To alert the telnet server that it needs to unblock callers associated with the dying process, the kernel sends the telnet server the IOCTL_PSL_NOTIFY IOCTL.

• 为了警告telnet服务器它需要开启与即将死亡的进程相关联的调用方,内核会向telnet服务器发送IOCTL_PSL_NOTIFY IOCTL。