NAME

       appender_type_stream2.h - Log4c stream2 appender interface.

SYNOPSIS

       #include <log4c/defs.h>
       #include <log4c/appender.h>

   Functions
       void log4c_stream2_set_fp (log4c_appender_t *a_this, FILE *fp)
       FILE * log4c_stream2_get_fp (log4c_appender_t *a_this)
       void log4c_stream2_set_flags (log4c_appender_t *a_this, int flags)
       int log4c_stream2_get_flags (log4c_appender_t *a_this)

   Variables
       __LOG4C_BEGIN_DECLS const log4c_appender_type_t log4c_appender_type_stream2

Detailed Description

       Log4c stream2 appender interface.

       The stream2 appender uses a file handle FILE* for logging. It can be used with stdout,
       stderr or a normal file. It is pretty primitive as it does not do file rotation, or have a
       maximum configurable file size etc. It improves on the stream appender in a few ways that
       make it a better starting point for new stream based appenders.

       It enhances the stream appender by allowing the default file pointer to be used in
       buffered or unbuffered mode. Also when you set the file pointer stream2 will not attempt
       to close it on exit which avoids it fighting with the owner of the file pointer. stream2
       is configured via setter functions--the udata is not exposed directly. This means that new
       options (eg. configure the open mode ) could be added to stream2 while maintaining
       backward compatability.

       The appender can be used with default values, for example as follows:

       log4c_appender_t* myappender;

       myappender = log4c_appender_get("/var/logs/mylog.log");
       log4c_appender_set_type(myappender,log4c_appender_type_get("stream2"));

       In this case the appender will be configured automatically with default values:

       • the filename is the same as the name of the appender, '/var/logs/mymlog.log'
       • the file is opened in 'w+' mode
       • the default system buffer is used (cf; setbuf() ) in buffered mode
       The stream2 appender can be configured by passing it a file pointer to use. In this case
       you manage the file pointer yourself--open, option setting, closing. If you set the file
       pointer log4c will not close the file on exiting--you must do this:
       log4c_appender_t* myappender;
       FILE * fp = fopen("myfile.log", "w");

       myappender = log4c_appender_get("myappender");
       log4c_appender_set_type(myappender, log4c_appender_type_get("stream2"));
       log4c_stream2_set_fp(stream2_appender,myfp);
       The default file pointer can be configured to use unbuffered mode. Buffered mode is
       typically 25%-50% faster than unbuffered mode but unbuffered mode is useful if your
       preference is for a more synchronized log file:
        log4c_appender_t* myappender;

       myappender = log4c_appender_get("/var/logs/mylog.log");
       log4c_appender_set_type(myappender,log4c_appender_type_get("stream2"));
       log4c_stream2_set_flags(myappender, LOG4C_STREAM2_UNBUFFERED);

Function Documentation

   int log4c_stream2_get_flags (log4c_appender_t * a_this)
       Get the flags for this appender.
       Parameters
           this a pointer to the appender
       Returns
           the flags for this appender. returns -1 if there was a problem.
   FILE * log4c_stream2_get_fp (log4c_appender_t * a_this)
       Get the file pointer for this appender.
       Parameters
           this a pointer to the appender
       Returns
           the file pointer for this appender. If there's a problem returns NULL.
   void log4c_stream2_set_flags (log4c_appender_t * a_this, int flags)
       Set the flags for this appender.
       Parameters
           this a pointer to the appender
           flags ar teh flags to set. These will overwrite the existing flags. Currently
           supported flags: LOG4C_STREAM2_UNBUFFERED
   void log4c_stream2_set_fp (log4c_appender_t * a_this, FILE * fp)
       Set the file pointer for this appender.
       Parameters
           this a pointer to the appender
           fp the file pointer this appender will use. The caller is responsible for managing the
           file pointer (open, option setting, closing).

Variable Documentation

   __LOG4C_BEGIN_DECLS const log4c_appender_type_t log4c_appender_type_stream2
       Stream2 appender type definition.
       This should be used as a parameter to the log4c_appender_set_type() routine to set the
       type of the appender.

Author

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