302 lines
8.5 KiB
C
302 lines
8.5 KiB
C
/****************************************************************************
|
|
* drivers/syslog/syslog_intbuffer.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/syslog/syslog.h>
|
|
#include <nuttx/irq.h>
|
|
|
|
#include "syslog.h"
|
|
|
|
#ifdef CONFIG_SYSLOG_INTBUFFER
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#if CONFIG_SYSLOG_INTBUFSIZE > 65535
|
|
# undef CONFIG_SYSLOG_INTBUFSIZE
|
|
# define CONFIG_SYSLOG_INTBUFSIZE 65535
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/* This structure encapsulates the interrupt buffer state */
|
|
|
|
struct g_syslog_intbuffer_s
|
|
{
|
|
volatile uint16_t si_inndx;
|
|
volatile uint16_t si_outndx;
|
|
uint8_t si_buffer[CONFIG_SYSLOG_INTBUFSIZE];
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
static struct g_syslog_intbuffer_s g_syslog_intbuffer;
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: syslog_remove_intbuffer
|
|
*
|
|
* Description:
|
|
* Extract any characters that may have been added to the interrupt buffer
|
|
* to the SYSLOG device.
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* On success, the extracted character is returned. EOF is returned if
|
|
* the interrupt buffer is empty.
|
|
*
|
|
* Assumptions:
|
|
* Interrupts may or may not be disabled.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int syslog_remove_intbuffer(void)
|
|
{
|
|
irqstate_t flags;
|
|
uint32_t outndx;
|
|
int ret = EOF;
|
|
|
|
/* Extraction of the character and adjustment of the circular buffer
|
|
* indices must be performed in a critical section to protect from
|
|
* concurrent modification from interrupt handlers.
|
|
*/
|
|
|
|
flags = enter_critical_section();
|
|
|
|
/* Check if the interrupt buffer is empty */
|
|
|
|
outndx = (uint32_t)g_syslog_intbuffer.si_outndx;
|
|
if (outndx != (uint32_t)g_syslog_intbuffer.si_inndx)
|
|
{
|
|
/* Not empty.. Take the next character from the interrupt buffer */
|
|
|
|
ret = g_syslog_intbuffer.si_buffer[outndx];
|
|
|
|
/* Increment the OUT index, handling wrap-around */
|
|
|
|
if (++outndx >= CONFIG_SYSLOG_INTBUFSIZE)
|
|
{
|
|
outndx -= CONFIG_SYSLOG_INTBUFSIZE;
|
|
}
|
|
|
|
g_syslog_intbuffer.si_outndx = (uint16_t)outndx;
|
|
}
|
|
|
|
leave_critical_section(flags);
|
|
|
|
/* Now we can send the extracted character to the SYSLOG device */
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: syslog_add_intbuffer
|
|
*
|
|
* Description:
|
|
* Add one more character to the interrupt buffer. In the event of
|
|
* buffer overflowed, the character will be dropped. The indication
|
|
* "[truncated]\n" will be appended to the end of the interrupt buffer.
|
|
*
|
|
* Input Parameters:
|
|
* ch - The character to add to the interrupt buffer (must be positive).
|
|
*
|
|
* Returned Value:
|
|
* Zero success, the character is echoed back to the caller. A negated
|
|
* errno value is returned on any failure.
|
|
*
|
|
* Assumptions:
|
|
* - Called either from (1) interrupt handling logic with interrupts
|
|
* disabled or from an IDLE thread with interrupts enabled.
