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#include <sys/feature_tests.h>
37
38#if !defined(_LP64)
39#pragma weak _fseeko64 = fseeko64
40#endif
41#pragma weak _fseeko = fseeko
42
43#include "lint.h"
44#include "file64.h"
45#include "mtlib.h"
46#include <sys/types.h>
47#include <unistd.h>
48#include <limits.h>
49#include <stdio.h>
50#include <errno.h>
51#include <thread.h>
52#include <synch.h>
53#include "stdiom.h"
54
55#if !defined(_LP64)
56int
57fseeko64(FILE *iop, off64_t offset, int ptrname)
58{
59	off64_t	p;
60	rmutex_t *lk;
61
62	FLOCKFILE(lk, iop);
63	iop->_flag &= ~_IOEOF;
64
65	if (!(iop->_flag & _IOREAD) && !(iop->_flag & (_IOWRT | _IORW))) {
66		errno = EBADF;
67		FUNLOCKFILE(lk);
68		return (-1);
69	}
70
71	if (iop->_flag & _IOREAD) {
72		if (ptrname == 1 && iop->_base && !(iop->_flag&_IONBF)) {
73			offset -= iop->_cnt;
74		}
75	} else if (iop->_flag & (_IOWRT | _IORW)) {
76		if (_fflush_u(iop) == EOF) {
77			FUNLOCKFILE(lk);
78			return (-1);
79		}
80	}
81	iop->_cnt = 0;
82	iop->_ptr = iop->_base;
83	if (iop->_flag & _IORW) {
84		iop->_flag &= ~(_IOREAD | _IOWRT);
85	}
86	p = lseek64(FILENO(iop), offset, ptrname);
87	FUNLOCKFILE(lk);
88	return ((p == -1)? -1: 0);
89}
90#endif	/* _LP64 */
91
92int
93fseeko(FILE *iop, off_t offset, int ptrname)
94{
95	return (fseek(iop, offset, ptrname));
96}
97