502 lines
12 KiB
C
502 lines
12 KiB
C
/* $NetBSD: linux_signal.c,v 1.9 1995/10/07 06:27:12 mycroft Exp $ */
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/*
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* Copyright (c) 1995 Frank van der Linden
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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 for the NetBSD Project
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* by Frank van der Linden
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/filedesc.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/kernel.h>
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#include <sys/signal.h>
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#include <sys/signalvar.h>
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#include <sys/malloc.h>
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#include <sys/syscallargs.h>
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#include <compat/linux/linux_types.h>
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#include <compat/linux/linux_signal.h>
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#include <compat/linux/linux_syscallargs.h>
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#include <compat/linux/linux_util.h>
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#define sigemptyset(s) bzero((s), sizeof(*(s)))
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#define sigismember(s, n) (*(s) & sigmask(n))
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#define sigaddset(s, n) (*(s) |= sigmask(n))
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#define linux_sigmask(n) (1 << ((n) - 1))
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#define linux_sigemptyset(s) bzero((s), sizeof(*(s)))
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#define linux_sigismember(s, n) (*(s) & linux_sigmask(n))
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#define linux_sigaddset(s, n) (*(s) |= linux_sigmask(n))
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int bsd_to_linux_sig[] = {
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0,
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LINUX_SIGHUP,
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LINUX_SIGINT,
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LINUX_SIGQUIT,
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LINUX_SIGILL,
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LINUX_SIGTRAP,
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LINUX_SIGABRT,
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0,
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LINUX_SIGFPE,
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LINUX_SIGKILL,
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LINUX_SIGBUS,
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LINUX_SIGSEGV,
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0,
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LINUX_SIGPIPE,
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LINUX_SIGALRM,
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LINUX_SIGTERM,
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LINUX_SIGURG,
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LINUX_SIGSTOP,
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LINUX_SIGTSTP,
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LINUX_SIGCONT,
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LINUX_SIGCHLD,
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LINUX_SIGTTIN,
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LINUX_SIGTTOU,
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LINUX_SIGIO,
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LINUX_SIGXCPU,
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LINUX_SIGXFSZ,
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LINUX_SIGVTALRM,
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LINUX_SIGPROF,
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LINUX_SIGWINCH,
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0,
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LINUX_SIGUSR1,
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LINUX_SIGUSR2,
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};
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int linux_to_bsd_sig[] = {
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0,
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SIGHUP,
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SIGINT,
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SIGQUIT,
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SIGILL,
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SIGTRAP,
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SIGABRT,
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SIGBUS,
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SIGFPE,
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SIGKILL,
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SIGUSR1,
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SIGSEGV,
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SIGUSR2,
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SIGPIPE,
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SIGALRM,
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SIGTERM,
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0,
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SIGCHLD,
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SIGCONT,
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SIGSTOP,
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SIGTSTP,
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SIGTTIN,
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SIGTTOU,
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SIGURG,
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SIGXCPU,
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SIGXFSZ,
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SIGVTALRM,
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SIGPROF,
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SIGWINCH,
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SIGIO,
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0,
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0,
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};
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/*
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* Ok, we know that Linux and BSD signals both are just an unsigned int.
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* Don't bother to use the sigismember() stuff for now.
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*/
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void
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linux_to_bsd_sigset(lss, bss)
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const linux_sigset_t *lss;
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sigset_t *bss;
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{
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int i, newsig;
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sigemptyset(bss);
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for (i = 1; i < LINUX_NSIG; i++) {
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if (linux_sigismember(lss, i)) {
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newsig = linux_to_bsd_sig[i];
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if (newsig)
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sigaddset(bss, newsig);
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}
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}
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}
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void
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bsd_to_linux_sigset(bss, lss)
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const sigset_t *bss;
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linux_sigset_t *lss;
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{
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int i, newsig;
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linux_sigemptyset(lss);
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for (i = 1; i < NSIG; i++) {
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if (sigismember(bss, i)) {
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newsig = bsd_to_linux_sig[i];
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if (newsig)
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linux_sigaddset(lss, newsig);
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}
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}
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}
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/*
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* Convert between Linux and BSD sigaction structures. Linux has
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* one extra field (sa_restorer) which we don't support.
