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-rw-r--r--svm/svmdb.c520
1 files changed, 520 insertions, 0 deletions
diff --git a/svm/svmdb.c b/svm/svmdb.c
new file mode 100644
index 00000000000..515bc7d276b
--- /dev/null
+++ b/svm/svmdb.c
@@ -0,0 +1,520 @@
+/*
+ *------------------------------------------------------------------
+ * svmdb.c -- simple shared memory database
+ *
+ * Copyright (c) 2009 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <signal.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <time.h>
+#include <fcntl.h>
+#include <string.h>
+#include <vppinfra/clib.h>
+#include <vppinfra/vec.h>
+#include <vppinfra/hash.h>
+#include <vppinfra/bitmap.h>
+#include <vppinfra/fifo.h>
+#include <vppinfra/time.h>
+#include <vppinfra/mheap.h>
+#include <vppinfra/heap.h>
+#include <vppinfra/pool.h>
+#include <vppinfra/format.h>
+
+#include "svmdb.h"
+
+static void local_set_variable_nolock (svmdb_client_t *client,
+ svmdb_namespace_t namespace,
+ u8 * var, u8 * val, u32 elsize);
+
+always_inline void region_lock(svm_region_t *rp, int tag)
+{
+ pthread_mutex_lock(&rp->mutex);
+#ifdef MUTEX_DEBUG
+ rp->mutex_owner_pid = getpid();
+ rp->mutex_owner_tag = tag;
+#endif
+}
+
+always_inline void region_unlock(svm_region_t *rp)
+{
+#ifdef MUTEX_DEBUG
+ rp->mutex_owner_pid = 0;
+ rp->mutex_owner_tag = 0;
+#endif
+ pthread_mutex_unlock(&rp->mutex);
+}
+
+static svmdb_client_t *svmdb_map_internal (char *root_path, uword size)
+{
+ svmdb_client_t *client = 0;
+ svm_map_region_args_t *a = 0;
+ svm_region_t *db_rp;
+ void *oldheap;
+ svmdb_shm_hdr_t *hp = 0;
+
+ vec_validate (client, 0);
+ vec_validate (a, 0);
+
+ svm_region_init_chroot(root_path);
+
+ a->root_path = root_path;
+ a->name = "/db";
+ a->size = size ? size : SVMDB_DEFAULT_SIZE;
+ a->flags = SVM_FLAGS_MHEAP;
+
+ db_rp = client->db_rp = svm_region_find_or_create (a);
+
+ ASSERT(db_rp);
+
+ vec_free (a);
+
+ region_lock (client->db_rp, 10);
+ /* Has someone else set up the shared-memory variable table? */
+ if (db_rp->user_ctx) {
+ client->shm = (void *) db_rp->user_ctx;
+ client->pid = getpid();
+ region_unlock (client->db_rp);
+ ASSERT (client->shm->version == SVMDB_SHM_VERSION);
+ return (client);
+ }
+ /* Nope, it's our problem... */
+
+ /* Add a bogus client (pid=0) so the svm won't be deallocated */
+ oldheap = svm_push_pvt_heap (db_rp);
+ vec_add1(client->db_rp->client_pids, 0);
+ svm_pop_heap (oldheap);
+
+ oldheap = svm_push_data_heap (db_rp);
+
+ vec_validate(hp, 0);
+ hp->version = SVMDB_SHM_VERSION;
+ hp->namespaces[SVMDB_NAMESPACE_STRING]
+ = hash_create_string(0, sizeof(uword));
+ hp->namespaces[SVMDB_NAMESPACE_VEC]
+ = hash_create_string(0, sizeof(uword));
+
+ db_rp->user_ctx = hp;
+ client->shm = hp;
+
+ svm_pop_heap (oldheap);
+ region_unlock (client->db_rp);
+ client->pid = getpid();
+
+ return (client);
+}
+svmdb_client_t *svmdb_map (void)
+{
+ return svmdb_map_internal (0, 0);
+}
+
+svmdb_client_t *svmdb_map_size (uword size)
+{
+ return svmdb_map_internal (0, size);
+}
+
+svmdb_client_t *svmdb_map_chroot (char *root_path)
+{
+ return svmdb_map_internal (root_path, 0);
