[tip:perf/core] perf tools: Handle EINTR error for readn/writen

From: tip-bot for Namhyung Kim
Date: Thu May 01 2014 - 02:31:08 EST


Commit-ID: e148c76083dc06ce618d768c0bee0a0edda96a54
Gitweb: http://git.kernel.org/tip/e148c76083dc06ce618d768c0bee0a0edda96a54
Author: Namhyung Kim <namhyung@xxxxxxxxxx>
AuthorDate: Thu, 24 Apr 2014 22:27:32 +0900
Committer: Jiri Olsa <jolsa@xxxxxxxxxx>
CommitDate: Tue, 29 Apr 2014 14:26:30 +0200

perf tools: Handle EINTR error for readn/writen

Those readn/writen functions are to ensure read/write does I/O for
a given size exactly. But ion() - its implementation - does not
handle in case it returns prematurely due to a signal. As it's not
an error itself so just retry the operation.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1398346054-3322-1-git-send-email-namhyung@xxxxxxxxxx
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
tools/perf/util/util.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 9f66549..7fff6be 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -166,6 +166,8 @@ static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
ssize_t ret = is_read ? read(fd, buf, left) :
write(fd, buf, left);

+ if (ret < 0 && errno == EINTR)
+ continue;
if (ret <= 0)
return ret;

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