linux-kernel - Re: [PATCH 01/14] tools lib traceevent: Get rid of malloc_or_die() in show

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Date:	Mon, 9 Dec 2013 14:03:42 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 01/14] tools lib traceevent: Get rid of malloc_or_die()
 in show_error()

On Mon, 9 Dec 2013 15:30:09 -0300
Arnaldo Carvalho de Melo <acme@...stprotocols.net> wrote:


> > +		error = malloc(MAX_ERR_STR_SIZE);
> > +		if (error == NULL) {
> > +			/* no memory */
> > +			*error_str = "failed to allocate memory";
> > +			return;
> 
> Can *error_str point to either malloc'ed or constant strings? Who
> releases the allocated memory?
> 

Good question. Perhaps we should have a flag that states if the string
is allocated or not. Or better yet, since the only reason it would be
pointing to a static string is if the string for error_str itself
failed to allocate. Then we could use a string within pevent for it:

static char *pevent_failed_error_alloc = "failed to allocate memory";

Then in the freeing of error str:

void pevent_free_error_str(error_str)
{
	if (error_str != pevent_failed_error_alloc)
		free(error_str);
}

-- Steve
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