b49be4bb20
arch/: Removed all references to CONFIG_DISABLE_POLL. The standard POSIX poll() can not longer be disabled. sched/ audio/ crypto/: Removed all references to CONFIG_DISABLE_POLL. The standard POSIX poll() can not longer be disabled. Documentation/: Removed all references to CONFIG_DISABLE_POLL. The standard POSIX poll() can not longer be disabled. fs/: Removed all references to CONFIG_DISABLE_POLL. The standard POSIX poll() can not longer be disabled. graphics/: Removed all references to CONFIG_DISABLE_POLL. The standard POSIX poll() can not longer be disabled. net/: Removed all references to CONFIG_DISABLE_POLL. The standard POSIX poll() can not longer be disabled. drivers/: Removed all references to CONFIG_DISABLE_POLL. The standard POSIX poll() can not longer be disabled. include/, syscall/, wireless/: Removed all references to CONFIG_DISABLE_POLL. The standard POSIX poll() can not longer be disabled. configs/: Remove all references to CONFIG_DISABLE_POLL. Standard POSIX poll can no longer be disabled.
802 lines
21 KiB
C
802 lines
21 KiB
C
/****************************************************************************
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* drivers/syslog/ramlog.c
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*
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* Copyright (C) 2012, 2016-2017 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 <sys/ioctl.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <poll.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/syslog/ramlog.h>
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#include <nuttx/irq.h>
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#ifdef CONFIG_RAMLOG
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct ramlog_dev_s
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{
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#ifndef CONFIG_RAMLOG_NONBLOCKING
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volatile uint8_t rl_nwaiters; /* Number of threads waiting for data */
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#endif
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volatile uint16_t rl_head; /* The head index (where data is added) */
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volatile uint16_t rl_tail; /* The tail index (where data is removed) */
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sem_t rl_exclsem; /* Enforces mutually exclusive access */
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#ifndef CONFIG_RAMLOG_NONBLOCKING
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sem_t rl_waitsem; /* Used to wait for data */
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#endif
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size_t rl_bufsize; /* Size of the RAM buffer */
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FAR char *rl_buffer; /* Circular RAM buffer */
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/* The following is a list if poll structures of threads waiting for
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* driver events. The 'struct pollfd' reference for each open is also
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* retained in the f_priv field of the 'struct file'.
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*/
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FAR struct pollfd *rl_fds[CONFIG_RAMLOG_NPOLLWAITERS];
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Syslog channel methods */
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#ifdef CONFIG_RAMLOG_SYSLOG
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static int ramlog_flush(void);
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#endif
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/* Helper functions */
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static void ramlog_pollnotify(FAR struct ramlog_dev_s *priv,
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pollevent_t eventset);
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static ssize_t ramlog_addchar(FAR struct ramlog_dev_s *priv, char ch);
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/* Character driver methods */
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static ssize_t ramlog_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t ramlog_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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static int ramlog_poll(FAR struct file *filep, FAR struct pollfd *fds,
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bool setup);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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#ifdef CONFIG_RAMLOG_SYSLOG
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static const struct syslog_channel_s g_ramlog_syslog_channel =
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{
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ramlog_putc,
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ramlog_putc,
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ramlog_flush
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};
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_ramlogfops =
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{
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NULL, /* open */
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NULL, /* close */
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ramlog_read, /* read */
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ramlog_write, /* write */
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NULL, /* seek */
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NULL, /* ioctl */
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ramlog_poll /* poll */
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, NULL /* unlink */
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#endif
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};
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/* This is the pre-allocated buffer used for the console RAM log and/or
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* for the syslogging function.
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*/
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#if defined(CONFIG_RAMLOG_CONSOLE) || defined(CONFIG_RAMLOG_SYSLOG)
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static char g_sysbuffer[CONFIG_RAMLOG_BUFSIZE];
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/* This is the device structure for the console or syslogging function. It
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* must be statically initialized because the RAMLOG ramlog_putc function
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* could be called before the driver initialization logic executes.
