What does errno 108 (ESHUTDOWN) mean?

ESHUTDOWN

ESHUTDOWN indicates that a send was attempted after the transport endpoint had been shut down for transmission. Linux documents shutdown(fd, SHUT_WR) and shutdown(fd, SHUT_RDWR) as operations that disallow further sends. The error should therefore be treated as a socket-state failure: this endpoint cannot carry the requested outbound data in its current lifetime.

The errno does not by itself prove who initiated the transition or whether a peer already processed earlier application data. Keep it distinct from ECONNRESET, which reports a reset by the peer, and from EPIPE, which send-style calls can use when a connection is no longer writable. Correct recovery usually creates or obtains a fresh connection; it should not simply clear a local “connected” flag and reuse the shutdown endpoint.

State to preserve in logs

• Every local call to shutdown() or close(), including its direction and owning component.
• The ordering of write tasks, cancellation, destructor activity, and completion callbacks around the failed send.
• Whether the application protocol has an acknowledgement or idempotency rule before a queued message is retried on a replacement connection.
• The socket type and transport, because shutdown and error reporting semantics differ across protocols and platforms.

Linux shutdown(2) · Linux errno(3) · Linux UAPI errno definitions

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