static int check_existing_daemon(void);
static int notify_apps(const char* name);
static int connect_app(pid_t pid);
+static int find_app_by_pid(pid_t pid);
static int init_daemon_socket(void);
static int process_client_msg(int sock, struct lttcomm_session_msg*);
static int send_unix_sock(int sock, void *buf, size_t len);
static int setup_data_buffer(char **buf, size_t size, struct lttcomm_lttng_msg *llm);
+static void add_traceable_app(struct ltt_traceable_app *lta);
+static void del_traceable_app(struct ltt_traceable_app *lta);
+static void add_session_list(struct ltt_session *ls);
+static void del_session_list(struct ltt_session *ls);
/* Command function */
static void get_list_apps(pid_t *pids);
.head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head),
};
+/* List mutex */
+pthread_mutex_t ltt_traceable_app_list_mutex;
+
/*
* thread_manage_apps
*
lta = malloc(sizeof(struct ltt_traceable_app));
lta->pid = reg_msg.pid;
lta->uid = reg_msg.uid;
- cds_list_add(<a->list, <t_traceable_app_list.head);
- traceable_app_count++;
+ add_traceable_app(lta);
} else {
/* Unregistering */
- lta = NULL;
cds_list_for_each_entry(lta, <t_traceable_app_list.head, list) {
if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) {
- cds_list_del(<a->list);
- /* Check to not overflow here */
- if (traceable_app_count != 0) {
- traceable_app_count--;
- }
+ del_traceable_app(lta);
+ free(lta);
break;
}
}
-
- /* If an item was found, free it from memory */
- if (lta) {
- free(lta);
- }
}
}
* request of the client.
*/
ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm));
- if (ret < 0) {
+ if (ret <= 0) {
continue;
}
return NULL;
}
+/*
+ * add_traceable_app
+ *
+ * Add a traceable application structure to the global
+ * list protected by a mutex.
+ */
+static void add_traceable_app(struct ltt_traceable_app *lta)
+{
+ pthread_mutex_lock(<t_traceable_app_list_mutex);
+ cds_list_add(<a->list, <t_traceable_app_list.head);
+ traceable_app_count++;
+ pthread_mutex_unlock(<t_traceable_app_list_mutex);
+}
+
+/*
+ * del_traceable_app
+ *
+ * Delete a traceable application structure from the
+ * global list protected by a mutex.
+ */
+static void del_traceable_app(struct ltt_traceable_app *lta)
+{
+ pthread_mutex_lock(<t_traceable_app_list_mutex);
+ cds_list_del(<a->list);
+ /* Sanity check */
+ if (traceable_app_count != 0) {
+ traceable_app_count--;
+ }
+ pthread_mutex_unlock(<t_traceable_app_list_mutex);
+}
+
+/*
+ * add_session_list
+ *
+ * Add a ltt_session structure to the global list.
+ */
+static void add_session_list(struct ltt_session *ls)
+{
+ cds_list_add(&ls->list, <t_session_list.head);
+ session_count++;
+}
+
+/*
+ * del_session_list
+ *
+ * Delete a ltt_session structure to the global list.
+ */
+static void del_session_list(struct ltt_session *ls)
+{
+ cds_list_del(&ls->list);
+ /* Sanity check */
+ if (session_count != 0) {
+ session_count--;
+ }
+}
+
/*
* send_unix_sock
*
*
* Return a socket connected to the libust communication socket
* of the application identified by the pid.
+ *
+ * If the pid is not found in the traceable list,
+ * return -1 to indicate error.
*/
static int connect_app(pid_t pid)
{
- int sock;
+ int sock, ret;
+
+ ret = find_app_by_pid(pid);
+ if (ret == 0) {
+ return -1;
+ }
sock = ustctl_connect_pid(pid);
if (sock < 0) {
return ret;
}
+/*
+ * find_app_by_pid
+ *
+ * Iterate over the traceable apps list.
