atexit_b man page on MacOSX

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ATEXIT(3)		 BSD Library Functions Manual		     ATEXIT(3)

NAME
     atexit — register a function to be called on exit

SYNOPSIS
     #include <stdlib.h>

     int
     atexit(void (*func)(void));

     int
     atexit_b(void (^block)(void));

DESCRIPTION
     The atexit() function registers the function func to be called at program
     exit, whether via exit(3) or via return from the program's main().	 Func‐
     tions so registered are called in reverse order; no arguments are passed.

     The atexit_b() function is like atexit() except the callback is a block
     pointer instead of a function pointer.

	   Note: The Block_copy() function (defined in <Blocks.h>) is used by
	   atexit_b() to make a copy of the block, especially for the case
	   when a stack-based block might go out of scope when the subroutine
	   returns.

     These callbacks must not call exit(); if it should be necessary to termi‐
     nate the process while in such a function, the _exit(2) function should
     be used.  (Alternatively, the callbacks may cause abnormal process termi‐
     nation, for example by calling abort(3).)

     At least 32 callbacks can always be registered; more are allowed as long
     as sufficient memory can be allocated.

RETURN VALUES
     The atexit() and atexit_b() functions return the value 0 if successful;
     otherwise the value -1 is returned and the global variable errno is set
     to indicate the error.

ERRORS
     [ENOMEM]		No memory was available to add the function to the
			list.  The existing list of functions is unmodified.

SEE ALSO
     exit(3)

STANDARDS
     The atexit() function conforms to ISO/IEC 9899:1990 (“ISO C90”).

BSD				 May 20, 2008				   BSD
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