/* nonblock_fcntl.c -- Set nonblocking mode using fcntl() * $Id: nonblock_fcntl.c,v 1.5 2005/03/05 00:37:17 dasenbro Exp $ * * Copyright (c) 1998-2003 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 other legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@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. * * */ #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); }