2005-01-18 Andrew J. Schorr <ajschorr@alumni.princeton.edu>

2005-01-18 Andrew J. Schorr <ajschorr@alumni.princeton.edu>

	* log.h: Test for SA_SIGINFO to see whether zlog_signal takes final
	  two args (siginfo and program_counter).
	* log.c: (hex_append) Include this function only if SA_SIGINFO or
	  HAVE_GLIBC_BACKTRACE is defined.
	  (zlog_signal) Final two args (siginfo and program_counter) now
	  depend on whether SA_SIGINFO is defined on this platform.
	* sigevent.c: (program_counter) Do not include this function if
	  SA_SIGINFO is not defined on this platform.
	  (exit_handler,core_handler) Test for SA_SIGINFO to decide whether
	  2nd & 3rd arguments are present and to decide how to invoke
	  zlog_signal.
	  (trap_default_signals) Test for SA_SIGINFO and invoke sigaction
	  appropriately.