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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [libgloss/] [or32/] [lseek.c] - Blame information for rev 507

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Line No. Rev Author Line
1 207 jeremybenn
/* lseek-uart.c. Implementation of the _lseek syscall for newlib with UART
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   Copyright (C) 2004, Jacob Bower
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   Copyright (C) 2010, Embecosm Limited <info@embecosm.com>
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   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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   This file is part of Newlib.
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   The original work by Jacob Bower is provided as-is without any kind of
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   warranty. Use it at your own risk!
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   All subsequent work is bound by version 3 of the GPL as follows.
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   This program is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by the Free
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   Software Foundation; either version 3 of the License, or (at your option)
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   any later version.
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   This program is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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   more details.
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   You should have received a copy of the GNU General Public License along
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   with this program.  If not, see <http:#www.gnu.org/licenses/>.             */
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/* -------------------------------------------------------------------------- */
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/* This program is commented throughout in a fashion suitable for processing
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   with Doxygen.                                                              */
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/* -------------------------------------------------------------------------- */
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#include <errno.h>
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#include <unistd.h>
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#include "or1k-support.h"
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#undef errno
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extern int  errno;
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/* -------------------------------------------------------------------------- */
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/*!Set a position in a file when using a UART.
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   We only support stdin, stdout and stderr for which positioning is always to
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   offset 0.
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   Remember that this function is *not* reentrant, so no static state should
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   be held.
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   @param[in] file    The fileno to lseek.
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   @param[in] offset  The desired offset.
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   @param[in] whence  Where to lseek from.
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   @return  0, indicating the offset achieved.                                */
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/* -------------------------------------------------------------------------- */
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int
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_lseek (int   file,
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        int   offset,
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        int   whence)
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{
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  if ((BOARD_HAS_UART && (STDIN_FILENO  == file)) ||
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      (STDOUT_FILENO == file) ||
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      (STDERR_FILENO == file))
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    {
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      return  0;
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    }
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  else
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    {
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      errno = EBADF;
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      return (long) -1;
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    }
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}       /* _lseek () */

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