linux-kernel - [PATCH 6/6] perf utils: readlink /proc/self/exe to find the perf binary

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Date:   Wed, 22 Mar 2017 15:06:24 +0200
From:   Tommi Rantala <tommi.t.rantala@...ia.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC:     <linux-kernel@...r.kernel.org>,
        Tommi Rantala <tommi.t.rantala@...ia.com>
Subject: [PATCH 6/6] perf utils: readlink /proc/self/exe to find the perf binary

Signed-off-by: Tommi Rantala <tommi.t.rantala@...ia.com>
---
 tools/perf/util/header.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index ab10e9d..c6243af 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -370,15 +370,11 @@ static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
 			 struct perf_evlist *evlist __maybe_unused)
 {
 	char buf[MAXPATHLEN];
-	char proc[32];
 	u32 n;
 	int i, ret;
 
-	/*
-	 * actual atual path to perf binary
-	 */
-	sprintf(proc, "/proc/%d/exe", getpid());
-	ret = readlink(proc, buf, sizeof(buf)-1);
+	/* actual path to perf binary */
+	ret = readlink("/proc/self/exe", buf, sizeof(buf)-1);
 	if (ret <= 0)
 		return -1;
 
-- 
2.9.3