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Diffstat (limited to 'tools/perf/util/print-events.c')
-rw-r--r--tools/perf/util/print-events.c50
1 files changed, 39 insertions, 11 deletions
diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c
index 62e9ea7dcf40..ee145cec42c0 100644
--- a/tools/perf/util/print-events.c
+++ b/tools/perf/util/print-events.c
@@ -4,7 +4,9 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <fcntl.h>
#include <sys/param.h>
+#include <unistd.h>
#include <api/fs/tracing_path.h>
#include <linux/stddef.h>
@@ -56,7 +58,18 @@ static const struct event_symbol event_symbols_tool[PERF_TOOL_MAX] = {
/*
* Print the events from <debugfs_mount_point>/tracing/events
*/
-void print_tracepoint_events(const struct print_callbacks *print_cb, void *print_state)
+void print_tracepoint_events(const struct print_callbacks *print_cb __maybe_unused, void *print_state __maybe_unused)
+{
+ char *events_path = get_tracing_file("events");
+ int events_fd = open(events_path, O_PATH);
+
+ put_tracing_file(events_path);
+ if (events_fd < 0) {
+ printf("Error: failed to open tracing events directory\n");
+ return;
+ }
+
+#ifdef HAVE_SCANDIRAT_SUPPORT
{
struct dirent **sys_namelist = NULL;
int sys_items = tracing_events__scandir_alphasort(&sys_namelist);
@@ -64,30 +77,34 @@ void print_tracepoint_events(const struct print_callbacks *print_cb, void *print
for (int i = 0; i < sys_items; i++) {
struct dirent *sys_dirent = sys_namelist[i];
struct dirent **evt_namelist = NULL;
- char *dir_path;
+ int dir_fd;
int evt_items;
if (sys_dirent->d_type != DT_DIR ||
!strcmp(sys_dirent->d_name, ".") ||
!strcmp(sys_dirent->d_name, ".."))
- continue;
+ goto next_sys;
- dir_path = get_events_file(sys_dirent->d_name);
- if (!dir_path)
- continue;
+ dir_fd = openat(events_fd, sys_dirent->d_name, O_PATH);
+ if (dir_fd < 0)
+ goto next_sys;
- evt_items = scandir(dir_path, &evt_namelist, NULL, alphasort);
+ evt_items = scandirat(events_fd, sys_dirent->d_name, &evt_namelist, NULL, alphasort);
for (int j = 0; j < evt_items; j++) {
struct dirent *evt_dirent = evt_namelist[j];
char evt_path[MAXPATHLEN];
+ int evt_fd;
if (evt_dirent->d_type != DT_DIR ||
!strcmp(evt_dirent->d_name, ".") ||
!strcmp(evt_dirent->d_name, ".."))
- continue;
+ goto next_evt;
- if (tp_event_has_id(dir_path, evt_dirent) != 0)
- continue;
+ snprintf(evt_path, sizeof(evt_path), "%s/id", evt_dirent->d_name);
+ evt_fd = openat(dir_fd, evt_path, O_RDONLY);
+ if (evt_fd < 0)
+ goto next_evt;
+ close(evt_fd);
snprintf(evt_path, MAXPATHLEN, "%s:%s",
sys_dirent->d_name, evt_dirent->d_name);
@@ -102,12 +119,23 @@ void print_tracepoint_events(const struct print_callbacks *print_cb, void *print
/*desc=*/NULL,
/*long_desc=*/NULL,
/*encoding_desc=*/NULL);
+next_evt:
+ free(evt_namelist[j]);
}
- free(dir_path);
+ close(dir_fd);
free(evt_namelist);
+next_sys:
+ free(sys_namelist[i]);
}
+
free(sys_namelist);
}
+#else
+ printf("\nWARNING: Your libc doesn't have the scandirat function, please ask its maintainers to implement it.\n"
+ " As a rough fallback, please do 'ls %s' to see the available tracepoint events.\n", events_path);
+#endif
+ close(events_fd);
+}
void print_sdt_events(const struct print_callbacks *print_cb, void *print_state)
{