+}
+
+svmdb_client_t *svmdb_map_chroot_size (char *root_path, uword size)
+{
+ return svmdb_map_internal (root_path, size);
+}
+
+void svmdb_unmap (svmdb_client_t *client)
+{
+ ASSERT(client);
+
+ if (! svm_get_root_rp())
+ return;
+
+ svm_region_unmap ((void *) client->db_rp);
+ svm_region_exit ();
+ vec_free(client);
+}
+
+static void notify_value (svmdb_value_t * v, svmdb_action_t a)
+{
+ int i;
+ int rv;
+ union sigval sv;
+ u32 value;
+ u32 *dead_registrations = 0;
+
+ svmdb_notify_t *np;
+
+ for (i = 0; i < vec_len (v->notifications); i++) {
+ np = vec_elt_at_index (v->notifications, i);
+ if (np->action == a) {
+ value = (np->action<<28) | (np->opaque);
+ sv.sival_ptr = (void *)(uword)value;
+ do {
+ rv = 0;
+ if (sigqueue (np->pid, np->signum, sv) == 0)
+ break;
+ rv = errno;
+ } while (rv == EAGAIN);
+ if (rv == 0)
+ continue;
+ vec_add1 (dead_registrations, i);
+ }
+ }
+
+ for (i = 0; i < vec_len (dead_registrations); i++) {
+ np = vec_elt_at_index (v->notifications, dead_registrations[i]);
+ clib_warning ("dead reg pid %d sig %d action %d opaque %x",
+ np->pid, np->signum, np->action, np->opaque);
+ vec_delete (v->notifications, 1, dead_registrations[i]);
+ }
+ vec_free (dead_registrations);
+}
+
+int svmdb_local_add_del_notification (svmdb_client_t *client,
+ svmdb_notification_args_t *a)
+{
+ uword *h;
+ void *oldheap;
+ hash_pair_t *hp;
+ svmdb_shm_hdr_t * shm;
+ u8 *dummy_value = 0;
+ svmdb_value_t *value;
+ svmdb_notify_t *np;
+ int i;
+ int rv = 0;
+
+ ASSERT (a->elsize);
+
+ region_lock (client->db_rp, 18);
+ shm = client->shm;
+ oldheap = svm_push_data_heap (client->db_rp);
+
+ h = shm->namespaces[a->nspace];
+
+ hp = hash_get_pair_mem (h, a->var);
+ if (hp == 0) {
+ local_set_variable_nolock (client, a->nspace, (u8 *)a->var,
+ dummy_value, a->elsize);
+ /* might have moved */
+ h = shm->namespaces[a->nspace];
+ hp = hash_get_pair_mem (h, a->var);
+ ASSERT(hp);
+ }
+
+ value = pool_elt_at_index (shm->values, hp->value[0]);
+
+ for (i = 0; i < vec_len (value->notifications); i++) {
+ np = vec_elt_at_index (value->notifications, i);
+ if ((np->pid == client->pid)
+ && (np->signum == a->signum)
+ && (np->action == a->action)
+ && (np->opaque == a->opaque)) {
+ if (a->add_del == 0 /* delete */) {
+ vec_delete (value->notifications, 1, i);
+ goto out;
+ } else { /* add */
+ clib_warning (
+ "%s: ignore dup reg pid %d signum %d action %d opaque %x",
+ a->var, client->pid, a->signum, a->action, a->opaque);
+ rv = -2;
+ goto out;
+ }
+ }
+ }
+ if (a->add_del == 0) {
+ rv = -3;
+ goto out;
+ }
+
+ vec_add2 (value->notifications, np, 1);
+ np->pid = client->pid;
+ np->signum = a->signum;
+ np->action = a->action;
+ np->opaque = a->opaque;
+
+out:
+ svm_pop_heap(oldheap);
+ region_unlock (client->db_rp);
+ return rv;
+}
+
+
+static void local_unset_variable_nolock (svmdb_client_t *client,
+ svmdb_namespace_t namespace,
+ char * var)
+{
+ uword *h;
+ svmdb_value_t *oldvalue;
+ hash_pair_t *hp;
+
+ h = client->shm->namespaces[namespace];
+ hp = hash_get_pair_mem (h, var);
+ if (hp) {
+ oldvalue = pool_elt_at_index (client->shm->values, hp->value[0]);
