linux-kernel - [RFC PATCH v7 2/6] perf data: Allow to use given fd in data->file.fd

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Date: Tue,  2 Apr 2024 17:44:32 -0400
From: weilin.wang@...el.com
To: weilin.wang@...el.com,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Cc: linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Perry Taylor <perry.taylor@...el.com>,
	Samantha Alt <samantha.alt@...el.com>,
	Caleb Biggers <caleb.biggers@...el.com>
Subject: [RFC PATCH v7 2/6] perf data: Allow to use given fd in data->file.fd

From: Weilin Wang <weilin.wang@...el.com>

When in PIPE mode, allow to use fd dynamically opened and asigned to
data->file.fd instead of STDIN_FILENO or STDOUT_FILENO.

Signed-off-by: Weilin Wang <weilin.wang@...el.com>
---
 tools/perf/util/data.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index 08c4bfbd817f..98661ede2a73 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -204,7 +204,12 @@ static bool check_pipe(struct perf_data *data)
 				data->file.fd = fd;
 				data->use_stdio = false;
 			}
-		} else {
+
+		/*
+		 * When is_pipe and data->file.fd is given, use given fd
+		 * instead of STDIN_FILENO or STDOUT_FILENO
+		 */
+		} else if (data->file.fd <= 0) {
 			data->file.fd = fd;
 		}
 	}
-- 
2.43.0