sysctl_set_or_fail
if (sysctl_set_or_fail("/proc/sys/kernel/perf_event_paranoid", perf_paranoid_orig, "0"))
if (sysctl_set_or_fail("/proc/sys/kernel/kptr_restrict", kptr_restrict_orig, "0"))
sysctl_set_or_fail("/proc/sys/kernel/perf_event_paranoid", NULL, perf_paranoid_orig);
sysctl_set_or_fail("/proc/sys/kernel/kptr_restrict", NULL, kptr_restrict_orig);
int sysctl_set_or_fail(const char *sysctl_path, char *old_val, const char *new_val);