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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright 2026 The FreeBSD Foundation
*
* This software were developed by
* Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
* the FreeBSD Foundation.
*/
#include <errno.h>
#include <unistd.h>
pid_t
rfork_thread(int flags, void *stack_addr, int (*start_fn)(void *), void *arg)
{
pid_t res;
int ret;
/*
* Generic implementation cannot switch stacks. Only
* architecture-specific code knows how to do it. Require
* that caller knows that, and refuse to do operate if the
* stack was supplied.
*
* Note that implementations that do switch stack, would fault
* immediately if the passed stack is NULL. They do not need to
* specifically check for the NULL stack value.
*/
if (stack_addr != NULL) {
errno = EOPNOTSUPP;
return (-1);
}
res = rfork(flags);
if (res == 0) {
ret = start_fn(arg);
_exit(ret);
}
return (res);
}
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