--- /dev/null
+/*
+ * Copyright (C) 2019 Simon Marchi <simon.marchi@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#ifndef LTTNG_ACTION_START_SESSION_H
+#define LTTNG_ACTION_START_SESSION_H
+
+struct lttng_action;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Create a newly allocated start-session action object.
+ *
+ * A start session action object must have a session name set to be considered
+ * valid when used with a trigger object (lttng_trigger). A name can be set
+ * using `lttng_action_start_session_set_session_name`.
+ *
+ * Returns a new action on success, NULL on failure. This action must be
+ * destroyed using lttng_action_destroy().
+ */
+extern struct lttng_action *lttng_action_start_session_create(void);
+
+/*
+ * Set the session name of an lttng_action object of type
+ * LTTNG_ACTION_TYPE_START_SESSION.
+ */
+extern enum lttng_action_status lttng_action_start_session_set_session_name(
+ struct lttng_action *action, const char *session_name);
+
+/*
+ * Get the session name of an lttng_action object of type
+ * LTTNG_ACTION_TYPE_START_SESSION.
+ */
+extern enum lttng_action_status lttng_action_start_session_get_session_name(
+ const struct lttng_action *action, const char **session_name);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LTTNG_ACTION_START_SESSION_H */
--- /dev/null
+/*
+ * Copyright (C) 2019 Simon Marchi <simon.marchi@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#include <assert.h>
+#include <common/error.h>
+#include <common/macros.h>
+#include <lttng/action/action-internal.h>
+#include <lttng/action/start-session-internal.h>
+#include <lttng/action/start-session.h>
+
+#define IS_START_SESSION_ACTION(action) \
+ (lttng_action_get_type_const(action) == LTTNG_ACTION_TYPE_START_SESSION)
+
+struct lttng_action_start_session {
+ struct lttng_action parent;
+
+ /* Owned by this. */
+ char *session_name;
+};
+
+struct lttng_action_start_session_comm {
+ /* Includes the trailing \0. */
+ uint32_t session_name_len;
+
+ /*
+ * Variable data:
+ *
+ * - session name (null terminated)
+ */
+ char data[];
+} LTTNG_PACKED;
+
+static struct lttng_action_start_session *action_start_session_from_action(
+ struct lttng_action *action)
+{
+ assert(action);
+
+ return container_of(action, struct lttng_action_start_session, parent);
+}
+
+static const struct lttng_action_start_session *
+action_start_session_from_action_const(const struct lttng_action *action)
+{
+ assert(action);
+
+ return container_of(action, struct lttng_action_start_session, parent);
+}
+
+static bool lttng_action_start_session_validate(struct lttng_action *action)
+{
+ bool valid;
+ struct lttng_action_start_session *action_start_session;
+
+ if (!action) {
+ valid = false;
+ goto end;
+ }
+
+ action_start_session = action_start_session_from_action(action);
+
+ /* A non-empty session name is mandatory. */
+ if (!action_start_session->session_name ||
+ strlen(action_start_session->session_name) == 0) {
+ valid = false;
+ goto end;
+ }
+
+ valid = true;
+end:
+ return valid;
+}
+
+static bool lttng_action_start_session_is_equal(
+ const struct lttng_action *_a, const struct lttng_action *_b)
+{
+ bool is_equal = false;
+ struct lttng_action_start_session *a, *b;
+
+ a = container_of(_a, struct lttng_action_start_session, parent);
+ b = container_of(_b, struct lttng_action_start_session, parent);
+
+ /* Action is not valid if this is not true. */
+ assert(a->session_name);
+ assert(b->session_name);
+ if (strcmp(a->session_name, b->session_name)) {
+ goto end;
+ }
+
+ is_equal = true;
+end:
+ return is_equal;
+}
+
+static int lttng_action_start_session_serialize(
+ struct lttng_action *action, struct lttng_dynamic_buffer *buf)
+{
+ struct lttng_action_start_session *action_start_session;
+ struct lttng_action_start_session_comm comm;
+ size_t session_name_len;
