file_t
__file_name_lookup_at (int fd, int at_flags,
const char *file_name, int flags, mode_t mode)
{
error_t err;
file_t result;
int empty = at_flags & AT_EMPTY_PATH;
at_flags &= ~AT_EMPTY_PATH;
err = __hurd_at_flags (&at_flags, &flags);
if (err)
return (__hurd_fail (err), MACH_PORT_NULL);
if (fd == AT_FDCWD || file_name[0] == '/')
return __file_name_lookup (file_name, flags, mode);
if (empty != 0 && file_name[0] == '\0')
{
enum retry_type doretry;
char retryname[1024]; /* XXX string_t LOSES! */
err = HURD_DPORT_USE (fd, __dir_lookup (port, "", flags, mode,
&doretry, retryname,
&result));
if (! err)
err = __hurd_file_name_lookup_retry (&_hurd_ports_use, &__getdport,
NULL, doretry, retryname,
flags, mode, &result);
return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
}
file_t startdir;
error_t use_init_port (int which, error_t (*operate) (mach_port_t))
{
return (which == INIT_PORT_CWDIR ? (*operate) (startdir) :
_hurd_ports_use (which, operate));
}
err = HURD_DPORT_USE (fd, (startdir = port,
__hurd_file_name_lookup (&use_init_port,
&__getdport, NULL,
file_name,
flags,
mode & ~_hurd_umask,
&result)));
return err ? (__hurd_dfail (fd, err), MACH_PORT_NULL) : result;
}
error_t
__hurd_invoke_translator (file_t file, int flags, file_t *newport)
{
error_t err;
enum retry_type doretry;
char retryname[1024]; /* XXX string_t LOSES! */
err = __file_invoke_translator (file, flags, &doretry, retryname, newport);
if (! err)
err = __USEPORT (CRDIR, __hurd_file_name_lookup_retry (port,
doretry, retryname,
flags, 0, newport));
return err;
}
error_t
__hurd_file_name_lookup (error_t (*use_init_port)
(int which, error_t (*operate) (file_t)),
file_t (*get_dtable_port) (int fd),
error_t (*lookup)
(file_t dir, char *name, int flags, mode_t mode,
retry_type *do_retry, string_t retry_name,
mach_port_t *result),
const char *file_name, int flags, mode_t mode,
file_t *result)
{
error_t err;
enum retry_type doretry;
char retryname[1024]; /* XXX string_t LOSES! */
int startport;
error_t lookup_op (mach_port_t startdir)
{
return lookup_error ((*lookup) (startdir, file_name, flags, mode,
&doretry, retryname, result));
}
if (! lookup)
lookup = __dir_lookup;
if (file_name[0] == '\0')
return ENOENT;
startport = (file_name[0] == '/') ? INIT_PORT_CRDIR : INIT_PORT_CWDIR;
while (file_name[0] == '/')
file_name++;
if (flags & O_NOFOLLOW) /* See lookup-retry.c about O_NOFOLLOW. */
flags |= O_NOTRANS;
if (flags & O_DIRECTORY)
{
/* The caller wants to require that the file we look up is a directory.
We can do this without an extra RPC by appending a trailing slash
to the file name we look up. */
size_t len = strlen (file_name);
if (len == 0)
file_name = "/";
else if (file_name[len - 1] != '/')
{
char *n = alloca (len + 2);
memcpy (n, file_name, len);
n[len] = '/';
n[len + 1] = '\0';
file_name = n;
}
}
err = (*use_init_port) (startport, &lookup_op);
if (! err)
err = __hurd_file_name_lookup_retry (use_init_port, get_dtable_port,
lookup, doretry, retryname,
flags, mode, result);
return err;
}