+ if (vec_len (oldvalue->notifications))
+ notify_value (oldvalue, SVMDB_ACTION_UNSET);
+ /* zero length value means unset */
+ _vec_len (oldvalue->value) = 0;
+ }
+ client->shm->namespaces[namespace] = h;
+}
+
+void svmdb_local_unset_string_variable (svmdb_client_t *client, char *var)
+{
+ void *oldheap;
+
+ region_lock (client->db_rp, 11);
+ oldheap = svm_push_data_heap (client->db_rp);
+ local_unset_variable_nolock (client, SVMDB_NAMESPACE_STRING, var);
+ svm_pop_heap(oldheap);
+ region_unlock (client->db_rp);
+}
+
+static void local_set_variable_nolock (svmdb_client_t *client,
+ svmdb_namespace_t namespace,
+ u8 * var, u8 * val, u32 elsize)
+{
+ uword *h;
+ hash_pair_t *hp;
+ u8 *name;
+ svmdb_shm_hdr_t * shm;
+
+ shm = client->shm;
+ h = shm->namespaces[namespace];
+ hp = hash_get_pair_mem (h, var);
+ if (hp) {
+ svmdb_value_t * oldvalue;
+ oldvalue = pool_elt_at_index (client->shm->values, hp->value[0]);
+ vec_alloc (oldvalue->value, vec_len(val)*elsize);
+ memcpy (oldvalue->value, val, vec_len(val)*elsize);
+ _vec_len (oldvalue->value) = vec_len(val);
+ notify_value (oldvalue, SVMDB_ACTION_SET);
+ } else {
+ svmdb_value_t * newvalue;
+ pool_get (shm->values, newvalue);
+ memset (newvalue, 0, sizeof (*newvalue));
+ newvalue->elsize = elsize;
+ vec_alloc (newvalue->value, vec_len(val)*elsize);
+ memcpy (newvalue->value, val, vec_len(val)*elsize);
+ _vec_len (newvalue->value) = vec_len(val);
+ name = format (0, "%s%c", var, 0);
+ hash_set_mem (h, name, newvalue - shm->values);
+ }
+ shm->namespaces[namespace] = h;
+}
+
+void svmdb_local_set_string_variable (svmdb_client_t *client,
+ char *var, char *val)
+{
+ void *oldheap;
+
+ region_lock (client->db_rp, 12);
+ oldheap = svm_push_data_heap (client->db_rp);
+
+ local_unset_variable_nolock (client, SVMDB_NAMESPACE_STRING, var);
+
+ local_set_variable_nolock (client, SVMDB_NAMESPACE_STRING,
+ (u8 *) var, (u8 *) val, 1 /* elsize */);
+ svm_pop_heap(oldheap);
+ region_unlock (client->db_rp);
+}
+
+static u8 * local_get_variable_nolock (svmdb_client_t *client,
+ svmdb_namespace_t namespace,
+ u8 * var)
+{
+ uword *h;
+ uword *p;
+ svmdb_shm_hdr_t * shm;
+ svmdb_value_t *oldvalue;
+
+ shm = client->shm;
+ h = shm->namespaces[namespace];
+ p = hash_get_mem (h, var);
+ if (p) {
+ oldvalue = pool_elt_at_index (shm->values, p[0]);
+ notify_value (oldvalue, SVMDB_ACTION_GET);
+ return (oldvalue->value);
+ }
+ return 0;
+}
+
+void *svmdb_local_get_variable_reference (svmdb_client_t *client,
+ svmdb_namespace_t namespace,
+ char *var)
+{
+ u8 *rv;
+
+ region_lock (client->db_rp, 19);
+ rv = local_get_variable_nolock (client, namespace, (u8 *)var);
+ region_unlock (client->db_rp);
+ return (void *)rv;
+}
+
+char *svmdb_local_get_string_variable (svmdb_client_t *client, char *var)
+{
+ u8 *rv = 0;
+
+ region_lock (client->db_rp, 13);
+ rv = local_get_variable_nolock (client, SVMDB_NAMESPACE_STRING, (u8 *) var);
+
+ if (rv && vec_len (rv)) {
+ rv = format (0, "%s", rv);
+ vec_add1(rv, 0);
+ }
+ region_unlock (client->db_rp);
+ return ((char *) rv);
+}
+
