Commit 55f77128 authored Mar 22, 2017 by Tommi Rantala Committed by Arnaldo Carvalho de Melo Mar 27, 2017

perf utils: Readlink /proc/self/exe to find the perf binary



Simplification: it is easier to open /proc/self/exe than /proc/$pid/exe.

Signed-off-by: Tommi Rantala <tommi.t.rantala@nokia.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170322130624.21881-7-tommi.t.rantala@nokia.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent d4b364df

tools/perf/util/header.c

+2 −6

Original line number	Diff line number	Diff line
		@@ -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;