diff options
Diffstat (limited to 'libhurd-cap-server/client-create.c')
| -rw-r--r-- | libhurd-cap-server/client-create.c | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/libhurd-cap-server/client-create.c b/libhurd-cap-server/client-create.c deleted file mode 100644 index ac8c54a..0000000 --- a/libhurd-cap-server/client-create.c +++ /dev/null @@ -1,213 +0,0 @@ -/* client-create.c - Create a capability client. - Copyright (C) 2004, 2005 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 <errno.h> -#include <assert.h> -#include <pthread.h> -#include <stdlib.h> - -#include "cap-server-intern.h" - - -/* Client management code. */ - -/* Allocate a new capability client structure for the slab cache. */ -static error_t -_hurd_cap_client_constructor (void *hook, void *buffer) -{ - _hurd_cap_client_t client = (_hurd_cap_client_t) buffer; - error_t err; - - err = pthread_mutex_init (&client->lock, NULL); - if (err) - return err; - - client->state = _HURD_CAP_STATE_GREEN; - client->pending_rpcs = NULL; - - /* Capabilities are mapped to clients many to many, so we can not - use a location pointer. However, this is not critical as - removing an entry only blocks out RPCs for the same client, and - not others. */ - hurd_ihash_init (&client->caps_reverse, HURD_IHASH_NO_LOCP); - - return 0; - - /* This is provided here in case you add more initialization to the - end of the above code. */ -#if 0 - pthread_mutex_destroy (&client->lock); - - return err; -#endif -} - - -/* Allocate a new capability client structure for the slab cache. */ -static void -_hurd_cap_client_destructor (void *hook, void *buffer) -{ - _hurd_cap_client_t client = (_hurd_cap_client_t) buffer; - - hurd_ihash_destroy (&client->caps_reverse); - hurd_table_destroy (&client->caps); - pthread_mutex_destroy (&client->lock); -} - - -/* The global slab for all capability clients. */ -struct hurd_slab_space _hurd_cap_client_space - = HURD_SLAB_SPACE_INITIALIZER (struct _hurd_cap_client, NULL, NULL, - _hurd_cap_client_constructor, - _hurd_cap_client_destructor, NULL); - - -static error_t -_hurd_cap_client_alloc (hurd_task_id_t task_id, - _hurd_cap_client_t *r_client) -{ - error_t err; - void *new_client; - _hurd_cap_client_t client; - - err = hurd_slab_alloc (&_hurd_cap_client_space, &new_client); - if (err) - return err; - - client = new_client; - - /* CLIENT->id will be initialized by the caller when adding the - client to the client table of the class. */ - client->task_id = task_id; - - err = hurd_table_init (&client->caps, sizeof (_hurd_cap_obj_entry_t)); - if (err) - { - free (client); - return err; - } - - /* FIXME: We need to acquire a task info capability here. The task - death notifications have been suspended by the caller. */ - - *r_client = client; - return 0; -} - - -/* Look up the client with the task ID TASK in the bucket BUCKET, and - return it in R_CLIENT, with one additional reference. If it is not - found, create it. */ -error_t -__attribute__((visibility("hidden"))) -_hurd_cap_client_create (hurd_cap_bucket_t bucket, - hurd_task_id_t task_id, - _hurd_cap_client_t *r_client) -{ - error_t err = 0; - _hurd_cap_client_t client; - - pthread_mutex_lock (&bucket->lock); - client = (_hurd_cap_client_t) hurd_ihash_find (&bucket->clients_reverse, - task_id); - if (client) - { - if (client->dead) - err = EINVAL; /* FIXME: A more appropriate code? */ - else - { - client->refs++; - *r_client = client; - } - pthread_mutex_unlock (&bucket->lock); - return err; - } - pthread_mutex_unlock (&bucket->lock); - - /* The client is not yet registered. Block out processing task - death notifications, create a new client structure, and then - enter it into the table before resuming task death - notifications. */ - hurd_task_death_notify_suspend (); - err = _hurd_cap_client_alloc (task_id, r_client); - if (err) - { - hurd_task_death_notify_resume (); - return err; - } - - pthread_mutex_lock (&bucket->lock); - /* Since we dropped the bucket lock during the allocation (which is - potentially long) we need to check that somebody else didn't - already allocate a client data structure. If so, we can just use - that. Otherwise, we continue. */ - client = (_hurd_cap_client_t) hurd_ihash_find (&bucket->clients_reverse, - task_id); - if (client) - { - if (client->dead) - { - err = EINVAL; /* FIXME: A more appropriate code? */ - pthread_mutex_unlock (&bucket->lock); - } - else - { - /* Somebody else was indeed faster. Use the existing entry. */ - client->refs++; - pthread_mutex_unlock (&bucket->lock); - _hurd_cap_client_dealloc (bucket, *r_client); - *r_client = client; - } - return err; - } - - client = *r_client; - - /* One reference for the fact that the client task lives, one for - the caller. */ - client->refs = 2; - - err = hurd_table_enter (&bucket->clients, &client, &client->id); - if (!err) - { - err = hurd_ihash_add (&bucket->clients_reverse, task_id, client); - if (err) - hurd_table_remove (&bucket->clients, client->id); - } - if (err) - { - pthread_mutex_unlock (&bucket->lock); - hurd_task_death_notify_resume (); - - _hurd_cap_client_dealloc (bucket, client); - return err; - } - pthread_mutex_unlock (&bucket->lock); - hurd_task_death_notify_resume (); - - *r_client = client; - - return 0; -} |