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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2012-2014 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 <stdlib.h>
  18 #include <signal.h>
  19 #include <unistd.h>
  20
  21 void
  22 do_nothing (void)
  23 {
  24 }
  25
  26 void
  27 handle (int sig)
  28 {
  29   do_nothing (); /* handle marker */
  30 }
  31
  32 int
  33 main ()
  34 {
  35   int i;
  36   signal (SIGHUP, handle);
  37
  38   raise (SIGHUP);               /* first HUP */
  39
  40   signal (SIGCHLD, handle);
  41   for (i = 0; i < 3; i++)       /* fork loop */
  42     {
  43       switch (fork())
  44         {
  45         case -1:
  46           perror ("fork");
  47           exit (1);
  48         case 0:
  49           exit (0);
  50         }
  51       wait (NULL);
  52     }
  53
  54   raise (SIGHUP);               /* second HUP */
  55
  56   raise (SIGHUP);               /* third HUP */
  57 }
  58