1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2017-2020 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 <stdlib.h> 19 #include <unistd.h> 20 21 /* GDB reads this to figure out the child's PID. */ 22 pid_t child_pid; 23 24 void 25 marker (void) 26 { 27 } 28 29 int 30 main () 31 { 32 /* Don't let the test case run forever. */ 33 alarm (60); 34 35 child_pid = fork (); 36 37 switch (child_pid) 38 { 39 case -1: 40 return 1; 41 42 case 0: 43 break; 44 45 default: 46 /* In parent process. */ 47 while (1) 48 { 49 marker (); 50 usleep (1000); 51 } 52 } 53 54 /* In child process. */ 55 56 /* Alarms are not inherited by child processes. Set the alarm again to stop 57 the test case running forever. */ 58 alarm (60); 59 60 /* Detach from controlling terminal. */ 61 if (setsid () == (pid_t) -1) 62 return 1; 63 64 while (1) 65 usleep (1000); 66 67 return 0; 68 } 69