glibc/hurd/hurdlookup.c

382 lines
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1995-02-18 02:27:10 +01:00
/* Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <hurd.h>
#include <string.h>
#include <limits.h>
#include <fcntl.h>
#include "stdio/_itoa.h"
#include <hurd/term.h>
/* Translate the error from dir_lookup into the error the user sees. */
static inline error_t
lookup_error (error_t error)
{
switch (error)
{
case EOPNOTSUPP:
case MIG_BAD_ID:
/* These indicate that the server does not understand dir_lookup
at all. If it were a directory, it would, by definition. */
return ENOTDIR;
default:
return error;
}
}
error_t
__hurd_file_name_lookup (file_t crdir, file_t cwdir,
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! */
file_t startdir;
startdir = file_name[0] == '/' ? crdir : cwdir;
while (file_name[0] == '/')
file_name++;
if (err = __dir_lookup (startdir, file_name, flags, mode,
&doretry, retryname, result))
return lookup_error (err);
return __hurd_file_name_lookup_retry (crdir, doretry, retryname, flags, mode,
result);
}
weak_alias (__hurd_file_name_lookup, hurd_file_name_lookup)
error_t
__hurd_file_name_lookup_retry (file_t crdir,
enum retry_type doretry,
char retryname[1024],
int flags, mode_t mode,
file_t *result)
{
error_t err;
file_t startdir;
file_t newpt;
char *file_name;
int dealloc_dir;
int nloops;
dealloc_dir = 0;
nloops = 0;
err = 0;
while (1)
{
if (dealloc_dir)
__mach_port_deallocate (__mach_task_self (), startdir);
if (err)
return lookup_error (err);
switch (doretry)
{
case FS_RETRY_REAUTH:
{
mach_port_t ref = __mach_reply_port ();
err = __io_reauthenticate (*result,
ref, MACH_MSG_TYPE_MAKE_SEND);
if (! err)
err = __USEPORT
(AUTH, __auth_user_authenticate (port, *result,
ref,
MACH_MSG_TYPE_MAKE_SEND,
&newpt));
__mach_port_destroy (__mach_task_self (), ref);
}
__mach_port_deallocate (__mach_task_self (), *result);
if (err)
return err;
*result = newpt;
/* Fall through. */
case FS_RETRY_NORMAL:
#ifdef SYMLOOP_MAX
if (nloops++ >= SYMLOOP_MAX)
return ELOOP;
#endif
/* An empty RETRYNAME indicates we have the final port. */
if (retryname[0] == '\0')
{
/* We got a successful translation. Now apply any open-time
action flags we were passed. */
if (flags & O_EXLOCK)
; /* XXX */
if (!err && (flags & O_SHLOCK))
; /* XXX */
if (!err && (flags & O_TRUNC))
err = __file_truncate (*result, 0);
if (err)
__mach_port_deallocate (__mach_task_self (), *result);
return err;
}
startdir = *result;
dealloc_dir = 1;
file_name = retryname;
break;
case FS_RETRY_MAGICAL:
switch (retryname[0])
{
case '/':
startdir = crdir;
dealloc_dir = 0;
if (*result != MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (), *result);
file_name = &retryname[1];
break;
case 'f':
if (retryname[1] == 'd' && retryname[2] == '/')
{
int fd;
char *end;
int save = errno;
errno = 0;
fd = (int) strtol (retryname, &end, 10);
if (end == NULL || errno || /* Malformed number. */
/* Check for excess text after the number. A slash
is valid; it ends the component. Anything else
does not name a numeric file descriptor. */
(*end != '/' && *end != '\0'))
{
errno = save;
return ENOENT;
}
*result = __getdport (fd);
if (*result == MACH_PORT_NULL)
{
/* If the name was a proper number, but the file
descriptor does not exist, we return EBADF instead
of ENOENT. */
error_t err = errno;
errno = save;
return err;
}
errno = save;
if (*end == '\0')
return 0;
else
{
/* Do a normal retry on the remaining components. */
startdir = *result;
dealloc_dir = 1;
file_name = end + 1; /* Skip the slash. */
break;
}
}
else
goto bad_magic;
break;
case 'm':
if (retryname[1] == 'a' && retryname[2] == 'c' &&
retryname[3] == 'h' && retryname[4] == 't' &&
retryname[5] == 'y' && retryname[6] == 'p' &&
retryname[7] == 'e')
{
error_t err;
struct host_basic_info hostinfo;
