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/// Sync a file segment to disk
///
/// # Examples
///
/// ```
/// let path = "/tmp/nc-sync-file-range";
/// let ret = unsafe { nc::openat(nc::AT_FDCWD, path, nc::O_WRONLY | nc::O_CREAT, 0o644) };
/// assert!(ret.is_ok());
/// let fd = ret.unwrap();
///
/// let msg = b"Hello, Rust";
/// let ret = unsafe { nc::write(fd, msg) };
/// assert!(ret.is_ok());
/// let n_write = ret.unwrap();
/// assert_eq!(n_write, msg.len() as nc::ssize_t);
///
/// let ret = unsafe {
/// nc::sync_file_range(
/// fd,
/// 0,
/// n_write,
/// nc::SYNC_FILE_RANGE_WAIT_BEFORE
/// | nc::SYNC_FILE_RANGE_WRITE
/// | nc::SYNC_FILE_RANGE_WAIT_AFTER,
/// )
/// };
/// assert!(ret.is_ok());
///
/// let ret = unsafe { nc::close(fd) };
/// assert!(ret.is_ok());
/// let ret = unsafe { nc::unlinkat(nc::AT_FDCWD, path, 0) };
/// assert!(ret.is_ok());
/// ```
pub unsafe fn sync_file_range(
fd: i32,
offset: off_t,
nbytes: off_t,
flags: i32,
) -> Result<(), Errno> {
let fd = fd as usize;
let offset = offset as usize;
let nbytes = nbytes as usize;
let flags = flags as usize;
syscall4(SYS_SYNC_FILE_RANGE, fd, offset, nbytes, flags).map(drop)
}