AT_EXIT(9)		 BSD Kernel Developer's Manual		    AT_EXIT(9)

NAME
     at_exit, rm_at_exit — ask that a function be run at exit

SYNOPSIS
     #include <sys/types.h>
     #include <sys/systm.h>

     typedef void (exitlist_fn) (struct proc *);

     int
     at_exit(exitlist_fn func);

     int
     rm_at_exit(exitlist_fn func);

DESCRIPTION
     The at_exit facility allows a kernel module to ensure that it is notified
     at any process exit.  The function func is called with the a pointer to
     the exiting process's proc structure.

     If the requirement for notification is removed, then the function
     rm_at_exit() must be called with the exact func argument as the corre‐
     sponding call to at_exit().

RETURN VALUES
     The at_exit() function returns an errno, 0 meaning success.  The
     rm_at_exit() function returns the number of items removed (should be 0 or
     1).

SEE ALSO
     _exit(2)

HISTORY
     The at_exit() function appeared in FreeBSD 2.2.

AUTHORS
     The function was written by Julian Elischer ⟨julian@FreeBSD.org⟩.

BSD				August 15, 1996				   BSD

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