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 #include <signal.h>
28 #include <unistd.h>
29 #include <errno.h>
30
31 #include <mdb/mdb_signal.h>
32 #include <mdb/mdb_debug.h>
33
34 static mdb_signal_f *sig_handlers[NSIG];
35 static void *sig_data[NSIG];
36
37 static void
sig_stub(int sig,siginfo_t * sip,void * ucp)38 sig_stub(int sig, siginfo_t *sip, void *ucp)
39 {
40 sig_handlers[sig](sig, sip, (ucontext_t *)ucp, sig_data[sig]);
41 }
42
43 int
mdb_signal_sethandler(int sig,mdb_signal_f * handler,void * data)44 mdb_signal_sethandler(int sig, mdb_signal_f *handler, void *data)
45 {
46 struct sigaction act;
47 int status;
48
49 ASSERT(sig > 0 && sig < NSIG && sig != SIGKILL && sig != SIGSTOP);
50
51 sig_handlers[sig] = handler;
52 sig_data[sig] = data;
53
54 if (handler == MDB_SIG_DFL) {
55 act.sa_handler = SIG_DFL;
56 act.sa_flags = SA_RESTART;
57 } else if (handler == MDB_SIG_IGN) {
58 act.sa_handler = SIG_IGN;
59 act.sa_flags = SA_RESTART;
60 } else {
61 act.sa_sigaction = sig_stub;
62 act.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK;
63 }
64
65 (void) sigemptyset(&act.sa_mask);
66
67 if (sig == SIGWINCH || sig == SIGTSTP) {
68 (void) sigaddset(&act.sa_mask, SIGWINCH);
69 (void) sigaddset(&act.sa_mask, SIGTSTP);
70 (void) sigaddset(&act.sa_mask, SIGHUP);
71 (void) sigaddset(&act.sa_mask, SIGTERM);
72 }
73
74 if ((status = sigaction(sig, &act, NULL)) == 0)
75 (void) mdb_signal_unblock(sig);
76
77 return (status);
78 }
79
80 mdb_signal_f *
mdb_signal_gethandler(int sig,void ** datap)81 mdb_signal_gethandler(int sig, void **datap)
82 {
83 if (datap != NULL)
84 *datap = sig_data[sig];
85
86 return (sig_handlers[sig]);
87 }
88
89 int
mdb_signal_raise(int sig)90 mdb_signal_raise(int sig)
91 {
92 return (kill(getpid(), sig));
93 }
94
95 int
mdb_signal_pgrp(int sig)96 mdb_signal_pgrp(int sig)
97 {
98 return (kill(0, sig));
99 }
100
101 int
mdb_signal_block(int sig)102 mdb_signal_block(int sig)
103 {
104 sigset_t set;
105
106 (void) sigemptyset(&set);
107 (void) sigaddset(&set, sig);
108
109 return (sigprocmask(SIG_BLOCK, &set, NULL));
110 }
111
112 int
mdb_signal_unblock(int sig)113 mdb_signal_unblock(int sig)
114 {
115 sigset_t set;
116
117 (void) sigemptyset(&set);
118 (void) sigaddset(&set, sig);
119
120 return (sigprocmask(SIG_UNBLOCK, &set, NULL));
121 }
122
123 int
mdb_signal_blockall(void)124 mdb_signal_blockall(void)
125 {
126 sigset_t set;
127
128 (void) sigfillset(&set);
129 return (sigprocmask(SIG_BLOCK, &set, NULL));
130 }
131
132 int
mdb_signal_unblockall(void)133 mdb_signal_unblockall(void)
134 {
135 sigset_t set;
136
137 (void) sigfillset(&set);
138 return (sigprocmask(SIG_UNBLOCK, &set, NULL));
139 }
140