145 lines
4.9 KiB
C
145 lines
4.9 KiB
C
/****************************************************************************
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* drivers/syslog/syslog_write.c
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*
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* Copyright (C) 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 <sys/types.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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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: syslog_default_write
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*
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* Description:
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* This provides a default write method for syslog devices that do not
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* support multiple byte writes This functions simply loops, outputting
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* one character at a time.
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*
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* Input Parameters:
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* buffer - The buffer containing the data to be output
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* buflen - The number of bytes in the buffer
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*
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* Returned Value:
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* On success, the number of characters written is returned. 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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static ssize_t syslog_default_write(FAR const char *buffer, size_t buflen)
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{
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size_t nwritten;
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if (up_interrupt_context() || sched_idletask())
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{
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for (nwritten = 0; nwritten < buflen; nwritten++)
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{
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#ifdef CONFIG_SYSLOG_INTBUFFER
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if (up_interrupt_context())
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{
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syslog_add_intbuffer(*buffer++);
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}
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else
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#endif
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{
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DEBUGASSERT(g_syslog_channel->sc_force != NULL);
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g_syslog_channel->sc_force(*buffer++);
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}
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}
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}
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#ifdef CONFIG_SYSLOG_WRITE
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else if (g_syslog_channel->sc_write)
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{
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nwritten = g_syslog_channel->sc_write(buffer, buflen);
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}
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#endif
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else
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{
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for (nwritten = 0; nwritten < buflen; nwritten++)
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{
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DEBUGASSERT(g_syslog_channel->sc_putc != NULL);
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g_syslog_channel->sc_putc(*buffer++);
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}
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}
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return buflen;
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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: syslog_write
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*
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* Description:
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* This is the low-level, multiple character, system logging interface.
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*
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* Input Parameters:
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* buffer - The buffer containing the data to be output
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* buflen - The number of bytes in the buffer
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*
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* Returned Value:
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* On success, the number of characters written is returned. 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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ssize_t syslog_write(FAR const char *buffer, size_t buflen)
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{
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#ifdef CONFIG_SYSLOG_INTBUFFER
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if (!up_interrupt_context() && !sched_idletask())
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{
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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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}
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#endif
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return syslog_default_write(buffer, buflen);
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}
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