8 int getopt(int, char * const [], const char *);
10 extern int optind, opterr, optopt;
21 int getopt_long(int, char *const *, const char *, const struct option *, int *);
22 int getopt_long_only(int, char *const *, const char *, const struct option *, int *);
25 #define required_argument 1
26 #define optional_argument 2