WSA_E_CANCELLED - 10111 (0x277F)

Technical Background

The WSA_E_CANCELLED error is a specific error code in the Windows Sockets API, indicating that an operation was canceled due to an attempt to end it while it was still processing. This error typically occurs when a call to WSALookupServiceEnd is made before the associated lookup service call has completed.

Error Details

• Error Name: WSA_E_CANCELLED
• Numeric Code: 10111 (0x277F)
• Short Description: Indicates that a call to WSALookupServiceEnd was made while the previous call was still processing, resulting in cancellation.

Common Causes

The primary cause of this error is an improper sequence of API calls. Specifically, it occurs when:

1. A lookup service operation (e.g., WSALookupServiceBegin, WSALookupServiceNext) is initiated but not yet completed.
2. An attempt is made to cancel the ongoing operation by calling WSALookupServiceEnd prematurely.

Real-World Context

This error can arise in scenarios where network configuration or service discovery operations are being performed, and the application attempts to terminate these operations before they have finished executing.

Is This Error Critical?

The criticality of this error depends on the context. If the operation is not completed due to cancellation, it may lead to incomplete state changes in the system, potentially affecting network connectivity or service discovery outcomes.

How to Diagnose

To diagnose WSA_E_CANCELLED, follow these steps:

1. Review Operation Context: Ensure that all operations are properly sequenced and completed before attempting to cancel them.
2. Validate Parameters: Verify that the parameters passed to WSALookupServiceBegin and subsequent calls are valid and complete.
3. Confirm Object Types: Ensure that the object types being manipulated (e.g., sockets, service handles) are correctly identified and handled.
4. Verify Input Data: Check for any corrupted or invalid input data that might lead to premature cancellation.
5. Check Limits or Constraints: Confirm that no system limits have been exceeded that could cause such an error.

How to Resolve

To resolve WSA_E_CANCELLED, consider the following steps:

1. Correct Parameter Usage: Ensure that all parameters are correctly set and that operations are completed before attempting to cancel them.
2. Adjust Operation Context: Modify the application logic to ensure proper sequencing of API calls, avoiding premature cancellation.
3. Restore Data: If data corruption is suspected, restore or reinitialize any necessary state.
4. Retry Operation with Valid Inputs: Retry the operation with valid inputs and ensure that all steps are completed before attempting to cancel.

Developer Notes

Developers should be cautious when using WSALookupServiceEnd to avoid premature cancellation of ongoing operations, which can lead to inconsistent states in network configurations or service discovery processes.

Related Errors

• WSAEINPROGRESS (10036): Indicates that a blocking operation is still in progress and cannot be canceled immediately.
• WSAEALREADY (10037): Indicates that the requested operation has already been completed or is not supported by the current state of the socket.

FAQ

Q: What does WSA_E_CANCELLED mean?

A: WSA_E_CANCELLED indicates that a call to WSALookupServiceEnd was made while an associated lookup service operation was still processing, resulting in cancellation.

Q: How can I prevent this error from occurring?

A: Ensure proper sequencing of API calls and complete all necessary operations before attempting to cancel them.

Q: Can this error affect network connectivity or service discovery?

A: Yes, if the operation is not completed due to premature cancellation, it may lead to incomplete state changes in the system, potentially affecting network connectivity or service discovery outcomes.

Summary

WSA_E_CANCELLED is a specific error code indicating that an attempt was made to cancel a lookup service operation while it was still processing. Developers should ensure proper sequencing of API calls and complete all necessary operations before attempting to cancel them to avoid this error.