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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [libgloss/] [or32/] [lseek-uart.c] - Rev 280
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/* lseek-uart.c. Implementation of the _lseek syscall for newlib with UART Copyright (C) 2004, Jacob Bower Copyright (C) 2010, Embecosm Limited <info@embecosm.com> Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> This file is part of Newlib. The original work by Jacob Bower is provided as-is without any kind of warranty. Use it at your own risk! All subsequent work is bound by version 3 of the GPL as follows. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http:#www.gnu.org/licenses/>. */ /* -------------------------------------------------------------------------- */ /* This program is commented throughout in a fashion suitable for processing with Doxygen. */ /* -------------------------------------------------------------------------- */ #include <errno.h> #include <unistd.h> #undef errno extern int errno; /* -------------------------------------------------------------------------- */ /*!Set a position in a file when using a UART. We only support stdin, stdout and stderr for which positioning is always to offset 0. Remember that this function is *not* reentrant, so no static state should be held. @param[in] file The fileno to lseek. @param[in] offset The desired offset. @param[in] whence Where to lseek from. @return 0, indicating the offset achieved. */ /* -------------------------------------------------------------------------- */ int _lseek (int file, int offset, int whence) { if ((STDIN_FILENO == file) || (STDOUT_FILENO == file) || (STDERR_FILENO == file)) { return 0; } else { errno = EBADF; return (long) -1; } } /* _lseek () */
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