Attachment 186401 Details for Bug 276861 – Kernel testcase.

Kernel testcase.

trap.c (text/plain), 3.35 KB, created by Jan Kratochvil on 2007-09-04 18:14:10 UTC

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Creator: Jan Kratochvil

Created: 2007-09-04 18:14:10 UTC

Size: 3.35 KB

patch

obsolete

>/* This testcase is part of GDB, the GNU debugger.
>
>   Copyright 2007 Free Software Foundation, Inc.
>
>   This program is free software; you can redistribute it and/or modify
>   it under the terms of the GNU General Public License as published by
>   the Free Software Foundation; either version 2 of the License, or
>   (at your option) any later version.
>
>   This program is distributed in the hope that it will be useful,
>   but WITHOUT ANY WARRANTY; without even the implied warranty of
>   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>   GNU General Public License for more details.
>
>   You should have received a copy of the GNU General Public License
>   along with this program; if not, write to the Free Software
>   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
>
>#define _GNU_SOURCE
>#include <signal.h>
>#include <unistd.h>
>#include <string.h>
>#include <stdio.h>
>#include <stdlib.h>
>#include <errno.h>
>#include <sys/wait.h>
>#include <sys/ptrace.h>
>#include <assert.h>
>#include <fcntl.h>
>#include <error.h>
>
>/* Let it both enter and exit the syscall.  */
>#define PTRACES 2
>
>#if PTRACES % 2
>#error "Let it both enter and exit the syscall!"
>#endif
>
>#define LOOPS 200
>
>#define DELAY_USEC (1000000 / 10)
>
>static void loop (void)
>{
>  /* Loop with any immediately returning syscall.  */
>  for (;;)
>    alarm (0);
>  /* NOTREACHED */
>  abort ();
>}
>
>static pid_t child;
>
>static void
>cleanup (void)
>{
>  if (child)
>    {
>      pid_t pid_got;
>
>      /* Red Hat 2.6.9-57.ELsmp would sometimes lock on WAITPID otherwise.  */
>      ptrace (PTRACE_DETACH, child, NULL, NULL);
>      kill (child, SIGKILL);
>
>      pid_got = waitpid (child, NULL, 0);
>      assert (pid_got == child);
>
>      child = 0;
>    }
>}
>
>static void
>handler (int signo)
>{
>  cleanup ();
>}
>
>int main (void)
>{
>  pid_t pid_got;
>  int status;
>  int loops, ptraces;
>  int bad = 0;
>
>  void (*handler_orig) (int signo);
>
>  setbuf (stdout, NULL);
>  atexit (cleanup);
>  handler_orig = signal (SIGABRT, handler);
>  assert (handler_orig == SIG_DFL);
>
>  for (loops = 0; loops < LOOPS; loops++)
>    {
>      if (child == 0)
>        {
>	  child = fork ();
>	  switch (child)
>	    {
>	      case -1:
>		abort ();
>	      case 0:
>		loop ();
>		/* NOTREACHED */
>		abort ();
>	      default:
>		break;
>	    }
>        }
>
>      errno = 0;
>      ptrace (PTRACE_ATTACH, child, NULL, NULL);
>      assert_perror (errno);
>
>      pid_got = waitpid (child, &status, 0);
>      assert (pid_got == child);
>      assert (WIFSTOPPED (status));
>      if (WSTOPSIG (status) == SIGTRAP)
>	{
>	  error (0, 0, "%s after %d iterations",
>		 strsignal (WSTOPSIG (status)), loops);
>	  ++bad;
>	  cleanup ();
>	  continue;
>	}
>      assert (WSTOPSIG (status) == SIGSTOP);
>
>      for (ptraces = 0; ptraces < PTRACES; ptraces++)
>	{
>	  errno = 0;
>	  ptrace (PTRACE_SYSCALL, child, (void *) 1UL, (void *) 0UL);
>	  assert_perror (errno);
>
>	  pid_got = waitpid (child, &status, 0);
>	  assert (pid_got == child);
>	  assert (WIFSTOPPED (status));
>	  assert (WSTOPSIG (status) == SIGTRAP);
>	}
>
>      errno = 0;
>      ptrace (PTRACE_DETACH, child, (void *) 1UL, (void *) 0UL);
>      assert_perror (errno);
>
>      usleep (DELAY_USEC);
>    }
>
>  printf ("%d bad in %d iterations - may occur in 1 of 2 runs: %.2f%% * 2 = %.2f%%\n",
>          bad, LOOPS, 100.0 * bad / LOOPS, 2 * (100.0 * bad / LOOPS));
>  if (bad)
>    {
>      puts ("FAIL");
>      return 1;
>    }
>  puts ("PASS");
>  return 0;
>}

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Attachments on bug 276861: 186401 | 187211