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*/
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static struct ramlog_dev_s g_sysdev =
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{
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#ifndef CONFIG_RAMLOG_NONBLOCKING
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0, /* rl_nwaiters */
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#endif
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0, /* rl_head */
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0, /* rl_tail */
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SEM_INITIALIZER(1), /* rl_exclsem */
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#ifndef CONFIG_RAMLOG_NONBLOCKING
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SEM_INITIALIZER(0), /* rl_waitsem */
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#endif
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CONFIG_RAMLOG_BUFSIZE, /* rl_bufsize */
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g_sysbuffer /* rl_buffer */
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};
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ramlog_flush
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****************************************************************************/
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#ifdef CONFIG_RAMLOG_SYSLOG
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static int ramlog_flush(void)
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{
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return OK;
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}
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#endif
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/****************************************************************************
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* Name: ramlog_pollnotify
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****************************************************************************/
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static void ramlog_pollnotify(FAR struct ramlog_dev_s *priv,
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pollevent_t eventset)
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{
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FAR struct pollfd *fds;
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irqstate_t flags;
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int i;
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/* This function may be called from an interrupt handler */
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for (i = 0; i < CONFIG_RAMLOG_NPOLLWAITERS; i++)
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{
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flags = enter_critical_section();
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fds = priv->rl_fds[i];
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if (fds)
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{
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fds->revents |= (fds->events & eventset);
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if (fds->revents != 0)
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{
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nxsem_post(fds->sem);
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}
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}
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leave_critical_section(flags);
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}
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}
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/****************************************************************************
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* Name: ramlog_addchar
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****************************************************************************/
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static ssize_t ramlog_addchar(FAR struct ramlog_dev_s *priv, char ch)
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{
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irqstate_t flags;
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size_t nexthead;
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/* Disable interrupts (in case we are NOT called from interrupt handler) */
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flags = enter_critical_section();
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/* Calculate the write index AFTER the next byte is written */
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nexthead = priv->rl_head + 1;
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if (nexthead >= priv->rl_bufsize)
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{
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nexthead = 0;
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}
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/* Would the next write overflow the circular buffer? */
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if (nexthead == priv->rl_tail)
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{
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/* Yes... Return an indication that nothing was saved in the buffer. */
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leave_critical_section(flags);
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return -EBUSY;
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}
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/* No... copy the byte and re-enable interrupts */
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priv->rl_buffer[priv->rl_head] = ch;
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priv->rl_head = nexthead;
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leave_critical_section(flags);
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return OK;
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}
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/****************************************************************************
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* Name: ramlog_read
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****************************************************************************/
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static ssize_t ramlog_read(FAR struct file *filep, FAR char *buffer, size_t len)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct ramlog_dev_s *priv;
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ssize_t nread;
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char ch;
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int ret;
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/* Some sanity checking */
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DEBUGASSERT(inode && inode->i_private);
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priv = (FAR struct ramlog_dev_s *)inode->i_private;
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/* If the circular buffer is empty, then wait for something to be written
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* to it. This function may NOT be called from an interrupt handler.
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*/
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DEBUGASSERT(!up_interrupt_context());
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/* Get exclusive access to the rl_tail index */
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ret = nxsem_wait(&priv->rl_exclsem);
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if (ret < 0)
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{
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return ret;
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}
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/* Loop until something is read */
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for (nread = 0; (size_t)nread < len; )
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{
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/* Get the next byte from the buffer */
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if (priv->rl_head == priv->rl_tail)
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{
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/* The circular buffer is empty. */
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#ifdef CONFIG_RAMLOG_NONBLOCKING
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/* Return what we have (with zero mean the end-of-file) */
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break;
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#else
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/* Did we read anything? */
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if (nread > 0)
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{
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/* Yes.. re-enable interrupts and the break out to return what
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* we have.
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*/
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break;
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}
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/* If the driver was opened with O_NONBLOCK option, then don't wait.
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* Re-enable interrupts and return EGAIN.
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*/
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if (filep->f_oflags & O_NONBLOCK)
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{
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nread = -EAGAIN;
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break;
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}
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/* Otherwise, wait for something to be written to the circular
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* buffer. Increment the number of waiters so that the ramlog_write()
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* will not that it needs to post the semaphore to wake us up.
