Commit-ID: f87ce7c43f36d4abff91b19edadd23939f99ff98 Gitweb: https://git.kernel.org/tip/f87ce7c43f36d4abff91b19edadd23939f99ff98 Author: Tzvetomir Stoyanov <tstoya...@vmware.com> AuthorDate: Fri, 30 Nov 2018 23:08:11 -0500 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Tue, 8 Jan 2019 13:28:13 -0300
tools lib traceevent: Changed return logic of tep_register_event_handler() API 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 <tstoya...@vmware.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Jiri Olsa <jo...@redhat.com> Cc: Namhyung Kim <namhy...@kernel.org> Link: http://lkml.kernel.org/r/20181201040852.628034...@goodmis.org Signed-off-by: Steven Rostedt (VMware) <rost...@goodmis.org> Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- 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 a850342baf86..54d94054eef0 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -6632,6 +6632,12 @@ 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, @@ -6649,7 +6655,7 @@ 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. */ @@ -6679,7 +6685,7 @@ 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);
