1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1987 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 /* from UCB 4.2 83/05/31 */ 29 30 #include <sys/types.h> 31 #include <sys/time.h> 32 33 extern long time(); 34 35 /* 36 * Backwards compatible utime. 37 * 38 * The System V system call allows any user with write permission 39 * on a file to set the accessed and modified times to the current 40 * time; they specify this by passing a null pointer to "utime". 41 * This is done to simulate reading one byte from a file and 42 * overwriting that byte with itself, which is the technique used 43 * by older versions of the "touch" command. The advantage of this 44 * hack in the system call is that it works correctly even if the file 45 * is zero-length. 46 * 47 * The BSD system call never allowed a null pointer so there should 48 * be no compatibility problem there. 49 */ 50 utime(name, otv) 51 char *name; 52 time_t otv[2]; 53 { 54 struct timeval tv[2]; 55 56 if (otv == 0) { 57 return (utimes(name, (struct timeval *)0)); 58 } else { 59 tv[0].tv_sec = (long)otv[0]; 60 tv[0].tv_usec = 0; 61 tv[1].tv_sec = (long)otv[1]; 62 tv[1].tv_usec = 0; 63 } 64 return (utimes(name, tv)); 65 } 66