check if mandatory contexts are enabled

Signed-off-by: Julien Desfossez <julien.desfossez@efficios.com>

diff --git a/src/lttngtop.c b/src/lttngtop.c
index 52f0046bd63f4e3cdc74a021a4cc9d20da4f19ee..f659b52e182bf14f28bf3fe8a6b1b4b800ab07a7 100644 (file)
--- a/src/lttngtop.c
+++ b/src/lttngtop.c
@@ -548,6 +548,106 @@ error:
        return ret;
 }
 
+int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
+               int field_cnt, int *tid_check, int *pid_check,
+               int *procname_check, int *ppid_check)
+{
+       int j;
+
+       for (j = 0; j < field_cnt; j++) {
+               if (*tid_check == 0) {
+                       if (strncmp(bt_ctf_get_decl_field_name(field_list[j]), "tid", 3) == 0) {
+                               (*tid_check)++;
+                       }
+               }
+               if (*pid_check == 0) {
+                       if (strncmp(bt_ctf_get_decl_field_name(field_list[j]), "pid", 3) == 0)
+                               (*pid_check)++;
+               }
+               if (*ppid_check == 0) {
+                       if (strncmp(bt_ctf_get_decl_field_name(field_list[j]), "ppid", 4) == 0)
+                               (*ppid_check)++;
+               }
+               if (*procname_check == 0) {
+                       if (strncmp(bt_ctf_get_decl_field_name(field_list[j]), "procname", 8) == 0)
+                               (*procname_check)++;
+               }
+       }
+       /* if all checks are OK, no need to continue the checks */
+       if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
+                       *procname_check == 1)
+               return 0;
+
+       return -1;
+}
+
+/*
+ * check_requirements: check if the required context informations are available
+ *
+ * If each mandatory context information is available for at least in one
+ * event, return 0 otherwise return -1.
+ * Also, we make here a list for all the perf counters available during the
+ * trace.
+ */
+int check_requirements(struct bt_context *ctx)
+{
+       unsigned int i, evt_cnt, field_cnt;
+       struct bt_ctf_event_decl *const * evt_list;
+       const struct bt_ctf_field_decl *const * field_list;
+       int tid_check = 0;
+       int pid_check = 0;
+       int procname_check = 0;
+       int ppid_check = 0;
+       int ret = 0;
+
+       bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
+       for (i = 0; i < evt_cnt; i++) {
+               bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
+                               &field_list, &field_cnt);
+               ret = check_field_requirements(field_list, field_cnt,
+                               &tid_check, &pid_check, &procname_check,
+                               &ppid_check);
+               if (ret == 0)
+                       goto end;
+
+               bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
+                               &field_list, &field_cnt);
+               ret = check_field_requirements(field_list, field_cnt,
+                               &tid_check, &pid_check, &procname_check,
+                               &ppid_check);
+               if (ret == 0)
+                       goto end;
+
+               bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
+                               &field_list, &field_cnt);
+               ret = check_field_requirements(field_list, field_cnt,
+                               &tid_check, &pid_check, &procname_check,
+                               &ppid_check);
+               if (ret == 0)
+                       goto end;
+       }
+
+       if (tid_check == 0) {
+               ret = -1;
+               fprintf(stderr, "[error] missing tid context information\n");
+       }
+       if (pid_check == 0) {
+               ret = -1;
+               fprintf(stderr, "[error] missing pid context information\n");
+       }
+       if (ppid_check == 0) {
+               ret = -1;
+               fprintf(stderr, "[error] missing ppid context information\n");
+       }
+       if (procname_check == 0) {
+               ret = -1;
+               fprintf(stderr, "[error] missing procname context information\n");
+       }
+
+end:
+       return ret;
+}
+
 int main(int argc, char **argv)
 {
        int ret;
@@ -567,7 +667,13 @@ int main(int argc, char **argv)
        bt_ctx = bt_context_create();
        ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
        if (ret < 0) {
-               printf("[error] Opening the trace\n");
+               fprintf(stderr, "[error] Opening the trace\n");
+               goto end;
+       }
+
+       ret = check_requirements(bt_ctx);
+       if (ret < 0) {
+               fprintf(stderr, "[error] missing mandatory context informations\n");
                goto end;
        }