What does errno 94 (EUSERS) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: Solaris uses this value for UFS user-limit or quota-style conditions.

Could be also:
Constant	Type	OS
ESOCKTNOSUPPORT	errno	Linux
EBADMSG	errno	Mac
OBJECT_INITIALIZATION_FAILED	BugCheck Code	Windows

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EBADMSG	EOPNOTSUPP

EUSERS

Ufs user-limit compatibility code

On Solaris, EUSERS is errno value 94. The base message is Too many users (for UFS), but the useful diagnostic context is narrower than the short message: Solaris uses this value for UFS user-limit or quota-style conditions.

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 failing path is on UFS or an older compatibility layer.
Collect filesystem type and quota/resource-control state.
Modern applications should not assume this code appears for generic login-user limits.

References

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