gdb/testsuite/gdb.base/interrupt-daemon-attach.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2017-2019 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 }