linux-kernel - Re: [PATCH 22/48] perf tools: Add perf_data_file_

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Date:	Wed, 24 Feb 2016 15:34:44 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	Alexei Starovoitov <ast@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Brendan Gregg <brendan.d.gregg@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Cody P Schafer <dev@...yps.com>,
	"David S. Miller" <davem@...emloft.net>,
	He Kuang <hekuang@...wei.com>,
	Jérémie Galarneau 
	<jeremie.galarneau@...icios.com>, Jiri Olsa <jolsa@...nel.org>,
	Kirill Smelkov <kirr@...edi.com>,
	Li Zefan <lizefan@...wei.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>, pi3orama@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 22/48] perf tools: Add perf_data_file__switch() helper

On Mon, Feb 22, 2016 at 09:10:49AM +0000, Wang Nan wrote:
> perf_data_file__switch() closes current output file, renames it, then
> open a new one to continue record. It will be used by perf record
> to split output into multiple perf.data files.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Signed-off-by: He Kuang <hekuang@...wei.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Zefan Li <lizefan@...wei.com>
> Cc: pi3orama@....com
> ---
>  tools/perf/util/data.c | 36 ++++++++++++++++++++++++++++++++++++
>  tools/perf/util/data.h | 11 ++++++++++-
>  2 files changed, 46 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> index 1921942..bfded6a 100644
> --- a/tools/perf/util/data.c
> +++ b/tools/perf/util/data.c
> @@ -136,3 +136,39 @@ ssize_t perf_data_file__write(struct perf_data_file *file,
>  {
>  	return writen(file->fd, buf, size);
>  }
> +
> +int perf_data_file__switch(struct perf_data_file *file,
> +			   const char *postfix,
> +			   size_t pos, bool at_exit)
> +{
> +	char *new_filepath;
> +	int ret;
> +
> +	if (check_pipe(file))
> +		return -EINVAL;
> +	if (perf_data_file__is_read(file))
> +		return -EINVAL;
> +
> +	if (asprintf(&new_filepath, "%s.%s", file->path, postfix) < 0)
> +		return -ENOMEM;
> +
> +	rename(file->path, new_filepath);

should we check for rename's return value?

jirka