netbsd man page for atexit

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));

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.  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 ANSI X3.159-1989 (``ANSI C89'').

BSD
								   June 4, 1993 							       BSD