NetBSD/sys/compat/darwin/darwin_signal.c

/*	$NetBSD: darwin_signal.c,v 1.11 2003/12/04 22:00:03 manu Exp $ */

/*-
 * Copyright (c) 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Emmanuel Dreyfus.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: darwin_signal.c,v 1.11 2003/12/04 22:00:03 manu Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/sa.h>
#include <sys/syscallargs.h>

#include <compat/common/compat_util.h>

#include <compat/mach/mach_types.h>
#include <compat/mach/mach_vm.h>
#include <compat/mach/mach_port.h>
#include <compat/mach/mach_notify.h>

#include <compat/darwin/darwin_exec.h>
#include <compat/darwin/darwin_signal.h>
#include <compat/darwin/darwin_syscallargs.h>

int
darwin_sys_sigaction(l, v, retval)
	struct lwp *l;
	void *v;
	register_t *retval;
{
	struct darwin_sys_sigaction_args /* {
		syscallarg(int) signum;
		syscallarg(struct darwin___sigaction *) nsa;
		syscallarg(struct sigaction13 *) osa;
	} */ *uap = v;
	struct sys___sigaction_sigtramp_args cup;
	struct darwin___sigaction dsa;
	struct sigaction sa;
	struct sigaction *nsa, *osa;
	struct sigaction13 sa13;
	struct proc *p = l->l_proc;
	caddr_t sg = stackgap_init(p, 0);
	int error;

	if ((error = copyin(SCARG(uap, nsa), &dsa, sizeof(dsa))) != 0)
		return error;

	nsa = stackgap_alloc(p, &sg, sizeof(struct sigaction));
	if (SCARG(uap, osa) != NULL)
		osa = stackgap_alloc(p, &sg, sizeof(struct sigaction));
	else
		osa = NULL;

	sa.sa_handler = dsa.darwin_sa_handler.__sa_handler;
	native_sigset13_to_sigset(&dsa.darwin_sa_mask, &sa.sa_mask);
	if (dsa.darwin_sa_flags & ~DARWIN_SA_ALLBITS)
		DPRINTF(("darwin_sys_sigaction: ignoring bits (flags = %x)\n",
		    dsa.darwin_sa_flags));
	sa.sa_flags = dsa.darwin_sa_flags & DARWIN_SA_ALLBITS;

	if ((error = copyout(&sa, nsa, sizeof(sa))) != 0)
		return error;

	SCARG(&cup, signum) = SCARG(uap, signum);
	SCARG(&cup, nsa) = nsa;
	if (SCARG(uap, osa) != NULL)
		SCARG(&cup, osa) = osa;
	SCARG(&cup, tramp) = dsa.darwin_sa_tramp;
	SCARG(&cup, vers) = 1;

	if ((error = sys___sigaction_sigtramp(l, &cup, retval)) !=0)
		return error;

	if (SCARG(uap, osa) == NULL)
		return 0;

	if ((error = copyin(SCARG(&cup, osa), &sa, sizeof(sa))) != 0)
		return error;

	sa13.osa_handler = sa.sa_handler;
	sa13.osa_mask = sa.sa_mask.__bits[0];
	native_sigset_to_sigset13(&sa.sa_mask, &sa13.osa_mask);
	sa13.osa_flags = sa.sa_flags;

	if ((error = copyout(&sa13, SCARG(uap, osa), sizeof(sa13))) != 0)
		return error;

	return 0;
}

void
darwin_trapsignal(l, ksi)
	struct lwp *l;
	const struct ksiginfo *ksi;
{
	if (darwin_sigfilter(l, ksi) == 0)
		return;

	if (mach_trapsignal1(l, ksi) != 0)
		trapsignal(l, ksi);

	return;
}

int
darwin_sigfilter(l, ksi)
	struct lwp *l;
	const struct ksiginfo *ksi;
{
	struct proc *p = l->l_proc;
	struct darwin_emuldata *ded;
	int code[2];
	int error;
	int signo;

	signo = ksi->ksi_signo;

	/* 
	 * Don't generate Mach exeption for non 
	 * maskable, stop and continue signals 
	 */
	if (sigprop[signo] & (SA_CANTMASK | SA_STOP | SA_CONT | SA_TTYSTOP))
		return EINVAL;

	/* Don't send an exception if the signal is masked or ignored */
	if ((p->p_flag & P_TRACED) == 0) {
		if ((sigismember(&p->p_sigctx.ps_sigignore, signo)) ||
		    (sigismember(&p->p_sigctx.ps_sigmask, signo)))
			return EINVAL;
	}

	/* 
	 * Send signals as software exception if the process requested that.
	 */
	ded = (struct darwin_emuldata *)p->p_emuldata;
	if (ded->ded_flags & DARWIN_DED_SIGEXC) {
		code[0] = MACH_SOFT_SIGNAL;
		code[1] = signo;
		error = mach_exception(l, MACH_EXC_SOFTWARE, code);

		/* Like if the signal was sent, wakeup any waiting process */
		if ((error == 0) &&
		    p->p_sigctx.ps_sigwaited &&
		    sigismember(p->p_sigctx.ps_sigwait, signo) &&
		    (p->p_stat != SSTOP))
			wakeup_one(&p->p_sigctx.ps_sigwait);

		return error;
	}

	return EINVAL;
}