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AT_FORK(9)	      DragonFly 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 VALUES

at_fork() returns an errno, 0 meaning success. rm_at_fork() returns the number of items removed (should be 0 or 1).

SEE ALSO

fork(2)

HISTORY

The at_fork() function appeared in FreeBSD 2.2.

AUTHORS

The function was written by Julian Elischer <julian@FreeBSD.org>. DragonFly 4.1 August 15, 1996 DragonFly 4.1