0dc2366f7b9f9f36e10909b1e95edbf2a261c2acVenugopal Iyer * CDDL HEADER START
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * The contents of this file are subject to the terms of the
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * Common Development and Distribution License, Version 1.0 only
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * (the "License"). You may not use this file except in compliance
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * with the License.
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * or http://www.opensolaris.org/os/licensing.
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * See the License for the specific language governing permissions
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * and limitations under the License.
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * When distributing Covered Code, include this CDDL HEADER in each
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * fields enclosed by brackets "[]" replaced with your own identifying
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * information: Portions Copyright [yyyy] [name of copyright owner]
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * CDDL HEADER END
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * Copyright 1989 Sun Microsystems, Inc. All rights reserved.
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * Use is subject to license terms.
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China/* Copyright (c) 1984 AT&T */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China/* All Rights Reserved */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China#pragma ident "%Z%%M% %I% %E% SMI"
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China#include <fcntl.h>
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China#include <unistd.h>
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China#include <errno.h>
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China#include <sys/syscall.h>
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China * convert lockf() into fcntl() for SystemV compatibility
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China/* New SVR4 values */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China#define SV_GETLK 5
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China#define SV_SETLK 6
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China#define SV_SETLKW 7
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing Chinalockf(int fildes, int function, long size)
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China struct flock ld;
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China cmd = SV_SETLK; /* assume non-blocking operation */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China ld.l_type = F_WRLCK; /* lockf() only deals with exclusive locks */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China ld.l_whence = 1; /* lock always starts at current position */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China ld.l_start = size;
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China ld.l_len = -size;
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China ld.l_start = 0L;
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China ld.l_len = size;
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China switch (function) {
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China if (_syscall(SYS_fcntl, fildes, SV_GETLK, &ld) != -1) {
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China if (ld.l_type == F_UNLCK) {
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China ld.l_pid = ld.l_xxx;
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China /* l_pid is the last field in the
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China SVr3 flock structure */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China errno = EACCES; /* EAGAIN ?? */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China /* the rest fall thru to the fcntl() at the end */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China ld.l_type = F_UNLCK;
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China cmd = SV_SETLKW; /* block, if not available */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China if (_syscall(SYS_fcntl, fildes, cmd, &ld) == -1) {
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China switch (errno) {
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China /* this hack is purported to be for /usr/group compatibility */
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China errno = EDEADLK;
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China ld.l_pid = ld.l_xxx; /* l_pid is the last field in the
10115c80ec7040cb0f5be39c544c4febb00369eefei feng - Sun Microsystems - Beijing China SVr3 flock structure */