| Value | Meaning |
|---|---|
| UNKNOWN_OPTION0 | An option was not known to the parser. This error will only be reported, if the parser hasn't been instructed to ignore unknown options, see OptionContext.setIgnoreUnknownOptions. |
| BAD_VALUE1 | A value couldn't be parsed. |
| FAILED2 | A GOptionArgFunc callback failed. |
Error codes returned by option parsing.