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*/
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void
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linux_to_bsd_sigaction(lsa, bsa)
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struct linux_sigaction *lsa;
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struct sigaction *bsa;
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{
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bsa->sa_handler = lsa->sa_handler;
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linux_to_bsd_sigset(&bsa->sa_mask, &lsa->sa_mask);
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bsa->sa_flags = 0;
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if ((lsa->sa_flags & LINUX_SA_ONSTACK) != 0)
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bsa->sa_flags |= SA_ONSTACK;
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if ((lsa->sa_flags & LINUX_SA_RESTART) != 0)
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bsa->sa_flags |= SA_RESTART;
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if ((lsa->sa_flags & LINUX_SA_ONESHOT) != 0)
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bsa->sa_flags |= SA_RESETHAND;
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if ((lsa->sa_flags & LINUX_SA_NOCLDSTOP) != 0)
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bsa->sa_flags |= SA_NOCLDSTOP;
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if ((lsa->sa_flags & LINUX_SA_NOMASK) != 0)
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bsa->sa_flags |= SA_NODEFER;
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}
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void
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bsd_to_linux_sigaction(bsa, lsa)
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struct sigaction *bsa;
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struct linux_sigaction *lsa;
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{
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lsa->sa_handler = bsa->sa_handler;
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bsd_to_linux_sigset(&lsa->sa_mask, &bsa->sa_mask);
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lsa->sa_flags = 0;
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if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
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lsa->sa_flags |= LINUX_SA_NOCLDSTOP;
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if ((bsa->sa_flags & SA_ONSTACK) != 0)
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lsa->sa_flags |= LINUX_SA_ONSTACK;
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if ((bsa->sa_flags & SA_RESTART) != 0)
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lsa->sa_flags |= LINUX_SA_RESTART;
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if ((bsa->sa_flags & SA_NODEFER) != 0)
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lsa->sa_flags |= LINUX_SA_NOMASK;
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if ((bsa->sa_flags & SA_RESETHAND) != 0)
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lsa->sa_flags |= LINUX_SA_ONESHOT;
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lsa->sa_restorer = NULL;
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}
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/*
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* The Linux sigaction() system call. Do the usual conversions,
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* and just call sigaction(). Some flags and values are silently
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* ignored (see above).
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*/
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int
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linux_sys_sigaction(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_sigaction_args /* {
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syscallarg(int) signum;
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syscallarg(struct linux_sigaction *) nsa;
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syscallarg(struct linux_sigaction *) osa;
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} */ *uap = v;
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struct linux_sigaction *nlsa, *olsa, tmplsa;
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struct sigaction *nbsa, *obsa, tmpbsa;
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struct sys_sigaction_args sa;
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caddr_t sg;
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int error;
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sg = stackgap_init(p->p_emul);
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nlsa = SCARG(uap, nsa);
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olsa = SCARG(uap, osa);
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if (olsa != NULL)
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obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
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else
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obsa = NULL;
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if (nlsa != NULL) {
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nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
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if ((error = copyin(nlsa, &tmplsa, sizeof(tmplsa))) != 0)
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return error;
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linux_to_bsd_sigaction(&tmplsa, &tmpbsa);
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if ((error = copyout(&tmpbsa, nbsa, sizeof(tmpbsa))) != 0)
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return error;
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} else
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nbsa = NULL;
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SCARG(&sa, signum) = linux_to_bsd_sig[SCARG(uap, signum)];
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SCARG(&sa, nsa) = nbsa;
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SCARG(&sa, osa) = obsa;
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if ((error = sys_sigaction(p, &sa, retval)) != 0)
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return error;
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if (olsa != NULL) {
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if ((error = copyin(obsa, &tmpbsa, sizeof(tmpbsa))) != 0)
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return error;
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bsd_to_linux_sigaction(&tmpbsa, &tmplsa);
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if ((error = copyout(&tmplsa, olsa, sizeof(tmplsa))) != 0)
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return error;
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}
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return 0;
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}
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/*
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* The Linux signal() system call. I think that the signal() in the C
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* library actually calls sigaction, so I doubt this one is ever used.
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* But hey, it can't hurt having it here. The same restrictions as for
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* sigaction() apply.
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*/
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int
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linux_sys_signal(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_signal_args /* {
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syscallarg(int) sig;
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syscallarg(linux_handler_t) handler;
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} */ *uap = v;
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caddr_t sg;
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struct sys_sigaction_args sa_args;
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struct sigaction *osa, *nsa, tmpsa;
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int error;
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sg = stackgap_init(p->p_emul);
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nsa = stackgap_alloc(&sg, sizeof *nsa);
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osa = stackgap_alloc(&sg, sizeof *osa);
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tmpsa.sa_handler = SCARG(uap, handler);
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tmpsa.sa_mask = (sigset_t) 0;
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tmpsa.sa_flags = SA_RESETHAND | SA_NODEFER;
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if ((error = copyout(&tmpsa, nsa, sizeof tmpsa)))
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return error;
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SCARG(&sa_args, signum) = linux_to_bsd_sig[SCARG(uap, sig)];
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SCARG(&sa_args, osa) = osa;
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SCARG(&sa_args, nsa) = nsa;
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if ((error = sys_sigaction(p, &sa_args, retval)))
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return error;
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if ((error = copyin(osa, &tmpsa, sizeof *osa)))
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return error;
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retval[0] = (register_t) tmpsa.sa_handler;
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return 0;
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}
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/*
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* This is just a copy of the svr4 compat one. I feel so creative now.
