What does errno 59 (ETOOMANYREFS) mean?

 
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ETOOMANYREFS

This page examines too many references for a Darwin socket splice-style operation. The networking path could not create another reference required by the operation.

Meaning on this platform

Darwin BSD system-call handling: Too many references for a darwin socket splice-style operation belongs to Darwin errno and should be decoded with the exact SDK or XNU header used by the target. Darwin extensions and legacy STREAMS names related to too many references for a Darwin socket splice-style operation can differ in availability or numbering on other UNIX-like systems. Within Darwin BSD system-call handling, the wording attached to ETOOMANYREFS is a clue to the original interface, not proof that a similarly named modern subsystem returned it.

Darwin assigns platform-specific meanings and numbers to several non-POSIX errno symbols in an investigation of too many references for a Darwin socket splice-style operation. Do not decode the integer with a Linux table or assume the same symbol is produced by the same API on another OS for the too many references for a Darwin socket splice-style operation case.

Facts that identify the owner

EvidenceQuestion it answers
Socket family/type, reference or queued-right count, process limits, peer, and lifecycle trace.Ties too many references for a Darwin socket splice-style operation to one live API object instead of a translated message.
Darwin errno value and the SDK/XNU header version used to decode it when diagnosing too many references for a Darwin socket splice-style operation.Shows whether too many references for a Darwin socket splice-style operation arose in the caller ABI, wrapper, or provider.
First syscall/ioctl return plus process, thread, and object generation in an investigation of too many references for a Darwin socket splice-style operation.Preserves the first boundary before errno can be overwritten for too many references for a Darwin socket splice-style operation.
Known-good object of the same class on the same macOS build for the too many references for a Darwin socket splice-style operation case.Provides a same-platform known-good comparison for too many references for a Darwin socket splice-style operation.

Capture errno immediately after the failing call that produced too many references for a Darwin socket splice-style operation, before formatting, tracing, allocation, or cleanup code runs. For too many references for a Darwin socket splice-style operation, retain the function return value as well because many C interfaces signal failure there and use errno only as secondary detail.

Verification sequence

  1. Close one controlled duplicate/reference and repeat once. Repeat the original operation after the control so the result remains relevant to too many references for a Darwin socket splice-style operation.
  2. Capture errno immediately and compare the paired return value when diagnosing too many references for a Darwin socket splice-style operation. Keep the binary, header ABI, and provider fixed while testing too many references for a Darwin socket splice-style operation.
  3. Repeat with one controlled object while keeping identity and sandbox unchanged in an investigation of too many references for a Darwin socket splice-style operation. Record whether the control reaches the same syscall or runtime boundary as too many references for a Darwin socket splice-style operation.

Cross-platform caution

Tempting assumptionSafer interpretation
The English phrase is assumed to be portabletoo many references for a Darwin socket splice-style operation belongs to Darwin BSD system-call handling; verify the target headers and returning API before applying another platform's errno table
A retry succeeded and erased the original evidenceThe retry can replace too many references for a Darwin socket splice-style operation with a different state; preserve the first call, numeric value, and object generation beforehand

If a wrapper converts too many references for a Darwin socket splice-style operation to an exception or Boolean, instrument below that wrapper. For too many references for a Darwin socket splice-style operation, the decisive record is the syscall, ioctl, CRT function, or compatibility entry point that first exposed the value.

A narrow remedy

Targeted correction. Release leaked socket references and bound concurrency; do not treat it as a generic open-file limit without evidence.

Regression proof. Reference count returns after close and the operation remains stable at expected concurrency. Verify one supported boundary case and one deliberate negative case so handling of too many references for a Darwin socket splice-style operation remains explicit.

Technical references

These owner-maintained or standards-based sources define the namespace and subsystem contract needed to verify Darwin BSD system-call handling ETOOMANYREFS on the deployed platform version.

  • Apple XNU: errno.h — defines the status namespace used for too many references for a Darwin socket splice-style operation.
  • Apple: intro(2) system-call errors — documents the API or lifecycle boundary behind too many references for a Darwin socket splice-style operation.
  • Apple OSS: XNU source — provides ABI, implementation, or protocol context for too many references for a Darwin socket splice-style operation.
  • The Open Group: errno.h — supports the portability and verification limits for too many references for a Darwin socket splice-style operation.

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