1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <signal.h>
30 #include <unistd.h>
31 #include <errno.h>
32
33 #include <mdb/mdb_signal.h>
34 #include <mdb/mdb_debug.h>
35
36 static mdb_signal_f *sig_handlers[NSIG];
37 static void *sig_data[NSIG];
38
39 static void
sig_stub(int sig,siginfo_t * sip,void * ucp)40 sig_stub(int sig, siginfo_t *sip, void *ucp)
41 {
42 sig_handlers[sig](sig, sip, (ucontext_t *)ucp, sig_data[sig]);
43 }
44
45 int
mdb_signal_sethandler(int sig,mdb_signal_f * handler,void * data)46 mdb_signal_sethandler(int sig, mdb_signal_f *handler, void *data)
47 {
48 struct sigaction act;
49 int status;
50
51 ASSERT(sig > 0 && sig < NSIG && sig != SIGKILL && sig != SIGSTOP);
52
53 sig_handlers[sig] = handler;
54 sig_data[sig] = data;
55
56 if (handler == SIG_DFL || handler == SIG_IGN) {
57 act.sa_handler = handler;
58 act.sa_flags = SA_RESTART;
59 } else {
60 act.sa_handler = sig_stub;
61 act.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
62 }
63
64 (void) sigemptyset(&act.sa_mask);
65
66 if (sig == SIGWINCH || sig == SIGTSTP) {
67 (void) sigaddset(&act.sa_mask, SIGWINCH);
68 (void) sigaddset(&act.sa_mask, SIGTSTP);
69 (void) sigaddset(&act.sa_mask, SIGHUP);
70 (void) sigaddset(&act.sa_mask, SIGTERM);
71 }
72
73 if ((status = sigaction(sig, &act, NULL)) == 0)
74 (void) mdb_signal_unblock(sig);
75
76 return (status);
77 }
78
79 mdb_signal_f *
mdb_signal_gethandler(int sig,void ** datap)80 mdb_signal_gethandler(int sig, void **datap)
81 {
82 if (datap != NULL)
83 *datap = sig_data[sig];
84
85 return (sig_handlers[sig]);
86 }
87
88 int
mdb_signal_raise(int sig)89 mdb_signal_raise(int sig)
90 {
91 return (kill(getpid(), sig));
92 }
93
94 int
mdb_signal_pgrp(int sig)95 mdb_signal_pgrp(int sig)
96 {
97 return (kill(0, sig));
98 }
99
100 int
mdb_signal_block(int sig)101 mdb_signal_block(int sig)
102 {
103 sigset_t set;
104
105 (void) sigemptyset(&set);
106 (void) sigaddset(&set, sig);
107
108 return (sigprocmask(SIG_BLOCK, &set, NULL));
109 }
110
111 int
mdb_signal_unblock(int sig)112 mdb_signal_unblock(int sig)
113 {
114 sigset_t set;
115
116 (void) sigemptyset(&set);
117 (void) sigaddset(&set, sig);
118
119 return (sigprocmask(SIG_UNBLOCK, &set, NULL));
120 }
121
122 int
mdb_signal_blockall(void)123 mdb_signal_blockall(void)
124 {
125 sigset_t set;
126
127 (void) sigfillset(&set);
128 return (sigprocmask(SIG_BLOCK, &set, NULL));
129 }
130
131 int
mdb_signal_unblockall(void)132 mdb_signal_unblockall(void)
133 {
134 sigset_t set;
135
136 (void) sigfillset(&set);
137 return (sigprocmask(SIG_UNBLOCK, &set, NULL));
138 }
139