Add CPU hotplug support

[lttng-tools.git] / ltt-sessiond / session.c

diff --git a/ltt-sessiond/session.c b/ltt-sessiond/session.c
index 5764b71dc61ed4ecfb1f350989a7f9b51df77c14..92111ffed981cc5f2593bc0770efc8c5f8e893aa 100644 (file)
--- a/ltt-sessiond/session.c
+++ b/ltt-sessiond/session.c
@@ -20,6 +20,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #include <urcu/list.h>
 
 #include "lttngerr.h"
@@ -32,7 +33,7 @@ static unsigned int session_count;
 static void add_session_list(struct ltt_session *ls);
 static void del_session_list(struct ltt_session *ls);
 
-/* Init session's list */
+/* Init global session list */
 struct ltt_session_list ltt_session_list = {
        .head = CDS_LIST_HEAD_INIT(ltt_session_list.head),
 };
@@ -82,35 +83,6 @@ static void del_session_list(struct ltt_session *ls)
        }
 }
 
-/*
- *     find_session_by_uuid
- *
- *     Return a ltt_session structure ptr that matches the uuid.
- */
-struct ltt_session *find_session_by_uuid(uuid_t session_id)
-{
-       int found = 0;
-       struct ltt_session *iter;
-
-       /* Sanity check for NULL session_id */
-       if (uuid_is_null(session_id)) {
-               goto end;
-       }
-
-       cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
-               if (uuid_compare(iter->uuid, session_id) == 0) {
-                       found = 1;
-                       break;
-               }
-       }
-
-end:
-       if (!found) {
-               iter = NULL;
-       }
-       return iter;
-}
-
 /*
  *     find_session_by_name
  *
@@ -145,13 +117,13 @@ struct ltt_session *find_session_by_name(char *name)
  *  Return -1 if no session is found.
  *  On success, return 1;
  */
-int destroy_session(uuid_t *uuid)
+int destroy_session(char *name)
 {
        int found = -1;
        struct ltt_session *iter;
 
        cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
-               if (uuid_compare(iter->uuid, *uuid) == 0) {
+               if (strcmp(iter->name, name) == 0) {
                        DBG("Destroying session %s", iter->name);
                        del_session_list(iter);
                        free(iter);
@@ -166,47 +138,70 @@ int destroy_session(uuid_t *uuid)
 /*
  *     create_session
  *
- *     Create a brand new session and add it to the
- *     global session list.
+ *     Create a brand new session and add it to the global session list.
  */
-int create_session(char *name, uuid_t *session_id)
+int create_session(char *name, char *path)
 {
+       int ret;
+       char date_time[NAME_MAX];
        struct ltt_session *new_session;
-
-       DBG("Creating session %s", name);
+       time_t rawtime;
+       struct tm *timeinfo;
 
        new_session = find_session_by_name(name);
        if (new_session != NULL) {
-               goto error;
+               ret = -EEXIST;
+               goto error_exist;
        }
 
        /* Allocate session data structure */
        new_session = malloc(sizeof(struct ltt_session));
        if (new_session == NULL) {
                perror("malloc");
-               goto error_mem;
+               ret = -ENOMEM;
+               goto error_malloc;
        }
 
+       /* Define session name */
        if (name != NULL) {
                if (asprintf(&new_session->name, "%s", name) < 0) {
-                       goto error_mem;
+                       ret = -ENOMEM;
+                       goto error_asprintf;
                }
        } else {
-               /* Generate session name based on the session count */
-               if (asprintf(&new_session->name, "%s%d", "lttng-", session_count) < 0) {
-                       goto error_mem;
-               }
+               ERR("No session name given");
+               ret = -1;
+               goto error;
        }
 
-       /* UUID generation */
-       uuid_generate(new_session->uuid);
-       uuid_copy(*session_id, new_session->uuid);
+       /* Define session system path */
+       if (path != NULL) {
+               if (strstr(name, "auto-") == NULL) {
+                       time(&rawtime);
+                       timeinfo = localtime(&rawtime);
+                       strftime(date_time, sizeof(date_time), "-%Y%m%d-%H%M%S", timeinfo);
+               } else {
+                       date_time[0] = '\0';
+               }
 
-       /* Set consumer (identifier) to 0. This means that there is
+               if (asprintf(&new_session->path, "%s/%s%s", path, name, date_time) < 0) {
+                       ret = -ENOMEM;
+                       goto error_asprintf;
+               }
+       } else {
+               ERR("No session path given");
+               ret = -1;
+               goto error;
+       }
+
+       /*
+        * Set consumer (identifier) to 0. This means that there is
         * NO consumer attach to that session yet.
         */
        new_session->ust_consumer = 0;
-       new_session->kernel_consumer = 0;
+
+       /* Init kernel session */
+       new_session->kernel_session = NULL;
 
        /* Init list */
        CDS_INIT_LIST_HEAD(&new_session->ust_traces);
@@ -217,20 +212,25 @@ int create_session(char *name, uuid_t *session_id)
        /* Add new session to the global session list */
        add_session_list(new_session);
 
+       DBG("Tracing session %s created in %s", name, new_session->path);
+
        return 0;
 
 error:
-       return -1;
+error_asprintf:
+       if (new_session != NULL) {
+               free(new_session);
+       }
 
-error_mem:
-       return -ENOMEM;
+error_exist:
+error_malloc:
+       return ret;
 }
 
 /*
  *  get_lttng_session
  *
- *  Iterate over the global session list and
- *  fill the lttng_session array.
+ *  Iterate over the global session list and fill the lttng_session array.
  */
 void get_lttng_session(struct lttng_session *sessions)
 {
@@ -244,8 +244,8 @@ void get_lttng_session(struct lttng_session *sessions)
         * the control struct in the buffer.
         */
        cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
-               /* Copy name and uuid */
-               uuid_copy(lsess.uuid, iter->uuid);
+               strncpy(lsess.path, iter->path, sizeof(lsess.path));
+               lsess.path[sizeof(lsess.path) - 1] = '\0';
                strncpy(lsess.name, iter->name, sizeof(lsess.name));
                lsess.name[sizeof(lsess.name) - 1] = '\0';
                memcpy(&sessions[i], &lsess, sizeof(lsess));