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+NSPR Logging
+============
+
+This chapter describes the global functions you use to perform logging.
+NSPR provides a set of logging functions that conditionally write
+``printf()`` style strings to the console or to a log file. NSPR uses
+this facility itself for its own development debugging purposes.
+
+You can select events to be logged by module or level. A module is a
+user-defined class of log events. A level is a numeric value that
+indicates the seriousness of the event to be logged. You can combine
+module and level criteria to get highly selective logging.
+
+NSPR also provides "assert"-style macros and functions to aid in
+application debugging.
+
+-  `Conditional Compilation and
+   Execution <#Conditional_Compilation_and_Execution>`__
+-  `Log Types and Variables <#Log_Types_and_Variables>`__
+-  `Logging Functions and Macros <#Logging_Functions_and_Macros>`__
+-  `Use Example <#Use_Example>`__
+
+.. _Conditional_Compilation_and_Execution:
+
+Conditional Compilation and Execution
+-------------------------------------
+
+NSPR's logging facility is conditionally compiled in and enabled for
+applications using it. These controls are platform dependent. Logging is
+not compiled in for the Win16 platform. Logging is compiled into the
+NSPR debug builds; logging is not compiled into the NSPR optimized
+builds. The compile time ``#define`` values ``DEBUG`` or
+``FORCE_PR_LOG`` enable NSPR logging for application programs.
+
+To enable NSPR logging and/or the debugging aids in your application,
+compile using the NSPR debug build headers and runtime. Set one of the
+compile-time defines when you build your application.
+
+Execution-time control of NSPR's logging uses two environment variables.
+These variables control which modules and levels are logged as well as
+the file name of the log file. By default, no logging is enabled at
+execution time.
+
+.. _Log_Types_and_Variables:
+
+Log Types and Variables
+-----------------------
+
+Two types supporting NSPR logging are exposed in the API:
+
+ - :ref:`PRLogModuleInfo`
+ - :ref:`PRLogModuleLevel`
+
+Two environment variables control the behavior of logging at execution
+time:
+
+ - :ref:`NSPR_LOG_MODULES`
+ - :ref:`NSPR_LOG_FILE`
+
+.. _Logging_Functions_and_Macros:
+
+Logging Functions and Macros
+----------------------------
+
+The functions and macros for logging are:
+
+ - :ref:`PR_NewLogModule`
+ - :ref:`PR_SetLogFile`
+ - :ref:`PR_SetLogBuffering`
+ - :ref:`PR_LogPrint`
+ - :ref:`PR_LogFlush`
+ - :ref:`PR_LOG_TEST`
+ - :ref:`PR_LOG`
+ - :ref:`PR_Assert`
+ - :ref:`PR_STATIC_ASSERT` (new in NSPR 4.6.6XXX this hasn't been released
+   yet; the number is a logical guess)
+ - :ref:`PR_NOT_REACHED`
+
+.. note::
+
+   The above documentation has not been ported to MDN yet, see
+   http://www-archive.mozilla.org/projects/nspr/reference/html/prlog.html#25338.
+
+.. _Use_Example:
+
+Use Example
+-----------
+
+The following sample code fragment demonstrates use of the logging and
+debugging aids.
+
+-  Compile the program with DEBUG defined.
+-  Before running the compiled program, set the environment variable
+   NSPR_LOG_MODULES to userStuff:5
+
+.. code::
+
+   static void UserLogStuff( void )
+   {
+       PRLogModuleInfo *myLM;
+       PRIntn i;
+
+       PR_STATIC_ASSERT(5 > 4); /* NSPR 4.6.6 or newer */
+
+       myLM = PR_NewLogModule( "userStuff" );
+       PR_ASSERT( myLM );
+
+       PR_LOG( myLM, PR_LOG_NOTICE, ("Log a Notice %d\n", 999 ));
+       for (i = 0; i < 10 ; i++ )
+       {
+           PR_LOG( myLM, PR_LOG_DEBUG, ("Log Debug number: %d\n", i));
+           PR_Sleep( 500 );
+       }
+       PR_LOG( myLM, PR_LOG_NOTICE, "That's all folks\n");
+
+   } /* end UserLogStuff() */