2.6.15 Return information about the process
This is a multipurpose function to return a variety of information.
The value of what specifies the kind of information returned:
- Return the version of the program.
- Return the process id of the process.
- Return the name of the socket used to connect the agent.
- Return the name of the socket used for SSH connections. If SSH support
has not been enabled the error
GPG_ERR_NO_DATA will be returned.