1// SPDX-License-Identifier: GPL-2.0
2#include "tracepoint.h"
3
4#include <errno.h>
5#include <fcntl.h>
6#include <stdio.h>
7#include <sys/param.h>
8#include <unistd.h>
9
10#include <api/fs/tracing_path.h>
11
12int tp_event_has_id(const char *dir_path, struct dirent *evt_dir)
13{
14	char evt_path[MAXPATHLEN];
15	int fd;
16
17	snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path, evt_dir->d_name);
18	fd = open(evt_path, O_RDONLY);
19	if (fd < 0)
20		return -EINVAL;
21	close(fd);
22
23	return 0;
24}
25
26/*
27 * Check whether event is in <debugfs_mount_point>/tracing/events
28 */
29int is_valid_tracepoint(const char *event_string)
30{
31	DIR *sys_dir, *evt_dir;
32	struct dirent *sys_dirent, *evt_dirent;
33	char evt_path[MAXPATHLEN];
34	char *dir_path;
35
36	sys_dir = tracing_events__opendir();
37	if (!sys_dir)
38		return 0;
39
40	for_each_subsystem(sys_dir, sys_dirent) {
41		dir_path = get_events_file(sys_dirent->d_name);
42		if (!dir_path)
43			continue;
44		evt_dir = opendir(dir_path);
45		if (!evt_dir)
46			goto next;
47
48		for_each_event(dir_path, evt_dir, evt_dirent) {
49			snprintf(evt_path, MAXPATHLEN, "%s:%s",
50				 sys_dirent->d_name, evt_dirent->d_name);
51			if (!strcmp(evt_path, event_string)) {
52				closedir(evt_dir);
53				put_events_file(dir_path);
54				closedir(sys_dir);
55				return 1;
56			}
57		}
58		closedir(evt_dir);
59next:
60		put_events_file(dir_path);
61	}
62	closedir(sys_dir);
63	return 0;
64}
65