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-rw-r--r--tools/perf/util/tracepoint.c56
1 files changed, 22 insertions, 34 deletions
diff --git a/tools/perf/util/tracepoint.c b/tools/perf/util/tracepoint.c
index 92dd8b455b..95377ed5d8 100644
--- a/tools/perf/util/tracepoint.c
+++ b/tools/perf/util/tracepoint.c
@@ -4,10 +4,12 @@
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
+#include <stdlib.h>
#include <sys/param.h>
#include <unistd.h>
#include <api/fs/tracing_path.h>
+#include "fncache.h"
int tp_event_has_id(const char *dir_path, struct dirent *evt_dir)
{
@@ -26,39 +28,25 @@ int tp_event_has_id(const char *dir_path, struct dirent *evt_dir)
/*
* Check whether event is in <debugfs_mount_point>/tracing/events
*/
-int is_valid_tracepoint(const char *event_string)
+bool is_valid_tracepoint(const char *event_string)
{
- DIR *sys_dir, *evt_dir;
- struct dirent *sys_dirent, *evt_dirent;
- char evt_path[MAXPATHLEN];
- char *dir_path;
-
- sys_dir = tracing_events__opendir();
- if (!sys_dir)
- return 0;
-
- for_each_subsystem(sys_dir, sys_dirent) {
- dir_path = get_events_file(sys_dirent->d_name);
- if (!dir_path)
- continue;
- evt_dir = opendir(dir_path);
- if (!evt_dir)
- goto next;
-
- for_each_event(dir_path, evt_dir, evt_dirent) {
- snprintf(evt_path, MAXPATHLEN, "%s:%s",
- sys_dirent->d_name, evt_dirent->d_name);
- if (!strcmp(evt_path, event_string)) {
- closedir(evt_dir);
- put_events_file(dir_path);
- closedir(sys_dir);
- return 1;
- }
- }
- closedir(evt_dir);
-next:
- put_events_file(dir_path);
- }
- closedir(sys_dir);
- return 0;
+ char *dst, *path = malloc(strlen(event_string) + 4); /* Space for "/id\0". */
+ bool have_file = false; /* Conservatively return false if memory allocation failed. */
+ const char *src;
+
+ if (!path)
+ return false;
+
+ /* Copy event_string replacing the ':' with '/'. */
+ for (src = event_string, dst = path; *src; src++, dst++)
+ *dst = (*src == ':') ? '/' : *src;
+ /* Add "/id\0". */
+ memcpy(dst, "/id", 4);
+
+ dst = get_events_file(path);
+ if (dst)
+ have_file = file_available(dst);
+ free(dst);
+ free(path);
+ return have_file;
}