|
|
* - Requires caution because there may be an interrupted execution of
|
|
* syslog_flush_intbuffer(): Only the outndx can be modified.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int syslog_add_intbuffer(int ch)
|
|
{
|
|
irqstate_t flags;
|
|
uint32_t inndx;
|
|
uint32_t outndx;
|
|
uint32_t endndx;
|
|
unsigned int inuse;
|
|
int ret = OK;
|
|
int i;
|
|
|
|
/* Disable concurrent modification from interrupt handling logic */
|
|
|
|
flags = enter_critical_section();
|
|
|
|
/* How much space is left in the intbuffer? */
|
|
|
|
inndx = (uint32_t)g_syslog_intbuffer.si_inndx;
|
|
outndx = (uint32_t)g_syslog_intbuffer.si_outndx;
|
|
|
|
endndx = inndx;
|
|
if (endndx < outndx)
|
|
{
|
|
endndx += CONFIG_SYSLOG_INTBUFSIZE;
|
|
}
|
|
|
|
inuse = (unsigned int)(endndx - outndx);
|
|
|
|
/* Is there space for another character */
|
|
|
|
if (inuse == CONFIG_SYSLOG_INTBUFSIZE - 1)
|
|
{
|
|
int oldch = syslog_remove_intbuffer();
|
|
for (i = 0; i < CONFIG_SYSLOG_MAX_CHANNELS; i++)
|
|
{
|
|
if (g_syslog_channel[i] == NULL)
|
|
{
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_SYSLOG_IOCTL
|
|
if (g_syslog_channel[i]->sc_disable)
|
|
{
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
/* Select which putc function to use for this flush */
|
|
|
|
if (g_syslog_channel[i]->sc_ops->sc_force)
|
|
{
|
|
g_syslog_channel[i]->sc_ops->sc_force(
|
|
g_syslog_channel[i], oldch);
|
|
}
|
|
}
|
|
|
|
ret = -ENOSPC;
|
|
}
|
|
|
|
/* Copy one character */
|
|
|
|
g_syslog_intbuffer.si_buffer[inndx] = (uint8_t)ch;
|
|
|
|
/* Increment the IN index, handling wrap-around */
|
|
|
|
if (++inndx >= CONFIG_SYSLOG_INTBUFSIZE)
|
|
{
|
|
inndx -= CONFIG_SYSLOG_INTBUFSIZE;
|
|
}
|
|
|
|
g_syslog_intbuffer.si_inndx = (uint16_t)inndx;
|
|
leave_critical_section(flags);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: syslog_flush_intbuffer
|
|
*
|
|
* Description:
|
|
* Flush any characters that may have been added to the interrupt buffer
|
|
* to the SYSLOG device.
|
|
*
|
|
* Input Parameters:
|
|
* force - Use the force() method of the channel vs. the putc() method.
|
|
*
|
|
* Returned Value:
|
|
* On success, the character is echoed back to the caller. A negated
|
|
* errno value is returned on any failure.
|
|
*
|
|
* Assumptions:
|
|
* Interrupts may or may not be disabled.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int syslog_flush_intbuffer(bool force)
|
|
{
|
|
syslog_putc_t putfunc;
|
|
int ch;
|
|
int i;
|
|
|
|
/* This logic is performed with the scheduler disabled to protect from
|
|
* concurrent modification by other tasks.
|
|
*/
|
|
|
|
sched_lock();
|
|
|
|
do
|
|
{
|
|
/* Transfer one character to time. This is inefficient, but is
|
|
* done in this way to: (1) Deal with concurrent modification of
|
|
* the interrupt buffer from interrupt activity, (2) Avoid keeper
|
|
* interrupts disabled for a long time, and (3) to handler
|
|
* wrap-around of the circular buffer indices.
|
|
*/
|
|
|
|
ch = syslog_remove_intbuffer();
|
|
|
|
for (i = 0; i < CONFIG_SYSLOG_MAX_CHANNELS; i++)
|
|
{
|
|
if ((g_syslog_channel[i] == NULL) || (ch == EOF))
|
|
{
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_SYSLOG_IOCTL
|
|
if (g_syslog_channel[i]->sc_disable)
|
|
{
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
/* Select which putc function to use for this flush */
|
|
|
|
putfunc = force ? g_syslog_channel[i]->sc_ops->sc_force :
|
|
g_syslog_channel[i]->sc_ops->sc_putc;
|
|
|
|
putfunc(g_syslog_channel[i], ch);
|
|
}
|
|
}
|
|
while (ch != EOF);
|
|
|
|
sched_unlock();
|
|
|
|
return ch;
|
|
}
|
|
|
|
#endif /* CONFIG_SYSLOG_INTBUFFER */
|