diff options
Diffstat (limited to 'share/man/man9/at_fork.9')
-rw-r--r-- | share/man/man9/at_fork.9 | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/share/man/man9/at_fork.9 b/share/man/man9/at_fork.9 new file mode 100644 index 0000000..1c13750 --- /dev/null +++ b/share/man/man9/at_fork.9 @@ -0,0 +1,83 @@ +.\" +.\" Copyright (c) 1996 Julian Elischer +.\" +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR +.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, +.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +.\" +.\" $Id: at_fork.9,v 1.1 1996/04/13 16:59:07 joerg Exp $ +.\" " +.Dd August 15, 1996 +.Os +.Dt AT_FORK 9 +.Sh NAME +.Nm at_fork , +.Nm rm_at_fork +.Nd ask that a function be run at fork. +.Sh SYNOPSIS +.Fd #include <sys/systm.h> + +.Ft typedef void \*(lp*forklist_fn\*(rp \*(lpstruct proc*, struct proc*, int\*(rp; + + +.Ft void +.Fn at_fork "forklist_fn func" +.Ft void +.Fn rm_at_fork "forklist_fn func" +.Sh DESCRIPTION +The +.Nm at_fork +facility allows a kernel module to ensure that it is notified +at any process fork. +The function +.Ar 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 +.Xr rfork 2 +to indicate the type of fork. +.Pp +If the requirement for notification is removed, then the function +.Nm rm_at_fork +must be called with the exact +.Ar func +argument as the corresponding call to +.Fn at_fork . +.Pp +.Sh RETURN VALUES +.Nm at_fork +returns an errno, 0 meaning success. +.Nm rm_at_fork +returns the number of items removed (should be 0 or 1). +.Sh SEE ALSO +.Xr fork 2 +.Sh HISTORY +The +.Nm at_fork +appeared in FreeBSD 2.2 +.Sh BUGS +Since the fork queue is not sorted +and items are added to the head, order of execution +is reversed to that of insertion. +.Sh AUTHORS +The function was written by +.ie Julian Elischer (julian@freebsd.org) +.el Julian Elischer (julian@freebsd.org) |