errno 61 (ENODATA): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a nonblocking STREAMS-style read or message request found no available data.

Could be also:
Constant	Type	OS
ERROR_PRINTQ_FULL	Win32 error	Windows
ECONNREFUSED	errno	Mac
ENODATA	errno	Solaris
INTERRUPT_EXCEPTION_NOT_HANDLED	BugCheck Code	Windows

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ENODATA

ENODATA is retained in Linux for compatibility with interfaces that use the traditional STREAMS distinction between “no data available” and other I/O failures. It is different from a permanent end-of-file condition and from a missing filesystem object.

For modern Linux code, first identify the compatibility layer or library that returned the value. Preserve whether the call was nonblocking, whether a message queue or stream head was involved, and whether the layer also reports readiness through poll(), select(), or epoll.

Distinguish from

EAGAIN or EWOULDBLOCK: the common Linux result for a would-block nonblocking operation.
ENOENT: a named object does not exist.
EPIPE: a pipe or stream endpoint has been closed for writing.

Linux errno(3) · Linux UAPI errno definitions

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