Re: [PATCH tracing/kprobes v3 3/7] tracing/kprobes: Rename special variables

[Masami Hiramatsu <mhiramat at redhat dot com>]

Frederic Weisbecker wrote:
> On Mon, Oct 12, 2009 at 05:20:09PM -0400, Masami Hiramatsu wrote:
> > Masami Hiramatsu wrote:
> > > @@ -427,28 +427,17 @@ static int parse_probe_vars(char *arg, struct fetch_func *ff, int is_return)
> > >    	int ret = 0;
> > >    	unsigned long param;
> > >
> > > -	switch (arg[0]) {
> > > -	case 'a':	/* argument */
> > > -		ret = strict_strtoul(arg + 1, 10,&param);
> > > -		if (ret || param>   PARAM_MAX_ARGS)
> > > -			ret = -EINVAL;
> > > -		else {
> > > -			ff->func = fetch_argument;
> > > -			ff->data = (void *)param;
> > > -		}
> > > -		break;
> > > -	case 'r':	/* retval or retaddr */
> > > -		if (is_return&&   arg[1] == 'v') {
> > > +	if (strcmp(arg, "retval") == 0) {
> > > +		if (is_return) {
> > >    			ff->func = fetch_retvalue;
> > >    			ff->data = NULL;
> > >    		} else
> > >    			ret = -EINVAL;
> > > -		break;
> > > -	case 's':	/* stack */
> > > -		if (arg[1] == 'a') {
> > > +	} else if (strncmp(arg, "stack", 5) == 0) {
> > > +		if (arg[5] == '\0') {
> > >    			ff->func = fetch_stack_address;
> > >    			ff->data = NULL;
> > > -		} else {
> > > +		} else if (isdigit(arg[5])) {
> > >    			ret = strict_strtoul(arg + 1, 10,&param);
> >                                               ^^^^^^^ this should be arg + 5.
> >
> > > @@ -456,11 +445,18 @@ static int parse_probe_vars(char *arg, struct fetch_func *ff, int is_return)
> > >    				ff->func = fetch_stack;
> > >    				ff->data = (void *)param;
> > >    			}
> > > +		} else
> > > +			ret = -EINVAL;
> > > +	} else if (strncmp(arg, "arg", 3) == 0&&   isdigit(arg[4])) {
>
>
>
> And this should be isdigit(arg[3]) actually, what you want to test is the
> first character after arg, right?

Right. I'll fix it...


Thank you,

--
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com