| 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 <stdlib.h> |
| 8 | #include <sys/param.h> |
| 9 | #include <unistd.h> |
| 10 | |
| 11 | #include <api/fs/tracing_path.h> |
| 12 | #include "fncache.h" |
| 13 | |
| 14 | int tp_event_has_id(const char *dir_path, struct dirent *evt_dir) |
| 15 | { |
| 16 | char evt_path[MAXPATHLEN]; |
| 17 | int fd; |
| 18 | |
| 19 | snprintf(evt_path, MAXPATHLEN, "%s/%s/id" , dir_path, evt_dir->d_name); |
| 20 | fd = open(evt_path, O_RDONLY); |
| 21 | if (fd < 0) |
| 22 | return -EINVAL; |
| 23 | close(fd); |
| 24 | |
| 25 | return 0; |
| 26 | } |
| 27 | |
| 28 | /* |
| 29 | * Check whether event is in <debugfs_mount_point>/tracing/events |
| 30 | */ |
| 31 | bool is_valid_tracepoint(const char *event_string) |
| 32 | { |
| 33 | char *dst, *path = malloc(strlen(event_string) + 4); /* Space for "/id\0". */ |
| 34 | bool have_file = false; /* Conservatively return false if memory allocation failed. */ |
| 35 | const char *src; |
| 36 | |
| 37 | if (!path) |
| 38 | return false; |
| 39 | |
| 40 | /* Copy event_string replacing the ':' with '/'. */ |
| 41 | for (src = event_string, dst = path; *src; src++, dst++) |
| 42 | *dst = (*src == ':') ? '/' : *src; |
| 43 | /* Add "/id\0". */ |
| 44 | memcpy(dst, "/id" , 4); |
| 45 | |
| 46 | dst = get_events_file(path); |
| 47 | if (dst) |
| 48 | have_file = file_available(dst); |
| 49 | free(dst); |
| 50 | free(path); |
| 51 | return have_file; |
| 52 | } |
| 53 | |