libcsupport/src/open_dev_console.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  * @brief open_dev_console - open /dev/console
0006  */
0007
0008 /*
0009  *  COPYRIGHT (c) 1989-2009.
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 <rtems.h>
0039 #include <rtems/libio.h>
0040 #include <rtems/console.h>
0041 #include <fcntl.h>
0042 #include <stdlib.h>
0043 #include <unistd.h>
0044
0045 /*
0046  *  This is a replaceable stub which opens the console, if present.
0047  */
0048 void rtems_libio_post_driver(void)
0049 {
0050   /*
0051    * Attempt to open /dev/console.
0052    */
0053   if ( open( CONSOLE_DEVICE_NAME, O_RDONLY, 0 ) != STDIN_FILENO ) {
0054     /*
0055      * There may not be a console driver so this is OK.
0056      */
0057     return;
0058   }
0059
0060   /*
0061    *  But if we find /dev/console once, we better find it twice more
0062    *  or something is REALLY wrong.
0063    */
0064   if ( open( CONSOLE_DEVICE_NAME, O_WRONLY, 0 ) != STDOUT_FILENO ) {
0065     _Internal_error( INTERNAL_ERROR_LIBIO_STDOUT_FD_OPEN_FAILED );
0066   }
0067
0068   if ( open( CONSOLE_DEVICE_NAME, O_WRONLY, 0 ) != STDERR_FILENO ) {
0069     _Internal_error( INTERNAL_ERROR_LIBIO_STDERR_FD_OPEN_FAILED );
0070   }
0071
0072   atexit(rtems_libio_exit);
0073 }
0074