1 /* 2 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv (at) altlinux.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <assert.h> 29 #include <stdlib.h> 30 #include <unistd.h> 31 #include <signal.h> 32 33 static void handle_signal(int no) 34 { 35 _exit(128 + no); 36 } 37 38 int 39 main(void) 40 { 41 struct sigaction sa, sa0; 42 43 sa.sa_handler = SIG_IGN; 44 sigemptyset(&sa.sa_mask); 45 sigaddset(&sa.sa_mask, SIGHUP); 46 sigaddset(&sa.sa_mask, SIGINT); 47 sa.sa_flags = SA_RESTART; 48 assert(!sigaction(SIGUSR2, &sa, &sa0)); 49 50 sa.sa_handler = handle_signal; 51 sigemptyset(&sa.sa_mask); 52 sigaddset(&sa.sa_mask, SIGQUIT); 53 sigaddset(&sa.sa_mask, SIGTERM); 54 sa.sa_flags = SA_SIGINFO; 55 assert(!sigaction(SIGUSR2, &sa, &sa0)); 56 57 sa.sa_handler = SIG_DFL; 58 sigemptyset(&sa.sa_mask); 59 sa.sa_flags = 0; 60 assert(!sigaction(SIGUSR2, &sa, &sa0)); 61 62 sigfillset(&sa.sa_mask); 63 sigdelset(&sa.sa_mask, SIGHUP); 64 assert(!sigaction(SIGUSR2, &sa, &sa0)); 65 66 return 0; 67 } 68
