574 lines
14 KiB
C
574 lines
14 KiB
C
/* $NetBSD: svr4_signal.c,v 1.53 2005/12/24 20:45:08 perry Exp $ */
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/*-
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* Copyright (c) 1994, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas and by Charles M. Hannum.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: svr4_signal.c,v 1.53 2005/12/24 20:45:08 perry Exp $");
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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/wait.h>
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#include <sys/sa.h>
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#include <sys/syscallargs.h>
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#include <uvm/uvm_extern.h>
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#include <compat/svr4/svr4_types.h>
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#include <compat/svr4/svr4_signal.h>
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#include <compat/svr4/svr4_lwp.h>
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#include <compat/svr4/svr4_ucontext.h>
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#include <compat/svr4/svr4_syscallargs.h>
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#include <compat/svr4/svr4_util.h>
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#include <compat/svr4/svr4_ucontext.h>
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#define svr4_sigmask(n) (1 << (((n) - 1) & 31))
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#define svr4_sigword(n) (((n) - 1) >> 5)
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#define svr4_sigemptyset(s) memset((s), 0, sizeof(*(s)))
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#define svr4_sigismember(s, n) ((s)->bits[svr4_sigword(n)] & svr4_sigmask(n))
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#define svr4_sigaddset(s, n) ((s)->bits[svr4_sigword(n)] |= svr4_sigmask(n))
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static inline void svr4_sigfillset __P((svr4_sigset_t *));
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void svr4_to_native_sigaction __P((const struct svr4_sigaction *,
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struct sigaction *));
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void native_to_svr4_sigaction __P((const struct sigaction *,
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struct svr4_sigaction *));
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extern const int native_to_svr4_signo[];
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extern const int svr4_to_native_signo[];
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static inline void
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svr4_sigfillset(s)
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svr4_sigset_t *s;
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{
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int i;
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svr4_sigemptyset(s);
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for (i = 1; i < SVR4_NSIG; i++)
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if (svr4_to_native_signo[i] != 0)
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svr4_sigaddset(s, i);
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}
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void
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svr4_to_native_sigset(sss, bss)
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const svr4_sigset_t *sss;
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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 < SVR4_NSIG; i++) {
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if (svr4_sigismember(sss, i)) {
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newsig = svr4_to_native_signo[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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native_to_svr4_sigset(bss, sss)
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const sigset_t *bss;
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svr4_sigset_t *sss;
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{
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int i, newsig;
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svr4_sigemptyset(sss);
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for (i = 1; i < NSIG; i++) {
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if (sigismember(bss, i)) {
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newsig = native_to_svr4_signo[i];
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if (newsig)
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svr4_sigaddset(sss, newsig);
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}
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}
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}
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/*
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* XXX: Only a subset of the flags is currently implemented.
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*/
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void
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svr4_to_native_sigaction(ssa, bsa)
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const struct svr4_sigaction *ssa;
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struct sigaction *bsa;
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{
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bsa->sa_handler = (sig_t) ssa->svr4_sa_handler;
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svr4_to_native_sigset(&ssa->svr4_sa_mask, &bsa->sa_mask);
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bsa->sa_flags = 0;
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if ((ssa->svr4_sa_flags & SVR4_SA_ONSTACK) != 0)
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bsa->sa_flags |= SA_ONSTACK;
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if ((ssa->svr4_sa_flags & SVR4_SA_RESETHAND) != 0)
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bsa->sa_flags |= SA_RESETHAND;
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if ((ssa->svr4_sa_flags & SVR4_SA_RESTART) != 0)
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bsa->sa_flags |= SA_RESTART;
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if ((ssa->svr4_sa_flags & SVR4_SA_SIGINFO) != 0)
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bsa->sa_flags |= SA_SIGINFO;
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if ((ssa->svr4_sa_flags & SVR4_SA_NODEFER) != 0)
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bsa->sa_flags |= SA_NODEFER;
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if ((ssa->svr4_sa_flags & SVR4_SA_NOCLDWAIT) != 0)
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bsa->sa_flags |= SA_NOCLDWAIT;
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if ((ssa->svr4_sa_flags & SVR4_SA_NOCLDSTOP) != 0)
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bsa->sa_flags |= SA_NOCLDSTOP;
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if ((ssa->svr4_sa_flags & ~SVR4_SA_ALLBITS) != 0)
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DPRINTF(("svr4_to_native_sigaction: extra bits %x ignored\n",
