Merged in dstaesse/ouroboros/be-ipcp (pull request #363)

ipcpd: Refactor ipcpi struct

1 files changed, 511 insertions, 0 deletions

diff --git a/src/ipcpd/shim-data.c b/src/ipcpd/shim-data.c
new file mode 100644
index 00000000..933f3a64
--- /dev/null
+++ b/src/ipcpd/shim-data.c
@@ -0,0 +1,511 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * IPC process utilities
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/config.h>
+#include <ouroboros/list.h>
+#include <ouroboros/time_utils.h>
+#include <ouroboros/errno.h>
+
+#include "shim-data.h"
+#include "ipcp.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+struct reg_entry {
+        struct list_head list;
+        char *           name;
+};
+
+struct dir_entry {
+        struct list_head list;
+        char *           name;
+        uint64_t         addr;
+};
+
+static struct reg_entry * reg_entry_create(char * name)
+{
+        struct reg_entry * entry = malloc(sizeof(*entry));
+        if (entry == NULL)
+                return NULL;
+
+        assert(name);
+
+        entry->name = name;
+        if (entry->name == NULL)
+                return NULL;
+
+        return entry;
+}
+
+static void reg_entry_destroy(struct reg_entry * entry)
+{
+        assert(entry);
+
+        if (entry->name != NULL)
+                free(entry->name);
+
+        free(entry);
+}
+
+static struct dir_entry * dir_entry_create(char *   name,
+                                           uint64_t addr)
+{
+        struct dir_entry * entry = malloc(sizeof(*entry));
+        if (entry == NULL)
+                return NULL;
+
+        assert(name);
+
+        entry->addr    = addr;
+        entry->name = name;
+        if (entry->name == NULL)
+                return NULL;
+
+        return entry;
+}
+
+static void dir_entry_destroy(struct dir_entry * entry)
+{
+        assert(entry);
+
+        if (entry->name != NULL)
+                free(entry->name);
+
+        free(entry);
+}
+
+struct shim_data * shim_data_create()
+{
+        struct shim_data * sd = malloc(sizeof(*sd));
+        if (sd == NULL)
+                return NULL;
+
+        /* init the lists */
+        list_head_init(&sd->registry);
+        list_head_init(&sd->directory);
+        list_head_init(&sd->dir_queries);
+
+        /* init the locks */
+        pthread_rwlock_init(&sd->reg_lock, NULL);
+        pthread_rwlock_init(&sd->dir_lock, NULL);
+        pthread_mutex_init(&sd->dir_queries_lock, NULL);
+
+        return sd;
+}
+
+static void clear_registry(struct shim_data * data)
+{
+        struct list_head * h;
+        struct list_head * t;
+
+        assert(data);
+
+        list_for_each_safe(h, t, &data->registry) {
+                struct reg_entry * e = list_entry(h, struct reg_entry, list);
+                list_del(&e->list);
+                reg_entry_destroy(e);
+        }
+}
+
+static void clear_directory(struct shim_data * data)
+{
+        struct list_head * h;
+        struct list_head * t;
+
+        assert(data);
+
+        list_for_each_safe(h, t, &data->directory) {
+                struct dir_entry * e = list_entry(h, struct dir_entry, list);
+                list_del(&e->list);
+                dir_entry_destroy(e);
+        }
+}
+
+static void clear_dir_queries(struct shim_data * data)
+{
+        struct list_head * h;
+        struct list_head * t;
+
+        assert(data);
+
+        list_for_each_safe(h, t, &data->dir_queries) {
+                struct dir_query * e = list_entry(h, struct dir_query, next);
+                list_del(&e->next);
+                shim_data_dir_query_destroy(e);
+        }
+}
+
+void shim_data_destroy(struct shim_data * data)
+{
+        if (data == NULL)
+                return;
+
+        /* clear the lists */
+        pthread_rwlock_wrlock(&data->reg_lock);
+        clear_registry(data);
+        pthread_rwlock_unlock(&data->reg_lock);
+
+        pthread_rwlock_wrlock(&data->dir_lock);
+        clear_directory(data);
+        pthread_rwlock_unlock(&data->dir_lock);
+
+        pthread_mutex_lock(&data->dir_queries_lock);
+        clear_dir_queries(data);
+        pthread_mutex_unlock(&data->dir_queries_lock);
+
+        pthread_rwlock_destroy(&data->dir_lock);
+        pthread_rwlock_destroy(&data->reg_lock);
+        pthread_mutex_destroy(&data->dir_queries_lock);
+
+        free(data);
+}
+