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*/
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sched_lock();
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priv->rl_nwaiters++;
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nxsem_post(&priv->rl_exclsem);
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/* We may now be pre-empted! But that should be okay because we
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* have already incremented nwaiters. Pre-emptions is disabled
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* but will be re-enabled while we are waiting.
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*/
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ret = nxsem_wait(&priv->rl_waitsem);
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/* Interrupts will be disabled when we return. So the decrementing
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* rl_nwaiters here is safe.
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*/
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priv->rl_nwaiters--;
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sched_unlock();
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/* Did we successfully get the rl_waitsem? */
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if (ret >= 0)
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{
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/* Yes... then retake the mutual exclusion semaphore */
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ret = nxsem_wait(&priv->rl_exclsem);
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}
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/* Was the semaphore wait successful? Did we successful re-take the
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* mutual exclusion semaphore?
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*/
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if (ret < 0)
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{
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/* No.. One of the two nxsem_wait's failed. */
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/* Were we awakened by a signal? Did we read anything before
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* we received the signal?
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*/
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if (ret != -EINTR || nread >= 0)
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{
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/* Yes.. return the error. */
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nread = ret;
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}
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/* Break out to return what we have. Note, we can't exactly
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* "break" out because whichever error occurred, we do not hold
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* the exclusion semaphore.
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*/
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goto errout_without_sem;
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}
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#endif /* CONFIG_RAMLOG_NONBLOCKING */
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}
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else
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{
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/* The circular buffer is not empty, get the next byte from the
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* tail index.
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*/
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ch = priv->rl_buffer[priv->rl_tail];
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/* Increment the tail index and re-enable interrupts */
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if (++priv->rl_tail >= priv->rl_bufsize)
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{
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priv->rl_tail = 0;
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}
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/* Add the character to the user buffer */
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buffer[nread] = ch;
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nread++;
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}
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}
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/* Relinquish the mutual exclusion semaphore */
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nxsem_post(&priv->rl_exclsem);
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/* Notify all poll/select waiters that they can write to the FIFO */
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#ifndef CONFIG_RAMLOG_NONBLOCKING
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errout_without_sem:
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#endif
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if (nread > 0)
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{
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ramlog_pollnotify(priv, POLLOUT);
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}
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/* Return the number of characters actually read */
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return nread;
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}
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/****************************************************************************
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* Name: ramlog_write
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****************************************************************************/
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static ssize_t ramlog_write(FAR struct file *filep, FAR const char *buffer, size_t len)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct ramlog_dev_s *priv;
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ssize_t nwritten;
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char ch;
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int ret;
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/* Some sanity checking */
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DEBUGASSERT(inode && inode->i_private);
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priv = (FAR struct ramlog_dev_s *)inode->i_private;
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/* Loop until all of the bytes have been written. This function may be
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* called from an interrupt handler! Semaphores cannot be used!
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*
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* The write logic only needs to modify the rl_head index. Therefore,
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* there is a difference in the way that rl_head and rl_tail are protected:
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* rl_tail is protected with a semaphore; rl_tail is protected by disabling
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* interrupts.
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*/
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for (nwritten = 0; (size_t)nwritten < len; nwritten++)
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{
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/* Get the next character to output */
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ch = buffer[nwritten];
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/* Ignore carriage returns */
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#ifdef CONFIG_RAMLOG_CRLF
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if (ch == '\r')
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{
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continue;
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}
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/* Pre-pend a carriage before a linefeed */
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if (ch == '\n')
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{
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ret = ramlog_addchar(priv, '\r');
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if (ret < 0)
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{
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/* The buffer is full and nothing was saved. Break out of the
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* loop to return the number of bytes written up to this point.
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* The data to be written is dropped on the floor.
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*/
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break;
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}
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}
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#endif
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/* Then output the character */
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ret = ramlog_addchar(priv, ch);
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if (ret < 0)
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{
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/* The buffer is full and nothing was saved. Break out of the
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* loop to return the number of bytes written up to this point.
