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 */