347 lines
11 KiB
C
347 lines
11 KiB
C
/****************************************************************************
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* drivers/syslog/syslog.h
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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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#ifndef __DRIVERS_SYSLOG_SYSLOG_H
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#define __DRIVERS_SYSLOG_SYSLOG_H
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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 <nuttx/streams.h>
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#include <stdbool.h>
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This is a special stream that does buffered character I/O. NOTE that is
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* CONFIG_SYSLOG_BUFFER is not defined, it is the same as struct
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* lib_outstream_s
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*/
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struct iob_s; /* Forward reference */
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struct lib_syslogstream_s
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{
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struct lib_outstream_s public;
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#ifdef CONFIG_SYSLOG_BUFFER
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FAR struct iob_s *iob;
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#endif
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/* This is the current syslog channel in use. It initially points to
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* g_default_channel.
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*/
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struct syslog_channel_s; /* Forward reference */
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EXTERN FAR struct syslog_channel_s *g_syslog_channel
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[CONFIG_SYSLOG_MAX_CHANNELS];
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: syslog_dev_initialize
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*
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* Description:
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* Initialize to use the character device (or file) at
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* CONFIG_SYSLOG_DEVPATH as the SYSLOG sink.
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*
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* One power up, the SYSLOG facility is non-existent or limited to very
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* low-level output. This function may be called later in the
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* initialization sequence after full driver support has been initialized.
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* (via syslog_initialize()) It installs the configured SYSLOG drivers
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* and enables full SYSLOGing capability.
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*
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* NOTE that this implementation excludes using a network connection as
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* SYSLOG device. That would be a good extension.
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*
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* Input Parameters:
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* devpath - The full path to the character device to be used.
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* oflags - File open flags.
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* mode - File open mode (only if oflags include O_CREAT).
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*
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* Returned Value:
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* Returns a newly created SYSLOG channel, or NULL in case of any failure.
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*
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****************************************************************************/
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FAR struct syslog_channel_s *syslog_dev_initialize(FAR const char *devpath,
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int oflags, int mode);
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/****************************************************************************
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* Name: syslog_dev_uninitialize
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*
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* Description:
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* Called to disable the last device/file channel in preparation to use
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* a different SYSLOG device. Currently only used for CONFIG_SYSLOG_FILE.
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*
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* Input Parameters:
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* channel - Handle to syslog channel to be used.
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*
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* Assumptions:
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* The caller has already switched the SYSLOG source to some safe channel
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* (the default channel).
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*
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****************************************************************************/
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void syslog_dev_uninitialize(FAR struct syslog_channel_s *channel);
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/****************************************************************************
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* Name: syslog_dev_channel
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*
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* Description:
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* Configure to use the character device (or file) at
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* CONFIG_SYSLOG_DEVPATH as the SYSLOG channel.
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*
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* This tiny function is simply a wrapper around syslog_dev_initialize()
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* and syslog_channel(). It calls syslog_dev_initialize() to configure
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* the character device at CONFIG_SYSLOG_DEVPATH then calls
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* syslog_channel() to use that device as the SYSLOG output channel.
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*
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* NOTE interrupt level SYSLOG output will be lost in this case unless
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* the interrupt buffer is used.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* A pointer to the new SYSLOG channel; NULL is returned on any failure.
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*
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****************************************************************************/
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#ifdef CONFIG_SYSLOG_CHAR
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FAR struct syslog_channel_s *syslog_dev_channel(void);
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#endif
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/****************************************************************************
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* Name: syslog_console_channel
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*
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* Description:
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* Configure to use the character device (or file) at /dev/console as the
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* SYSLOG channel.
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*
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* This tiny function is simply a wrapper around syslog_dev_initialize()
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* and syslog_channel(). It calls syslog_dev_initialize() to configure
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* the character device at /dev/console then calls syslog_channel() to
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* use that device as the SYSLOG output channel.
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*
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* NOTE interrupt level SYSLOG output will be lost in the general case
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* unless the interrupt buffer is used. As a special case: If the serial
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* console is used and the architecture provides up_putc(), the interrupt
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* level output will be directed to up_putc() is the interrupt buffer is
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* disabled.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* A pointer to the new SYSLOG channel; NULL is returned on any failure.
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*
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****************************************************************************/
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#ifdef CONFIG_SYSLOG_CONSOLE
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FAR struct syslog_channel_s *syslog_console_channel(void);
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#endif
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/****************************************************************************
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* Name: syslog_register
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*
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* Description:
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* Register a simple character driver at /dev/log whose write() method
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* will transfer data to the SYSLOG device. This can be useful if, for
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* example, you want to redirect the output of a program to the SYSLOG.
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*
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* NOTE that unlike other syslog output, this data is unformatted raw
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* byte output with no time-stamping or any other SYSLOG features
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* supported.
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*
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****************************************************************************/
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#ifdef CONFIG_SYSLOG_CHARDEV
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void syslog_register(void);
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#endif
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/****************************************************************************
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* Name: syslog_add_intbuffer
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*
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* Description:
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* Add one more character to the interrupt buffer. In the event of
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* buffer overflowed, the character will be dropped. The indication
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* "[truncated]\n" will be appended to the end of the interrupt buffer.
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*
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* Input Parameters:
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* ch - The character to add to the interrupt buffer (must be positive).
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*
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* Returned Value:
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* Zero 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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* Assumptions:
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* Called only from interrupt handling logic; Interrupts will be disabled.
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*
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****************************************************************************/
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#ifdef CONFIG_SYSLOG_INTBUFFER
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int syslog_add_intbuffer(int ch);
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#endif
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/****************************************************************************
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* Name: syslog_flush_intbuffer
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*
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* Description:
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* Flush any characters that may have been added to the interrupt buffer
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* to the SYSLOG device.
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*
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* Input Parameters:
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* force - Use the force() method of the channel vs. the putc() method.
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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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* Assumptions:
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* Interrupts may or may not be disabled.
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*
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****************************************************************************/
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#ifdef CONFIG_SYSLOG_INTBUFFER
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int syslog_flush_intbuffer(bool force);
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#endif
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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, single character, 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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* 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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* Name: syslog_force
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*
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* Description:
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* This is the low-level system logging interface. This version forces
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* the output and is only used in emergency situations (e.g., in assertion
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* handling).
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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 errno
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* value is returned on any failure.
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*
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****************************************************************************/
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int syslog_force(int ch);
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/****************************************************************************
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* Name: syslogstream_create
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*
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* Description:
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* Initializes a stream for use with the configured syslog interface.
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* 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_syslogstream_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 syslogstream_create(FAR struct lib_syslogstream_s *stream);
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/****************************************************************************
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* Name: syslogstream_destroy
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*
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* Description:
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* Free resources held by the syslog stream.
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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_syslogstream_s to be initialized.
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*
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* Returned Value:
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* None (Resources freed).
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*
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****************************************************************************/
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#ifdef CONFIG_SYSLOG_BUFFER
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void syslogstream_destroy(FAR struct lib_syslogstream_s *stream);
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#else
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# define syslogstream_destroy(s)
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __DRIVERS_SYSLOG_SYSLOG_H */
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