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nonblock_fcntl.c
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/* nonblock_fcntl.c -- Set nonblocking mode using fcntl()
$Id: nonblock_fcntl.c,v 1.6 1998/05/15 21:52:34 neplokh Exp $
# Copyright 1998 by Carnegie Mellon University
#
# All Rights Reserved
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose and without fee is hereby granted,
# provided that the above copyright notice appear in all copies and that
# both that copyright notice and this permission notice appear in
# supporting documentation, and that the name of CMU not be
# used in advertising or publicity pertaining to distribution of the
# software without specific, written prior permission.
#
# CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
# CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
# ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
# SOFTWARE.
*
*/
#include <sys/types.h>
#include <sys/file.h>
#include <fcntl.h>
#include "nonblock.h"
#ifndef FNDELAY
#define FNDELAY O_NDELAY
#endif
#ifdef O_NONBLOCK
#define NON_BLOCKING_MODE O_NONBLOCK
#else
#define NON_BLOCKING_MODE FNDELAY
#endif
/*
* Modifies the non-blocking mode on the file descriptor 'fd'. If
* 'mode' is nonzero, sets non-blocking mode, if 'mode' is zero
* clears non-blocking mode.
*/
void
nonblock(fd, mode)
int fd;
int mode;
{
int flags;
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) fatal("Internal error: fcntl F_GETFL failed");
if (mode) {
flags |= NON_BLOCKING_MODE;
}
else {
flags &= ~NON_BLOCKING_MODE;
}
fcntl(fd, F_SETFL, flags);
}

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