543 lines
13 KiB
C
543 lines
13 KiB
C
/* $NetBSD: linux_sigarray.c,v 1.5 1995/06/24 20:20:30 christos 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_syscallargs.h>
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#include <compat/linux/linux_util.h>
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#include <compat/linux/linux_signal.h>
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/*
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* Most of ths stuff in this file is taken from Christos' SVR4 emul
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* code. The things that need to be done are largely the same, so
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* re-inventing the wheel doesn't make much sense.
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*/
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/*
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* Some boring signal conversion functions. Just a switch() for all signals;
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* return the converted signal number, 0 if not supported.
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*/
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int
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bsd_to_linux_sig(sig)
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int sig;
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{
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switch(sig) {
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case SIGHUP:
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return LINUX_SIGHUP;
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case SIGINT:
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return LINUX_SIGINT;
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case SIGQUIT:
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return LINUX_SIGQUIT;
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case SIGILL:
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return LINUX_SIGILL;
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case SIGTRAP:
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return LINUX_SIGTRAP;
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case SIGABRT:
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return LINUX_SIGABRT;
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case SIGFPE:
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return LINUX_SIGFPE;
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case SIGKILL:
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return LINUX_SIGKILL;
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case SIGBUS:
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return LINUX_SIGBUS;
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case SIGSEGV:
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return LINUX_SIGSEGV;
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case SIGPIPE:
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return LINUX_SIGPIPE;
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case SIGALRM:
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return LINUX_SIGALRM;
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case SIGTERM:
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return LINUX_SIGTERM;
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case SIGURG:
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return LINUX_SIGURG;
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case SIGSTOP:
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return LINUX_SIGSTOP;
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case SIGTSTP:
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return LINUX_SIGTSTP;
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case SIGCONT:
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return LINUX_SIGCONT;
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case SIGCHLD:
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return LINUX_SIGCHLD;
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case SIGTTIN:
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return LINUX_SIGTTIN;
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case SIGTTOU:
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return LINUX_SIGTTOU;
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case SIGIO:
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return LINUX_SIGIO;
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case SIGXCPU:
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return LINUX_SIGXCPU;
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case SIGXFSZ:
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return LINUX_SIGXFSZ;
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case SIGVTALRM:
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return LINUX_SIGVTALRM;
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case SIGPROF:
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return LINUX_SIGPROF;
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case SIGWINCH:
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return LINUX_SIGWINCH;
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case SIGUSR1:
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return LINUX_SIGUSR1;
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case SIGUSR2:
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return LINUX_SIGUSR2;
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/* Not supported: EMT, SYS, INFO */
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}
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return 0;
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}
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int
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linux_to_bsd_sig(sig)
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int sig;
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{
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switch(sig) {
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case LINUX_SIGHUP:
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return SIGHUP;
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case LINUX_SIGINT:
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return SIGINT;
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case LINUX_SIGQUIT:
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return SIGQUIT;
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case LINUX_SIGILL:
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return SIGILL;
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case LINUX_SIGTRAP:
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return SIGTRAP;
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case LINUX_SIGABRT:
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return SIGABRT;
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case LINUX_SIGBUS:
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return SIGBUS;
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case LINUX_SIGFPE:
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return SIGFPE;
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case LINUX_SIGKILL:
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return SIGKILL;
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case LINUX_SIGUSR1:
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return SIGUSR1;
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case LINUX_SIGSEGV:
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return SIGSEGV;
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case LINUX_SIGUSR2:
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return SIGUSR2;
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case LINUX_SIGPIPE:
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return SIGPIPE;
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case LINUX_SIGALRM:
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return SIGALRM;
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case LINUX_SIGTERM:
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return SIGTERM;
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case LINUX_SIGCHLD:
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return SIGCHLD;
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case LINUX_SIGCONT:
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return SIGCONT;
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case LINUX_SIGSTOP:
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return SIGSTOP;
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case LINUX_SIGTSTP:
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return SIGTSTP;
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case LINUX_SIGTTIN:
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return SIGTTIN;
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case LINUX_SIGTTOU:
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return SIGTTOU;
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case LINUX_SIGURG:
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return SIGURG;
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case LINUX_SIGXCPU:
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return SIGXCPU;
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case LINUX_SIGXFSZ:
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return SIGXFSZ;
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case LINUX_SIGVTALRM:
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return SIGVTALRM;
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case LINUX_SIGPROF:
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return SIGPROF;
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case LINUX_SIGWINCH:
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return SIGWINCH;
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case LINUX_SIGIO:
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return SIGIO;
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/* Not supported: STKFLT, PWR */
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}
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return 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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static 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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*bss = (sigset_t) 0;
