errno 72 (ELOCKUNMAPPED): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Solaris keeps this obsolete robust-lock value for compatibility; modern recovery uses EOWNERDEAD.

Could be also:
Constant	Type	OS
ERROR_REDIR_PAUSED	Win32 error	Windows
EMULTIHOP	errno	Linux
EBADRPC	errno	Mac
CANCEL_STATE_IN_COMPLETED_IRP	BugCheck Code	Windows

ELOCKUNMAPPED

Obsolete robust-lock compatibility code

On Solaris, ELOCKUNMAPPED is errno value 72. The base message is locked lock was unmapped, but the useful diagnostic context is narrower than the short message: solaris keeps this obsolete robust-lock value for compatibility; modern recovery uses EOWNERDEAD.

Use the Solaris-specific errno table first, then compare with POSIX only for portable behavior. Some Solaris values share names with other UNIX systems but have different numbers or more specific historical meanings.

What to check

If old binaries report it, examine robust mutex lifecycle and mappings that disappeared while a lock was held.
For new code, handle EOWNERDEAD and ENOTRECOVERABLE explicitly.
Do not build new logic that depends on ELOCKUNMAPPED being produced by modern interfaces.

References

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