Function lseek64 

pub fn lseek64<Fd: AsFd>(
    fd: Fd,
    offset: off64_t,
    whence: Whence,
) -> Result<off64_t>

Available on crate feature fs only.

Move the read/write file offset.

Unlike lseek, it takes a 64-bit argument even on platforms where libc::off_t is 32 bits.