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Diffstat (limited to 'nuttx/drivers/syslog/syslog.c')
-rw-r--r-- | nuttx/drivers/syslog/syslog.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/nuttx/drivers/syslog/syslog.c b/nuttx/drivers/syslog/syslog.c new file mode 100644 index 000000000..60e9cffcb --- /dev/null +++ b/nuttx/drivers/syslog/syslog.c @@ -0,0 +1,177 @@ +/**************************************************************************** + * drivers/syslog/syslog.c + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/types.h> + +#include <stdint.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> + +#include <nuttx/syslog.h> + +#if defined(CONFIG_SYSLOG) && defined(CONFIG_SYSLOG_CHAR) + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct syslog_dev_s +{ + int fd; /* File descriptor of the opened SYSLOG character device */ +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/* This is the device structure for the console or syslogging function. It + * must be statically initialized because the RAMLOG syslog_putc function + * could be called before the driver initialization logic executes. + */ + +static struct syslog_dev_s g_sysdev = { -1 }; +static const uint8_t g_syscrlf[2] = { '\r', '\n' }; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: syslog_initialize + * + * Description: + * Initialize to use the character device at CONFIG_SYSLOG_DEVPATH as the + * SYSLOG. + * + ****************************************************************************/ + +int syslog_initialize(void) +{ + /* Has the device been opened yet */ + + if (g_sysdev.fd < 0) + { + /* No, try to open the device now: write-only, try to create it if + * it doesn't exist (it might be a file), if it is a file that already + * exists, then append new log data to the file. + */ + + g_sysdev.fd = open(CONFIG_SYSLOG_DEVPATH, O_WRONLY | O_CREAT | O_APPEND, 0644); + if (g_sysdev.fd < 0) + { + return -get_errno(); + } + } + + /* The SYSLOG device is open and ready for writing. */ + + return OK; +} + +/**************************************************************************** + * Name: syslog_putc + * + * Description: + * This is the low-level system logging interface. The debugging/syslogging + * interfaces are lib_rawprintf() and lib_lowprinf(). The difference is + * the lib_rawprintf() writes to fd=1 (stdout) and lib_lowprintf() uses + * a lower level interface that works from interrupt handlers. This + * function is a a low-level interface used to implement lib_lowprintf(). + * + ****************************************************************************/ + +int syslog_putc(int ch) +{ + ssize_t nbytes; + int ret; + + /* Try to initialize the device. We do this repeatedly because the log + * device might be something that was not ready the first time that + * syslog_intialize() was called (such as a USB serial device or a file + * in an NFS mounted file system. + */ + + ret = syslog_initialize(); + if (ret < 0) + { + return ret; + } + + /* Ignore carriage returns */ + + if (ch == '\r') + { + return ch; + } + + /* Pre-pend a newline with a carriage return */ + + if (ch == '\n') + { + nbytes = write(g_sysdev.fd, g_syscrlf, 2); + } + else + { + nbytes = write(g_sysdev.fd, &ch, 1); + } + + if (nbytes < 0) + { + return nbytes; + } + + return ch; +} + +#endif /* CONFIG_SYSLOG && CONFIG_SYSLOG_CHAR */ |