errno 89 (ENOSYS): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Solaris reports that the requested operation is not applicable or not implemented in this context.

Could be also:
Constant	Type	OS
ERROR_NO_PROC_SLOTS	Win32 error	Windows
EDESTADDRREQ	errno	Linux
ECANCELED	errno	Mac
PINBALL_FILE_SYSTEM	BugCheck Code	Windows

ENOSYS

Missing or inapplicable operation

On Solaris, ENOSYS is errno value 89. The base message is Unsupported file system operation, but the useful diagnostic context is narrower than the short message: solaris reports that the requested operation is not applicable or not implemented in this context.

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

Check whether the syscall, filesystem operation, or compatibility interface exists on the target Solaris version.
Use capability detection and a deliberate fallback path.
Do not retry unless the environment or mounted filesystem changes.

References

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