read_sysfs_file
int read_sysfs_file(char *debugfs_file, char *result, size_t result_size);
if (!read_sysfs_file(SYSFS_MAX_REQ_BUF_PATH, buf, sizeof(buf))) {
if (read_sysfs_file("bus/event_source/devices/cpu/caps/pmu_name",
FAIL_IF(read_sysfs_file("devices/system/cpu/vulnerabilities/spectre_v2", buf, sizeof(buf)));