getopt_long(3) Library Functions Manual getopt_long(3) getopt_long - (libc -lc) #define _GNU_SOURCE #include int getopt_long(int argc, char *argv[], const char *optstring, const struct option *longopts, int *longindex); getopt_long() getopt(3) . ( optstring ("") NULL.) . --arg=param --arg param. longopts struct option struct option { const char *name; int has_arg; int *flag; int val; }; : name . has_arg : no_argument ( 0) required_argument ( 1) optional_argument ( 2) . flag . flag NULL getopt_long() val. ( val .) getopt_long() 0 flag val . val flag. . longindex NULL longopts. optopt getopt(3) "argv[(optind - 1)]". getopt(3). getopt_long() . val flag NULL 0 . -1 getopt(3) '?' . getopt(3). attributes(7). +----------------------+------------------------------------+----------+ | | | | +----------------------+------------------------------------+----------+ |getopt_long() | | | | | | | | | | | | | | | | | | (MT-Unsafe) | | | | :getopt | | | | env | +----------------------+------------------------------------+----------+ GNU. getopt_long() . #include #include #include #include int main(int argc, char *argv[]) { int c; int digit_optind = 0; for (;;) { int this_option_optind = optind ? optind : 1; int option_index = 0; static struct option long_options[] = { {"add", required_argument, 0, 0 }, {"append", no_argument, 0, 0 }, {"delete", required_argument, 0, 0 }, {"verbose", no_argument, 0, 0 }, {"create", required_argument, 0, 'c'}, {"file", required_argument, 0, 0 }, {0, 0, 0, 0 } }; c = getopt_long(argc, argv, "abc:d:012", long_options, &option_index); if (c == -1) break; switch (c) { case 0: printf("option %s", long_options[option_index].name); if (optarg) printf(" with arg %s", optarg); printf("\n"); break; case '0': case '1': case '2': if (digit_optind != 0 && digit_optind != this_option_optind) printf("digits occur in two different argv-elements.\n"); digit_optind = this_option_optind; printf("option %c\n", c); break; case 'a': printf("option a\n"); break; case 'b': printf("option b\n"); break; case 'c': printf("option c with value '%s'\n", optarg); break; case 'd': printf("option d with value '%s'\n", optarg); break; case '?': break; default: printf("?? getopt returned character code 0%o ??\n", c); } } if (optind < argc) { printf("non-option ARGV-elements: "); while (optind < argc) printf("%s ", argv[optind++]); printf("\n"); } exit(EXIT_SUCCESS); } getopt(1), getopt(3), getopt_long_only(3), getsubopt(3) 3 . . : . 6.18 14 2026 getopt_long(3)