on_exit - register a function to be called at normal process termination
#include <stdlib.h>
int on_exit(void (*function)(int , void *), void *arg);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
on_exit():
Since glibc 2.19:
_DEFAULT_SOURCE
Glibc 2.19 and earlier:
_BSD_SOURCE || _SVID_SOURCE
The
on_exit() function registers the given
function to be called
at normal process termination, whether via
exit(3) or via return from
the program's
main(). The
function is passed the status argument
given to the last call to
exit(3) and the
arg argument from
on_exit().
The same function may be registered multiple times: it is called once for each
registration.
When a child process is created via
fork(2), it inherits copies of its
parent's registrations. Upon a successful call to one of the
exec(3)
functions, all registrations are removed.
The
on_exit() function returns the value 0 if successful; otherwise it
returns a nonzero value.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| on_exit () |
Thread safety |
MT-Safe |
This function comes from SunOS 4, but is also present in glibc. It no longer
occurs in Solaris (SunOS 5). Portable application should avoid this function,
and use the standard
atexit(3) instead.
By the time
function is executed, stack (
auto) variables may
already have gone out of scope. Therefore,
arg should not be a pointer
to a stack variable; it may however be a pointer to a heap variable or a
global variable.
_exit(2),
atexit(3),
exit(3)