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ATEXIT(3)	       FreeBSD Library Functions Manual		     ATEXIT(3)

NAME
     atexit -- register	a function to be called	on exit

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <stdlib.h>

     int
     atexit(void (*function)(void));

DESCRIPTION
     The atexit() function registers the given function	to be called at	pro-
     gram exit,	whether	via exit(3) or via return from the program's main().
     Functions so registered are called	in reverse order; no arguments are
     passed.

     These functions 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 function may	cause abnormal process termi-
     nation, for example by calling abort(3).)

     At	least 32 functions can always be registered, and more are allowed as
     long as sufficient	memory can be allocated.

RETURN VALUES
     The atexit() function returns 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'').

FreeBSD	9.3		       September 6, 2002		   FreeBSD 9.3

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS

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