What does errno 43 (ENOCSI) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: No CSI structure available

Could be also:
Constant	Type	OS
KERN_RPC_SERVER_TERMINATED	Kern return	Mac
ippStsWaterfall	Intel Ipp Status	Any
EIDRM	errno	Linux
EPROTONOSUPPORT	errno	Mac
PANIC_STACK_SWITCH	BugCheck Code	Windows

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EPROTONOSUPPORT	ECHRNG

ENOCSI

CSI is not defined as a current POSIX resource

ENOCSI is errno 43 in illumos and is listed by Oracle as No CSI structure available. The current Solaris errno catalog gives no general system-call scenario for the code, and POSIX Issue 8 does not include ENOCSI.

The acronym alone is insufficient to infer a modern subsystem. A previous generic page grouped this value with unrelated channel and exchange errors. The technically safe interpretation is narrower: a legacy producer expected a CSI structure and could not obtain one; that producer's source or interface documentation must define the structure and its lifetime.

Evidence needed for ENOCSI

Locate the code path that returns errno 43 and identify the structure type it calls CSI.
Inspect allocation, lookup, and teardown of that structure rather than assuming a filesystem or socket resource limit.
When decoding historical data, record the OS/version and header set because numeric errno assignments can change across environments.

References

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