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ssa->svr4_sa_flags & ~SVR4_SA_ALLBITS));
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}
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void
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native_to_svr4_sigaction(bsa, ssa)
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const struct sigaction *bsa;
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struct svr4_sigaction *ssa;
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{
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ssa->svr4_sa_handler = (svr4_sig_t) bsa->sa_handler;
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native_to_svr4_sigset(&bsa->sa_mask, &ssa->svr4_sa_mask);
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ssa->svr4_sa_flags = 0;
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if ((bsa->sa_flags & SA_ONSTACK) != 0)
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ssa->svr4_sa_flags |= SVR4_SA_ONSTACK;
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if ((bsa->sa_flags & SA_RESETHAND) != 0)
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ssa->svr4_sa_flags |= SVR4_SA_RESETHAND;
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if ((bsa->sa_flags & SA_RESTART) != 0)
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ssa->svr4_sa_flags |= SVR4_SA_RESTART;
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if ((bsa->sa_flags & SA_NODEFER) != 0)
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ssa->svr4_sa_flags |= SVR4_SA_NODEFER;
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if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
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ssa->svr4_sa_flags |= SVR4_SA_NOCLDSTOP;
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}
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void
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svr4_to_native_sigaltstack(sss, bss)
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const struct svr4_sigaltstack *sss;
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struct sigaltstack *bss;
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{
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bss->ss_sp = sss->ss_sp;
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bss->ss_size = sss->ss_size;
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bss->ss_flags = 0;
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if ((sss->ss_flags & SVR4_SS_DISABLE) != 0)
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bss->ss_flags |= SS_DISABLE;
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if ((sss->ss_flags & SVR4_SS_ONSTACK) != 0)
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bss->ss_flags |= SS_ONSTACK;
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if ((sss->ss_flags & ~SVR4_SS_ALLBITS) != 0)
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/*XXX*/ printf("svr4_to_native_sigaltstack: extra bits %x ignored\n",
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sss->ss_flags & ~SVR4_SS_ALLBITS);
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}
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void
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native_to_svr4_sigaltstack(bss, sss)
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const struct sigaltstack *bss;
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struct svr4_sigaltstack *sss;
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{
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sss->ss_sp = bss->ss_sp;
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sss->ss_size = bss->ss_size;
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sss->ss_flags = 0;
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if ((bss->ss_flags & SS_DISABLE) != 0)
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sss->ss_flags |= SVR4_SS_DISABLE;
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if ((bss->ss_flags & SS_ONSTACK) != 0)
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sss->ss_flags |= SVR4_SS_ONSTACK;
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}
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int
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svr4_sys_sigaction(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct svr4_sys_sigaction_args /* {
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syscallarg(int) signum;
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syscallarg(const struct svr4_sigaction *) nsa;
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syscallarg(struct svr4_sigaction *) osa;
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} */ *uap = v;
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struct proc *p = l->l_proc;
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struct svr4_sigaction nssa, ossa;
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struct sigaction nbsa, obsa;
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int error;
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if (SCARG(uap, nsa)) {
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error = copyin(SCARG(uap, nsa), &nssa, sizeof(nssa));
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if (error)
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return (error);
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svr4_to_native_sigaction(&nssa, &nbsa);
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}
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error = sigaction1(p, svr4_to_native_signo[SVR4_SIGNO(SCARG(uap, signum))],
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SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0,
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NULL, 0);
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if (error)
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return (error);
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if (SCARG(uap, osa)) {
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native_to_svr4_sigaction(&obsa, &ossa);
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error = copyout(&ossa, SCARG(uap, osa), sizeof(ossa));
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if (error)
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return (error);
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}
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return (0);
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}
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int
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svr4_sys_sigaltstack(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct svr4_sys_sigaltstack_args /* {
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syscallarg(const struct svr4_sigaltstack *) nss;
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syscallarg(struct svr4_sigaltstack *) oss;
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} */ *uap = v;
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struct svr4_sigaltstack nsss, osss;
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struct sigaltstack nbss, obss;
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int error;
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if (SCARG(uap, nss)) {
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error = copyin(SCARG(uap, nss), &nsss, sizeof(nsss));
