efd1b838e6
It is used to write the log message to the channel immediately when the log message is generated in the interrupt context, which is faster than the normal force callback. Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/****************************************************************************
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* drivers/syslog/syslog_flush.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 <stdbool.h>
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#include <assert.h>
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#include <nuttx/syslog/syslog.h>
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#include "syslog.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: syslog_flush
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*
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* Description:
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* This is called by system crash-handling logic. It must flush any
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* buffered data to the SYSLOG device.
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*
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* Interrupts are disabled at the time of the crash and this logic must
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* perform the flush using low-level, non-interrupt driven logic.
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*
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* REVISIT: There is an implementation problem in that if a character
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* driver is the underlying device, then there is no mechanism to flush
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* the data buffered in the driver with interrupts disabled.
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*
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* Currently, this function on (a) dumps the interrupt buffer (if the
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* SYSLOG interrupt buffer is enabled), and (b) only the SYSLOG interface
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* supports supports the 'sc_force()' method.
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*
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* Input Parameters:
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* ch - The character to add to the SYSLOG (must be positive).
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*
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* Returned Value:
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* Zero (OK)is returned on success. A negated errno value is returned
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* on any failure.
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*
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****************************************************************************/
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int syslog_flush(void)
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{
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int i;
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#ifdef CONFIG_SYSLOG_INTBUFFER
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/* Flush any characters that may have been added to the interrupt
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* buffer.
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*/
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syslog_flush_intbuffer(true);
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#endif
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for (i = 0; i < CONFIG_SYSLOG_MAX_CHANNELS; i++)
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{
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FAR struct syslog_channel_s *channel = g_syslog_channel[i];
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if (channel == NULL)
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{
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break;
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}
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/* Then flush all of the buffered output to the SYSLOG device */
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if (channel->sc_ops->sc_flush != NULL)
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{
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channel->sc_ops->sc_flush(channel);
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}
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}
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return OK;
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}
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