Beispiel #1
0
/*
 * returns pid, or -1 for failure
 */
int
_openchild (const char *command, FILE ** fto, FILE ** ffrom)
{
  int i;
  int pid;
  int pdto[2];
  int pdfrom[2];

  if (__pipe (pdto) < 0)
    goto error1;
  if (__pipe (pdfrom) < 0)
    goto error2;
  switch (pid = __fork ())
    {
    case -1:
      goto error3;

    case 0:
      /*
       * child: read from pdto[0], write into pdfrom[1]
       */
      __close (0);
      __dup (pdto[0]);
      __close (1);
      __dup (pdfrom[1]);
      fflush (stderr);
      for (i = _rpc_dtablesize () - 1; i >= 3; i--)
	__close (i);
      fflush (stderr);
      execlp (command, command, NULL);
      perror ("exec");
      _exit (~0);

    default:
      /*
       * parent: write into pdto[1], read from pdfrom[0]
       */
      *fto = __fdopen (pdto[1], "w");
      __close (pdto[0]);
      *ffrom = __fdopen (pdfrom[0], "r");
      __close (pdfrom[1]);
      break;
    }
  return pid;

  /*
   * error cleanup and return
   */
error3:
  __close (pdfrom[0]);
  __close (pdfrom[1]);
error2:
  __close (pdto[0]);
  __close (pdto[1]);
error1:
  return -1;
}
Beispiel #2
0
/* Print a line on stderr consisting of the text in S, a colon, a space,
   a message describing the meaning of the contents of `errno' and a newline.
   If S is NULL or "", the colon and space are omitted.  */
void
perror (const char *s)
{
  int errnum = errno;
  FILE *fp;
  int fd = -1;


  /* The standard says that 'perror' must not change the orientation
     of the stream.  What is supposed to happen when the stream isn't
     oriented yet?  In this case we'll create a new stream which is
     using the same underlying file descriptor.  */
  if (__builtin_expect (_IO_fwide (stderr, 0) != 0, 1)
      || (fd = fileno (stderr)) == -1
      || (fd = __dup (fd)) == -1
      || (fp = fdopen (fd, "w+")) == NULL)
    {
      if (__builtin_expect (fd != -1, 0))
	__close (fd);

      /* Use standard error as is.  */
      perror_internal (stderr, s, errnum);
    }
  else
    {
      /* We don't have to do any special hacks regarding the file
	 position.  Since the stderr stream wasn't used so far we just
	 write to the descriptor.  */
      perror_internal (fp, s, errnum);
      /* Close the stream.  */
      fclose (fp);
    }
}
int dup(int oldfd) { 
    int newfd = 0;
    newfd = __dup(oldfd);
    if (fdleak_record_backtrace) {
        fdleak_record_backtrace(newfd);
    }
    return newfd;   
}
int dup(int oldfd) { 
    return __dup(oldfd);  
}
Beispiel #5
0
/* Function used in the clone call to setup the signals mask, posix_spawn
   attributes, and file actions.  It run on its own stack (provided by the
   posix_spawn call).  */
static int
__spawni_child (void *arguments)
{
  struct posix_spawn_args *args = arguments;
  const posix_spawnattr_t *restrict attr = args->attr;
  const posix_spawn_file_actions_t *file_actions = args->fa;
  int p = args->pipe[1];
  int ret;

  close_not_cancel (args->pipe[0]);

  /* The child must ensure that no signal handler are enabled because it shared
     memory with parent, so the signal disposition must be either SIG_DFL or
     SIG_IGN.  It does by iterating over all signals and although it could
     possibly be more optimized (by tracking which signal potentially have a
     signal handler), it might requires system specific solutions (since the
     sigset_t data type can be very different on different architectures).  */
  struct sigaction sa;
  memset (&sa, '\0', sizeof (sa));

  sigset_t hset;
  __sigprocmask (SIG_BLOCK, 0, &hset);
  for (int sig = 1; sig < _NSIG; ++sig)
    {
      if ((attr->__flags & POSIX_SPAWN_SETSIGDEF)
	  && sigismember (&attr->__sd, sig))
	{
	  sa.sa_handler = SIG_DFL;
	}
      else if (sigismember (&hset, sig))
	{
	  if (__nptl_is_internal_signal (sig))
	    sa.sa_handler = SIG_IGN;
	  else
	    {
	      __libc_sigaction (sig, 0, &sa);
	      if (sa.sa_handler == SIG_IGN)
		continue;
	      sa.sa_handler = SIG_DFL;
	    }
	}
      else
	continue;

