rm_at_fork man page on DragonFly

rm_at_fork man page on DragonFly

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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 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⟩.

BSD				August 15, 1996				   BSD

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