6a3c2aded6
* Simplify EINTR/ECANCEL error handling 1. Add semaphore uninterruptible wait function 2 .Replace semaphore wait loop with a single uninterruptible wait 3. Replace all sem_xxx to nxsem_xxx * Unify the void cast usage 1. Remove void cast for function because many place ignore the returned value witout cast 2. Replace void cast for variable with UNUSED macro
116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
/****************************************************************************
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* drivers/syslog/syslog_putc.c
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*
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* Copyright (C) 2016 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 <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. The interrupt buffer
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* will be flushed before the next normal, 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 (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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