1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
/// Sync a file segment with disk.
///
/// # Examples
///
/// ```
/// let path = "/tmp/nc-sync-file-range2";
/// 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 flags = 0;
/// let ret = unsafe {
/// nc::sync_file_range2(
/// fd,
/// flags,
/// 0,
/// n_write,
/// )
/// };
/// 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_range2(
fd: i32,
flags: i32,
offset: loff_t,
nbytes: loff_t,
) -> Result<(), Errno> {
let fd = fd as usize;
let flags = flags as usize;
let offset = offset as usize;
let nbytes = nbytes as usize;
syscall4(SYS_SYNC_FILE_RANGE2, fd, flags, offset, nbytes).map(drop)
}