linux-kernel - Re: [PATCH 11/13] perf tests: Allow reuse of test

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Date:	Tue, 3 Jun 2014 17:35:05 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 11/13] perf tests: Allow reuse of test_file function

On Tue, Jun 03, 2014 at 07:51:31AM -0600, David Ahern wrote:
> On 6/2/14, 3:18 PM, Jiri Olsa wrote:
> >Making the test_file function to be reusable for
> >new tests coming in following patches.
> >
> >Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> >Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> >Cc: David Ahern <dsahern@...il.com>
> >Cc: Frederic Weisbecker <fweisbec@...il.com>
> >Cc: Ingo Molnar <mingo@...nel.org>
> >Cc: Jean Pihet <jean.pihet@...aro.org>
> >Cc: Namhyung Kim <namhyung@...nel.org>
> >Cc: Paul Mackerras <paulus@...ba.org>
> >Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> >Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> >---
> >  tools/perf/tests/dso-data.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> >diff --git a/tools/perf/tests/dso-data.c b/tools/perf/tests/dso-data.c
> >index 3e6cb17..f5c8743 100644
> >--- a/tools/perf/tests/dso-data.c
> >+++ b/tools/perf/tests/dso-data.c
> >@@ -12,11 +12,15 @@
> >
> >  static char *test_file(int size)
> >  {
> >-	static char buf_templ[] = "/tmp/test-XXXXXX";
> >+#define TEMPL "/tmp/test-XXXXXX"
> 
> use /tmp/perf-test-XXXXXX or /tmp/perf-XXXXXX to we know where all
> these tmp files came from.

ok

> 
> >+	static char buf_templ[sizeof(TEMPL)];
> 
> why static? and ...

I need to use it outside the test_file function

> 
> >  	char *templ = buf_templ;
> >  	int fd, i;
> >  	unsigned char *buf;
> >
> >+	strcpy(buf_templ, TEMPL);
> >+#undef TEMPL
> 
> why the need to change from char buf_templ[] to strcpy?

because it gets overwritten via mkstemp function

thanks,
jirka
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