atexit(3) - NetBSD Manual Pages

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ATEXIT(3)               NetBSD 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.  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

     at_quick_exit(3), exit(3), quick_exit(3)


STANDARDS

     The atexit() function conforms to ANSI X3.159-1989 (``ANSI C89'').

NetBSD 10.1                      June 4, 1993                      NetBSD 10.1