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1c274b738e
still some problems, at least with signal handling and locking on SMP. Submitted by: dick
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*
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* Copyright (c) 1999 Richard Seaman, Jr.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Richard Seaman, Jr.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY RICHARD SEAMAN, Jr. 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 REGENTS 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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*/
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#include <sys/types.h>
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#include <sys/signal.h>
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#include <sys/unistd.h>
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#include <errno.h>
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#include <clone.h>
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#pragma weak clone=__clone
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extern int __clone __P ((int (*__fn) (void *), void *__child_stack,
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int __flags, void *__arg))
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{
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int bsd_flags;
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int exit_signal;
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/* We don't have qn equivalent to CLONE_PID yet */
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if (__flags & CLONE_PID)
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return (-1);
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if (__child_stack == (void *)0)
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return (-1);
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/* RFTHREAD probably not necessary here, but it shouldn't hurt either */
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bsd_flags = RFPROC | RFTHREAD;
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/* We only allow one alternative to SIGCHLD, and thats
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* SIGUSR1. This is less flexible than Linux, but
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* we don't really have a way to pass a one byte
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* exit signal to rfork, which is what Linux passes to
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* its clone syscall. OTOH, we haven't seen Linux use
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* a value other than 0 (which implies SIGCHLD), SIGCHLD,
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* or SIGUSER1 so far.
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*/
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exit_signal = ((unsigned int)__flags) & CSIGNAL;
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switch (exit_signal){
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case 0:
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case SIGCHLD:
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/* SIGCHLD is the default for BSD, so we don't have
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* to do anything special in this case.
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*/
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break;
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case SIGUSR1:
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bsd_flags |= RFLINUXTHPN;
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break;
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default:
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return (-1);
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}
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if (__flags & CLONE_VM)
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bsd_flags |= RFMEM;
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if (__flags & CLONE_SIGHAND)
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bsd_flags |= RFSIGSHARE;
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if (!(__flags & CLONE_FILES))
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bsd_flags |= RFFDG;
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/* _clone is in clone.S, and takes bsd style rfork flags */
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return (_clone (__fn, __child_stack, bsd_flags, __arg));
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}
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