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 2004 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 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 /* 34 * Seek for standard library. Coordinates with buffering. 35 */ 36 37 #pragma weak fseek = _fseek 38 39 #include "synonyms.h" 40 #include "file64.h" 41 #include "mtlib.h" 42 #include <stdio.h> 43 #include <errno.h> 44 #include <thread.h> 45 #include <synch.h> 46 #include <unistd.h> 47 #include <sys/types.h> 48 #include "stdiom.h" 49 50 int 51 fseek(FILE *iop, long offset, int ptrname) 52 { 53 off_t p; 54 rmutex_t *lk; 55 56 FLOCKFILE(lk, iop); 57 iop->_flag &= ~_IOEOF; 58 59 if (!(iop->_flag & _IOREAD) && !(iop->_flag & (_IOWRT | _IORW))) { 60 errno = EBADF; 61 FUNLOCKFILE(lk); 62 return (-1); 63 } 64 65 if (iop->_flag & _IOREAD) { 66 if (ptrname == 1 && iop->_base && !(iop->_flag&_IONBF)) { 67 offset -= iop->_cnt; 68 } 69 } else if (iop->_flag & (_IOWRT | _IORW)) { 70 if (_fflush_u(iop) == EOF) { 71 FUNLOCKFILE(lk); 72 return (-1); 73 } 74 } 75 iop->_cnt = 0; 76 iop->_ptr = iop->_base; 77 if (iop->_flag & _IORW) { 78 iop->_flag &= ~(_IOREAD | _IOWRT); 79 } 80 p = lseek(FILENO(iop), (off_t)offset, ptrname); 81 FUNLOCKFILE(lk); 82 return ((p == (off_t)-1) ? -1: 0); 83 } 84