What does errno 58 (ESHUTDOWN) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a send was attempted after the socket had been shut down for that direction.

Could be also:
Constant	Type	OS
ERROR_BAD_NET_RESP	Win32 error	Windows
EDEADLOCK	errno	Linux
EOWNERDEAD	errno	Solaris
SYSTEM_UNWIND_PREVIOUS_USER	BugCheck Code	Windows

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EDEADLOCK	EOWNERDEAD

ESHUTDOWN

The application closed this direction of the connection

ESHUTDOWN means that a send operation was attempted after the socket had already been shut down for sending. shutdown() changes the permitted receive and send directions without closing the file descriptor itself, so a live descriptor does not imply that both directions remain usable.

This is a local lifecycle error. It should be distinguished from a remote graceful close, which affects receive behavior, and from a reset, which discards connection state rather than intentionally disabling a selected direction.

How to make the transition observable

Record the shutdown() call, its how value, the connection identifier, and any queued writes that existed at that moment.
Make writers observe the same state transition before they enqueue data. Otherwise a later worker can report ESHUTDOWN long after the source of the close is no longer visible.
Keep close() and shutdown() semantically separate in logs: the POSIX file descriptor remains open after a successful shutdown.

Recovery depends on protocol semantics

Opening a new connection may be appropriate, but it does not make the old socket writable again. First decide whether queued data was intentionally abandoned, fully transmitted, or requires an application-level replay rule.

References

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