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

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Date:   Thu, 27 Apr 2017 07:30:33 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Taeung Song <treeze.taeung@...il.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] plugin python: Adjust the handling after PyRun_String()
 failed

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.

> 
> >>  	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