NAME
atexit —
register a function to be called on
exit
LIBRARY
library “libc”
SYNOPSIS
#include
<stdlib.h>
int
atexit(void
(*function)(void));
DESCRIPTION
Theatexit()
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.
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
ISO/IEC 9899:1990
(“ISO C90”).