Function readahead

pub unsafe fn readahead(fd: i32, offset: isize, count: usize) -> Result<(), i32> 

Available on crate feature dep_nc only.

Initialize file head into page cache.

Examples

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());