2004-11-26 Andrew J. Schorr <ajschorr@alumni.princeton.edu>

2004-11-26 Andrew J. Schorr <ajschorr@alumni.princeton.edu>

	* log.c: (zlog_backtrace) New function to log a backtrace.
	  (zlog_backtrace_safe) Log a backtrace in an async-signal-safe way.
	  Unfortunately, this function does not support syslog logging yet.
	  (zlog_signal) Move backtrace code into separate function
	  zlog_backtrace_safe.
	  (_zlog_assert_failed) Call zlog_backtrace before aborting.
	* log.h: Declare new functions zlog_backtrace and zlog_backtrace_safe.
	* memory.c: (zerror) Call zlog_backtrace before aborting.