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* The data to be written is dropped on the floor.
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*/
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break;
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}
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}
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/* Was anything written? */
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if (nwritten > 0)
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{
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irqstate_t flags;
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#ifndef CONFIG_RAMLOG_NONBLOCKING
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int i;
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#endif
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/* Are there threads waiting for read data? */
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flags = enter_critical_section();
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#ifndef CONFIG_RAMLOG_NONBLOCKING
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for (i = 0; i < priv->rl_nwaiters; i++)
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{
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/* Yes.. Notify all of the waiting readers that more data is available */
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nxsem_post(&priv->rl_waitsem);
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}
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#endif
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/* Notify all poll/select waiters that they can write to the FIFO */
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ramlog_pollnotify(priv, POLLIN);
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leave_critical_section(flags);
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}
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/* We always have to return the number of bytes requested and NOT the
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* number of bytes that were actually written. Otherwise, callers
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* will think that this is a short write and probably retry (causing
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*/
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return len;
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}
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|
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/****************************************************************************
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* Name: ramlog_poll
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****************************************************************************/
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int ramlog_poll(FAR struct file *filep, FAR struct pollfd *fds, bool setup)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct ramlog_dev_s *priv;
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pollevent_t eventset;
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size_t ndx;
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int ret;
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int i;
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/* Some sanity checking */
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DEBUGASSERT(inode && inode->i_private);
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priv = (FAR struct ramlog_dev_s *)inode->i_private;
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/* Get exclusive access to the poll structures */
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ret = nxsem_wait(&priv->rl_exclsem);
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if (ret < 0)
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{
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return ret;
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}
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/* Are we setting up the poll? Or tearing it down? */
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if (setup)
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{
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/* This is a request to set up the poll. Find an available
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* slot for the poll structure reference
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*/
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for (i = 0; i < CONFIG_RAMLOG_NPOLLWAITERS; i++)
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{
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/* Find an available slot */
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if (!priv->rl_fds[i])
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{
|
|
/* Bind the poll structure and this slot */
|
|
|
|
priv->rl_fds[i] = fds;
|
|
fds->priv = &priv->rl_fds[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i >= CONFIG_RAMLOG_NPOLLWAITERS)
|
|
{
|
|
fds->priv = NULL;
|
|
ret = -EBUSY;
|
|
goto errout;
|
|
}
|
|
|
|
/* Should immediately notify on any of the requested events?
|
|
* First, check if the xmit buffer is full.
|
|
*/
|
|
|
|
eventset = 0;
|
|
|
|
ndx = priv->rl_head + 1;
|
|
if (ndx >= priv->rl_bufsize)
|
|
{
|
|
ndx = 0;
|
|
}
|
|
|
|
if (ndx != priv->rl_tail)
|
|
{
|
|
eventset |= POLLOUT;
|
|
}
|
|
|
|
/* Check if the receive buffer is empty */
|
|
|
|
if (priv->rl_head != priv->rl_tail)
|
|
{
|
|
eventset |= POLLIN;
|
|
}
|
|
|
|
if (eventset)
|
|
{
|
|
ramlog_pollnotify(priv, eventset);
|
|
}
|
|
|
|
}
|
|
else if (fds->priv)
|
|
{
|
|
/* This is a request to tear down the poll. */
|
|
|
|
struct pollfd **slot = (struct pollfd **)fds->priv;
|
|
|
|
#ifdef CONFIG_DEBUG_FEATURES
|
|
if (!slot)
|
|
{
|
|
ret = -EIO;
|
|
goto errout;
|
|
}
|
|
#endif
|
|
|
|
/* Remove all memory of the poll setup */
|
|
|
|
*slot = NULL;
|
|
fds->priv = NULL;
|
|
}
|
|
|
|
errout:
|
|
nxsem_post(&priv->rl_exclsem);
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: ramlog_register
|
|
*
|
|
* Description:
|
|
* Create the RAM logging device and register it at the specified path.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if !defined(CONFIG_RAMLOG_CONSOLE) && !defined(CONFIG_RAMLOG_SYSLOG)
|
|
int ramlog_register(FAR const char *devpath, FAR char *buffer, size_t buflen)
|
|
{
|
|
FAR struct ramlog_dev_s *priv;
|
|
int ret = -ENOMEM;
|
|
|
|
/* Sanity checking */
|
|
|
|
DEBUGASSERT(devpath && buffer && buflen > 1);
|
|
|
|
/* Allocate a RAM logging device structure */
|
|
|
|
priv = (struct ramlog_dev_s *)kmm_zalloc(sizeof(struct ramlog_dev_s));
|
|
if (priv != NULL)
|
|
{
|
|
/* Initialize the non-zero values in the RAM logging device structure */
|
|
|
|
nxsem_init(&priv->rl_exclsem, 0, 1);
|
|
#ifndef CONFIG_RAMLOG_NONBLOCKING
|
|
nxsem_init(&priv->rl_waitsem, 0, 0);
|
|
|
|
/* The rl_waitsem semaphore is used for signaling and, hence, should
|
|
* not have priority inheritance enabled.
