103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/****************************************************************************
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* drivers/syslog/syslog_putc.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 <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include <nuttx/sched.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_putc
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*
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* Description:
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* This is the low-level system logging interface.
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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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* On success, the character is echoed back to the caller. A negated
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* errno value is returned on any failure.
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*
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****************************************************************************/
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int syslog_putc(int ch)
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{
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DEBUGASSERT(g_syslog_channel != NULL);
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/* Is this an attempt to do SYSLOG output from an interrupt handler? */
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if (up_interrupt_context() || sched_idletask())
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{
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#if defined(CONFIG_SYSLOG_INTBUFFER)
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if (up_interrupt_context())
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{
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/* Buffer the character in the interrupt buffer.
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* The interrupt buffer will be flushed before the next normal,
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* non-interrupt SYSLOG output.
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*/
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return syslog_add_intbuffer(ch);
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}
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else
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#endif
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{
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/* Force the character to the SYSLOG device immediately
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* (if possible).
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* This means that the interrupt data may not be in synchronization
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* with output data that may have been buffered by sc_putc().
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*/
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DEBUGASSERT(g_syslog_channel->sc_force != NULL);
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return g_syslog_channel->sc_force(ch);
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}
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}
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else
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{
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DEBUGASSERT(g_syslog_channel->sc_putc != NULL);
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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(g_syslog_channel, false);
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#endif
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return g_syslog_channel->sc_putc(ch);
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}
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}
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