+ * On success, return 1, else return 0
+ */
+static int find_app_by_pid(pid_t pid)
+{
+ struct ltt_traceable_app *iter;
+
+ pthread_mutex_lock(<t_traceable_app_list_mutex);
+ cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) {
+ if (iter->pid == pid) {
+ pthread_mutex_unlock(<t_traceable_app_list_mutex);
+ /* Found */
+ return 1;
+ }
+ }
+ pthread_mutex_unlock(<t_traceable_app_list_mutex);
+
+ return 0;
+}
+
/*
* find_session_by_uuid
*
cds_list_for_each_entry(iter, <t_session_list.head, list) {
if (uuid_compare(iter->uuid, *uuid) == 0) {
- cds_list_del(&iter->list);
+ del_session_list(iter);
free(iter);
- session_count--;
found = 1;
break;
}
CDS_INIT_LIST_HEAD(&new_session->lttng_traces);
/* Add new session to the global session list */
- cds_list_add(&new_session->list, <t_session_list.head);
-
- session_count++;
+ add_session_list(new_session);
return 0;
return -1;
}
+/*
+ * ust_create_trace
+ *
+ * Create an userspace trace using pid.
+ * This trace is then appended to the current session
+ * ust trace list.
+ */
+static int ust_create_trace(pid_t pid)
+{
+ int sock, ret;
+ struct ltt_ust_trace *trace;
+
+ trace = malloc(sizeof(struct ltt_ust_trace));
+ if (trace == NULL) {
+ perror("malloc");
+ ret = -1;
+ goto error;
+ }
+
+ /* Init */
+ trace->pid = pid;
+ trace->shmid = 0;
+
+ /* Connect to app using ustctl API */
+ sock = connect_app(pid);
+ if (sock < 0) {
+ ret = LTTCOMM_NO_TRACEABLE;
+ goto error;
+ }
+
+ ret = ustctl_create_trace(sock, "auto");
+ if (ret < 0) {
+ ret = LTTCOMM_CREATE_FAIL;
+ goto error;
+ }
+
+ /* Check if current session is valid */
+ if (current_session) {
+ cds_list_add(&trace->list, ¤t_session->ust_traces);
+ }
+
+error:
+ return ret;
+}
+
/*
* get_list_apps
*
int i = 0;
struct ltt_traceable_app *iter;
- /* TODO: Mutex needed to access this list */
+ /* Protected by a mutex here because the threads manage_client
+ * and manage_apps can access this list.
+ */
+ pthread_mutex_lock(<t_traceable_app_list_mutex);
cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) {
pids[i] = iter->pid;
i++;
}
+ pthread_mutex_unlock(<t_traceable_app_list_mutex);
}
/*
*/
copy_common_data(&llm, lsm);
+ /* Check command that needs a session */
+ if (lsm->cmd_type != LTTNG_CREATE_SESSION &&
+ lsm->cmd_type != LTTNG_LIST_SESSIONS &&
+ lsm->cmd_type != UST_LIST_APPS)
+ {
+ current_session = find_session_by_uuid(lsm->session_id);
+ if (current_session == NULL) {
+ ret = LTTCOMM_SELECT_SESS;
+ goto end;
+ }
+ }
+
+
/* Default return code.
* In our world, everything is OK... right? ;)
*/
/* No auxiliary data so only send the llm struct. */
goto end;
}
+ case UST_CREATE_TRACE:
+ {
+ ret = ust_create_trace(lsm->pid);
+ if (ret < 0) {
+ ret = LTTCOMM_CREATE_FAIL;
+ goto end;
+ }
+
+ /* No auxiliary data so only send the llm struct. */
+ goto end;
+ }
case UST_LIST_APPS:
{
/* Stop right now if no apps */
{
switch (sig) {
case SIGPIPE:
+ return;
case SIGINT:
case SIGTERM:
cleanup();
projects / lttng-tools.git / blobdiff