1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2012-2023 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 #include <stdio.h> 18 #include <stdlib.h> 19 #include <signal.h> 20 #include <sys/wait.h> 21 #include <unistd.h> 22 23 void 24 do_nothing (void) 25 { 26 } 27 28 void 29 handle (int sig) 30 { 31 do_nothing (); /* handle marker */ 32 } 33 34 int 35 main () 36 { 37 int i; 38 signal (SIGHUP, handle); 39 40 raise (SIGHUP); /* first HUP */ 41 42 signal (SIGCHLD, handle); 43 for (i = 0; i < 3; i++) /* fork loop */ 44 { 45 switch (fork()) 46 { 47 case -1: 48 perror ("fork"); 49 exit (1); 50 case 0: 51 exit (0); 52 } 53 wait (NULL); 54 } 55 56 raise (SIGHUP); /* second HUP */ 57 58 raise (SIGHUP); /* third HUP */ 59 } 60 61