file.c

			ast_stopstream(c);
			break;
		}
		if (ms < 0)
			ms = 1000;
		if (!cmdfd) {
			res = ast_waitfor(c, ms);
			if (res < 0) {
				ast_log(LOG_WARNING, "Select failed (%s)\n", strerror(errno));
				return res;
			}
		} else {
			int outfd;
			struct ast_channel *rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
			if (!rchan && (outfd < 0) && (ms)) {
				/* Continue */
				if (errno == EINTR)
					continue;
				ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
				return -1;
			} else if (outfd > -1) { /* this requires cmdfd set */
				/* The FD we were watching has something waiting */
				return 1;
			}
			/* if rchan is set, it is 'c' */
			res = rchan ? 1 : 0; /* map into 'res' values */
		}
		if (res > 0) {
			struct ast_frame *fr = ast_read(c);
			if (!fr)
				return -1;
			switch(fr->frametype) {
			case AST_FRAME_DTMF:
				if (context) {
					const char exten[2] = { fr->subclass, '\0' };
					if (ast_exists_extension(c, context, exten, 1, c->cid.cid_num)) {
						ast_frfree(fr);
						return res;
					}
				} else {
					res = fr->subclass;
					if (strchr(forward,res)) {
						ast_stream_fastforward(c->stream, skip_ms);
					} else if (strchr(rewind,res)) {
						ast_stream_rewind(c->stream, skip_ms);
					} else if (strchr(breakon, res)) {
						ast_frfree(fr);
						return res;
					}					
				}
				break;
			case AST_FRAME_CONTROL:
				switch(fr->subclass) {
				case AST_CONTROL_HANGUP:
					ast_frfree(fr);
					return -1;
				case AST_CONTROL_RINGING:
				case AST_CONTROL_ANSWER:
				case AST_CONTROL_VIDUPDATE:
					/* Unimportant */
					break;
				default:
					ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", fr->subclass);
				}
			case AST_FRAME_VOICE:
				/* Write audio if appropriate */
				if (audiofd > -1)
					write(audiofd, fr->data, fr->datalen);
			}
			/* Ignore all others */
			ast_frfree(fr);
		}
		ast_sched_runq(c->sched);
	}
	return (c->_softhangup ? -1 : 0);
}

int ast_waitstream_fr(struct ast_channel *c, const char *breakon, const char *forward, const char *rewind, int ms)
{
	return waitstream_core(c, breakon, forward, rewind, ms,
		-1 /* no audiofd */, -1 /* no cmdfd */, NULL /* no context */);
}

int ast_waitstream(struct ast_channel *c, const char *breakon)
{
	return waitstream_core(c, breakon, NULL, NULL, 0, -1, -1, NULL);
}

int ast_waitstream_full(struct ast_channel *c, const char *breakon, int audiofd, int cmdfd)
{
	return waitstream_core(c, breakon, NULL, NULL, 0,
		audiofd, cmdfd, NULL /* no context */);
}

int ast_waitstream_exten(struct ast_channel *c, const char *context)
{
	/* Waitstream, with return in the case of a valid 1 digit extension */
	/* in the current or specified context being pressed */

	if (!context)
		context = c->context;
	return waitstream_core(c, NULL, NULL, NULL, 0,
		-1, -1, context);
}

/*
 * if the file name is non-empty, try to play it.
 * Return 0 if success, -1 if error, digit if interrupted by a digit.
 * If digits == "" then we can simply check for non-zero.
 */
int ast_stream_and_wait(struct ast_channel *chan, const char *file,
	const char *language, const char *digits)
{
        int res = 0;
        if (!ast_strlen_zero(file)) {
                res =  ast_streamfile(chan, file, language);
                if (!res)
                        res = ast_waitstream(chan, digits);
        }
        return res;
} 

static int show_file_formats(int fd, int argc, char *argv[])
{
#define FORMAT "%-10s %-10s %-20s\n"
#define FORMAT2 "%-10s %-10s %-20s\n"
	struct ast_format *f;
	int count_fmt = 0;

	if (argc != 3)
		return RESULT_SHOWUSAGE;
	ast_cli(fd, FORMAT, "Format", "Name", "Extensions");
	        
	if (AST_LIST_LOCK(&formats)) {
		ast_log(LOG_WARNING, "Unable to lock format list\n");
		return -1;
	}

	AST_LIST_TRAVERSE(&formats, f, list) {
		ast_cli(fd, FORMAT2, ast_getformatname(f->format), f->name, f->exts);
		count_fmt++;
	}
	AST_LIST_UNLOCK(&formats);
	ast_cli(fd, "%d file formats registered.\n", count_fmt);
	return RESULT_SUCCESS;
#undef FORMAT
#undef FORMAT2
}

struct ast_cli_entry show_file =
{
	{ "show", "file", "formats" },
	show_file_formats,
	"Displays file formats",
	"Usage: show file formats\n"
	"       displays currently registered file formats (if any)\n"
};

int ast_file_init(void)
{
	ast_cli_register(&show_file);
	return 0;
}