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*/
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int
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linux_sys_sigprocmask(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_sigprocmask_args /* {
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syscallarg(int) how;
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syscallarg(linux_sigset_t *) set;
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syscallarg(linux_sigset_t *) oset;
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} */ *uap = v;
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linux_sigset_t ss;
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sigset_t bs;
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int error = 0;
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*retval = 0;
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if (SCARG(uap, oset) != NULL) {
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/* Fix the return value first if needed */
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bsd_to_linux_sigset(&p->p_sigmask, &ss);
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if ((error = copyout(&ss, SCARG(uap, oset), sizeof(ss))) != 0)
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return error;
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}
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if (SCARG(uap, set) == NULL)
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/* Just examine */
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return 0;
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if ((error = copyin(SCARG(uap, set), &ss, sizeof(ss))) != 0)
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return error;
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linux_to_bsd_sigset(&ss, &bs);
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(void) splhigh();
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switch (SCARG(uap, how)) {
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case LINUX_SIG_BLOCK:
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p->p_sigmask |= bs & ~sigcantmask;
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break;
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case LINUX_SIG_UNBLOCK:
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p->p_sigmask &= ~bs;
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break;
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case LINUX_SIG_SETMASK:
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p->p_sigmask = bs & ~sigcantmask;
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break;
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default:
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error = EINVAL;
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break;
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}
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(void) spl0();
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return error;
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}
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/*
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* The functions below really make no distinction between an int
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* and [linux_]sigset_t. This is ok for now, but it might break
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* sometime. Then again, sigset_t is trusted to be an int everywhere
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* else in the kernel too.
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*/
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/* ARGSUSED */
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int
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linux_sys_siggetmask(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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bsd_to_linux_sigset(&p->p_sigmask, (linux_sigset_t *)retval);
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return 0;
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}
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/*
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* The following three functions fiddle with a process' signal mask.
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* Convert the signal masks because of the different signal
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* values for Linux. The need for this is the reason why
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* they are here, and have not been mapped directly.
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*/
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int
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linux_sys_sigsetmask(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_sigsetmask_args /* {
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syscallarg(linux_sigset_t) mask;
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} */ *uap = v;
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linux_sigset_t mask;
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sigset_t bsdsig;
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bsd_to_linux_sigset(&p->p_sigmask, (linux_sigset_t *)retval);
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mask = SCARG(uap, mask);
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bsd_to_linux_sigset(&mask, &bsdsig);
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splhigh();
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p->p_sigmask = bsdsig & ~sigcantmask;
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spl0();
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return 0;
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}
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int
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linux_sys_sigpending(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_sigpending_args /* {
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syscallarg(linux_sigset_t *) mask;
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} */ *uap = v;
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sigset_t bs;
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linux_sigset_t ls;
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bs = p->p_siglist & p->p_sigmask;
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bsd_to_linux_sigset(&bs, &ls);
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return copyout(&ls, SCARG(uap, mask), sizeof(ls));
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}
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int
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linux_sys_sigsuspend(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_sigsuspend_args /* {
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syscallarg(caddr_t) restart;
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syscallarg(int) oldmask;
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syscallarg(int) mask;
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} */ *uap = v;
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struct sys_sigsuspend_args sa;
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linux_to_bsd_sigset(&SCARG(uap, mask), &SCARG(&sa, mask));
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return sys_sigsuspend(p, &sa, retval);
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}
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/*
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* The deprecated pause(2), which is really just an instance
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* of sigsuspend(2).
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*/
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int
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linux_sys_pause(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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struct sys_sigsuspend_args bsa;
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SCARG(&bsa, mask) = p->p_sigmask;
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return sys_sigsuspend(p, &bsa, retval);
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}
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/*
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* Once more: only a signal conversion is needed.
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*/
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int
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linux_sys_kill(p, v, retval)
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register struct proc *p;
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void *v;
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register_t *retval;
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{
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struct linux_sys_kill_args /* {
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syscallarg(int) pid;
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syscallarg(int) signum;
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} */ *uap = v;
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struct sys_kill_args ka;
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SCARG(&ka, pid) = SCARG(uap, pid);
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SCARG(&ka, signum) = linux_to_bsd_sig[SCARG(uap, signum)];
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return sys_kill(p, &ka, retval);
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}
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