Just a few questions as an example: * If you write to an NFS-mounted file and write() returns an error, does it mean the block wasn't written to the remote dis

Just a few questions as an example: * If you write to an NFS-mounted file and write() returns an error, does it mean the block wasn't written to the remote disk? * If you write to a TCP socket and write() returns OK, does it mean data was received by your network peer? * UNIX pipes: how many times is your block being copied before it reaches your peer's buffer supplied to read()? And don't get me started on signals.