nc 0.9.7

Access system calls directly
Documentation 
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/// Get/set signal stack context.
pub unsafe fn sigaltstack(
    ss: Option<&sigaltstack_t>,
    old_ss: Option<&mut sigaltstack_t>,
) -> Result<(), Errno> {
    let ss_ptr = ss.map_or(core::ptr::null::<sigaltstack_t>() as usize, |ss| {
        ss as *const sigaltstack_t as usize
    });
    let old_ss_ptr = old_ss.map_or(core::ptr::null_mut::<sigaltstack_t>() as usize, |old_ss| {
        old_ss as *mut sigaltstack_t as usize
    });
    syscall2(SYS_SIGALTSTACK, ss_ptr, old_ss_ptr).map(drop)
}