1.\" 2.\" Copyright (c) 2000 Peter Wemm <[email protected]> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd February 6, 2011 29.Dt RFORK_THREAD 3 30.Os 31.Sh NAME 32.Nm rfork_thread 33.Nd create a rfork-based process thread 34.Sh LIBRARY 35.Lb libc 36.Sh SYNOPSIS 37.In unistd.h 38.Ft pid_t 39.Fn rfork_thread "int flags" "void *stack" "int (*func)(void *arg)" "void *arg" 40.Sh DESCRIPTION 41.Bf -symbolic 42The 43.Fn rfork_thread 44function has been deprecated in favor of 45.Xr pthread_create 3 . 46.Ef 47.Pp 48The 49.Fn rfork_thread 50function 51is a helper function for 52.Xr rfork 2 . 53It arranges for a new process to be created and the child process will 54call the specified function with the specified argument, while running on 55the supplied stack. 56.Pp 57Using this function should avoid the need to implement complex stack 58swap code. 59.Sh RETURN VALUES 60Upon successful completion, 61.Fn rfork_thread 62returns the process ID of the child process to the parent process. 63Otherwise, a value of -1 is returned 64to the parent process, no child process is created, and the global 65variable 66.Va errno 67is set to indicate the error. 68.Pp 69The child process context is not aware of a return from the 70.Fn rfork_thread 71function as it begins executing directly with the supplied function. 72.Sh ERRORS 73See 74.Xr rfork 2 75for error return codes. 76.Sh SEE ALSO 77.Xr fork 2 , 78.Xr intro 2 , 79.Xr minherit 2 , 80.Xr rfork 2 , 81.Xr vfork 2 , 82.Xr pthread_create 3 83.Sh HISTORY 84The 85.Fn rfork_thread 86function first appeared in 87.Fx 4.3 . 88