== AsteriskSource/CommandLineInterface ==

* version 0.2.0
{{{
struct ast_cli_entry {
        /*! Null terminated list of the words of the command */
        char *cmda[AST_MAX_CMD_LEN];
        /*! Handler for the command (fd for output, # of arguments, argument list).  Returns RESULT_SHOWUSAGE for improper arguments */
        int (*handler)(int fd, int argc, char *argv[]);
        /*! Summary of the command (< 60 characters) */
        char *summary;
        /*! Detailed usage information */
        char *usage;
        /*! Generate a list of possible completions for a given word */
        char *(*generator)(char *line, char *word, int pos, int state);
        /*! For linking */
        struct ast_cli_entry *next;
        /*! For keeping track of usage */
        int inuse;
};
}}}

* int main(int argc, char *argv[])
 * ast_ulaw_init(); ast_alaw_init(); callerid_init(); tdd_init();
 * Check for options
 * term_init();
 * if (ast_tryconnect()) {
  * if (option_remote) {
   * exit(0);
  * } else {
   * exit(1);
  * }
 * } else if (option_remote || option_exec) {
  * Unable to connect to remote asterisk
  * exit(1);
 * }
 * if (!option_verbose && !option_debug && !option_nofork && !option_console) {
  * daemon(0,0);
 * }
 * ast_makesocket();
 * if (option_console || option_verbose || option_remote)
  * ast_register_verbose(console_verboser);
 * init_logger()
 * init_manager()
 * ast_image_init()
 * load_pbx()
 * load_modules()
 * init_framer()
 * ast_cli_register(&astshutdownnow);
 * ast_cli_register(&astshutdowngracefully);
 * ast_cli_register(&astrestartnow);
 * ast_cli_register(&astrestartgracefully);
 * ast_cli_register(&astrestartwhenconvenient);
 * ast_cli_register(&aborthalt);
 * if (option_console) {
  * consolethread = pthread_self();
  * rl_callback_handler_install(tmp, consolehandler);
  * rl_completion_entry_function = (void *)(Function *)cli_generator;
  * for(;;) {
   * res = select(STDIN_FILENO + 1, &rfds, NULL, NULL, NULL);
   * if (res > 0) {
    * rl_callback_read_char();
     * enter key 가 입력되면, consolhandler 을 call 한다.
   * } else if (res < 1) {
    * rl_forced_update_display();
   * }
 * } else {
  * select(0,NULL,NULL,NULL,NULL);
 * }
 * return 0;

* int ast_cli_register(struct ast_cli_entry *e)

* static void consolehandler(char *s)
 * add_history(s);
 * if (s[0] == '!') {
  * shell command 를 수행하거나, shell 을 수행시킨다.
 * } else
  * ast_cli_command(STDOUT_FILENO, s);

* int ast_cli_command(int fd, char *s)
 * struct ast_cli_entry *e;
 * e = find_cli(argv, 0);
 * switch(e->handler(fd, x, argv)) {
 * case RESULT_SHOWUSAGE:
  * ast_cli(fd, e->usage);
 * }

{{{
static struct ast_cli_entry aborthalt = { { "abort", "halt", NULL }, handle_abort_halt, "Cancel a running halt", abort_halt_help };
}}}

* ast_cli_register 에 의해 static 으로 설정된 ast_cli_entry 를 linked list 에 넣는다.

* linked list 에서 해당하는 ast_cli_entry 를 찾아 handler 를 수행한다.

* handler 는 필요에 따라 각 channel, 각 application 등에서 설정한다.