What does errno 53 (ENOANO) mean?

ENOANO

A name preserved without a current POSIX contract

ENOANO is defined as errno 53 in the historical convergent-error range of illumos sys/errno.h. The header comment says no anode. The current Oracle Solaris errno catalog no longer lists this symbolic name at value 53, where it documents ENOKEY instead, and POSIX does not define ENOANO.

That mismatch makes version and producer identification essential. A binary table or compatibility component can expose a legacy Solaris/System V number even when current Solaris documentation assigns the same number differently. Numeric value 53 by itself is therefore insufficient evidence for the symbolic name.

Version-sensitive decoding

• Record both the numeric value and the symbolic constant compiled into the program or SDK.
• Check the actual errno.h used at build time before decoding archived telemetry.
• Avoid converting ENOANO into a filesystem inode diagnosis; the legacy header says “anode”, but the originating interface must define that object.

References

• Oracle Solaris intro(2) errno catalog
• illumos sys/errno.h ABI definitions
• POSIX Issue 8 errno.h

Looking for a different code? Search another status or error code.