What does errno 94 (EUSERS) in Solaris mean?

EUSERS

Ufs user-limit compatibility code

EUSERS is Solaris errno 94 (Too many users (for UFS)). Solaris uses this value for UFS user-limit or quota-style conditions.

Identify the UFS operation and the user or quota domain associated with the failure. Because this is a compatibility-style limit result, confirm the actual filesystem quota or user-count condition before changing unrelated process limits.

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