Lib lttng-ctl data available command support

[lttng-tools.git] / include / lttng / lttng.h

diff --git a/include/lttng/lttng.h b/include/lttng/lttng.h
index d421ca518987fb506916fd02359ba9eef06bf63e..4171cde41c998d123fac3b407a337ec622b42cfe 100644 (file)
--- a/include/lttng/lttng.h
+++ b/include/lttng/lttng.h
@@ -19,24 +19,25 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#ifndef _LTTNG_H
-#define _LTTNG_H
+#ifndef LTTNG_H
+#define LTTNG_H
 
 #include <limits.h>
 #include <stdint.h>
 #include <sys/types.h>
 
+/* Error codes that can be returned by API calls */
+#include <lttng/lttng-error.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*
  * Event symbol length. Copied from LTTng kernel ABI.
  */
 #define LTTNG_SYMBOL_NAME_LEN             256
 
-/*
- * Maximum length of a domain name. This is the limit for the total length of a
- * domain name specified by the RFC 1035 (https://www.ietf.org/rfc/rfc1035.txt)
- */
-#define LTTNG_MAX_DNNAME                  255
-
 /*
  * Every lttng_event_* structure both apply to kernel event and user-space
  * event.
@@ -124,6 +125,7 @@ enum lttng_event_context_type {
        LTTNG_EVENT_CONTEXT_PPID              = 8,
        LTTNG_EVENT_CONTEXT_VPPID             = 9,
        LTTNG_EVENT_CONTEXT_PTHREAD_ID        = 10,
+       LTTNG_EVENT_CONTEXT_HOSTNAME          = 11,
 };
 
 enum lttng_calibrate_type {
@@ -259,6 +261,7 @@ struct lttng_event_field {
        enum lttng_event_field_type type;
        char padding[LTTNG_EVENT_FIELD_PADDING];
        struct lttng_event event;
+       int nowrite;
 };
 
 /*
@@ -578,4 +581,18 @@ extern int lttng_disable_consumer(struct lttng_handle *handle);
  */
 extern int lttng_health_check(enum lttng_health_component c);
 
-#endif /* _LTTNG_H */
+/*
+ * For a given session name, this call checks if the data is ready to be read
+ * or is still being extracted by the consumer(s) hence not ready to be used by
+ * any readers.
+ *
+ * Return 0 if the data is _NOT_ available else 1 if the data is ready. On
+ * error, a negative value is returned and readable by lttng_strerror().
+ */
+extern int lttng_data_available(const char *session_name);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LTTNG_H */