netdev - Re: [PATCH bpf-next] samples/bpf: xdp

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Date:   Mon, 14 May 2018 17:28:40 +0900
From:   Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next] samples/bpf: xdp_monitor, accept short options



On 5/12/2018 1:31 AM, Jesper Dangaard Brouer wrote:
> On Fri, 11 May 2018 10:37:51 +0900
> Prashant Bhole <bhole_prashant_q7@....ntt.co.jp> wrote:
> 
>> updated optstring accept short options
>>
>> Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
>> ---
>>   samples/bpf/xdp_monitor_user.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/samples/bpf/xdp_monitor_user.c b/samples/bpf/xdp_monitor_user.c
>> index 894bc64c2cac..668511c77aaf 100644
>> --- a/samples/bpf/xdp_monitor_user.c
>> +++ b/samples/bpf/xdp_monitor_user.c
>> @@ -594,7 +594,7 @@ int main(int argc, char **argv)
>>   	snprintf(bpf_obj_file, sizeof(bpf_obj_file), "%s_kern.o", argv[0]);
>>   
>>   	/* Parse commands line args */
>> -	while ((opt = getopt_long(argc, argv, "h",
>> +	while ((opt = getopt_long(argc, argv, "hDSs:",
>>   				  long_options, &longindex)) != -1) {
>>   		switch (opt) {
>>   		case 'D':
> 
> It was actually on purpose that I didn't add the short options,
> in-order to force people use those "self-documenting" long-options when
> they show the usage on public mailing lists or in blog-posts.

Got it.

> 
> If you want these short options, you also have to correct the "usage"
> function that state these are "internal" short-options.

I am submitting v2 with "usage" updated, because with usability point of 
view it is nice to have short options. Thanks.

-Prashant

> 
> Notice the long options parsing done by getopt_long() allow you to only
> specify part of the string.  Al-through, I can see --s is ambiguous.
> 
> $ sudo ./xdp_monitor --s
> ./xdp_monitor: option '--s' is ambiguous; possibilities: '--stats' '--sec'