1.\" 2.\" Copyright (c) 2000 Peter Wemm <peter@FreeBSD.org> 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.Dd February 6, 2011 27.Dt RFORK_THREAD 3 28.Os 29.Sh NAME 30.Nm rfork_thread 31.Nd create a rfork-based process thread 32.Sh LIBRARY 33.Lb libc 34.Sh SYNOPSIS 35.In unistd.h 36.Ft pid_t 37.Fn rfork_thread "int flags" "void *stack" "int (*func)(void *arg)" "void *arg" 38.Sh DESCRIPTION 39.Bf -symbolic 40The 41.Fn rfork_thread 42function has been deprecated in favor of 43.Xr pthread_create 3 . 44.Ef 45.Pp 46The 47.Fn rfork_thread 48function 49is a helper function for 50.Xr rfork 2 . 51It arranges for a new process to be created and the child process will 52call the specified function with the specified argument, while running on 53the supplied stack. 54.Pp 55Using this function should avoid the need to implement complex stack 56swap code. 57.Sh RETURN VALUES 58Upon successful completion, 59.Fn rfork_thread 60returns the process ID of the child process to the parent process. 61Otherwise, a value of -1 is returned 62to the parent process, no child process is created, and the global 63variable 64.Va errno 65is set to indicate the error. 66.Pp 67The child process context is not aware of a return from the 68.Fn rfork_thread 69function as it begins executing directly with the supplied function. 70.Sh ERRORS 71See 72.Xr rfork 2 73for error return codes. 74.Sh SEE ALSO 75.Xr fork 2 , 76.Xr intro 2 , 77.Xr minherit 2 , 78.Xr rfork 2 , 79.Xr vfork 2 , 80.Xr pthread_create 3 81.Sh HISTORY 82The 83.Fn rfork_thread 84function first appeared in 85.Fx 4.3 . 86