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;
}
error_t
_hurd_fd_write (struct hurd_fd *fd,
const void *buf, size_t *nbytes, loff_t offset)
{
error_t err;
mach_msg_type_number_t wrote;
error_t writefd (io_t port)
{
return __io_write (port, buf, *nbytes, offset, &wrote);
}
err = HURD_FD_PORT_USE (fd, _hurd_ctty_output (port, ctty, writefd));
if (! err)
*nbytes = wrote;
return err;
}
/* Read a directory entry from DIRP. */
struct dirent64 *
__readdir64 (DIR *dirp)
{
struct dirent64 *dp;
if (dirp == NULL)
{
errno = EINVAL;
return NULL;
}
__libc_lock_lock (dirp->__lock);
do
{
if (dirp->__ptr - dirp->__data >= dirp->__size)
{
/* We've emptied out our buffer. Refill it. */
char *data = dirp->__data;
int nentries;
error_t err;
if (err = HURD_FD_PORT_USE (dirp->__fd,
__dir_readdir (port,
&data, &dirp->__size,
dirp->__entry_ptr,
-1, 0, &nentries)))
{
__hurd_fail (err);
dp = NULL;
break;
}
/* DATA now corresponds to entry index DIRP->__entry_ptr. */
dirp->__entry_data = dirp->__entry_ptr;
if (data != dirp->__data)
{
/* The data was passed out of line, so our old buffer is no
longer useful. Deallocate the old buffer and reset our
information for the new buffer. */
__vm_deallocate (__mach_task_self (),
(vm_address_t) dirp->__data,
dirp->__allocation);
dirp->__data = data;
dirp->__allocation = round_page (dirp->__size);
}
/* Reset the pointer into the buffer. */
dirp->__ptr = dirp->__data;
if (nentries == 0)
{
/* End of file. */
dp = NULL;
break;
}
/* We trust the filesystem to return correct data and so we
ignore NENTRIES. */
}
dp = (struct dirent64 *) dirp->__ptr;
dirp->__ptr += dp->d_reclen;
++dirp->__entry_ptr;
/* Loop to ignore deleted files. */
} while (dp->d_fileno == 0);
__libc_lock_unlock (dirp->__lock);
return dp;
}
