linux_sigaction.c revision 1.22 
1/*	$NetBSD: linux_sigaction.c,v 1.22 2002/02/15 16:48:03 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Frank van der Linden and Eric Haszlakiewicz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the NetBSD
21 *	Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39/*
40 * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
41 */
42
43#include <sys/cdefs.h>
44__KERNEL_RCSID(0, "$NetBSD: linux_sigaction.c,v 1.22 2002/02/15 16:48:03 christos Exp $");
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/proc.h>
49#include <sys/filedesc.h>
50#include <sys/mount.h>
51#include <sys/kernel.h>
52#include <sys/signal.h>
53#include <sys/signalvar.h>
54
55#include <sys/syscallargs.h>
56
57#include <compat/linux/common/linux_types.h>
58#include <compat/linux/common/linux_signal.h>
59#include <compat/linux/common/linux_util.h>
60
61#include <compat/linux/linux_syscallargs.h>
62
63/* Used on: alpha (aka osf_sigaction), arm, i386, m68k, mips, ppc */
64/* Not used on: sparc, sparc64 */
65
66/*
67 * The Linux sigaction() system call. Do the usual conversions,
68 * and just call sigaction().
69 */
70int
71linux_sys_sigaction(p, v, retval)
72	struct proc *p;
73	void *v;
74	register_t *retval;
75{
76	struct linux_sys_sigaction_args /* {
77		syscallarg(int) signum;
78		syscallarg(const struct linux_old_sigaction *) nsa;
79		syscallarg(struct linux_old_sigaction *) osa;
80	} */ *uap = v;
81	struct linux_old_sigaction nlsa, olsa;
82	struct sigaction nbsa, obsa;
83	int error, sig;
84
85	/* XXX XAX handle switch to RT signal handler */
86	/* XXX XAX and update emuldata->ps_siginfo. */
87
88	if (SCARG(uap, nsa)) {
89		error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
90		if (error)
91			return (error);
92		linux_old_to_native_sigaction(&nbsa, &nlsa);
93	}
94	sig = SCARG(uap, signum);
95	if (sig < 0 || sig >= LINUX__NSIG)
96		return (EINVAL);
97	if (sig > 0 && !linux_to_native_sig[sig]) {
98		/* Pretend that we did something useful for unknown signals. */
99		obsa.sa_handler = SIG_IGN;
100		sigemptyset(&obsa.sa_mask);
101		obsa.sa_flags = 0;
102	} else {
103		error = sigaction1(p, linux_to_native_sig[sig],
104		    SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0);
105		if (error)
106			return (error);
107	}
108	if (SCARG(uap, osa)) {
109		native_to_linux_old_sigaction(&olsa, &obsa);
110		error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
111		if (error)
112			return (error);
113	}
114	return (0);
115}
116