NAME
atexit —
register a function to be called on
exit
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.
atexit()
is very difficult to use correctly without creating
exit(3)-time races. Unless absolutely necessary, please avoid using
it.
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
STANDARDS
The atexit() function conforms to
ANSI X3.159-1989
(“ANSI C89”).