1 /* 2 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv (at) altlinux.org> 3 * Copyright (c) 2015-2017 The strace developers. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <assert.h> 30 #include <stdlib.h> 31 #include <unistd.h> 32 #include <signal.h> 33 34 static void handle_signal(int no) 35 { 36 _exit(128 + no); 37 } 38 39 int 40 main(void) 41 { 42 struct sigaction sa, sa0; 43 44 sa.sa_handler = SIG_IGN; 45 sigemptyset(&sa.sa_mask); 46 sigaddset(&sa.sa_mask, SIGHUP); 47 sigaddset(&sa.sa_mask, SIGINT); 48 sa.sa_flags = SA_RESTART; 49 assert(!sigaction(SIGUSR2, &sa, &sa0)); 50 51 sa.sa_handler = handle_signal; 52 sigemptyset(&sa.sa_mask); 53 sigaddset(&sa.sa_mask, SIGQUIT); 54 sigaddset(&sa.sa_mask, SIGTERM); 55 sa.sa_flags = SA_SIGINFO; 56 assert(!sigaction(SIGUSR2, &sa, &sa0)); 57 58 sa.sa_handler = SIG_DFL; 59 sigemptyset(&sa.sa_mask); 60 sa.sa_flags = 0; 61 assert(!sigaction(SIGUSR2, &sa, &sa0)); 62 63 sigfillset(&sa.sa_mask); 64 sigdelset(&sa.sa_mask, SIGHUP); 65 assert(!sigaction(SIGUSR2, &sa, &sa0)); 66 67 return 0; 68 } 69
