahi_set_nonblock(int fd) {
    int n;

    assert(fd >= 0);

    if ((n = fcntl(fd, F_GETFL)) < 0)
        return -1;

    if (n & O_NONBLOCK)
        return 0;

    return fcntl(fd, F_SETFL, n|O_NONBLOCK);
}

int avahi_wait_for_write(int fd) {
    fd_set fds;
    int r;

    FD_ZERO(&fds);
    FD_SET(fd, &fds);

    if ((r = select(fd+1, NULL, &fds, NULL, NULL)) < 0)
        return -1;

    assert(r > 0);

    return 0;
}