Function nc::fdatasync

pub fn fdatasync(fd: i32) -> Result<(), Errno>

Flush all modified in-core data (exclude metadata) refered by fd to disk.

let path = "/tmp/nc-fdatasync";
let ret = nc::open(path, nc::O_WRONLY | nc::O_CREAT, 0o644);
assert!(ret.is_ok());
let fd = ret.unwrap();
let msg = b"Hello, Rust";
let ret = nc::write(fd, msg.as_ptr() as usize, msg.len());
assert!(ret.is_ok());
assert_eq!(ret, Ok(msg.len() as nc::ssize_t));
assert!(nc::close(fd).is_ok());
assert!(nc::unlink(path).is_ok());