Function sync_file_range

pub unsafe fn sync_file_range(
    fd: i32,
    offset: isize,
    nbytes: isize,
    flags: i32,
) -> Result<(), i32> 

Available on crate feature dep_nc only.

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());