Attachment 156975 Details for Bug 244162 – Updated to loop instead of abort()ing in the main code.

Updated to loop instead of abort()ing in the main code.

cont-sigstop-detach.c (text/plain), 3.25 KB, created by Jan Kratochvil on 2007-06-14 10:04:59 UTC

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Creator: Jan Kratochvil

Created: 2007-06-14 10:04:59 UTC

Size: 3.25 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>
>
>static void action(int sig, siginfo_t * info, void *uc)
>{
>  raise (SIGALRM);
>}
>
>static void loop (void)
>{
>  struct sigaction act;
>
>  memset (&act, 0, sizeof(struct sigaction));
>  act.sa_sigaction = action;
>  act.sa_flags = SA_RESTART;
>  sigaction (SIGALRM, &act, 0);
>
>  raise (SIGALRM);
>
>  for (;;)
>    pause ();
>  /* NOTREACHED */
>  abort ();
>}
>
>static pid_t child;
>
>static void
>cleanup (void)
>{
>  kill (child, SIGKILL);
>}
>
>static void
>handler (int signo)
>{
>  cleanup ();
>}
>
>static void
>print_status(int tid)
>{
>  int fd, n;
>  char buf[8192];
>  char fn[64];
>  snprintf(fn, sizeof fn, "/proc/%d/status", tid);
>  fd = open(fn, O_RDONLY);
>  n = read(fd, buf, sizeof buf);
>  close(fd);
>  write(1, buf, n);
>}
>
>
>int main (void)
>{
>  void (*handler_orig) (int signo);
>  unsigned long n;
>
>  setbuf (stdout, NULL);
>
>  child = fork ();
>  switch (child)
>    {
>      case -1:
>	abort ();
>      case 0:
>	loop ();
>	/* NOTREACHED */
>	abort ();
>      default:
>        break;
>    }
>
>  atexit (cleanup);
>  handler_orig = signal (SIGABRT, handler);
>  assert (handler_orig == SIG_DFL);
>
>  for (n=0;;++n)
>    {
>      errno = 0;
>      ptrace (PTRACE_ATTACH, child, NULL, NULL);
>      assert_perror (errno);
>      unsigned long sig;
>#if 0
>      printf ("attach %lu\n", n);
>#endif
>
>      /* Deliver one SIGSTOP just for sure.
>	 If the process was already stopped AND some other process (like shell)
>	 has already waited for it we would get stuck in waitpid ().  */
>      sig = SIGSTOP;
>      do
>	{
>	  pid_t got_pid;
>	  int status;
>
>	  errno = 0;
>	  ptrace (PT_CONTINUE, child, (void *) 1UL, (void *) sig);
>	  /* For unstopped processes the preventive signal may ESRCH.  */
>	  if (sig != SIGSTOP)
>	    {
>	      assert_perror (errno);
>	      putchar ('.');
>	    }
>
>	  got_pid = waitpid (child, &status, 0);
>	  assert (got_pid == child);
>
>	  /* Check if the thread has exited.  */
>	  assert (!WIFEXITED (status));
>	  assert (!WIFSIGNALED (status));
>
>	  assert (WIFSTOPPED (status));
>	  sig = WSTOPSIG (status);
>	  assert (sig != 0);
>	}
>      while (sig != SIGSTOP);
>
>      errno = 0;
>      ptrace (PTRACE_DETACH, child, (void *) 1UL, (void *) 0UL);
>      if (errno == ESRCH)
>        {
>	  fputs ("utrace bug hit\n", stderr);
>	  print_status(child);
>	  abort ();
>	}
>      assert_perror (errno);
>    }
>
>  return 0;
>}

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Attachments on bug 244162: 156968 | 156970 | 156975 | 157288 | 212881 | 212891 | 212901