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NAME

       on_exit   -  register  a  function  to  be  called  at  normal  process
       termination

SYNOPSIS

       #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(): _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

       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.

RETURN VALUE

       The on_exit() function returns the value 0 if successful; otherwise  it
       returns a non-zero value.

CONFORMING TO

       This  function  comes from SunOS 4, but is also present in libc4, libc5
       and glibc.  It no longer occurs  in  Solaris  (SunOS  5).   Avoid  this
       function, and use the standard atexit(3) instead.

SEE ALSO

       _exit(2), atexit(3), exit(3)

COLOPHON

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       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.