What does errno 94 (EUSERS) mean?

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

• Oracle Solaris intro(2): error numbers
• illumos errno.h definitions
• POSIX errno.h

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