+ int ret;
+
+ assert(action);
+ assert(buf);
+
+ action_start_session = action_start_session_from_action(action);
+
+ assert(action_start_session->session_name);
+
+ DBG("Serializing start session action: session-name: %s",
+ action_start_session->session_name);
+
+ session_name_len = strlen(action_start_session->session_name) + 1;
+ comm.session_name_len = session_name_len;
+
+ ret = lttng_dynamic_buffer_append(buf, &comm, sizeof(comm));
+ if (ret) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = lttng_dynamic_buffer_append(buf,
+ action_start_session->session_name, session_name_len);
+ if (ret) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = 0;
+end:
+ return ret;
+}
+
+static void lttng_action_start_session_destroy(struct lttng_action *action)
+{
+ struct lttng_action_start_session *action_start_session;
+
+ if (!action) {
+ goto end;
+ }
+
+ action_start_session = action_start_session_from_action(action);
+
+ free(action_start_session->session_name);
+ free(action_start_session);
+
+end:
+ return;
+}
+
+ssize_t lttng_action_start_session_create_from_buffer(
+ const struct lttng_buffer_view *view,
+ struct lttng_action **p_action)
+{
+ ssize_t consumed_len;
+ const struct lttng_action_start_session_comm *comm;
+ const char *session_name;
+ struct lttng_action *action;
+ enum lttng_action_status status;
+
+ action = lttng_action_start_session_create();
+ if (!action) {
+ consumed_len = -1;
+ goto end;
+ }
+
+ comm = (const struct lttng_action_start_session_comm *) view->data;
+ session_name = (const char *) &comm->data;
+
+ if (!lttng_buffer_view_contains_string(
+ view, session_name, comm->session_name_len)) {
+ consumed_len = -1;
+ goto end;
+ }
+
+ status = lttng_action_start_session_set_session_name(
+ action, session_name);
+ if (status != LTTNG_ACTION_STATUS_OK) {
+ consumed_len = -1;
+ goto end;
+ }
+
+ consumed_len = sizeof(struct lttng_action_start_session_comm) +
+ comm->session_name_len;
+ *p_action = action;
+ action = NULL;
+
+end:
+ lttng_action_start_session_destroy(action);
+
+ return consumed_len;
+}
+
+struct lttng_action *lttng_action_start_session_create(void)
+{
+ struct lttng_action *action;
+
+ action = zmalloc(sizeof(struct lttng_action_start_session));
+ if (!action) {
+ goto end;
+ }
+
+ lttng_action_init(action, LTTNG_ACTION_TYPE_START_SESSION,
+ lttng_action_start_session_validate,
+ lttng_action_start_session_serialize,
+ lttng_action_start_session_is_equal,
+ lttng_action_start_session_destroy);
+
+end:
+ return action;
+}
+
+enum lttng_action_status lttng_action_start_session_set_session_name(
+ struct lttng_action *action, const char *session_name)
+{
+ struct lttng_action_start_session *action_start_session;
+ enum lttng_action_status status;
+
+ if (!action || !IS_START_SESSION_ACTION(action) || !session_name ||
+ strlen(session_name) == 0) {
+ status = LTTNG_ACTION_STATUS_INVALID;
+ goto end;
+ }
+
+ action_start_session = action_start_session_from_action(action);
+
+ free(action_start_session->session_name);
+
+ action_start_session->session_name = strdup(session_name);
+ if (!action_start_session->session_name) {
+ status = LTTNG_ACTION_STATUS_ERROR;
+ goto end;
+ }
+
+ status = LTTNG_ACTION_STATUS_OK;
+end:
+ return status;
+}
+
+enum lttng_action_status lttng_action_start_session_get_session_name(
+ const struct lttng_action *action, const char **session_name)
+{
+ const struct lttng_action_start_session *action_start_session;
+ enum lttng_action_status status;
+
+ if (!action || !IS_START_SESSION_ACTION(action) || !session_name) {
+ status = LTTNG_ACTION_STATUS_INVALID;
+ goto end;
+ }
+
+ action_start_session = action_start_session_from_action_const(action);
+
+ *session_name = action_start_session->session_name;
+
+ status = LTTNG_ACTION_STATUS_OK;
+end:
+ return status;
+}
projects / lttng-tools.git / commitdiff
