logger.c

			int res;
			va_start(ap, fmt);
			res = ast_str_set_va(&buf, BUFSIZ, fmt, ap); /* XXX BUFSIZ ? */
			va_end(ap);
			if (res != AST_DYNSTR_BUILD_FAILED) {
				term_filter_escapes(buf->str);
				fputs(buf->str, stdout);
			}
		}
		return;
	}
	
	/* don't display LOG_DEBUG messages unless option_verbose _or_ option_debug
	   are non-zero; LOG_DEBUG messages can still be displayed if option_debug
	   is zero, if option_verbose is non-zero (this allows for 'level zero'
	   LOG_DEBUG messages to be displayed, if the logmask on any channel
	   allows it)
	*/
	if (!option_verbose && !option_debug && (level == __LOG_DEBUG))
		return;

	/* Ignore anything that never gets logged anywhere */
	if (!(global_logmask & (1 << level)))
		return;
	
	/* Build string */
	va_start(ap, fmt);
	res = ast_str_set_va(&buf, BUFSIZ, fmt, ap);
	va_end(ap);

	/* If the build failed, then abort and free this structure */
	if (res == AST_DYNSTR_BUILD_FAILED)
		return;

	/* Create a new logging message */
	if (!(logmsg = ast_calloc(1, sizeof(*logmsg) + res + 1)))
		return;
	
	/* Copy string over */
	strcpy(logmsg->str, buf->str);

	/* Set type to be normal */
	logmsg->type = LOGMSG_NORMAL;

	/* Create our date/time */
	ast_localtime(&tv, &tm, NULL);
	ast_strftime(logmsg->date, sizeof(logmsg->date), dateformat, &tm);

	/* Copy over data */
	logmsg->level = level;
	logmsg->file = file;
	logmsg->line = line;
	logmsg->function = function;

	/* If the logger thread is active, append it to the tail end of the list - otherwise skip that step */
	if (logthread != AST_PTHREADT_NULL) {
		AST_LIST_LOCK(&logmsgs);
		AST_LIST_INSERT_TAIL(&logmsgs, logmsg, list);
		ast_cond_signal(&logcond);
		AST_LIST_UNLOCK(&logmsgs);
	} else {
		logger_print_normal(logmsg);
		ast_free(logmsg);
	}

	return;
}

void ast_backtrace(void)
{
#ifdef linux
#ifdef AST_DEVMODE
	int count=0, i=0;
	void **addresses;
	char **strings;

	if ((addresses = ast_calloc(MAX_BACKTRACE_FRAMES, sizeof(*addresses)))) {
		count = backtrace(addresses, MAX_BACKTRACE_FRAMES);
		if ((strings = backtrace_symbols(addresses, count))) {
			ast_debug(1, "Got %d backtrace record%c\n", count, count != 1 ? 's' : ' ');
			for (i=0; i < count ; i++) {
#if __WORDSIZE == 32
				ast_log(LOG_DEBUG, "#%d: [%08X] %s\n", i, (unsigned int)addresses[i], strings[i]);
#elif __WORDSIZE == 64
				ast_log(LOG_DEBUG, "#%d: [%016lX] %s\n", i, (unsigned long)addresses[i], strings[i]);
#endif
			}
			free(strings);
		} else {
			ast_debug(1, "Could not allocate memory for backtrace\n");
		}
		ast_free(addresses);
	}
#else
	ast_log(LOG_WARNING, "Must run configure with '--enable-dev-mode' for stack backtraces.\n");
#endif
#else /* ndef linux */
	ast_log(LOG_WARNING, "Inline stack backtraces are only available on the Linux platform.\n");
#endif
}

void ast_verbose(const char *fmt, ...)
{
	struct logmsg *logmsg = NULL;
	struct ast_str *buf = NULL;
	int res = 0;
	va_list ap;

	if (!(buf = ast_str_thread_get(&verbose_buf, VERBOSE_BUF_INIT_SIZE)))
		return;

        if (ast_opt_timestamp) {
                struct timeval tv;
                struct ast_tm tm;
                char date[40];
                char *datefmt;

		tv = ast_tvnow();
                ast_localtime(&tv, &tm, NULL);
                ast_strftime(date, sizeof(date), dateformat, &tm);
                datefmt = alloca(strlen(date) + 3 + strlen(fmt) + 1);
                sprintf(datefmt, "[%s] %s", date, fmt);
                fmt = datefmt;
        }

	/* Build string */
	va_start(ap, fmt);
	res = ast_str_set_va(&buf, 0, fmt, ap);
	va_end(ap);

	/* If the build failed then we can drop this allocated message */
	if (res == AST_DYNSTR_BUILD_FAILED)
		return;

	if (!(logmsg = ast_calloc(1, sizeof(*logmsg) + res + 1)))
		return;

	strcpy(logmsg->str, buf->str);

	ast_log(LOG_VERBOSE, logmsg->str);

	/* Set type */
	logmsg->type = LOGMSG_VERBOSE;
	
	/* Add to the list and poke the thread if possible */
	if (logthread != AST_PTHREADT_NULL) {
		AST_LIST_LOCK(&logmsgs);
		AST_LIST_INSERT_TAIL(&logmsgs, logmsg, list);
		ast_cond_signal(&logcond);
		AST_LIST_UNLOCK(&logmsgs);
	} else {
		logger_print_verbose(logmsg);
		ast_free(logmsg);
	}
}

int ast_register_verbose(void (*v)(const char *string)) 
{
	struct verb *verb;

	if (!(verb = ast_malloc(sizeof(*verb))))
		return -1;

	verb->verboser = v;

	AST_RWLIST_WRLOCK(&verbosers);
	AST_RWLIST_INSERT_HEAD(&verbosers, verb, list);
	AST_RWLIST_UNLOCK(&verbosers);
	
	return 0;
}

int ast_unregister_verbose(void (*v)(const char *string))
{
	struct verb *cur;

	AST_RWLIST_WRLOCK(&verbosers);
	AST_RWLIST_TRAVERSE_SAFE_BEGIN(&verbosers, cur, list) {
		if (cur->verboser == v) {
			AST_RWLIST_REMOVE_CURRENT(list);
			ast_free(cur);
			break;
		}
	}
	AST_RWLIST_TRAVERSE_SAFE_END;
	AST_RWLIST_UNLOCK(&verbosers);
	
	return cur ? 0 : -1;
}