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 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 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 * 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 90 mdb_signal_raise(int sig) 91 { 92 return (kill(getpid(), sig)); 93 } 94 95 int 96 mdb_signal_pgrp(int sig) 97 { 98 return (kill(0, sig)); 99 } 100 101 int 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 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 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 133 mdb_signal_unblockall(void) 134 { 135 sigset_t set; 136 137 (void) sigfillset(&set); 138 return (sigprocmask(SIG_UNBLOCK, &set, NULL)); 139 } 140