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80 lines
2.6 KiB
Groff
80 lines
2.6 KiB
Groff
.\"
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.\" Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 29, 2000
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.Dt RFORK_THREAD 3
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.Os
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.Sh NAME
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.Nm rfork_thread
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.Nd create a rfork-based process thread
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft pid_t
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.Fn rfork_thread "int flags" "void *stack" "int (*func)(void *arg)" "void *arg"
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.Sh DESCRIPTION
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The
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.Fn rfork_thread
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function
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is a helper function for
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.Xr rfork 2 .
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It arranges for a new process to be created and the child process will
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call the specified function with the specified argument, while running on
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the supplied stack.
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.Pp
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Using this function should avoid the need to implement complex stack
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swap code.
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.Sh RETURN VALUES
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Upon successful completion,
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.Fn rfork_thread
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returns the process ID of the child process to the parent process.
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Otherwise, a value of -1 is returned
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to the parent process, no child process is created, and the global
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variable
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.Va errno
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is set to indicate the error.
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.Pp
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The child process context is not aware of a return from the
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.Fn rfork_thread
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function as it begins executing directly with the supplied function.
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.Sh ERRORS
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See
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.Xr rfork 2
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for error return codes.
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.Sh SEE ALSO
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.Xr fork 2 ,
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.Xr intro 2 ,
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.Xr minherit 2 ,
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.Xr rfork 2 ,
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.Xr vfork 2
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.Sh HISTORY
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The
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.Fn rfork_thread
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function first appeared in
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.Fx 4.3 .
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