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+include <clset.h>
+
+# POST_EXIT_HANDLER -- Post an error handler that exits with an error code
+
+# The standard behavior of an iraf program is to exit with an error code
+# of zero regardless of whether program execution is halted with an error.
+# This behavior complicates control of tasks by user scripts. To change this
+# behavor, this procedure posts an error handler that exits the program with
+# its error code set to the value passed to the error procedure. The exit
+# procedure is only called of the program terminates with a non-zero error
+# status and the program is being run at the host level. The latter 
+# restriction is in place because exiting a program running under the iraf
+# command language (cl) hangs the command language. Since error handlers
+# a run in the order that they are posted, this procedure should be called
+# after any other error handlers you may have in your program.
+#
+# Nelson Zarate		30-Nov-95	original
+
+procedure post_exit_handler ()
+
+#--
+extern 	exit_handler()
+int 	clstati()
+
+begin
+	# Only post the exit handler if the task is being run in host mode
+
+	if (clstati(CL_PRTYPE) == PR_HOST)
+	    call onerror(exit_handler)
+end
+
+# EXIT_HANDLER -- Error handler that exits the program, setting the error code
+
+procedure exit_handler (status)
+
+int	status		# i: program exit status
+#--
+
+begin
+	# Only take exit if error status is non-zero (not OK)
+
+	if (status != OK) {
+	    # Must clean up file i/o first
+	    # The OK flag flushes the buffers
+
+	    call fio_cleanup (OK)
+
+	    # Take the error exit with the specified status
+
+	    call errxit (status)
+	}
+end