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