Function nc::readahead

pub unsafe fn readahead(
    fd: i32,
    offset: off_t,
    count: size_t
) -> Result<(), Errno>

Initialize file head into page cache.

Example

let path = "/etc/passwd";
let ret = unsafe { nc::openat(nc::AT_FDCWD, path, nc::O_RDONLY, 0) };
let fd = ret.unwrap();
let ret = unsafe { nc::readahead(fd, 0, 64) };
assert!(ret.is_ok());
let ret = unsafe { nc::close(fd) };
assert!(ret.is_ok());