From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH iproute2/net-next v3]tc: B.W limits can now be specified
 in %.
Date: Fri, 17 Nov 2017 12:54:29 -0800
Message-ID: <20171117125429.39d68251@xeon-e3>
References: <20171117204335.GA17658@gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Cc: netdev@vger.kernel.org, doucette@bu.edu, michel.machado@gmail.com
To: Nishanth Devarajan <ndev2021@gmail.com>
Return-path: <netdev-owner@vger.kernel.org>
Received: from mail-pg0-f46.google.com ([74.125.83.46]:32960 "EHLO
        mail-pg0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1761859AbdKQUyi (ORCPT
        <rfc822;netdev@vger.kernel.org>); Fri, 17 Nov 2017 15:54:38 -0500
Received: by mail-pg0-f46.google.com with SMTP id s75so2794790pgs.0
        for <netdev@vger.kernel.org>; Fri, 17 Nov 2017 12:54:37 -0800 (PST)
In-Reply-To: <20171117204335.GA17658@gmail.com>
Sender: netdev-owner@vger.kernel.org
List-ID: <netdev.vger.kernel.org>

On Sat, 18 Nov 2017 02:13:38 +0530
Nishanth Devarajan <ndev2021@gmail.com> wrote:

> +	result = strtoul(buf, &endp, 0);
> +
> +	if (*endp || buf == endp) {
> +		fprintf(stderr, "value \"%s\" in file %s is not a number\n",
> +			buf, fname);
> +		goto out;
> +	}
> +
> +	if (result == ULONG_MAX && errno == ERANGE) {
> +		fprintf(stderr, "strtoul %s: %s", fname, strerror(errno));
> +		goto out;
> +	}

Since speed value of unknown is represented as "-1" I think you need to
change this API to take signed value (ie use strtol)