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if (error)
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return (error);
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svr4_to_native_sigaltstack(&nsss, &nbss);
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}
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error = sigaltstack1(l->l_proc,
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SCARG(uap, nss) ? &nbss : 0, SCARG(uap, oss) ? &obss : 0);
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if (error)
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return (error);
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if (SCARG(uap, oss)) {
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native_to_svr4_sigaltstack(&obss, &osss);
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error = copyout(&osss, SCARG(uap, oss), sizeof(osss));
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if (error)
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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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* Stolen from the ibcs2 one
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*/
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int
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svr4_sys_signal(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct svr4_sys_signal_args /* {
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syscallarg(int) signum;
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syscallarg(svr4_sig_t) handler;
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} */ *uap = v;
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struct proc *p = l->l_proc;
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int signum = svr4_to_native_signo[SVR4_SIGNO(SCARG(uap, signum))];
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struct sigaction nbsa, obsa;
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sigset_t ss;
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int error;
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if (signum <= 0 || signum >= SVR4_NSIG)
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return (EINVAL);
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switch (SVR4_SIGCALL(SCARG(uap, signum))) {
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case SVR4_SIGDEFER_MASK:
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if (SCARG(uap, handler) == SVR4_SIG_HOLD)
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goto sighold;
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/* FALLTHROUGH */
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case SVR4_SIGNAL_MASK:
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nbsa.sa_handler = (sig_t)SCARG(uap, handler);
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sigemptyset(&nbsa.sa_mask);
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nbsa.sa_flags = 0;
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error = sigaction1(p, signum, &nbsa, &obsa, NULL, 0);
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if (error)
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return (error);
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*retval = (u_int)(u_long)obsa.sa_handler;
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return (0);
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case SVR4_SIGHOLD_MASK:
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sighold:
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sigemptyset(&ss);
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sigaddset(&ss, signum);
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return (sigprocmask1(p, SIG_BLOCK, &ss, 0));
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case SVR4_SIGRELSE_MASK:
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sigemptyset(&ss);
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sigaddset(&ss, signum);
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return (sigprocmask1(p, SIG_UNBLOCK, &ss, 0));
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case SVR4_SIGIGNORE_MASK:
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nbsa.sa_handler = SIG_IGN;
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sigemptyset(&nbsa.sa_mask);
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nbsa.sa_flags = 0;
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return (sigaction1(p, signum, &nbsa, 0, NULL, 0));
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case SVR4_SIGPAUSE_MASK:
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ss = p->p_sigctx.ps_sigmask;
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sigdelset(&ss, signum);
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return (sigsuspend1(p, &ss));
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default:
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return (ENOSYS);
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}
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}
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int
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svr4_sys_sigprocmask(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct svr4_sys_sigprocmask_args /* {
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syscallarg(int) how;
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syscallarg(const svr4_sigset_t *) set;
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syscallarg(svr4_sigset_t *) oset;
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} */ *uap = v;
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svr4_sigset_t nsss, osss;
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sigset_t nbss, obss;
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int how;
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int error;
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/*
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* Initialize how to 0 to avoid a compiler warning. Note that
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* this is safe because of the check in the default: case.
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*/
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how = 0;
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switch (SCARG(uap, how)) {
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case SVR4_SIG_BLOCK:
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how = SIG_BLOCK;
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break;
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case SVR4_SIG_UNBLOCK:
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how = SIG_UNBLOCK;
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break;
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case SVR4_SIG_SETMASK:
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how = SIG_SETMASK;
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break;
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default:
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if (SCARG(uap, set))
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return EINVAL;
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break;
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}
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if (SCARG(uap, set)) {
