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no_argument (or 0) if the option does not take an argument,63
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required_argument (or 1) if the option requires an argument,64
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optional_argument (or 2) if the option takes an optional argument.65
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If the field `flag' is not NULL, it points to a variable that is set67
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to the value given in the field `val' when the option is found, but68
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left unchanged if the option is not found.69
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To have a long-named option do something other than set an `int' to71
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a compiled-in constant, such as set a value from `optarg', set the72
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option's `flag' field to zero and its `val' field to a nonzero72
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option's `flag' field to zero and its `val' field to a non-zero73
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value (the equivalent single-letter option character, if there is74
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one). For long options that have a zero `flag' field, `getopt'75
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returns the contents of the `val' field. */76
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struct zbx_option78
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{79
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const char *name;80
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/* has_arg can't be an enum because some compilers complain about81
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type mismatches in all the code that assumes it is an int. */82
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int has_arg;