Function sigsetjmp 

pub unsafe extern "C" fn sigsetjmp(
    jb: *mut JmpBuf,
    save_mask: i32,
) -> i32

Set jump point for a non-local goto.

The return value will be 0 if this is a direct invocation (ie the “first time” sigsetjmp is executed), and will be the value passed to siglongjmp otherwise.

See sigsetjmp for more information.