atexit(3) [redhat man page]

ATEXIT(3)						     Linux Programmer's Manual							 ATEXIT(3)

NAME

       atexit - register a function to be called at normal program termination.

SYNOPSIS

       #include <stdlib.h>

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

DESCRIPTION

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

RETURN VALUE

       The atexit() function returns the value 0 if successful; otherwise it returns a nonzero value; errno is not set.

CONFORMING TO

       SVID 3, BSD 4.3, ISO 9899

SEE ALSO

       exit(3), on_exit(3)

GNU
								    1997-09-14								 ATEXIT(3)

ATEXIT(3)						   BSD 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));

     int
     atexit_b(void (^function)(void));

DESCRIPTION

     The atexit() function registers the given function to be called at program 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 terminate the process while in such a function, the _exit(2) function
     should be used.  (Alternatively, the function may cause abnormal process termination, 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.

     The atexit_b() function behaves identically to atexit(), except that it takes a block, rather than a function pointer.

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.

     [ENOSYS]		The atexit_b() function was called by a program that did not supply a _Block_copy() implementation.

SEE ALSO

     at_quick_exit(3), exit(3)

STANDARDS

     The atexit() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

BSD
								 September 6, 2002							       BSD