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Diffstat (limited to 'libhurd-cap/cap-user.c')
-rw-r--r--libhurd-cap/cap-user.c210
1 files changed, 0 insertions, 210 deletions
diff --git a/libhurd-cap/cap-user.c b/libhurd-cap/cap-user.c
deleted file mode 100644
index 593d5b4..0000000
--- a/libhurd-cap/cap-user.c
+++ /dev/null
@@ -1,210 +0,0 @@
-/* cap-user.c - User side of the capability implementation.
- Copyright (C) 2003 Free Software Foundation, Inc.
- Written by Marcus Brinkmann <marcus@gnu.org>
-
- This file is part of the GNU Hurd.
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This program 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with this program; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-#if HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <stdlib.h>
-#include <pthread.h>
-#include <assert.h>
-#include <errno.h>
-#include <stdint.h>
-#include <l4/thread.h>
-
-#include <hurd/cap.h>
-
-#include "cap-intern.h"
-
-
-/* This hash table maps server thread IDs to server connections. */
-static struct hurd_ihash server_to_sconn
- = HURD_IHASH_INITIALIZER (HURD_IHASH_NO_LOCP);
-
-/* This lock protects SERVER_TO_SCONN. You can also lock server
- connection objects while holding this lock. */
-static pthread_mutex_t server_to_sconn_lock = PTHREAD_MUTEX_INITIALIZER;
-
-
-/* Deallocate one reference for SCONN, which must be locked.
- SERVER_TO_SCONN_LOCK is not locked. Afterwards, SCONN is unlocked
- (if it still exists). */
-void
-_hurd_cap_sconn_dealloc (hurd_cap_sconn_t sconn)
-{
- assert (sconn->refs > 0);
-
- sconn->refs--;
- if (sconn->refs > 0)
- {
- pthread_mutex_unlock (&sconn->lock);
- return;
- }
-
- /* We have to get SERVER_TO_SCONN_LOCK, but the locking order does
- not allow us to do it directly. So we release SCONN
- temporarily. */
- sconn->refs = 1;
- pthread_mutex_unlock (&sconn->lock);
- pthread_mutex_lock (&server_to_sconn_lock);
- pthread_mutex_lock (&sconn->lock);
- assert (sconn->refs > 0);
- sconn->refs--;
- if (sconn->refs > 0)
- {
- pthread_mutex_unlock (&sconn->lock);
- return;
- }
-
- /* Now we can remove the object. */
- hurd_ihash_remove (&server_to_sconn, sconn->server_thread);
- pthread_mutex_unlock (&server_to_sconn_lock);
-
- /* Finally, we can destroy it. */
- pthread_mutex_unlock (&sconn->lock);
- pthread_mutex_destroy (&sconn->lock);
- hurd_ihash_destroy (&sconn->id_to_cap);
- if (sconn->server_task_info)
- hurd_cap_deallocate (sconn->server_task_info);
- free (sconn);
-}
-
-
-/* Remove the entry for the capability ID SCID from the server
- connection SCONN. SCONN is locked. Afterwards, SCONN is
- unlocked. */
-void
-_hurd_cap_sconn_remove (hurd_cap_sconn_t sconn, l4_word_t scid)
-{
- /* Remove the capability object pointer, which is now invalid. */
- hurd_ihash_remove (&sconn->id_to_cap, scid);
-
- /* FIXME: The following should be some low level RPC to deallocate
- the capability on the server side. If it fails, then what can we
- do at this point? */
- hurd_cap_server_deallocate (sconn->server_thread, scid);
-
- _hurd_cap_sconn_dealloc (sconn);
-}
-
-
-/* Enter a new send capability provided by the server SERVER_THREAD
- (with the task ID reference SERVER_TASK_INFO) and the cap ID SCID.
- SCONN is the server connection for SERVER_THREAD, if known. It
- should be unlocked. If SCONN is NULL, then SERVER_TASK_INFO should
- be the task info capability for the server SERVER_THREAD, otherwise
- it must be HURD_CAP_NULL. Both, SCONN and SERVER_TASK_INFO, are
- consumed if used. If successful, the locked capability is returned
- with one (additional) reference in CAP. The server connection and
- capability object are created if necessary. */
-error_t
-_hurd_cap_sconn_enter (hurd_cap_sconn_t sconn_provided,
- hurd_task_info_t server_task_info,
- l4_thread_id_t server_thread, uint32_t scid,
- hurd_cap_t *cap)
-{
- hurd_cap_sconn_t sconn = sconn_provided;
- int sconn_created = 0;
-
- if (sconn)
- assert (l4_is_thread_equal (sconn->server_thread, server_thread));
- else
- {
- /* It might have become available by now. */
- pthread_mutex_lock (&server_to_sconn_lock);
- sconn = hurd_ihash_find (&server_to_sconn, server_thread);
- if (sconn)
- hurd_cap_deallocate (server_task_info);
- else
- {
- error_t err;
-
- sconn = malloc (sizeof (*sconn));
- if (!sconn)
- {
- pthread_mutex_unlock (&server_to_sconn_lock);
- hurd_cap_deallocate (server_task_info);
- return errno;
- }
- err = pthread_mutex_init (&sconn->lock, NULL);
- if (err)
- {
- free (sconn);
- pthread_mutex_unlock (&server_to_sconn_lock);
- hurd_cap_deallocate (server_task_info);
- return errno;
- }
-
- hurd_ihash_init (&sconn->id_to_cap, HURD_IHASH_NO_LOCP);
- sconn->server_thread = server_thread;
- sconn->server_task_info = server_task_info;
- sconn->refs = 0;
-
- /* Enter the new server connection object. */
- err = hurd_ihash_add (&server_to_sconn, server_thread, sconn);
- if (err)
- {
- pthread_mutex_destroy (&sconn->lock);
- hurd_ihash_destroy (&sconn->id_to_cap);
- free (sconn);
- pthread_mutex_unlock (&server_to_sconn_lock);
- hurd_cap_deallocate (server_task_info);
- return errno;
- }
- }
- }
- pthread_mutex_lock (&sconn->lock);
- pthread_mutex_unlock (&server_to_sconn_lock);
-
- (*cap) = hurd_ihash_find (&sconn->id_to_cap, scid);
- if (!cap)
- {
- error_t err = hurd_slab_alloc (cap_space, cap);
- if (err)
- {
- _hurd_cap_sconn_dealloc (sconn);
- return err;
- }
-
- (*cap)->sconn = sconn;
- (*cap)->scid = scid;
-#if 0
- (*cap)->dead_cb = NULL;
-#endif
-
- err = hurd_ihash_add (&sconn->id_to_cap, scid, *cap);
- if (err)
- {
- _hurd_cap_sconn_dealloc (sconn);
- hurd_slab_dealloc (cap_space, *cap);
- return err;
- }
- }
- pthread_mutex_lock (&(*cap)->lock);
- (*cap)->srefs++;
- /* We have to add a reference for the capability we have added,
- unless we are consuming the reference that was provided. */
- if (!sconn_provided)
- sconn->refs++;
- pthread_mutex_unlock (&sconn->lock);
-
- return 0;
-}
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