Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3

nuttx/drivers/syslog/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+
+comment "System Logging"
+
+config RAMLOG
+	bool "RAM log device support"
+	default n
+	---help---
+		This is a driver that was intended to support debugging output,
+		aka syslogging, when the normal serial output is not available.
+		For example, if you are using a telnet or USB serial console,
+		the debug output will get lost.  However, the RAMLOG device should
+		be usable even if system logging is disabled.
+
+		This driver is similar to a pipe in that it saves the debugging
+		output in a FIFO in RAM.  It differs from a pipe in numerous
+		details as needed to support logging.
+
+if RAMLOG
+config RAMLOG_SYSLOG
+	bool "Use RAMLOG for SYSLOG"
+	default n
+	depends on SYSLOG
+	---help---
+		Use the RAM logging device for the syslogging interface.  If this feature
+		is enabled (along with SYSLOG), then all debug output (only) will be re-directed
+		to the circular buffer in RAM.  This RAM log can be view from NSH using the
+		'dmesg'command.
+
+		Do not enable more than one SYSLOG device.
+
+config RAMLOG_CONSOLE
+	bool "Use RAMLOG for /dev/console"
+	default n
+	depends on DEV_CONSOLE
+	---help---
+		Use the RAM logging device as a system console. If this feature is enabled (along
+		with DEV_CONSOLE), then all console output will be re-directed to a circular
+		buffer in RAM.  This is useful, for example, if the only console is a Telnet
+		console.  Then in that case, console output from non-Telnet threads will go to
+		the circular buffer and can be viewed using the NSH 'dmesg' command.
+
+config RAMLOG_CONSOLE_BUFSIZE
+	int "RAMLOG buffer size"
+	default 1024
+	depends on RAMLOG_SYSLOG || RAMLOG_CONSOLE
+	---help---
+		Size of the console RAM log.  Default: 1024
+
+config RAMLOG_CRLF
+	bool "RAMLOG CR/LF"
+	default n
+	---help---
+		Pre-pend a carriage return before every linefeed that goes into the RAM log.
+
+config RAMLOG_NONBLOCKING
+	bool "RAMLOG non-block reads"
+	default y
+	---help---
+		Reading from the RAMLOG will never block if the RAMLOG is empty.  If the RAMLOG
+		is empty, then zero is returned (usually interpreted as end-of-file).
+
+config RAMLOG_NPOLLWAITERS
+	int "RAMLOG number of poll waiters"
+	default 4
+	depends on !DISABLE_POLL
+	---help---
+		The maximum number of threads that may be waiting on the poll method.
+
+endif