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The members of the my_option structure are used as follows:
name
The long option name. This is the --name form of the option, without the leading dashes. For example, if the long option is --user, list it as "user" in the my_option structure.
id
The short (single-letter) option name, or a code value associated with the option if it has no single-letter name. For example, if the short option is -u, list it as 'u' in the my_option structure. For options that have only a long name and no corresponding single-character name, you should make up a set of option code values to be used internally for the short names. The values must be unique and different than all the single-character names. (To satisfy the latter constraint, make the codes greater than 255, the largest possible single-character value. An example of this technique is shown in "Writing Clients That Include SSL Support" section later in this chapter.)
comment
An explanatory string that describes the purpose of the option. This is the text that you want displayed in a help message.
value
This is a gptr (generic pointer) value. It points to the variable where you want the option's argument to be stored. After the options have been processed, you can check that variable to see what the option's value has been set to. If the option takes no argument, value can be NULL. Otherwise, the data type of the variable that's pointed to must be consistent with the value of the var_type member.
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