From 7eac7e9e726c1b136bd7e0ad6671ce315f48bb18 Mon Sep 17 00:00:00 2001
From: Pierre Habouzit <pierre.habouzit@intersec.com>
Date: Fri, 7 Aug 2009 14:16:00 +0200
Subject: perf util: Fix do_read() to fail on EOF instead of busy-looping

While toying with perf, I've noticed that perf record can
easily enter a busy loop when doing something as silly as:

    $ perf record -A ls

Yeah, do_read here really wants to read a known size, not being
able to should die(), not busy-loop ;)

That was the cause for the bug.

Signed-off-by: Pierre Habouzit <pierre.habouzit@intersec.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 tools/perf/util/header.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 95a44bc..b92a457 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -185,6 +185,8 @@ static void do_read(int fd, void *buf, size_t size)
 
 		if (ret < 0)
 			die("failed to read");
+		if (ret == 0)
+			die("failed to read: missing data");
 
 		size -= ret;
 		buf += ret;
-- 
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