      __libc_sigaction (sig, &sa, 0);
    }

#ifdef _POSIX_PRIORITY_SCHEDULING
  /* Set the scheduling algorithm and parameters.  */
  if ((attr->__flags & (POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER))
      == POSIX_SPAWN_SETSCHEDPARAM)
    {
      if ((ret = __sched_setparam (0, &attr->__sp)) == -1)
	goto fail;
    }
  else if ((attr->__flags & POSIX_SPAWN_SETSCHEDULER) != 0)
    {
      if ((ret = __sched_setscheduler (0, attr->__policy, &attr->__sp)) == -1)
	goto fail;
    }
#endif

  /* Set the process group ID.  */
  if ((attr->__flags & POSIX_SPAWN_SETPGROUP) != 0
      && (ret = __setpgid (0, attr->__pgrp)) != 0)
    goto fail;

  /* Set the effective user and group IDs.  */
  if ((attr->__flags & POSIX_SPAWN_RESETIDS) != 0
      && ((ret = local_seteuid (__getuid ())) != 0
	  || (ret = local_setegid (__getgid ())) != 0))
    goto fail;

  /* Execute the file actions.  */
  if (file_actions != 0)
    {
      int cnt;
      struct rlimit64 fdlimit;
      bool have_fdlimit = false;

      for (cnt = 0; cnt < file_actions->__used; ++cnt)
	{
	  struct __spawn_action *action = &file_actions->__actions[cnt];

	  /* Dup the pipe fd onto an unoccupied one to avoid any file
	     operation to clobber it.  */
	  if ((action->action.close_action.fd == p)
	      || (action->action.open_action.fd == p)
	      || (action->action.dup2_action.fd == p))
	    {
	      if ((ret = __dup (p)) < 0)
		goto fail;
	      p = ret;
	    }

	  switch (action->tag)
	    {
	    case spawn_do_close:
	      if ((ret =
		   close_not_cancel (action->action.close_action.fd)) != 0)
		{
		  if (!have_fdlimit)
		    {
		      __getrlimit64 (RLIMIT_NOFILE, &fdlimit);
		      have_fdlimit = true;
		    }

		  /* Signal errors only for file descriptors out of range.  */
		  if (action->action.close_action.fd < 0
		      || action->action.close_action.fd >= fdlimit.rlim_cur)
		    goto fail;
		}
	      break;

	    case spawn_do_open:
	      {
		ret = open_not_cancel (action->action.open_action.path,
				       action->action.
				       open_action.oflag | O_LARGEFILE,
				       action->action.open_action.mode);

		if (ret == -1)
		  goto fail;

		int new_fd = ret;

		/* Make sure the desired file descriptor is used.  */
		if (ret != action->action.open_action.fd)
		  {
		    if ((ret = __dup2 (new_fd, action->action.open_action.fd))
			!= action->action.open_action.fd)
		      goto fail;

		    if ((ret = close_not_cancel (new_fd)) != 0)
		      goto fail;
		  }
	      }
	      break;

	    case spawn_do_dup2:
	      if ((ret = __dup2 (action->action.dup2_action.fd,
				 action->action.dup2_action.newfd))
		  != action->action.dup2_action.newfd)
		goto fail;
	      break;
	    }
	}
    }

  /* Set the initial signal mask of the child if POSIX_SPAWN_SETSIGMASK
     is set, otherwise restore the previous one.  */
  __sigprocmask (SIG_SETMASK, (attr->__flags & POSIX_SPAWN_SETSIGMASK)
		 ? &attr->__ss : &args->oldmask, 0);

  args->exec (args->file, args->argv, args->envp);

  /* This is compatibility function required to enable posix_spawn run
     script without shebang definition for older posix_spawn versions
     (2.15).  */
  maybe_script_execute (args);

  ret = -errno;

fail:
  /* Since sizeof errno < PIPE_BUF, the write is atomic. */
  ret = -ret;
  if (ret)
    while (write_not_cancel (p, &ret, sizeof ret) < 0)
      continue;
  exit (SPAWN_ERROR);
}
Beispiel #6
0
int
dup(int oldfd)
{
	_gfs_hook_debug_v(fputs("Hooking dup\n", stderr));
	return (__dup(oldfd));
}