nc 0.9.7

Access system calls directly
Documentation 
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/// Start swapping to file/device.
///
/// # Examples
///
/// ```
/// let filename = "/dev/sda-no-exist";
/// let ret = unsafe { nc::swapon(filename, nc::SWAP_FLAG_PREFER) };
/// assert!(ret.is_err());
/// assert_eq!(ret, Err(nc::EPERM));
/// ```
pub unsafe fn swapon<P: AsRef<Path>>(filename: P, flags: i32) -> Result<(), Errno> {
    let filename = CString::new(filename.as_ref());
    let filename_ptr = filename.as_ptr() as usize;
    let flags = flags as usize;
    syscall2(SYS_SWAPON, filename_ptr, flags).map(drop)
}