opt
(const char*)
Name of option.
handler
(int (*func) (const char *, const char *, void *))
User-defined handler function to be called when option is set. A
NULL value indicates that no user-defined handler is required.
client_data
(void *)
Pointer to client data. A
NULL value indicates that no client data is required.
var
(void *)
Pointer to variable to set to the value specified on the
command line option.
mode
(long)
Type of variable var. Allowed values
are PL_OPT_FUNC, PL_OPT_BOOL, PL_OPT_INT, PL_OPT_FLOAT,
PL_OPT_STRING.
syntax
(const char *)
Syntax for option (used in the usage message).
desc
(const char *)
Description of the option (used in the usage message).
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