/*- * Copyright (c) 1997 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Klaus Klein. * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* $NetBSD: lockf.c,v 1.1 1997/12/20 20:23:18 kleink Exp $ */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: src/lib/libc/gen/lockf.c,v 1.8 2002/02/01 00:57:29 obrien Exp $"); #include "namespace.h" #include <errno.h> #include <fcntl.h> #include <unistd.h> #include "un-namespace.h" int lockf(filedes, function, size) int filedes; int function; off_t size; { struct flock fl; int cmd; fl.l_start = 0; fl.l_len = size; fl.l_whence = SEEK_CUR; switch (function) { case F_ULOCK: cmd = F_SETLK; fl.l_type = F_UNLCK; break; case F_LOCK: cmd = F_SETLKW; fl.l_type = F_WRLCK; break; case F_TLOCK: cmd = F_SETLK; fl.l_type = F_WRLCK; break; case F_TEST: fl.l_type = F_WRLCK; if (_fcntl(filedes, F_GETLK, &fl) == -1) return (-1); if (fl.l_type == F_UNLCK || fl.l_pid == getpid()) return (0); errno = EAGAIN; return (-1); /* NOTREACHED */ default: errno = EINVAL; return (-1); /* NOTREACHED */ } return (_fcntl(filedes, cmd, &fl)); }