libcsupport/src/lseek.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  * @brief lseek() - POSIX 1003.1b 6.5.3 - Reposition Read/Write File Offset
0006  */
0007
0008 /*
0009  *  COPYRIGHT (c) 1989-1999.
0010  *  On-Line Applications Research Corporation (OAR).
0011  *
0012  * Redistribution and use in source and binary forms, with or without
0013  * modification, are permitted provided that the following conditions
0014  * are met:
0015  * 1. Redistributions of source code must retain the above copyright
0016  *    notice, this list of conditions and the following disclaimer.
0017  * 2. Redistributions in binary form must reproduce the above copyright
0018  *    notice, this list of conditions and the following disclaimer in the
0019  *    documentation and/or other materials provided with the distribution.
0020  *
0021  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0022  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0023  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0024  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0025  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0026  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0027  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0028  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0029  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0030  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0031  * POSSIBILITY OF SUCH DAMAGE.
0032  */
0033
0034 #ifdef HAVE_CONFIG_H
0035 #include "config.h"
0036 #endif
0037
0038 #include <unistd.h>
0039
0040 #include <rtems/libio_.h>
0041
0042 off_t lseek( int fd, off_t offset, int whence )
0043 {
0044   rtems_libio_t *iop;
0045   off_t          rv;
0046
0047   LIBIO_GET_IOP( fd, iop );
0048
0049   rv = (*iop->pathinfo.handlers->lseek_h)( iop, offset, whence );
0050   rtems_libio_iop_drop( iop );
0051   return rv;
0052 }
0053
0054 /*
0055  *  _lseek_r
0056  *
0057  *  This is the Newlib dependent reentrant version of lseek().
0058  */
0059
0060 #if defined(RTEMS_NEWLIB) && !defined(HAVE__LSEEK_R)
0061
0062 #include <reent.h>
0063
0064 off_t _lseek_r(
0065   struct _reent *ptr RTEMS_UNUSED,
0066   int            fd,
0067   off_t          offset,
0068   int            whence
0069 )
0070 {
0071   return lseek( fd, offset, whence );
0072 }
0073 #endif