+static struct reg_entry * find_reg_entry_by_name(struct shim_data * data,
+                                                 const char *       name)
+{
+        struct list_head * h;
+
+        assert(data);
+        assert(name);
+
+        list_for_each(h, &data->registry) {
+                struct reg_entry * e = list_entry(h, struct reg_entry, list);
+                if (!strcmp(e->name, name))
+                        return e;
+        }
+
+        return NULL;
+}
+
+static struct dir_entry * find_dir_entry(struct shim_data * data,
+                                         const char *       name,
+                                         uint64_t           addr)
+{
+        struct list_head * h;
+        list_for_each(h, &data->directory) {
+                struct dir_entry * e = list_entry(h, struct dir_entry, list);
+                if (e->addr == addr && !strcmp(e->name, name))
+                        return e;
+        }
+
+        return NULL;
+}
+
+static struct dir_entry * find_dir_entry_any(struct shim_data * data,
+                                             const char *       name)
+{
+        struct list_head * h;
+        list_for_each(h, &data->directory) {
+                struct dir_entry * e = list_entry(h, struct dir_entry, list);
+                if (!strcmp(e->name, name))
+                        return e;
+        }
+
+        return NULL;
+}
+
+int shim_data_reg_add_entry(struct shim_data * data,
+                            char *             name)
+{
+        struct reg_entry * entry;
+
+        if (data == NULL || name == NULL)
+                return -1;
+
+        pthread_rwlock_wrlock(&data->reg_lock);
+
+        if (find_reg_entry_by_name(data, name)) {
+                pthread_rwlock_unlock(&data->reg_lock);
+                return -1;
+        }
+
+        entry = reg_entry_create(name);
+        if (entry == NULL) {
+                pthread_rwlock_unlock(&data->reg_lock);
+                return -1;
+        }
+
+        list_add(&entry->list, &data->registry);
+
+        pthread_rwlock_unlock(&data->reg_lock);
+
+        return 0;
+}
+
+int shim_data_reg_del_entry(struct shim_data * data,
+                            const char *       name)
+{
+        struct reg_entry * e;
+        if (data == NULL)
+                return -1;
+
+        pthread_rwlock_wrlock(&data->reg_lock);
+
+        e = find_reg_entry_by_name(data, name);
+        if (e == NULL) {
+                pthread_rwlock_unlock(&data->reg_lock);
+                return 0; /* nothing to do */
+        }
+
+        list_del(&e->list);
+
+        pthread_rwlock_unlock(&data->reg_lock);
+
+        reg_entry_destroy(e);
+
+        return 0;
+}
+
+bool shim_data_reg_has(struct shim_data * data,
+                       const char *       name)
+{
+        bool ret = false;
+
+        if (data == NULL || name == NULL)
+                return false;
+
+        pthread_rwlock_rdlock(&data->reg_lock);
+
+        ret = (find_reg_entry_by_name(data, name) != NULL);
+
+        pthread_rwlock_unlock(&data->reg_lock);
+
+        return ret;
+}
+
+int shim_data_dir_add_entry(struct shim_data * data,
+                            char *             name,
+                            uint64_t           addr)
+{
+        struct dir_entry * entry;
+        char * entry_name;
+
+        if (data == NULL || name == NULL)
+                return -1;
+
+        pthread_rwlock_wrlock(&data->dir_lock);
+
+        if (find_dir_entry(data, name, addr) != NULL) {
+                pthread_rwlock_unlock(&data->dir_lock);
+                return -1;
+        }
+
+        entry_name = strdup(name);
+        if (entry_name == NULL) {
+                pthread_rwlock_unlock(&data->dir_lock);
+                return -1;
+        }
+
+        entry = dir_entry_create(entry_name, addr);
+        if (entry == NULL) {
+                pthread_rwlock_unlock(&data->dir_lock);
+                return -1;
+        }
+
+        list_add(&entry->list,&data->directory);
+
+        pthread_rwlock_unlock(&data->dir_lock);
+
+        return 0;
+}
+
+int shim_data_dir_del_entry(struct shim_data * data,
+                            const char *       name,
+                            uint64_t           addr)
+{
+        struct dir_entry * e;
+        if (data == NULL)
+                return -1;
+
+        pthread_rwlock_wrlock(&data->dir_lock);
+
+        e = find_dir_entry(data, name, addr);
