kernel - Major signal path adjustments to fix races, tsleep race fixes, +more
[dragonfly.git] / sys / emulation / 43bsd / 43bsd_signal.c
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1/*
2 * 43BSD_SIGNAL.C - 4.3BSD compatibility signal syscalls
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
f9366a82 40 * $DragonFly: src/sys/emulation/43bsd/43bsd_signal.c,v 1.5 2007/03/12 21:07:42 corecode Exp $
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41 * from: DragonFly kern/kern_sig.c,v 1.22
42 *
43 * These syscalls used to live in kern/kern_sig.c. They are modified
44 * to use the new split syscalls.
45 */
46
47#include "opt_compat.h"
48
49#include <sys/param.h>
50#include <sys/systm.h>
51#include <sys/sysproto.h>
52#include <sys/conf.h>
53#include <sys/kernel.h>
54#include <sys/kern_syscall.h>
55#include <sys/proc.h>
56#include <sys/signal.h>
57#include <sys/signalvar.h>
684a93c4 58
9ec81f83 59#include <sys/thread2.h>
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60
61#define ONSIG 32 /* NSIG for osig* syscalls. XXX. */
62
63#define SIG2OSIG(sig, osig) osig = (sig).__bits[0]
64#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig
65
66#define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0])
67
68/*
69 * These syscalls are unncessary because it is next to impossible to
70 * find 4.3BSD binaries built for i386. The current libc has routines
71 * which fake the 4.3BSD family of signal syscalls, so anything built
72 * from source won't be using these.
73 *
74 * This file is provided for educational purposes only. The osigvec()
75 * syscall is probably broken because the current signal code uses
76 * a different signal trampoline.
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77 *
78 * MPALMOSTSAFE
65957d54 79 */
65957d54 80int
753fd850 81sys_osigvec(struct osigvec_args *uap)
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82{
83 struct sigvec vec;
84 struct sigaction nsa, osa;
85 struct sigaction *nsap, *osap;
86 int error;
87
88 if (uap->signum <= 0 || uap->signum >= ONSIG)
89 return (EINVAL);
90 nsap = (uap->nsv != NULL) ? &nsa : NULL;
91 osap = (uap->osv != NULL) ? &osa : NULL;
92 if (nsap) {
93 error = copyin(uap->nsv, &vec, sizeof(vec));
94 if (error)
95 return (error);
96 nsap->sa_handler = vec.sv_handler;
97 OSIG2SIG(vec.sv_mask, nsap->sa_mask);
98 nsap->sa_flags = vec.sv_flags;
99 nsap->sa_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */
100 }
101
102 error = kern_sigaction(uap->signum, nsap, osap);
103
104 if (osap && !error) {
105 vec.sv_handler = osap->sa_handler;
106 SIG2OSIG(osap->sa_mask, vec.sv_mask);
107 vec.sv_flags = osap->sa_flags;
108 vec.sv_flags &= ~SA_NOCLDWAIT;
109 vec.sv_flags ^= SA_RESTART;
110 error = copyout(&vec, uap->osv, sizeof(vec));
111 }
112 return (error);
113}
114
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115/*
116 * MPSAFE
117 */
65957d54 118int
753fd850 119sys_osigblock(struct osigblock_args *uap)
65957d54 120{
08f2f1bb 121 struct lwp *lp = curthread->td_lwp;
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122 sigset_t set;
123
124 OSIG2SIG(uap->mask, set);
125 SIG_CANTMASK(set);
9ec81f83 126 crit_enter();
e54488bb 127 SIG2OSIG(lp->lwp_sigmask, uap->sysmsg_iresult);
08f2f1bb 128 SIGSETOR(lp->lwp_sigmask, set);
9ec81f83 129 crit_exit();
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130 return (0);
131}
132
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133/*
134 * MPSAFE
135 */
65957d54 136int
753fd850 137sys_osigsetmask(struct osigsetmask_args *uap)
65957d54 138{
08f2f1bb 139 struct lwp *lp = curthread->td_lwp;
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140 sigset_t set;
141
142 OSIG2SIG(uap->mask, set);
143 SIG_CANTMASK(set);
9ec81f83 144 crit_enter();
e54488bb 145 SIG2OSIG(lp->lwp_sigmask, uap->sysmsg_iresult);
08f2f1bb 146 SIGSETLO(lp->lwp_sigmask, set);
9ec81f83 147 crit_exit();
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148 return (0);
149}
150
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151/*
152 * MPSAFE
153 */
65957d54 154int
753fd850 155sys_osigstack(struct osigstack_args *uap)
65957d54 156{
08f2f1bb 157 struct lwp *lp = curthread->td_lwp;
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158 struct sigstack ss;
159 int error = 0;
160
08f2f1bb
SS
161 ss.ss_sp = lp->lwp_sigstk.ss_sp;
162 ss.ss_onstack = lp->lwp_sigstk.ss_flags & SS_ONSTACK;
65957d54 163 if (uap->oss && (error = copyout(&ss, uap->oss,
3919ced0 164 sizeof(struct sigstack)))) {
65957d54 165 return (error);
3919ced0 166 }
65957d54 167 if (uap->nss && (error = copyin(uap->nss, &ss, sizeof(ss))) == 0) {
08f2f1bb
SS
168 lp->lwp_sigstk.ss_sp = ss.ss_sp;
169 lp->lwp_sigstk.ss_size = 0;
170 lp->lwp_sigstk.ss_flags |= ss.ss_onstack & SS_ONSTACK;
4643740a 171 lp->lwp_flags |= LWP_ALTSTACK;
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172 }
173 return (error);
174}
175
176int
753fd850 177sys_okillpg(struct okillpg_args *uap)
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178{
179 int error;
180
f9366a82 181 error = kern_kill(uap->signum, -uap->pgid, -1);
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182
183 return (error);
184}