nptl/tst-cleanup2.c

   1 /* Copyright (C) 2003-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Bao Duong <bduong@progress.com>, 2003.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <setjmp.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <sys/types.h>
  24
  25 static sigjmp_buf jmpbuf;
  26
  27 static void
  28 sig_handler (int signo)
  29 {
  30   siglongjmp (jmpbuf, 1);
  31 }
  32
  33 static int
  34 do_test (void)
  35 {
  36   char *p = NULL;
  37   /* gcc can overwrite the success written value by scheduling instructions
  38      around sprintf.  It is allowed to do this since according to C99 the first
  39      argument of sprintf is a character array and NULL is not a valid character
  40      array.  Mark the return value as volatile so that it gets reloaded on
  41      return.  */
  42   volatile int ret = 0;
  43   struct sigaction sa;
  44
  45   sa.sa_handler = sig_handler;
  46   sigemptyset (&sa.sa_mask);
  47   sa.sa_flags = SA_SIGINFO;
  48
  49   if (sigaction (SIGSEGV, &sa, 0))
  50     {
  51       perror ("installing SIGSEGV handler\n");
  52       exit (1);
  53     }
  54
  55   puts ("Attempting to sprintf to null ptr");
  56   if (setjmp (jmpbuf))
  57     {
  58       puts ("Exiting main...");
  59       return ret;
  60     }
  61
  62   sprintf (p, "This should segv\n");
  63
  64   return 1;
  65 }
  66
  67 #define TEST_FUNCTION do_test ()
  68 #include "../test-skeleton.c"