An operation that completes synchronously performs all of its processing in
the function call made by the application. The function returns different values
depending on its success or failure:
- Synchronous Success. If the request or service corresponding to the function has been carried out
successfully, the function returns zero, indicating success. Any values
written as a result of the function call are reliable and can be used immediately.
- Synchronous Failure. If the function detects an error and the request is not carried out, a
negative error number is returned to identify the error.
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