errno 63 (ENOSR): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a STREAMS-style layer could not allocate stream resources for the operation.

Could be also:
Constant	Type	OS
ERROR_PRINT_CANCELLED	Win32 error	Windows
STATUS_WAIT_63	NTSTATUS	Windows
ENAMETOOLONG	errno	Mac
ENOSR	errno	Solaris
NO_MORE_SYSTEM_PTES	BugCheck Code	Windows

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ENOSR

ENOSR means “Out of streams resources”. Linux keeps the value in the generic errno header, but ordinary Linux pipes, sockets, and files do not use the full System V STREAMS model. The value is therefore most meaningful in ported STREAMS code, protocol emulation, or device-specific compatibility layers.

Diagnose it as a resource exhaustion at the stream layer, not as disk space or ordinary memory pressure by default. Preserve the number of open stream-like objects, module pushes, queues, pending messages, and the kernel or library facility that produced the result.

Distinguish from

ENOMEM: generic memory allocation failure.
ENOBUFS: buffer-space exhaustion, often network-related.
EMFILE or ENFILE: file descriptor table limits.

Linux errno(3) · Linux UAPI errno definitions

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