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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/syscall.h> 30 #include <sys/types.h> 31 32 /* The following are from SVR4 sys/fcntl.h */ 33 34 #define F_FREESP 11 /* Free file space */ 35 #define F_WRLCK 02 /* Write Lock */ 36 37 /* lock structure from SVR4. */ 38 struct fl { 39 short l_type; 40 short l_whence; 41 off_t l_start; 42 off_t l_len; 43 long l_sysid; 44 pid_t l_pid; 45 long pad[4]; 46 }; 47 48 int 49 ftruncate(int fd, off_t length) 50 { 51 52 struct fl lck; 53 54 lck.l_whence = 0; /* offset l_start from beginning of file */ 55 lck.l_start = length; 56 lck.l_type = F_WRLCK; /* setting a write lock */ 57 lck.l_len = 0L; 58 59 if (_syscall(SYS_fcntl, fd, F_FREESP, (int)&lck) == -1) 60 return (-1); 61 else 62 return (0); 63 } 64