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/*
* Copyright (c) 1999 Richard Seaman, Jr.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Richard Seaman, Jr.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RICHARD SEAMAN, Jr. 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 REGENTS 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.
*
*/
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/unistd.h>
#include <errno.h>
#include <clone.h>
int clone (int (*__fn) (void *), void *__child_stack,
int __flags, void *__arg) __attribute__ ((weak, alias("__clone")));
extern int __clone (int (*__fn) (void *), void *__child_stack,
int __flags, void *__arg)
{
int bsd_flags;
int exit_signal;
/* We don't have qn equivalent to CLONE_PID yet */
if (__flags & CLONE_PID)
return (-1);
if (__child_stack == (void *)0)
return (-1);
/* RFTHREAD probably not necessary here, but it shouldn't hurt either */
bsd_flags = RFPROC | RFTHREAD;
/* We only allow one alternative to SIGCHLD, and thats
* SIGUSR1. This is less flexible than Linux, but
* we don't really have a way to pass a one byte
* exit signal to rfork, which is what Linux passes to
* its clone syscall. OTOH, we haven't seen Linux use
* a value other than 0 (which implies SIGCHLD), SIGCHLD,
* or SIGUSER1 so far.
*/
exit_signal = ((unsigned int)__flags) & CSIGNAL;
switch (exit_signal){
case 0:
case SIGCHLD:
/* SIGCHLD is the default for BSD, so we don't have
* to do anything special in this case.
*/
break;
case SIGUSR1:
bsd_flags |= RFLINUXTHPN;
break;
default:
return (-1);
}
if (__flags & CLONE_VM)
bsd_flags |= RFMEM;
if (__flags & CLONE_SIGHAND)
bsd_flags |= RFSIGSHARE;
if (!(__flags & CLONE_FILES))
bsd_flags |= RFFDG;
/* _clone is in clone.S, and takes bsd style rfork flags */
return (_clone (__fn, __child_stack, bsd_flags, __arg));
}
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