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nonblock_fcntl.c
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nonblock_fcntl.c
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/* nonblock_fcntl.c -- Set nonblocking mode using fcntl()
*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY 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.
*
* $Id: nonblock_fcntl.c,v 1.17 2010/01/06 17:01:46 murch Exp $
*/
#include <config.h>
#include <sys/types.h>
#include <sys/file.h>
#include <fcntl.h>
#include "xmalloc.h"
#include "exitcodes.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
const char *nonblock_method_desc = "fcntl";
/*
* 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", EC_IOERR);
if (mode) {
flags |= NON_BLOCKING_MODE;
}
else {
flags &= ~NON_BLOCKING_MODE;
}
fcntl(fd, F_SETFL, flags);
}

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