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 * Return file offset. 34 * Coordinates with buffering. 35 */ 36 37 #include <sys/feature_tests.h> 38 39 #if !defined(_LP64) 40 #pragma weak _ftello64 = ftello64 41 #endif 42 #pragma weak _ftello = ftello 43 44 #include "lint.h" 45 #include "file64.h" 46 #include "mtlib.h" 47 #include <sys/types.h> 48 #include <unistd.h> 49 #include <stdio.h> 50 #include <thread.h> 51 #include <synch.h> 52 #include <errno.h> 53 #include <limits.h> 54 #include <fcntl.h> 55 #include <stddef.h> 56 #include "stdiom.h" 57 58 #if !defined(_LP64) 59 60 off64_t 61 ftello64(FILE *iop) 62 { 63 ptrdiff_t adjust; 64 off64_t tres; 65 rmutex_t *lk; 66 67 FLOCKFILE(lk, iop); 68 if (iop->_cnt < 0) 69 iop->_cnt = 0; 70 if (iop->_flag & _IOREAD) 71 adjust = (ptrdiff_t)-iop->_cnt; 72 else if (iop->_flag & (_IOWRT | _IORW)) { 73 adjust = 0; 74 if (((iop->_flag & (_IOWRT | _IONBF)) == _IOWRT) && 75 (iop->_base != 0)) 76 adjust = iop->_ptr - iop->_base; 77 } else { 78 errno = EBADF; /* file descriptor refers to no open file */ 79 FUNLOCKFILE(lk); 80 return ((off64_t)EOF); 81 } 82 tres = lseek64(FILENO(iop), 0, SEEK_CUR); 83 if (tres >= 0) 84 tres += (off64_t)adjust; 85 FUNLOCKFILE(lk); 86 return (tres); 87 } 88 89 #endif /* _LP64 */ 90 91 off_t 92 ftello(FILE *iop) 93 { 94 return ((off_t)ftell(iop)); 95 } 96