nc 0.9.7

Access system calls directly
Documentation 
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/// Change I/O privilege level.
///
/// # Examples
///
/// ```
/// let ret = unsafe { nc::iopl(1) };
/// assert!(ret.is_err());
/// assert_eq!(ret, Err(nc::EPERM));
/// ```
pub unsafe fn iopl(level: i32) -> Result<(), Errno> {
    let level = level as usize;
    syscall1(SYS_IOPL, level).map(drop)
}