115 lines
4.0 KiB
C
115 lines
4.0 KiB
C
/****************************************************************************
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* drivers/syslog/syslog_emergtream.c
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*
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* Copyright (C) 2016-2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/syslog/syslog.h>
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#include <nuttx/streams.h>
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#include "syslog.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: emergstream_putc
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****************************************************************************/
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static void emergstream_putc(FAR struct lib_outstream_s *this, int ch)
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{
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int ret;
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/* Try writing until the write was successful or until an irrecoverable
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* error occurs.
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*/
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do
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{
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/* Write the character to the supported logging device. On failure,
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* syslog_putc returns EOF with the errno value set;
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*/
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ret = syslog_force(ch);
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if (ret != EOF)
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{
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this->nput++;
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return;
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}
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/* The special errno value -EINTR means that syslog_putc() was
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* awakened by a signal. This is not a real error and must be
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* ignored in this context.
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*/
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}
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while (errno == -EINTR);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: emergstream
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*
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* Description:
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* Initializes a stream for use with the configured emergency syslog
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* interface. Only accessible from with the OS SYSLOG logic.
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*
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* Input Parameters:
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* stream - User allocated, uninitialized instance of struct
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* lib_outstream_s to be initialized.
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*
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* Returned Value:
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* None (User allocated instance initialized).
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*
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****************************************************************************/
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void emergstream(FAR struct lib_outstream_s *stream)
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{
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stream->put = emergstream_putc;
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stream->flush = lib_noflush;
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stream->nput = 0;
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}
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