Function raise 

#[unsafe(no_mangle)]
pub extern "C" fn raise(sig: c_int) -> c_int

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/raise.html.

Sends the signal sig to the executing thread or process. If a signal handler is called, this function shall not return until after the signal handler does.

Upon success, returns 0. Upon failure, returns a non-zero value and sets errno to indicate the error.