+        if (e == NULL) {
+                pthread_rwlock_unlock(&data->dir_lock);
+                return 0; /* nothing to do */
+        }
+
+        list_del(&e->list);
+
+        pthread_rwlock_unlock(&data->dir_lock);
+
+        dir_entry_destroy(e);
+
+        return 0;
+}
+
+bool shim_data_dir_has(struct shim_data * data,
+                       const char *       name)
+{
+        bool ret = false;
+
+        pthread_rwlock_rdlock(&data->dir_lock);
+
+        ret = (find_dir_entry_any(data, name) != NULL);
+
+        pthread_rwlock_unlock(&data->dir_lock);
+
+        return ret;
+}
+
+uint64_t shim_data_dir_get_addr(struct shim_data * data,
+                                const char *       name)
+{
+        struct dir_entry * entry;
+        uint64_t           addr;
+
+        pthread_rwlock_rdlock(&data->dir_lock);
+
+        entry = find_dir_entry_any(data, name);
+
+        if (entry == NULL) {
+                pthread_rwlock_unlock(&data->dir_lock);
+                return 0; /* undefined behaviour, 0 may be a valid address */
+        }
+
+        addr = entry->addr;
+
+        pthread_rwlock_unlock(&data->dir_lock);
+
+        return addr;
+}
+
+struct dir_query * shim_data_dir_query_create(char * name)
+{
+        struct dir_query * query;
+        pthread_condattr_t cattr;
+
+        query = malloc(sizeof(*query));
+        if (query == NULL)
+                return NULL;
+
+        query->name = strdup(name);
+        if (query->name == NULL) {
+                free(query);
+                return NULL;
+        }
+
+        query->state = QUERY_INIT;
+
+        pthread_condattr_init(&cattr);
+#ifndef __APPLE__
+        pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK);
+#endif
+        pthread_cond_init(&query->cond, &cattr);
+        pthread_mutex_init(&query->lock, NULL);
+
+        list_head_init(&query->next);
+
+        return query;
+}
+
+void shim_data_dir_query_respond(struct dir_query * query)
+{
+        assert(query);
+
+        pthread_mutex_lock(&query->lock);
+
+        if (query->state != QUERY_PENDING) {
+                pthread_mutex_unlock(&query->lock);
+                return;
+        }
+
+        query->state = QUERY_RESPONSE;
+        pthread_cond_broadcast(&query->cond);
+
+        while (query->state == QUERY_RESPONSE)
+                pthread_cond_wait(&query->cond, &query->lock);
+
+        pthread_mutex_unlock(&query->lock);
+}
+
+void shim_data_dir_query_destroy(struct dir_query * query)
+{
+        assert(query);
+
+        pthread_mutex_lock(&query->lock);
+
+        if (query->state == QUERY_DESTROY) {
+                pthread_mutex_unlock(&query->lock);
+                return;
+        }
+
+        if (query->state == QUERY_INIT)
+                query->state = QUERY_DONE;
+
+        if (query->state == QUERY_PENDING) {
+                query->state = QUERY_DESTROY;
+                pthread_cond_broadcast(&query->cond);
+        }
+
+        while (query->state != QUERY_DONE)
+                pthread_cond_wait(&query->cond, &query->lock);
+
+        pthread_mutex_unlock(&query->lock);
+
+        pthread_cond_destroy(&query->cond);
+        pthread_mutex_destroy(&query->lock);
+
+        free(query->name);
+        free(query);
+}
+
+int shim_data_dir_query_wait(struct dir_query *      query,
+                             const struct timespec * timeout)
+{
+        struct timespec abstime;
+        int ret = 0;
+
+        assert(query);
+        assert(timeout);
+
+        clock_gettime(PTHREAD_COND_CLOCK, &abstime);
+        ts_add(&abstime, timeout, &abstime);
+
+        pthread_mutex_lock(&query->lock);
+
+        if (query->state != QUERY_INIT) {
+                pthread_mutex_unlock(&query->lock);
+                return -EINVAL;
+        }
+
+        query->state = QUERY_PENDING;
+
+        while (query->state == QUERY_PENDING) {
+                if ((ret = -pthread_cond_timedwait(&query->cond,
+                                                   &query->lock,
+                                                   &abstime)) == -ETIMEDOUT)
+                        break;
+        }
+
+        if (query->state == QUERY_DESTROY)
+                ret = -1;
+
+        query->state = QUERY_DONE;
+        pthread_cond_broadcast(&query->cond);
+
+        pthread_mutex_unlock(&query->lock);
+
+        return ret;
+}