Emergency Shutdown for Windows.
Emergency Shutdown powers off the system almost immediately without notifying other applications, which may cause instability and data loss.
Usage: EmergencyShutdown [/r | /s] [/t seconds]
/r : Reboot the system
/s : Shutdown the system
/t seconds : Set a countdown before executing (default 0)
This program will shutdown or reboot the system immediately by
calling the NtShutdownSystem function without notifying other
applications, which may cause instability and data loss.
Rename the executable to ShutdownImmediatelyDangerously.exe or RebootImmediatelyDangerously.exe and run it will shutdown or reboot the system immediately.
Many of the Nt/Zw functions inside the Windows kernel are documented, but some are not. The NtShutdownSystem function is documented pretty well here at NTInternals. The NtSetSystemPowerState function, however, is not.
At the final stages of the Windows shutdown process, NtShutdownSystem is called. It is responsible for shutting down all drivers, flushing Registry hives and the disc cache, clearing the page file, etc. After doing so, it calls the NtSetSystemPowerState function.
NtSetSystemPowerState then causes all plug-and-play devices to be shut down and the system to be either halted, powered off, or rebooted.
However, calling these two functions without notifying the system first is extremely dangerous, and may cause instability in the system.
There're reports saying that NtSetSystemPowerState does not work in some cases, so this program will use NtShutdownSystem instead.