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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 #include "lint.h"
     33 #include "file64.h"
     34 #include "mtlib.h"
     35 #include <sys/types.h>
     36 #include <stdio.h>
     37 #include <unistd.h>
     38 #include <synch.h>
     39 #include <thread.h>
     40 #include "stdiom.h"
     41 #include "libc.h"
     42 
     43 
     44 void
     45 rewind(FILE *iop)
     46 {
     47 	rmutex_t *lk;
     48 
     49 	FLOCKFILE(lk, iop);
     50 	_rewind_unlocked(iop);
     51 	FUNLOCKFILE(lk);
     52 }
     53 
     54 void
     55 _rewind_unlocked(FILE *iop)
     56 {
     57 	(void) _fflush_u(iop);
     58 	(void) lseek64(FILENO(iop), 0, SEEK_SET);
     59 	iop->_cnt = 0;
     60 	iop->_ptr = iop->_base;
     61 	iop->_flag &= ~(_IOERR | _IOEOF);
     62 	if (iop->_flag & _IORW)
     63 		iop->_flag &= ~(_IOREAD | _IOWRT);
     64 }
     65