gdb/testsuite/gdb.base/catch-signal-fork.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2012-2019 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 #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