Logging with ASL -- Apple System Logger

Convenience functions

logging.h and logging.c includes convenience functionality suitable for most small-to-medium scale programs. Have a look at usage.c for a minimalistic example or example.c for a more complete program.

You can build and test the example.c program by running make:

make
./example --help

When logging.h is used in Objective-C, there are an extra set of macros defined for logging with NSStrings and related arguments. These macros begin with a capital letter L (i.e. Log_info).

Objective-C ASLLogger

The objc directory contain a Objective-C OOP library, designed in Apple Foundation fashion. The ASLLogger provide, in contrast to the logging.h convenience macros, thread safety. ASLLoggers and ASLConnections are stored in thread-local space. However; passing instances of ASLLogger between threads will cause problems. You should instead aquire new loggers for each thread using +(ASLLogger *)loggerForModule:(NSString *)m.

You can build and test the objc/example.m program:

cd objc
make
./example

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By Rasmus Andersson