linux-kernel - Re: [V2 PATCH] selftests: watchdog: Add gettimeout and get|set pretimeout

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Date:   Wed, 26 Sep 2018 13:47:25 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     Jerry.Hoemann@....com
Cc:     erosca@...adit-jv.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>
Subject: Re: [V2 PATCH] selftests: watchdog: Add gettimeout and get|set
 pretimeout

On 09/26/2018 10:29 AM, Jerry Hoemann wrote:
> On Tue, Sep 25, 2018 at 02:51:15PM -0600, Shuah Khan wrote:
>> Hi Jerry,
>>
>> On 09/24/2018 01:36 PM, Jerry Hoemann wrote:
>>>  	{"disable",             no_argument, NULL, 'd'},
>>> @@ -27,6 +27,9 @@
>>>  	{"help",                no_argument, NULL, 'h'},
>>>  	{"pingrate",      required_argument, NULL, 'p'},
>>>  	{"timeout",       required_argument, NULL, 't'},
>>> +	{"gettimeout",          no_argument, NULL, 'T'},
>>> +	{"pretimeout",    required_argument, NULL, 'n'},
>>> +	{"getpretimeout",       no_argument, NULL, 'N'},
>>>  	{NULL,                  no_argument, NULL, 0x0}
>>>  };
>>>  
>>> @@ -71,9 +74,13 @@ static void usage(char *progname)
>>>  	printf(" -h, --help          Print the help message\n");
>>>  	printf(" -p, --pingrate=P    Set ping rate to P seconds (default %d)\n", DEFAULT_PING_RATE);
>>>  	printf(" -t, --timeout=T     Set timeout to T seconds\n");
>>> +	printf(" -T, --gettimeout    Get the timeout\n");
>>> +	printf(" -n, --pretimeout=T  Set the pretimeout to T seconds\n");
>>> +	printf(" -N, --getpretimeout Get the pretimeout\n");
>>>  	printf("\n");
>>>  	printf("Parameters are parsed left-to-right in real-time.\n");
>>>  	printf("Example: %s -d -t 10 -p 5 -e\n", progname);
>>> +	printf("Example: %s -t 12 -T -n 7 -N\n", progname);
>>
>> Would this work the way you want it though, since -N now is oneshot?
>> Should this be just "printf("Example: %s -t 12 -T -n 7\n", progname); ??
> 
> 
> Example shows how to set/query the timers to make sure value set was what
> was intended.
> 
> Note: "oneshot" is a bit of a misnomer as it causes clean exit before
> going into the keep alive loop, but one can still specify multiple
> options.
> 
> 
>>
>> The rest looks good to me.

I spoke too soon. I ran your patch on softdog and error messages in unsupported
cases could you refinement. Please see below:

Sorry for not catching this earlier.

>>
>>>  }
>>>  
>>>  int main(int argc, char *argv[])
>>> @@ -135,6 +142,30 @@ int main(int argc, char *argv[])
>>>  			else
>>>  				printf("WDIOC_SETTIMEOUT errno '%s'\n", strerror(errno));
>>>  			break;
>>> +		case 'T':
>>> +			oneshot = 1;
>>> +			ret = ioctl(fd, WDIOC_GETTIMEOUT, &flags);
>>> +			if (!ret)
>>> +				printf("WDIOC_GETTIMEOUT returns %u seconds.\n", flags);
>>> +			else
>>> +				printf("WDIOC_GETTIMEOUT errno '%s'\n", strerror(errno));

Either remove "errno" or change it to "error '%s'"

>>> +			break;
>>> +		case 'n':
>>> +			flags = strtoul(optarg, NULL, 0);
>>> +			ret = ioctl(fd, WDIOC_SETPRETIMEOUT, &flags);
>>> +			if (!ret)
>>> +				printf("Watchdog pretimeout set to %u seconds.\n", flags);
>>> +			else
>>> +				printf("WDIOC_SETPRETIMEOUT errno '%s'\n", strerror(errno));

Same as above.

>>> +			break;
>>> +		case 'N':
>>> +			oneshot = 1;
>>> +			ret = ioctl(fd, WDIOC_GETPRETIMEOUT, &flags);
>>> +			if (!ret)
>>> +				printf("WDIOC_GETPRETIMEOUT returns %u seconds.\n", flags);
>>> +			else
>>> +				printf("WDIOC_GETPRETIMEOUT errno '%s'\n", strerror(errno));

Same as above.

>>> +			break;
>>>  		default:
>>>  			usage(argv[0]);
>>>  			goto end;
>>>
>>

thanks,
-- Shuah