linux-kernel - Re: [PATCH] plugin python: Adjust the handling after PyRun

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Date:   Thu, 27 Apr 2017 21:57:39 +0900
From:   Taeung Song <treeze.taeung@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] plugin python: Adjust the handling after PyRun_String()
 failed



On 04/27/2017 08:30 PM, Steven Rostedt wrote:
> On Thu, 27 Apr 2017 11:52:14 +0900
> Taeung Song <treeze.taeung@...il.com> wrote:
>
>> On 04/27/2017 11:47 AM, Steven Rostedt wrote:
>>> On Thu, 27 Apr 2017 08:46:21 +0900
>>> Taeung Song <treeze.taeung@...il.com> wrote:
>>>
>>>> Even though PyRun_String() failed,
>>>> just 0 will be returned but we need to return -1
>>>> that means error status, so fix it.
>>>>
>>>> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
>>>> ---
>>>>  plugin_python.c | 5 +++--
>>>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/plugin_python.c b/plugin_python.c
>>>> index 2997679..dcfad0f 100644
>>>> --- a/plugin_python.c
>>>> +++ b/plugin_python.c
>>>> @@ -24,7 +24,7 @@ static int load_plugin(struct pevent *pevent, const char *path,
>>>>  			const char *name, void *data)
>>>>  {
>>>>  	PyObject *globals = data;
>>>> -	int err;
>>>> +	int err, ret = 0;
>>>
>>> Hmm, we can either reuse err.
>>>
>>
>> But return value of asprintf() can be more 1,
>> when it succeeded.
>> So I think it is better the below you said.
>
> What I meant was to simply reset err = 0; and set it if we failed and
> returned that. No need to add more variables.
>

I understood ! :)

>>
>>>>  	int len = strlen(path) + strlen(name) + 2;
>>>>  	int nlen = strlen(name) + 1;
>>>>  	char *full = malloc(len);
>>>> @@ -50,12 +50,13 @@ static int load_plugin(struct pevent *pevent, const char *path,
>>>>  	if (!res) {
>>>>  		fprintf(stderr, "failed loading %s\n", full);
>>>>  		PyErr_Print();
>>>> +		ret = -1;
>>>>  	} else
>>>>  		Py_DECREF(res);
>>>>
>>>>  	free(load);
>>>>
>>>> -	return 0;
>>>> +	return ret;
>>>
>>> or do a: return res ? 0 : -1;
>>>
>>> -- Steve
>>>
>>
>> Okey! I'll resent the patch after modifying this!
>
> But this is fine as well.
>
> -- Steve
>

Thank you !!
Have a nice day :)

Taeung