static void sighandler(int);
static void daemonize(void);
static void cleanup(void);
+static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm);
static int check_existing_daemon(void);
static int notify_apps(const char*);
static int connect_app(pid_t);
static int init_daemon_socket(void);
-static struct lttcomm_lttng_msg *process_client_msg(struct lttcomm_session_msg*);
+static int process_client_msg(int sock, struct lttcomm_session_msg*);
+static int send_unix_sock(int sock, void *buf, size_t len);
static void *thread_manage_clients(void *);
static void *thread_manage_apps(void *);
static int apps_socket;
static struct ltt_session *current_session;
-static int session_count;
+
+/* Number of element for the list below. */
+static unsigned int session_count;
+static unsigned int traceable_app_count;
/* Init session's list */
static struct ltt_session_list ltt_session_list = {
.head = CDS_LIST_HEAD_INIT(ltt_session_list.head),
};
+/* Init ust traceabl application's list */
static struct ltt_traceable_app_list ltt_traceable_app_list = {
.head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head),
};
lta->pid = reg_msg.pid;
lta->uid = reg_msg.uid;
cds_list_add(<a->list, <t_traceable_app_list.head);
+ traceable_app_count++;
} 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--;
+ }
break;
}
}
{
int sock, ret;
struct lttcomm_session_msg lsm;
- struct lttcomm_lttng_msg *llm;
ret = lttcomm_listen_unix_sock(client_socket);
if (ret < 0) {
}
/* This function dispatch the work to the LTTng or UST libs
- * and make sure that the reply structure (llm) is filled.
- */
- llm = process_client_msg(&lsm);
-
- /* Having a valid lttcomm_lttng_msg struct, reply is sent back
- * to the client directly.
+ * and then sends back the response to the client. This is needed
+ * because there might be more then one lttcomm_lttng_msg to
+ * send out so process_client_msg do both jobs.
*/
- if (llm != NULL) {
- ret = lttcomm_send_unix_sock(sock, llm,
- sizeof(struct lttcomm_lttng_msg));
- free(llm);
- if (ret < 0) {
- continue;
- }
- } else {
- /* The lttcomm_lttng_msg struct was not allocated
- * correctly. Fatal error since the daemon is not able
- * to respond. However, we still permit client connection.
- *
- * TODO: We should have a default llm that tells the client
- * that the sessiond had a fatal error and thus the client could
- * take action to restart ltt-sessiond or inform someone.
- */
+ ret = process_client_msg(sock, &lsm);
+ if (ret < 0) {
+ /* Error detected but still accept command */
+ continue;
}
}
return NULL;
}
+/*
+ * send_unix_sock
+ *
+ * Send data on a unix socket using the liblttsessiondcomm API.
+ *
+ * Return lttcomm error code.
+ */
+static int send_unix_sock(int sock, void *buf, size_t len)
+{
+ /* Check valid length */
+ if (len <= 0) {
+ return -1;
+ }
+
+ return lttcomm_send_unix_sock(sock, buf, len);
+}
+
/*
* connect_app
*
*
* Return size of the array.
*/
-static size_t ust_list_apps(pid_t *pids)
+static size_t ust_list_apps(pid_t **pids)
{
size_t size = 0;
struct ltt_traceable_app *iter = NULL;
+ pid_t *p;
- cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) {
- if (size >= MAX_APPS_PID) {
- break;
- }
+ if (traceable_app_count == 0) {
+ /* No dynamic allocation is done */
+ goto end;
+ }
+
+ p = malloc(sizeof(pid_t) * traceable_app_count);
- pids[size] = iter->pid;
+ /* TODO: Mutex needed to access this list */
+ cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) {
+ p[size] = iter->pid;
size++;
}
+ *pids = p;
+
+end:
return size;
}
+/*
+ * copy_common_data
+ *
+ * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg
+ */
+static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm)
+{
+ llm->cmd_type = lsm->cmd_type;
+ llm->pid = lsm->pid;
+ if (!uuid_is_null(lsm->session_id)) {
+ uuid_copy(llm->session_id, lsm->session_id);
+ }
+ strncpy(llm->trace_name, lsm->trace_name, sizeof(llm->trace_name));
+}
+
/*
* process_client_msg
*
* This takes the lttcomm_session_msg struct and process the command requested
- * by the client. It then creates the reply by allocating a lttcomm_lttng_msg
- * and fill it with the necessary information.
+ * by the client. It then creates response(s) and send it back to the
+ * given socket (sock).
*
- * It's the caller responsability to free that structure when done with it.
- *
- * Return pointer to lttcomm_lttng_msg allocated struct.
+ * Return any error encountered or 0 for success.
*/
-static struct lttcomm_lttng_msg *process_client_msg(struct lttcomm_session_msg *lsm)
+static int process_client_msg(int sock, struct lttcomm_session_msg *lsm)
{
- struct lttcomm_lttng_msg *llm;
-
- /* Allocate the reply message structure */
- llm = malloc(sizeof(struct lttcomm_lttng_msg));
- if (llm == NULL) {
- perror("malloc");
- goto end;
- }
+ int ret;
+ struct lttcomm_lttng_msg llm;
/* Copy common data to identify the response
* on the lttng client side.
*/
- llm->cmd_type = lsm->cmd_type;
- llm->pid = lsm->pid;
- if (!uuid_is_null(lsm->session_id)) {
- uuid_copy(llm->session_id, lsm->session_id);
- }
- strncpy(llm->trace_name, lsm->trace_name, sizeof(llm->trace_name));
+ copy_common_data(&llm, lsm);
/* Default return code.
- * In a our world, everything is OK... right?
+ * In our world, everything is OK... right? ;)
*/
- llm->ret_code = LTTCOMM_OK;
+ llm.ret_code = LTTCOMM_OK;
/* Process by command type */
switch (lsm->cmd_type) {
case UST_LIST_APPS:
{
- llm->u.list_apps.size = ust_list_apps(llm->u.list_apps.pids);
+ pid_t *pids;
+ llm.num_pckt = ust_list_apps(&pids);
+ if (llm.num_pckt == 0) {
+ ret = LTTCOMM_NO_APPS;
+ goto error;
+ }
+
+ /* Send all packets */
+ while (llm.num_pckt != 0) {
+ llm.u.list_apps.pid = pids[traceable_app_count - llm.num_pckt];
+ ret = send_unix_sock(sock, (void*) &llm, sizeof(llm));
+ if (ret < 0) {
+ goto send_error;
+ }
+ llm.num_pckt--;
+ }
+ /* Allocated array by ust_list_apps() */
+ free(pids);
+
break;
}
default:
+ {
/* Undefined command */
- llm->ret_code = LTTCOMM_UND;
+ ret = LTTCOMM_UND;
break;
+ }
}
-end:
- return llm;
+ return 0;
+
+send_error:
+ return ret;
+
+error:
+ /* Notify client of error */
+ llm.ret_code = ret;
+ send_unix_sock(sock, (void*) &llm, sizeof(llm));
+
+ return -1;
}
/*
projects / lttng-tools.git / blobdiff