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 == SIG_DFL || handler == SIG_IGN) { 55 act.sa_handler = handler; 56 act.sa_flags = SA_RESTART; 57 } else { 58 act.sa_handler = sig_stub; 59 act.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 60 } 61 62 (void) sigemptyset(&act.sa_mask); 63 64 if (sig == SIGWINCH || sig == SIGTSTP) { 65 (void) sigaddset(&act.sa_mask, SIGWINCH); 66 (void) sigaddset(&act.sa_mask, SIGTSTP); 67 (void) sigaddset(&act.sa_mask, SIGHUP); 68 (void) sigaddset(&act.sa_mask, SIGTERM); 69 } 70 71 if ((status = sigaction(sig, &act, NULL)) == 0) 72 (void) mdb_signal_unblock(sig); 73 74 return (status); 75 } 76 77 mdb_signal_f * 78 mdb_signal_gethandler(int sig, void **datap) 79 { 80 if (datap != NULL) 81 *datap = sig_data[sig]; 82 83 return (sig_handlers[sig]); 84 } 85 86 int 87 mdb_signal_raise(int sig) 88 { 89 return (kill(getpid(), sig)); 90 } 91 92 int 93 mdb_signal_pgrp(int sig) 94 { 95 return (kill(0, sig)); 96 } 97 98 int 99 mdb_signal_block(int sig) 100 { 101 sigset_t set; 102 103 (void) sigemptyset(&set); 104 (void) sigaddset(&set, sig); 105 106 return (sigprocmask(SIG_BLOCK, &set, NULL)); 107 } 108 109 int 110 mdb_signal_unblock(int sig) 111 { 112 sigset_t set; 113 114 (void) sigemptyset(&set); 115 (void) sigaddset(&set, sig); 116 117 return (sigprocmask(SIG_UNBLOCK, &set, NULL)); 118 } 119 120 int 121 mdb_signal_blockall(void) 122 { 123 sigset_t set; 124 125 (void) sigfillset(&set); 126 return (sigprocmask(SIG_BLOCK, &set, NULL)); 127 } 128 129 int 130 mdb_signal_unblockall(void) 131 { 132 sigset_t set; 133 134 (void) sigfillset(&set); 135 return (sigprocmask(SIG_UNBLOCK, &set, NULL)); 136 } 137