What does errno 86 (ESTRPIPE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a STREAMS pipe operation hit a compatibility-layer stream state problem.

Could be also:
Constant	Type	OS
ERROR_INVALID_PASSWORD	Win32 error	Windows
EBADARCH	errno	Mac
ELIBMAX	errno	Solaris
INSTRUCTION_COHERENCY_EXCEPTION	BugCheck Code	Windows

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ELIBSCN	EBADARCH

ESTRPIPE

ESTRPIPE is another STREAMS compatibility errno retained by Linux. The name should not be read as the ordinary Linux pipe error. For a normal pipe or FIFO, closed endpoints are typically diagnosed with EPIPE, ENXIO, or readiness events, depending on the operation.

If this code appears, look for ported System V STREAMS logic or a library that maps an internal stream-pipe condition to Linux errno values. The useful evidence is the abstraction that returned it, not just the numeric errno.

Do not confuse with

EPIPE: write on a pipe or socket whose reader is gone.
ESPIPE: illegal seek on a non-seekable object.
ENOSTR: operation expected a stream but did not receive one.

Linux errno(3) · Linux UAPI errno definitions

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