CFLog

From iPhone Development Wiki

CFLog is the backend of NSLog. It is useful for logging in apps where Foundation framework is not imported.

If you're writing a pure C framework, consider using syslog(3) instead.

References

• Official header of CFLog: http://opensource.apple.com/source/CF/CF-476.19/CFLogUtilities.h
• Source code of CFLog: http://opensource.apple.com/source/CF/CF-476.19/CFUtilities.c