What does errno 87 (EUSERS) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: a legacy layer reports that its configured user or session limit is exhausted.

Could be also:
Constant	Type	OS
ERROR_INVALID_PARAMETER	Win32 error	Windows
ESHLIBVERS	errno	Mac
ELIBEXEC	errno	Solaris
XNS_INTERNAL_ERROR	BugCheck Code	Windows

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ELIBMAX	ESHLIBVERS

EUSERS

EUSERS means “Too many users”. In Linux it is a legacy errno value and should not automatically be equated with the current number of logged-in accounts. It can appear when a subsystem or compatibility layer enforces its own user, session, license, or remote-client limit.

Preserve the facility that returned it and the limit it enforces. The fix may be to close sessions, raise a subsystem-specific maximum, or correct stale registrations; adding Unix user accounts or changing file permissions is usually unrelated.

Compare with

EMFILE: per-process descriptor limit reached.
ENFILE: system-wide file object limit reached.
EAGAIN: temporary resource exhaustion for the requested operation.
EDQUOT: filesystem quota exceeded.

Linux errno(3) · Linux UAPI errno definitions

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