AT_FORK(9) BSD Kernel Developer's Manual AT_FORK(9)NAME
at_fork, rm_at_fork — ask that a function be run at fork
SYNOPSIS
#include <sys/types.h>
#include <sys/systm.h>
typedef void
(*forklist_fn)(struct proc *, struct proc *, int);
int
at_fork(forklist_fn func);
int
rm_at_fork(forklist_fn func);
DESCRIPTION
The at_fork facility allows a kernel module to ensure that it is notified
at any process fork. The function func is called with the a pointer to
the forking process's proc structure, a pointer to the child's process
structure and a flag word, as used in rfork(2) to indicate the type of
fork.
If the requirement for notification is removed, then the function
rm_at_fork() must be called with the exact func argument as the corre‐
sponding call to at_fork().
RETURN VALUESat_fork() returns an errno, 0 meaning success. rm_at_fork() returns the
number of items removed (should be 0 or 1).
SEE ALSOfork(2)HISTORY
The at_fork() function appeared in FreeBSD 2.2.
AUTHORS
The function was written by Julian Elischer ⟨julian@FreeBSD.org⟩.
BSD August 15, 1996 BSD