1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2015-2017 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 18 #include <unistd.h> 19 #include <stdio.h> 20 #include <sys/types.h> 21 #include <sys/wait.h> 22 23 int save_parent; 24 25 /* The fork child. Just runs forever. */ 26 27 static int 28 fork_child (void) 29 { 30 while (1) 31 { 32 sleep (1); 33 34 /* Exit if GDB kills the parent. */ 35 if (getppid () != save_parent) 36 break; 37 if (kill (getppid (), 0) != 0) 38 break; 39 } 40 41 return 0; 42 } 43 44 /* The fork parent. Just runs forever waiting for the child to 45 exit. */ 46 47 static int 48 fork_parent (void) 49 { 50 if (wait (NULL) == -1) 51 { 52 perror ("wait"); 53 return 1; 54 } 55 56 return 0; 57 } 58 59 int 60 main (void) 61 { 62 pid_t pid; 63 64 save_parent = getpid (); 65 66 /* Don't run forever. */ 67 alarm (180); 68 69 /* The parent and child should basically run forever without 70 tripping on any debug event. We want to check that GDB updates 71 the parent and child running states correctly right after the 72 fork. */ 73 pid = fork (); 74 if (pid > 0) 75 return fork_parent (); 76 else if (pid == 0) 77 return fork_child (); 78 else 79 { 80 perror ("fork"); 81 return 1; 82 } 83 } 84