100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/****************************************************************************
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* drivers/syslog/syslog_emergstream.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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_force returns a negated errno value.
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*/
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ret = syslog_force(ch);
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if (ret >= 0)
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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 return value -EINTR means that syslog_force() 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 (ret == -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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