Function inject_restart_handler 

pub fn inject_restart_handler(handler: fn(ExitCode))

Injects a handler that can restart the system.

The function may be called only once; subsequent calls take no effect.

Note that, depending on the specific architecture, OSTD may already have a built-in handler. If so, calling this function outside of OSTD will never take effect. Currently, it happens in

• x86_64: Never;
• riscv64: Always;
• loongarch64: Never.