Example #1
0
error_t
_hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes, loff_t offset)
{
  error_t err;
  char *data;
  mach_msg_type_number_t nread;

  error_t readfd (io_t port)
    {
      return __io_read (port, &data, &nread, offset, *nbytes);
    }

  data = buf;
  nread = *nbytes;
  if (err = HURD_FD_PORT_USE (fd, _hurd_ctty_input (port, ctty, readfd)))
    return err;

  if (data != buf)
    {
      if (nread > *nbytes)	/* Sanity check for bogus server.  */
	{
	  __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread);
	  return EGRATUITOUS;
	}
      memcpy (buf, data, nread);
      __vm_deallocate (__mach_task_self (), (vm_address_t) data, nread);
    }

  *nbytes = nread;
  return 0;
}
Example #2
0
/* Read the contents of the symbolic link FILE_NAME relative to FD into no more
   than LEN bytes of BUF.  The contents are not null-terminated.
   Returns the number of characters read, or -1 for errors.  */
ssize_t
readlinkat (int fd, const char *file_name, char *buf, size_t len)
{
  error_t err;
  file_t file;
  struct stat64 st;

  file = __file_name_lookup_at (fd, 0, file_name, O_READ | O_NOLINK, 0);
  if (file == MACH_PORT_NULL)
    return -1;

  err = __io_stat (file, &st);
  if (! err)
    if (S_ISLNK (st.st_mode))
      {
	char *rbuf = buf;

	err = __io_read (file, &rbuf, &len, 0, len);
	if (!err && rbuf != buf)
	  {
	    memcpy (buf, rbuf, len);
	    __vm_deallocate (__mach_task_self (), (vm_address_t)rbuf, len);
	  }
      }
    else
      err = EINVAL;

  __mach_port_deallocate (__mach_task_self (), file);

  return err ? __hurd_fail (err) : len;
}
Example #3
0
/* Read up to N chars into BUF from COOKIE.
   Return how many chars were read, 0 for EOF or -1 for error.  */
static ssize_t
readio (void *cookie, char *buf, size_t n)
{
  mach_msg_type_number_t nread;
  error_t err;
  char *bufp = buf;

  nread = n;
  if (err = __io_read ((io_t) cookie, &bufp, &nread, -1, n))
    return __hurd_fail (err);

  if (bufp != buf)
    {
      memcpy (buf, bufp, nread);
      __vm_deallocate (__mach_task_self (),
		       (vm_address_t) bufp, (vm_size_t) nread);
    }

  return nread;
}