debian man page for explain_exit

explain_exit(3) 					     Library Functions Manual						   explain_exit(3)

NAME
       explain_exit - print an explanation of exit status before exiting

SYNOPSIS
       #include <libexplain/libexplain.h>
       void explain_exit_on_exit(void);
       void explain_exit_on_error(void);
       void explain_exit_cancel(void);

DESCRIPTION
       The  explain_exit_on_exit  function  may  be  used to have the calling program print an explanation of its exit status (the value passed to
       exit(3) or the return value from main) immediately before it terminates.

       The explain_exit_on_error function may be used to have the calling program print an explanation of its exit status  immediately	before	it
       terminates, if that exit status is not EXIT_SUCCESS.

       The explain_exit_cancel function may be used to cancel the effect of the explain_exit_on_exit or explain_exit_on_error function.

       These  functions  may  be  called multiple times, and in any order.  The last called has precedence.  The explanation will never be printed
       more than once.

   Call Exit As Normal
       In order to have the explanation printed, simply call exit(3) as normal, or return from main as normal.	Do not call any of these functions
       in order to exit your program, they are called before you exit your program.

   Caveat
       This  functionality  is	only available on systems with the on_exit(3) system call.  Unfortunately, the atexit(3) system call is not suffi-
       ciently capable, as it does not pass the exit status to the registered function.

SEE ALSO
       exit(3) cause normal process termination

       atexit(3)
	       register a function to be called at normal process termination

       on_exit(3)
	       register a function to be called at normal process termination

COPYRIGHT
       libexplain version 0.52
       Copyright (C) 2009 Peter Miller

AUTHOR
       Written by Peter Miller <pmiller@opensource.org.au>

																   explain_exit(3)