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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@redhat.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Tzvetomir Stoyanov <tstoyanov@vmware.com>
Subject: [PATCH 4/6] tools/lib/traceevent: Changed return logic of tep_register_event_handler() API
Date: Fri, 30 Nov 2018 23:08:11 -0500
Message-ID: <20181201040852.628034497@goodmis.org> (raw)
In-Reply-To: <20181201040807.154099010@goodmis.org>

From: Tzvetomir Stoyanov <tstoyanov@vmware.com>

In order to make libtraceevent into a proper library, its API
should be straightforward. The tep_register_event_handler()
functions returns -1 in case it successfully registers the
new event handler. Such return code is used by the other library
APIs in case of an error. To unify the return logic of
tep_register_event_handler() with the other APIs, this patch
introduces enum tep_reg_handler, which is used by this function
as return value, to handle all possible successful return cases.

Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 tools/lib/traceevent/event-parse.c | 10 ++++++++--
 tools/lib/traceevent/event-parse.h |  5 +++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index c3d22d0a2935..b3c00d6b524e 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -6631,6 +6631,12 @@ static struct tep_event *search_event(struct tep_handle *pevent, int id,
  *
  * If @id is >= 0, then it is used to find the event.
  * else @sys_name and @event_name are used.
+ *
+ * Returns:
+ *  TEP_REGISTER_SUCCESS_OVERWRITE if an existing handler is overwritten
+ *  TEP_REGISTER_SUCCESS if a new handler is registered successfully
+ *  negative TEP_ERRNO_... in case of an error
+ *
  */
 int tep_register_event_handler(struct tep_handle *pevent, int id,
 			       const char *sys_name, const char *event_name,
@@ -6648,7 +6654,7 @@ int tep_register_event_handler(struct tep_handle *pevent, int id,
 
 	event->handler = func;
 	event->context = context;
-	return 0;
+	return TEP_REGISTER_SUCCESS_OVERWRITE;
 
  not_found:
 	/* Save for later use. */
@@ -6678,7 +6684,7 @@ int tep_register_event_handler(struct tep_handle *pevent, int id,
 	pevent->handlers = handle;
 	handle->context = context;
 
-	return -1;
+	return TEP_REGISTER_SUCCESS;
 }
 
 static int handle_matches(struct event_handler *handler, int id,
diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index 77a4a1dd4b4d..ac377ae99008 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -485,6 +485,11 @@ int tep_print_func_field(struct trace_seq *s, const char *fmt,
 			 struct tep_event *event, const char *name,
 			 struct tep_record *record, int err);
 
+enum tep_reg_handler {
+	TEP_REGISTER_SUCCESS = 0,
+	TEP_REGISTER_SUCCESS_OVERWRITE,
+};
+
 int tep_register_event_handler(struct tep_handle *pevent, int id,
 			       const char *sys_name, const char *event_name,
 			       tep_event_handler_func func, void *context);
-- 
2.19.1



  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-01  4:08 [PATCH 0/6] tools/lib/traceevent: Some more library updates Steven Rostedt
2018-12-01  4:08 ` [PATCH 1/6] tools/lib/traceevent: Initialize host_bigendian at tep_handle allocation Steven Rostedt
2019-01-09  7:13   ` [tip:perf/urgent] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2018-12-01  4:08 ` [PATCH 2/6] tools/lib/traceevent: Rename struct cmdline to struct tep_cmdline Steven Rostedt
2019-01-09  7:13   ` [tip:perf/urgent] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2018-12-01  4:08 ` [PATCH 3/6] tools/lib/traceevent: Changed return logic of trace_seq_printf() and trace_seq_vprintf() APIs Steven Rostedt
2019-01-09  7:14   ` [tip:perf/urgent] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2018-12-01  4:08 ` Steven Rostedt [this message]
2019-01-09  7:15   ` [tip:perf/urgent] tools lib traceevent: Changed return logic of tep_register_event_handler() API tip-bot for Tzvetomir Stoyanov
2018-12-01  4:08 ` [PATCH 5/6] tools/lib/traceevent: Rename tep_is_file_bigendian() to tep_file_bigendian() Steven Rostedt
2019-01-09  7:15   ` [tip:perf/urgent] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2018-12-01  4:08 ` [PATCH 6/6] tools/lib/traceevent: Remove tep_data_event_from_type() API Steven Rostedt
2019-01-09  7:16   ` [tip:perf/urgent] tools lib traceevent: " tip-bot for Tzvetomir Stoyanov
2019-01-07 22:51 ` [PATCH 0/6] tools/lib/traceevent: Some more library updates Steven Rostedt
2019-01-08 13:45 ` Arnaldo Carvalho de Melo

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