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error = copyin(SCARG(uap, set), &nsss, sizeof(nsss));
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if (error)
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return error;
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svr4_to_native_sigset(&nsss, &nbss);
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}
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error = sigprocmask1(l->l_proc, how,
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SCARG(uap, set) ? &nbss : NULL, SCARG(uap, oset) ? &obss : NULL);
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if (error)
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return error;
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if (SCARG(uap, oset)) {
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native_to_svr4_sigset(&obss, &osss);
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error = copyout(&osss, SCARG(uap, oset), sizeof(osss));
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if (error)
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return error;
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}
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return 0;
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}
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int
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svr4_sys_sigpending(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct svr4_sys_sigpending_args /* {
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syscallarg(int) what;
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syscallarg(svr4_sigset_t *) set;
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} */ *uap = v;
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sigset_t bss;
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svr4_sigset_t sss;
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switch (SCARG(uap, what)) {
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case 1: /* sigpending */
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sigpending1(l->l_proc, &bss);
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native_to_svr4_sigset(&bss, &sss);
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break;
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case 2: /* sigfillset */
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svr4_sigfillset(&sss);
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break;
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default:
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return (EINVAL);
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}
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return (copyout(&sss, SCARG(uap, set), sizeof(sss)));
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}
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int
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svr4_sys_sigsuspend(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct svr4_sys_sigsuspend_args /* {
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syscallarg(const svr4_sigset_t *) set;
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} */ *uap = v;
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svr4_sigset_t sss;
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sigset_t bss;
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int error;
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if (SCARG(uap, set)) {
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error = copyin(SCARG(uap, set), &sss, sizeof(sss));
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if (error)
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return (error);
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svr4_to_native_sigset(&sss, &bss);
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}
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return (sigsuspend1(l->l_proc, SCARG(uap, set) ? &bss : 0));
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}
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int
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svr4_sys_pause(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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return (sigsuspend1(l->l_proc, 0));
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}
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int
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svr4_sys_kill(l, v, retval)
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struct lwp *l;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct svr4_sys_kill_args /* {
|
|
syscallarg(int) pid;
|
|
syscallarg(int) signum;
|
|
} */ *uap = v;
|
|
struct sys_kill_args ka;
|
|
|
|
SCARG(&ka, pid) = SCARG(uap, pid);
|
|
SCARG(&ka, signum) = svr4_to_native_signo[SVR4_SIGNO(SCARG(uap, signum))];
|
|
return sys_kill(l, &ka, retval);
|
|
}
|
|
|
|
void
|
|
svr4_getcontext(l, uc)
|
|
struct lwp *l;
|
|
struct svr4_ucontext *uc;
|
|
{
|
|
sigset_t mask;
|
|
struct proc *p = l->l_proc;
|
|
|
|
svr4_getmcontext(l, &uc->uc_mcontext, &uc->uc_flags);
|
|
uc->uc_link = l->l_ctxlink;
|
|
/*
|
|
* The (unsupplied) definition of the `current execution stack'
|
|
* in the System V Interface Definition appears to allow returning
|
|
* the main context stack.
|
|
*/
|
|
if ((p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK) == 0) {
|
|
uc->uc_stack.ss_sp = (void *)USRSTACK;
|
|
uc->uc_stack.ss_size = ctob(p->p_vmspace->vm_ssize);
|
|
uc->uc_stack.ss_flags = 0; /* XXX, def. is Very Fishy */
|
|
} else {
|
|
/* Simply copy alternate signal execution stack. */
|
|
uc->uc_stack.ss_sp = p->p_sigctx.ps_sigstk.ss_sp;
|
|
uc->uc_stack.ss_size = p->p_sigctx.ps_sigstk.ss_size;
|
|
uc->uc_stack.ss_flags = p->p_sigctx.ps_sigstk.ss_flags;
|
|
}
|
|
|
|
(void)sigprocmask1(p, 0, NULL, &mask);
|
|
native_to_svr4_sigset(&mask, &uc->uc_sigmask);
|
|
|
|
uc->uc_flags |= _UC_SIGMASK | _UC_STACK;
|
|
}
|
|
|
|
|
|
int
|
|
svr4_setcontext(l, uc)
|
|
struct lwp *l;
|
|
struct svr4_ucontext *uc;
|
|
{
|
|
sigset_t mask;
|
|
struct proc *p = l->l_proc;
|
|
|
|
if (uc->uc_flags & _UC_SIGMASK) {
|
|
svr4_to_native_sigset(&uc->uc_sigmask, &mask);
|
|
sigprocmask1(p, SIG_SETMASK, &mask, NULL);
|
|
}
|
|
|
|
/* Ignore the stack; see comment in svr4_getcontext. */
|
|
|
|
l->l_ctxlink = uc->uc_link;
|
|
svr4_setmcontext(l, &uc->uc_mcontext, uc->uc_flags);
|
|
|
|
return EJUSTRETURN;
|
|
}
|
|
|
|
int
|
|
svr4_sys_context(l, v, retval)
|
|
struct lwp *l;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct svr4_sys_context_args /* {
|
|
syscallarg(int) func;
|
|
syscallarg(struct svr4_ucontext *) uc;
|
|
} */ *uap = v;
|
|
int error;
|
|
svr4_ucontext_t uc;
|
|
*retval = 0;
|
|
|
|
switch (SCARG(uap, func)) {
|
|
case SVR4_GETCONTEXT:
|
|
DPRINTF(("getcontext(%p)\n", SCARG(uap, uc)));
|
|
svr4_getcontext(l, &uc);
|
|
return (copyout(&uc, SCARG(uap, uc), sizeof (*SCARG(uap, uc))));
|
|
|
|
|
|
case SVR4_SETCONTEXT:
|
|
DPRINTF(("setcontext(%p)\n", SCARG(uap, uc)));
|
|
error = copyin(SCARG(uap, uc), &uc, sizeof (uc));
|
|
if (error)
|
|
return (error);
|
|
svr4_setcontext(l, &uc);
|
|
return EJUSTRETURN;
|
|
|
|
default:
|
|
DPRINTF(("context(%d, %p)\n", SCARG(uap, func),
|
|
SCARG(uap, uc)));
|
|
return ENOSYS;
|
|
}
|
|
}
|