2000-07-29 12:12:39 +00:00
|
|
|
.\"
|
|
|
|
|
.\" Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
|
|
|
|
|
.\" 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
2000-12-11 15:15:20 +00:00
|
|
|
.Dd July 29, 2000
|
2000-07-29 12:12:39 +00:00
|
|
|
.Dt RFORK_THREAD 3
|
|
|
|
|
.Os
|
|
|
|
|
.Sh NAME
|
|
|
|
|
.Nm rfork_thread
|
|
|
|
|
.Nd create a rfork-based process thread
|
|
|
|
|
.Sh LIBRARY
|
|
|
|
|
.Lb libc
|
|
|
|
|
.Sh SYNOPSIS
|
2001-10-01 16:09:29 +00:00
|
|
|
.In unistd.h
|
2003-04-27 21:07:27 +00:00
|
|
|
.Ft pid_t
|
2000-07-29 12:12:39 +00:00
|
|
|
.Fn rfork_thread "int flags" "void *stack" "int (*func)(void *arg)" "void *arg"
|
|
|
|
|
.Sh DESCRIPTION
|
2002-12-18 10:13:54 +00:00
|
|
|
The
|
2001-08-01 12:04:32 +00:00
|
|
|
.Fn rfork_thread
|
2002-12-18 10:13:54 +00:00
|
|
|
function
|
2000-07-29 12:12:39 +00:00
|
|
|
is a helper function for
|
|
|
|
|
.Xr rfork 2 .
|
|
|
|
|
It arranges for a new process to be created and the child process will
|
|
|
|
|
call the specified function with the specified argument, while running on
|
|
|
|
|
the supplied stack.
|
|
|
|
|
.Pp
|
|
|
|
|
Using this function should avoid the need to implement complex stack
|
|
|
|
|
swap code.
|
|
|
|
|
.Sh RETURN VALUES
|
|
|
|
|
Upon successful completion,
|
2001-08-01 12:04:32 +00:00
|
|
|
.Fn rfork_thread
|
2000-07-29 12:12:39 +00:00
|
|
|
returns the process ID of the child process to the parent process.
|
|
|
|
|
Otherwise, a value of -1 is returned
|
|
|
|
|
to the parent process, no child process is created, and the global
|
|
|
|
|
variable
|
|
|
|
|
.Va errno
|
|
|
|
|
is set to indicate the error.
|
|
|
|
|
.Pp
|
|
|
|
|
The child process context is not aware of a return from the
|
2001-08-01 12:04:32 +00:00
|
|
|
.Fn rfork_thread
|
2000-07-29 12:12:39 +00:00
|
|
|
function as it begins executing directly with the supplied function.
|
|
|
|
|
.Sh ERRORS
|
|
|
|
|
See
|
|
|
|
|
.Xr rfork 2
|
|
|
|
|
for error return codes.
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr fork 2 ,
|
|
|
|
|
.Xr intro 2 ,
|
|
|
|
|
.Xr minherit 2 ,
|
|
|
|
|
.Xr rfork 2 ,
|
|
|
|
|
.Xr vfork 2
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
The
|
2001-08-01 12:04:32 +00:00
|
|
|
.Fn rfork_thread
|
2002-12-18 10:13:54 +00:00
|
|
|
function first appeared in
|
2001-08-01 12:15:21 +00:00
|
|
|
.Fx 4.3 .
|