+void svmdb_local_dump_strings (svmdb_client_t *client)
+{
+ uword *h;
+ u8 *key;
+ u32 value;
+ svmdb_shm_hdr_t *shm = client->shm;
+
+ region_lock (client->db_rp, 14);
+
+ h = client->shm->namespaces [SVMDB_NAMESPACE_STRING];
+
+ hash_foreach_mem(key, value, h,
+ ({
+ svmdb_value_t *v = pool_elt_at_index (shm->values, value);
+
+ fformat(stdout, "%s: %s\n", key,
+ vec_len(v->value) ? v->value : (u8 *)"(nil)");
+ }));
+ region_unlock (client->db_rp);
+}
+
+void svmdb_local_unset_vec_variable (svmdb_client_t *client, char *var)
+{
+ void *oldheap;
+
+ region_lock (client->db_rp, 15);
+ oldheap = svm_push_data_heap (client->db_rp);
+ local_unset_variable_nolock (client, SVMDB_NAMESPACE_VEC, var);
+ svm_pop_heap(oldheap);
+ region_unlock (client->db_rp);
+}
+
+void svmdb_local_set_vec_variable (svmdb_client_t *client,
+ char *var, void *val_arg, u32 elsize)
+{
+ u8 *val = (u8 *)val_arg;
+ void *oldheap;
+
+ region_lock (client->db_rp, 16);
+ oldheap = svm_push_data_heap (client->db_rp);
+
+ local_unset_variable_nolock (client, SVMDB_NAMESPACE_VEC, var);
+ local_set_variable_nolock (client, SVMDB_NAMESPACE_VEC, (u8 *) var,
+ val, elsize);
+
+ svm_pop_heap(oldheap);
+ region_unlock (client->db_rp);
+}
+
+void *svmdb_local_get_vec_variable (svmdb_client_t *client, char *var,
+ u32 elsize)
+{
+ u8 *rv = 0;
+ u8 *copy = 0;
+
+ region_lock (client->db_rp, 17);
+
+ rv = local_get_variable_nolock (client, SVMDB_NAMESPACE_VEC, (u8 *) var);
+
+ if (rv && vec_len(rv)) {
+ /* Make a copy in process-local memory */
+ vec_alloc (copy, vec_len(rv)*elsize);
+ memcpy (copy, rv, vec_len(rv)*elsize);
+ _vec_len(copy) = vec_len(rv);
+ region_unlock (client->db_rp);
+ return (copy);
+ }
+ region_unlock (client->db_rp);
+ return (0);
+}
+
+void svmdb_local_dump_vecs (svmdb_client_t *client)
+{
+ uword *h;
+ u8 *key;
+ u32 value;
+ svmdb_shm_hdr_t *shm;
+
+ region_lock (client->db_rp, 17);
+ shm = client->shm;
+
+ h = client->shm->namespaces [SVMDB_NAMESPACE_VEC];
+
+ hash_foreach_mem(key, value, h,
+ ({
+ svmdb_value_t *v = pool_elt_at_index (shm->values, value);
+ (void) fformat(stdout, "%s:\n %U\n", key,
+ format_hex_bytes, v->value,
+ vec_len(v->value)*v->elsize);
+ }));
+
+ region_unlock (client->db_rp);
+}
+
+void *svmdb_local_find_or_add_vec_variable (svmdb_client_t *client,
+ char *var, u32 nbytes)
+{
+ void *oldheap;
+ u8 *rv = 0;
+
+ region_lock (client->db_rp, 18);
+ oldheap = svm_push_data_heap (client->db_rp);
+
+ rv = local_get_variable_nolock (client, SVMDB_NAMESPACE_VEC, (u8 *)var);
+
+ if (rv) {
+ goto out;
+ } else {
+ uword *h;
+ u8 *name;
+ svmdb_shm_hdr_t * shm;
+ svmdb_value_t * newvalue;
+
+ shm = client->shm;
+ h = shm->namespaces[SVMDB_NAMESPACE_VEC];
+
+ pool_get (shm->values, newvalue);
+ memset (newvalue, 0, sizeof (*newvalue));
+ newvalue->elsize = 1;
+ vec_alloc (newvalue->value, nbytes);
+ _vec_len (newvalue->value) = nbytes;
+ name = format (0, "%s%c", var, 0);
+ hash_set_mem (h, name, newvalue - shm->values);
+ shm->namespaces[SVMDB_NAMESPACE_VEC] = h;
+ rv = newvalue->value;
+ }
+
+out:
+ svm_pop_heap(oldheap);
+ region_unlock (client->db_rp);
+ return (rv);
+}