[Libguestfs] [nbdkit PATCH v2 3/6] protocol: Support ESHUTDOWN error

The NBD specification was clarified to state that the server can send ESHUTDOWN at any time that it wants to inform the client that the server is about to close the connection and that all further commands will fail, to give the client a chance to first send NBD_CMD_DISC for a clean shutdown. While nbdkit does not (yet) directly send this errno, it is feasible that a plugin may want this error value preserved across the wire rather than converted to EINVAL. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; --- src/connections.c | 4 ++++ src/protocol.h | 1 + 2 files changed, 5 insertions(+) diff --git a/src/connections.c b/src/connections.c index e15a777..c0f0567 100644 --- a/src/connections.c +++ b/src/connections.c @@ -737,6 +737,10 @@ nbd_errno (int error) case EFBIG: case ENOSPC: return NBD_ENOSPC; +#ifdef ESHUTDOWN + case ESHUTDOWN: + return NBD_ESHUTDOWN; +#endif case EINVAL: default: return NBD_EINVAL; diff --git a/src/protocol.h b/src/protocol.h index 4571a3a..74c4527 100644 --- a/src/protocol.h +++ b/src/protocol.h @@ -145,5 +145,6 @@ struct reply { #define NBD_ENOMEM 12 #define NBD_EINVAL 22 #define NBD_ENOSPC 28 +#define NBD_ESHUTDOWN 108 #endif /* NBDKIT_PROTOCOL_H */ -- 2.9.3