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      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)
     56 int
     57 fseeko64(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 
     92 int
     93 fseeko(FILE *iop, off_t offset, int ptrname)
     94 {
     95 	return (fseek(iop, offset, ptrname));
     96 }
     97