1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 1997 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 28*0Sstevel@tonic-gate /* All Rights Reserved */ 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate /* 31*0Sstevel@tonic-gate * Portions of this source code were derived from Berkeley 4.3 BSD 32*0Sstevel@tonic-gate * under license from the Regents of the University of California. 33*0Sstevel@tonic-gate */ 34*0Sstevel@tonic-gate 35*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 36*0Sstevel@tonic-gate 37*0Sstevel@tonic-gate /*LINTLIBRARY*/ 38*0Sstevel@tonic-gate 39*0Sstevel@tonic-gate #include <sys/types.h> 40*0Sstevel@tonic-gate #include <sys/file.h> 41*0Sstevel@tonic-gate #include <fcntl.h> 42*0Sstevel@tonic-gate #include <errno.h> 43*0Sstevel@tonic-gate 44*0Sstevel@tonic-gate int 45*0Sstevel@tonic-gate flock(int fd, int operation) 46*0Sstevel@tonic-gate { 47*0Sstevel@tonic-gate struct flock fl; 48*0Sstevel@tonic-gate int cmd; 49*0Sstevel@tonic-gate int ret; 50*0Sstevel@tonic-gate 51*0Sstevel@tonic-gate /* initialize the flock struct to set lock on entire file */ 52*0Sstevel@tonic-gate fl.l_whence = 0; 53*0Sstevel@tonic-gate fl.l_start = 0; 54*0Sstevel@tonic-gate fl.l_len = 0; 55*0Sstevel@tonic-gate fl.l_type = 0; 56*0Sstevel@tonic-gate 57*0Sstevel@tonic-gate /* In non-blocking lock, use F_SETLK for cmd, F_SETLKW otherwise */ 58*0Sstevel@tonic-gate if (operation & LOCK_NB) { 59*0Sstevel@tonic-gate cmd = F_SETLK; 60*0Sstevel@tonic-gate operation &= ~LOCK_NB; /* turn off this bit */ 61*0Sstevel@tonic-gate } else 62*0Sstevel@tonic-gate cmd = F_SETLKW; 63*0Sstevel@tonic-gate 64*0Sstevel@tonic-gate switch (operation) { 65*0Sstevel@tonic-gate case LOCK_UN: 66*0Sstevel@tonic-gate fl.l_type |= F_UNLCK; 67*0Sstevel@tonic-gate break; 68*0Sstevel@tonic-gate case LOCK_SH: 69*0Sstevel@tonic-gate fl.l_type |= F_RDLCK; 70*0Sstevel@tonic-gate break; 71*0Sstevel@tonic-gate case LOCK_EX: 72*0Sstevel@tonic-gate fl.l_type |= F_WRLCK; 73*0Sstevel@tonic-gate break; 74*0Sstevel@tonic-gate default: 75*0Sstevel@tonic-gate errno = EINVAL; 76*0Sstevel@tonic-gate return (-1); 77*0Sstevel@tonic-gate } 78*0Sstevel@tonic-gate 79*0Sstevel@tonic-gate ret = fcntl(fd, cmd, &fl); 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate if (ret == -1 && errno == EACCES) 82*0Sstevel@tonic-gate errno = EWOULDBLOCK; 83*0Sstevel@tonic-gate 84*0Sstevel@tonic-gate return (ret); 85*0Sstevel@tonic-gate } 86