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ETIME
This page examines UCRT compatibility status: operation timer expired. The Microsoft runtime returned its POSIX-supplement errno value, which should be interpreted in the documented CRT call rather than confused with ETIMEDOUT or WAIT_TIMEOUT.
Meaning on this platform
Microsoft C runtime compatibility: Ucrt compatibility status: operation timer expired is exposed by the Microsoft CRT compatibility layer. _doserrno and the immediately preceding CRT call can preserve the Win32 or runtime condition summarized by errno. The wording attached to this errno is a clue to the original interface, not proof that a similarly named modern subsystem returned it.
Facts that identify the owner
| Evidence | Question it answers |
|---|---|
| CRT call, configured timer, elapsed time, errno/_doserrno, cancellation, and completion state. | Ties this error to one live API object instead of a translated message. |
| Thread-local errno captured before another CRT call changes it. | Shows whether this error arose in the caller ABI, wrapper, or provider. |
| Paired Win32 handle/socket state and the actual CRT descriptor conversion. | Preserves the first boundary before errno can be overwritten. |
| Known-good call using the same UCRT build and calling convention. | Provides a same-platform known-good comparison. |
Verification sequence
- Run with one short and one adequate documented timeout. Repeat the original operation after the control so the result remains relevant to this error.
- Log errno with _get_errno and _doserrno at the immediate failure site. Keep the binary, header ABI, and provider fixed.
- Verify the numeric value against the target UCRT header rather than a Unix table. Record whether the control reaches the same syscall or runtime boundary as this error.
Two observations are especially discriminating here: CRT call, configured timer, elapsed time, errno/_doserrno, cancellation, and completion state. Use this control for comparison: run with one short and one adequate documented timeout.
Cross-platform caution
| Tempting assumption | Safer interpretation |
|---|---|
| The English phrase is assumed to be portable | ETIME belongs to Microsoft C runtime compatibility; verify the target headers and returning API before applying another platform's errno table |
| A retry succeeded and erased the original evidence | A retry can replace the original errno with a different state; preserve the first call, numeric value, and object generation beforehand |
A narrow remedy
Targeted correction. Repair completion signaling or set a justified timeout while preserving cancellation and partial-result rules.
Regression proof. The operation completes or expires at the configured boundary without duplicate work.
Technical references
Use Microsoft C runtime documentation for this compatibility errno on the deployed platform version.
- Microsoft: errno constants — defines the status namespace used.
- Microsoft: _get_errno — documents the API or lifecycle boundary behind this error.
- Microsoft: _doserrno and errno — provides ABI, implementation, or protocol context.
- The Open Group: errno.h — supports the portability and verification limits.
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