53 lines · c
1// SPDX-License-Identifier: GPL-2.02#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 14int 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/events30 */31bool 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