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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * Seek for standard library. Coordinates with buffering. 34 */ 35 36 #pragma weak _fseek = fseek 37 38 #include "lint.h" 39 #include "file64.h" 40 #include "mtlib.h" 41 #include <stdio.h> 42 #include <errno.h> 43 #include <thread.h> 44 #include <synch.h> 45 #include <unistd.h> 46 #include <sys/types.h> 47 #include "stdiom.h" 48 49 int 50 fseek(FILE *iop, long offset, int ptrname) 51 { 52 off_t p; 53 rmutex_t *lk; 54 55 FLOCKFILE(lk, iop); 56 iop->_flag &= ~_IOEOF; 57 58 if (!(iop->_flag & _IOREAD) && !(iop->_flag & (_IOWRT | _IORW))) { 59 errno = EBADF; 60 FUNLOCKFILE(lk); 61 return (-1); 62 } 63 64 if (iop->_flag & _IOREAD) { 65 if (ptrname == 1 && iop->_base && !(iop->_flag&_IONBF)) { 66 offset -= iop->_cnt; 67 } 68 } else if (iop->_flag & (_IOWRT | _IORW)) { 69 if (_fflush_u(iop) == EOF) { 70 FUNLOCKFILE(lk); 71 return (-1); 72 } 73 } 74 iop->_cnt = 0; 75 iop->_ptr = iop->_base; 76 if (iop->_flag & _IORW) { 77 iop->_flag &= ~(_IOREAD | _IOWRT); 78 } 79 p = lseek(FILENO(iop), (off_t)offset, ptrname); 80 FUNLOCKFILE(lk); 81 return ((p == (off_t)-1) ? -1: 0); 82 } 83