gdb/testsuite/gdb.threads/clone-new-thread-event.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2013 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    Test that GDB doesn't lose an event for a thread it didn't know
  19    about, until an event is reported for it.  */
  20
  21 #define _GNU_SOURCE
  22 #include <sched.h>
  23 #include <assert.h>
  24 #include <stdlib.h>
  25 #include <signal.h>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28 #include <sys/syscall.h>
  29
  30 #include <features.h>
  31 #ifdef __UCLIBC__
  32 #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
  33 #define HAS_NOMMU
  34 #endif
  35 #endif
  36
  37 #define STACK_SIZE 0x1000
  38
  39 static int
  40 tkill (int lwpid, int signo)
  41 {
  42   return syscall (__NR_tkill, lwpid, signo);
  43 }
  44
  45 static pid_t
  46 gettid (void)
  47 {
  48   return syscall (__NR_gettid);
  49 }
  50
  51 static int
  52 fn (void *unused)
  53 {
  54   tkill (gettid (), SIGUSR1);
  55   return 0;
  56 }
  57
  58 int
  59 main (int argc, char **argv)
  60 {
  61   unsigned char *stack;
  62   int new_pid;
  63
  64   stack = malloc (STACK_SIZE);
  65   assert (stack != NULL);
  66
  67   new_pid = clone (fn, stack + STACK_SIZE, CLONE_FILES
  68 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
  69                    | CLONE_VM
  70 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
  71                    , NULL, NULL, NULL, NULL);
  72   assert (new_pid > 0);
  73
  74   return 0;
  75 }