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//! This example shows how to run an NBD server
//! (nbdkit) as a subprocess of libnbd.
fn main() -> libnbd::Result<()> {
// Create the libnbd handle.
let handle = libnbd::Handle::new()?;
// Run nbdkit as a subprocess.
let args = [
"nbdkit",
// You must use ‘-s’ (which tells nbdkit to serve
// a single connection on stdin/stdout).
"-s",
// It is recommended to use ‘--exit-with-parent’
// to ensure nbdkit is always cleaned up even
// if the main program crashes.
"--exit-with-parent",
// Use this to enable nbdkit debugging.
"-v",
// The nbdkit plugin name - this is a RAM disk.
"memory",
"size=1M",
];
handle.connect_command(&args)?;
// Write some random data to the first sector.
let wbuf: Vec<u8> = (0..512).into_iter().map(|i| (i % 13) as u8).collect();
handle.pwrite(&wbuf, 0, None)?;
// Read the first sector back.
let mut rbuf = [0; 512];
handle.pread(&mut rbuf, 0, None)?;
// What was read must be exactly the same as what was written.
assert_eq!(wbuf.as_slice(), rbuf.as_slice());
Ok(())
}
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