PIDFD_SELF_THREAD_GROUP
#define PIDFD_SELF_PROCESS PIDFD_SELF_THREAD_GROUP
case PIDFD_SELF_THREAD_GROUP:
case PIDFD_SELF_THREAD_GROUP:
#ifndef PIDFD_SELF_THREAD_GROUP
#define PIDFD_SELF_PROCESS PIDFD_SELF_THREAD_GROUP
err = send_signal(PIDFD_SELF_THREAD_GROUP);