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https://gitlab.rtems.org/rtems/rtos/rtems.git
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d8ba01ec52
If someone manages to open a file before rtems_libio_post_driver is run, open() may allocate a file number other than 0 for stdin. This leads to a silent failure of the logic in rtems_libio_post_driver, and confusing behavior because your BSP behaves as if it doesn't have a console. Instead of failing silently, raise an internal error if open() succeeds but gives us an unexpected file number for stdin.
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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* @brief open_dev_console - open /dev/console
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*/
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/*
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* COPYRIGHT (c) 1989-2009.
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* On-Line Applications Research Corporation (OAR).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems.h>
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#include <rtems/libio.h>
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#include <rtems/console.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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/*
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* This is a replaceable stub which opens the console, if present.
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*/
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void rtems_libio_post_driver(void)
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{
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int fd = 0;
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/*
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* Attempt to open /dev/console.
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*/
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if ( ( fd = open( CONSOLE_DEVICE_NAME, O_RDONLY, 0 ) ) != STDIN_FILENO ) {
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/*
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* There may not be a console driver so this is OK.
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*/
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if ( fd < 0 ) {
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return;
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}
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/*
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* If open succeeds, but doesn't give us the stdin fileno we expect, bail out...
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*/
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_Internal_error( INTERNAL_ERROR_LIBIO_STDIN_FD_OPEN_FAILED );
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}
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/*
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* But if we find /dev/console once, we better find it twice more
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* or something is REALLY wrong.
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*/
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if ( open( CONSOLE_DEVICE_NAME, O_WRONLY, 0 ) != STDOUT_FILENO ) {
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_Internal_error( INTERNAL_ERROR_LIBIO_STDOUT_FD_OPEN_FAILED );
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}
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if ( open( CONSOLE_DEVICE_NAME, O_WRONLY, 0 ) != STDERR_FILENO ) {
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_Internal_error( INTERNAL_ERROR_LIBIO_STDERR_FD_OPEN_FAILED );
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}
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atexit(rtems_libio_exit);
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}
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