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/****************************************************************************
* lib/stdio/lib_perror.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <errno.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* POSIX requires that perror provide its output on stderr. This option may
* be defined, however, to provide perror output that is serialized with
* other stdout messages.
*/
#ifdef CONFIG_LIBC_PERROR_STDOUT
# define PERROR_STREAM stdout
# undef CONFIG_LIBC_PERROR_DEVNAME
#endif
/* Another non-standard option is to provide perror output to a logging
* device or file. CONFIG_LIBC_PERROR_DEVNAME may be defined to be any write-
* able, character device (or file).
*/
#ifndef CONFIG_LIBC_PERROR_DEVNAME
# define PERROR_STREAM stderr
#else
# define PERROR_STREAM perror_stream;
#endif
/****************************************************************************
* Private Type Declarations
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
#ifndef CONFIG_LIBC_PERROR_DEVNAME
static FILE *perror_stream;
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: perror
****************************************************************************/
void perror(FAR const char *s)
{
/* If we are using a custom output device (something other than
* /dev/console), then make sure that the device has been opened.
*/
#ifdef CONFIG_LIBC_PERROR_DEVNAME
if (!perror_stream)
{
/* Not yet.. open it now */
perror_stream = fopen(CONFIG_LIBC_PERROR_DEVNAME, "w");
if (!perror_stream)
{
/* Oops... we couldn't open the device */
return;
}
}
#endif
/* If strerror() is not enabled, then just print the error number */
#ifdef CONFIG_LIBC_STRERROR
(void)fprintf(PERROR_STREAM, "%s: %s\n", s, strerror(errno));
#else
(void)fprintf(PERROR_STREAM, "%s: Error %d\n", s, errno);
#endif
}
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