[1/4] libtraceevent: Add log levels

Commit Message

Tzvetomir Stoyanov (VMware) April 28, 2021, 7:29 a.m. UTC

Defined levels of the library logs and new API to set the desired log
level. By default, only critical logs are enabled.

Signed-off-by: Tzvetomir Stoyanov (VMware) <[e-mail]>
---
 src/event-parse.h | 12 ++++++++++++
 src/parse-utils.c | 16 ++++++++++++++++
 2 files changed, 28 insertions(+)

Patch

diff --git a/src/event-parse.h b/src/event-parse.h
index 05b156b..77be2b9 100644
--- a/src/event-parse.h
+++ b/src/event-parse.h
@@ -749,4 +749,16 @@  int tep_filter_copy(struct tep_event_filter *dest, struct tep_event_filter *sour
 
 int tep_filter_compare(struct tep_event_filter *filter1, struct tep_event_filter *filter2);
 
+/* Control library logs */
+enum tep_loglevel {
+	TEP_LOG_NONE = 0,
+	TEP_LOG_CRITICAL,
+	TEP_LOG_ERROR,
+	TEP_LOG_WARNING,
+	TEP_LOG_INFO,
+	TEP_LOG_DEBUG,
+	TEP_LOG_ALL
+};
+void tep_set_loglevel(enum tep_loglevel level);
+
 #endif /* _PARSE_EVENTS_H */
diff --git a/src/parse-utils.c b/src/parse-utils.c
index 6a4a2cd..bc89c44 100644
--- a/src/parse-utils.c
+++ b/src/parse-utils.c
@@ -9,8 +9,21 @@ 
 #include <stdarg.h>
 #include <errno.h>
 
+#include "event-parse.h"
+
 #define __weak __attribute__((weak))
 
+static int log_level = TEP_LOG_CRITICAL;
+
+/**
+ * tep_set_loglevel - set log level of the library
+ * @level: desired level of the library messages
+ */
+void tep_set_loglevel(enum tep_loglevel level)
+{
+	log_level = level;
+}
+
 int __weak tep_vwarning(const char *name, const char *fmt, va_list ap)
 {
 	int ret = errno;
@@ -29,6 +42,9 @@  void __weak tep_warning(const char *fmt, ...)
 {
 	va_list ap;
 
+	if (log_level < TEP_LOG_WARNING)
+		return;
+
 	va_start(ap, fmt);
 	tep_vwarning("libtraceevent", fmt, ap);
 	va_end(ap);