mach_msg_type_number_t hostinfocnt = HOST_BASIC_INFO_COUNT;
char *p;
if (err = __host_info (__mach_host_self (), HOST_BASIC_INFO,
(natural_t *) &hostinfo,
&hostinfocnt))
return err;
if (hostinfocnt != HOST_BASIC_INFO_COUNT)
return EGRATUITOUS;
p = _itoa (hostinfo.cpu_subtype, &retryname[8], 10, 0);
*--p = '/';
p = _itoa (hostinfo.cpu_type, &retryname[8], 10, 0);
if (p < retryname)
abort (); /* XXX write this right if this ever happens */
if (p > retryname)
strcpy (retryname, p);
startdir = *result;
dealloc_dir = 1;
}
else
goto bad_magic;
break;
case 't':
if (retryname[1] == 't' && retryname[2] == 'y')
switch (retryname[3])
{
error_t opentty (file_t *result)
{
error_t err;
file_t unauth;
err = __USEPORT (CTTYID,
__termctty_open_terminal (port,
flags,
&unauth));
if (! err)
{
mach_port_t ref = __mach_reply_port ();
err = __io_reauthenticate
(unauth,
ref,
MACH_MSG_TYPE_MAKE_SEND);
if (! err)
err = __USEPORT
(AUTH, __auth_user_authenticate
(port,
unauth,
ref, MACH_MSG_TYPE_MAKE_SEND,
result));
__mach_port_deallocate (__mach_task_self (),
unauth);
__mach_port_destroy (__mach_task_self (), ref);
}
return err;
}
case '\0':
return opentty (result);
case '/':
if (err = opentty (&startdir))
return err;
dealloc_dir = 1;
strcpy (retryname, &retryname[4]);
break;
default:
goto bad_magic;
}
else
goto bad_magic;
break;
default:
bad_magic:
return EGRATUITOUS;
}
break;
default:
return EGRATUITOUS;
}
err = __dir_lookup (startdir, file_name, flags, mode,
&doretry, retryname, result);
}
}
weak_alias (__hurd_file_name_lookup_retry, hurd_file_name_lookup_retry)
error_t
__hurd_file_name_split (file_t crdir, file_t cwdir,
const char *file_name,
file_t *dir, char **name)
{
const char *lastslash;
error_t err;
lastslash = strrchr (file_name, '/');
if (lastslash != NULL)
{
if (lastslash == file_name)
{
/* "/foobar" => crdir + "foobar". */
*name = (char *) file_name + 1;
if (err = __mach_port_mod_refs (__mach_task_self (),
crdir, MACH_PORT_RIGHT_SEND, +1))
return err;
*dir = crdir;
return 0;
}
else
{
/* "/dir1/dir2/.../file". */
char dirname[lastslash - file_name + 1];
memcpy (dirname, file_name, lastslash - file_name);
dirname[lastslash - file_name] = '\0';
*name = (char *) lastslash + 1;
return __hurd_file_name_lookup (crdir, cwdir, dirname, 0, 0, dir);
}
}
else
{
/* "foobar" => cwdir + "foobar". */
*name = (char *) file_name;
if (err = __mach_port_mod_refs (__mach_task_self (),
cwdir, MACH_PORT_RIGHT_SEND, +1))
return err;
*dir = cwdir;
return 0;
}
}
weak_alias (__hurd_file_name_split, hurd_file_name_split)
file_t
__file_name_lookup (const char *file_name, int flags, mode_t mode)
{
error_t err;
file_t result, crdir, cwdir;
struct hurd_userlink crdir_ulink, cwdir_ulink;
crdir = _hurd_port_get (&_hurd_ports[INIT_PORT_CRDIR], &crdir_ulink);
cwdir = _hurd_port_get (&_hurd_ports[INIT_PORT_CWDIR], &cwdir_ulink);
err = __hurd_file_name_lookup (crdir, cwdir, file_name, flags, mode,
&result);
_hurd_port_free (&_hurd_ports[INIT_PORT_CRDIR], &crdir_ulink, crdir);
_hurd_port_free (&_hurd_ports[INIT_PORT_CWDIR], &cwdir_ulink, cwdir);
if (err)
return __hurd_fail (err), MACH_PORT_NULL;
else
return result;
}
weak_alias (__file_name_lookup, file_name_lookup)
file_t
__file_name_split (const char *file_name, char **name)
{
error_t err;
file_t dir, crdir, cwdir;
struct hurd_userlink crdir_ulink, cwdir_ulink;
crdir = _hurd_port_get (&_hurd_ports[INIT_PORT_CRDIR], &crdir_ulink);
cwdir = _hurd_port_get (&_hurd_ports[INIT_PORT_CWDIR], &cwdir_ulink);
err = __hurd_file_name_split (crdir, cwdir, file_name, &dir, name);
_hurd_port_free (&_hurd_ports[INIT_PORT_CRDIR], &crdir_ulink, crdir);
_hurd_port_free (&_hurd_ports[INIT_PORT_CWDIR], &cwdir_ulink, cwdir);
if (err)
{
errno = err;
return MACH_PORT_NULL;
}
else
return dir;
}
weak_alias (__file_name_split, file_name_split)