|
|
*/
|
|
|
|
nxsem_setprotocol(&priv->rl_waitsem, SEM_PRIO_NONE);
|
|
#endif
|
|
|
|
priv->rl_bufsize = buflen;
|
|
priv->rl_buffer = buffer;
|
|
|
|
/* Register the character driver */
|
|
|
|
ret = register_driver(devpath, &g_ramlogfops, 0666, priv);
|
|
if (ret < 0)
|
|
{
|
|
kmm_free(priv);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: ramlog_consoleinit
|
|
*
|
|
* Description:
|
|
* Use a pre-allocated RAM logging device and register it at /dev/console
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_RAMLOG_CONSOLE
|
|
int ramlog_consoleinit(void)
|
|
{
|
|
FAR struct ramlog_dev_s *priv = &g_sysdev;
|
|
|
|
/* Register the console character driver */
|
|
|
|
return register_driver("/dev/console", &g_ramlogfops, 0666, priv);
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: ramlog_syslog_channel
|
|
*
|
|
* Description:
|
|
* Use a pre-allocated RAM logging device and register it at the path
|
|
* specified by CONFIG_RAMLOG_SYSLOG
|
|
*
|
|
* If CONFIG_RAMLOG_CONSOLE is also defined, then this functionality is
|
|
* performed when ramlog_consoleinit() is called.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_RAMLOG_SYSLOG
|
|
int ramlog_syslog_channel(void)
|
|
{
|
|
int ret;
|
|
|
|
/* Register the syslog character driver */
|
|
|
|
ret = register_driver(CONFIG_SYSLOG_DEVPATH, &g_ramlogfops, 0666, &g_sysdev);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Use the RAMLOG as the SYSLOG channel */
|
|
|
|
return syslog_channel(&g_ramlog_syslog_channel);
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: ramlog_putc
|
|
*
|
|
* Description:
|
|
* This is the low-level system logging interface.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#if defined(CONFIG_RAMLOG_CONSOLE) || defined(CONFIG_RAMLOG_SYSLOG)
|
|
int ramlog_putc(int ch)
|
|
{
|
|
FAR struct ramlog_dev_s *priv = &g_sysdev;
|
|
int ret;
|
|
|
|
#ifdef CONFIG_RAMLOG_CRLF
|
|
/* Ignore carriage returns. But return success. */
|
|
|
|
if (ch == '\r')
|
|
{
|
|
return ch;
|
|
}
|
|
|
|
/* Pre-pend a newline with a carriage return */
|
|
|
|
if (ch == '\n')
|
|
{
|
|
ret = ramlog_addchar(priv, '\r');
|
|
if (ret < 0)
|
|
{
|
|
/* The buffer is full and nothing was saved. */
|
|
|
|
return ret;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Add the character to the RAMLOG */
|
|
|
|
ret = ramlog_addchar(priv, ch);
|
|
if (ret < 0)
|
|
{
|
|
/* ramlog_addchar() failed */
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Return the character added on success */
|
|
|
|
return ch;
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_RAMLOG */
|