What does errno 70 (ECOMM) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a legacy send path reported a communication error below the caller.

Could be also:
Constant	Type	OS
ERROR_SHARING_PAUSED	Win32 error	Windows
ESTALE	errno	Mac
ECOMM	errno	Solaris
DEREF_UNKNOWN_LOGON_SESSION	BugCheck Code	Windows

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ESRMNT	ESTALE

ECOMM

ECOMM means “Communication error on send”. It is an older errno value kept by Linux for compatibility and for subsystems that want a send-side communication failure distinct from the common socket errors.

Do not collapse it blindly into ECONNRESET or EPIPE. Preserve the transport, device, protocol, peer state, and whether the send operation had already queued any data. The layer that maps the lower failure to ECOMM is usually more informative than the errno string alone.

Distinguish from

EPIPE: the local process wrote after the peer or reader disappeared.
ECONNRESET: the peer reset the connection.
ENOBUFS: output buffer resources were exhausted.
EREMOTEIO: remote I/O failed after reaching the remote side.

Linux errno(3) · Linux UAPI errno definitions

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