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for (i = 1; i <= LINUX_NSIG; i++) {
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if (*lss & sigmask(i)) {
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newsig = linux_to_bsd_sig(i);
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if (newsig)
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*bss |= sigmask(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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*lss = (linux_sigset_t) 0;
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for (i = 1; i <= NSIG; i++) {
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if (*bss & sigmask(i)) {
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newsig = bsd_to_linux_sig(i);
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if (newsig)
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*lss |= sigmask(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. The Linux
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* SA_ONESHOT and SA_NOMASK flags (which together form the old
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* SysV signal behavior) are silently ignored. XXX
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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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bsa->sa_flags |= cvtto_bsd_mask(lsa->sa_flags, LINUX_SA_NOCLDSTOP,
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SA_NOCLDSTOP);
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bsa->sa_flags |= cvtto_bsd_mask(lsa->sa_flags, LINUX_SA_ONSTACK,
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SA_ONSTACK);
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bsa->sa_flags |= cvtto_bsd_mask(lsa->sa_flags, LINUX_SA_RESTART,
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SA_RESTART);
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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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lsa->sa_flags |= cvtto_linux_mask(bsa->sa_flags, SA_NOCLDSTOP,
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LINUX_SA_NOCLDSTOP);
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lsa->sa_flags |= cvtto_linux_mask(bsa->sa_flags, SA_ONSTACK,
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LINUX_SA_ONSTACK);
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lsa->sa_flags |= cvtto_linux_mask(bsa->sa_flags, SA_RESTART,
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LINUX_SA_RESTART);
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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_sigaction(p, uap, retval)
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register struct proc *p;
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struct linux_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;
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register_t *retval;
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{
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struct sigaction *nbsda = NULL, *obsda = NULL, tmpbsda;
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struct linux_sigaction *nlsa, *olsa, tmplsa;
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struct 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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olsa = SCARG(uap, osa);
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nlsa = SCARG(uap, nsa);
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if (olsa != NULL)
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obsda = stackgap_alloc(&sg, sizeof (struct sigaction));
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if (nlsa != NULL) {
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nbsda = stackgap_alloc(&sg, sizeof (struct sigaction));
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if ((error = copyin(nlsa, &tmplsa, sizeof tmplsa)))
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return error;
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linux_to_bsd_sigaction(&tmplsa, &tmpbsda);
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if ((error = copyout(&tmpbsda, nbsda, sizeof tmpbsda)))
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return error;
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}
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SCARG(&sa, signum) = linux_to_bsd_sig(SCARG(uap, signum));
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SCARG(&sa, nsa) = nbsda;
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SCARG(&sa, osa) = obsda;
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if ((error = sigaction(p, &sa, retval)))
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return error;
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if (olsa != NULL) {
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if ((error = copyin(obsda, &tmpbsda, sizeof tmpbsda)))
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return error;
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bsd_to_linux_sigaction(&tmpbsda, &tmplsa);
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if ((error = copyout(&tmplsa, olsa, sizeof tmplsa)))
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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_signal(p, uap, retval)
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register struct proc *p;
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struct linux_signal_args /* {
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syscallarg(int) sig;
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syscallarg(linux_handler_t) handler;
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} */ *uap;
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register_t *retval;
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{
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caddr_t sg;
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struct 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 = 0;
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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 = 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_sigprocmask(p, uap, retval)
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register struct proc *p;
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register struct linux_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;
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register_t *retval;
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{
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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_siggetmask(p, uap, retval)
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struct proc *p;
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void *uap;
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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_sigsetmask(p, uap, retval)
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struct proc *p;
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struct linux_sigsetmask_args /* {
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syscallarg(linux_sigset_t) mask;
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} */ *uap;
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register_t *retval;
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{
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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_sigpending(p, uap, retval)
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struct proc *p;
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struct linux_sigpending_args /* {
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syscallarg(linux_sigset_t *) mask;
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} */ *uap;
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register_t *retval;
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{
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sigset_t bsdsig;
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linux_sigset_t linuxsig;
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bsdsig = p->p_siglist & p->p_sigmask;
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bsd_to_linux_sigset(&bsdsig, &linuxsig);
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return copyout(&linuxsig, SCARG(uap, mask), sizeof linuxsig);
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}
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int
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linux_sigsuspend(p, uap, retval)
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struct proc *p;
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struct linux_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;
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register_t *retval;
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{
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struct sigsuspend_args ssa;
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linux_to_bsd_sigset(&SCARG(uap, mask), &SCARG(&ssa, mask));
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return sigsuspend(p, &ssa, 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_pause(p, uap, retval)
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struct proc *p;
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void *uap;
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register_t *retval;
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{
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struct sigsuspend_args bsa;
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SCARG(&bsa, mask) = p->p_sigmask;
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return 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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*/
|
|
int
|
|
linux_kill(p, uap, retval)
|
|
struct proc *p;
|
|
struct linux_kill_args /* {
|
|
syscallarg(int) pid;
|
|
syscallarg(int) signum;
|
|
} */ *uap;
|
|
register_t *retval;
|
|
{
|
|
SCARG(uap, signum) = linux_to_bsd_sig(SCARG(uap, signum));
|
|
return kill(p, (struct kill_args *) uap, retval);
|
|
}
|