linux-kernel - [PATCH v6 03/16] perf header: fail on write

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Message-Id: <20170718042549.145161-4-davidcc@google.com>
Date:   Mon, 17 Jul 2017 21:25:36 -0700
From:   David Carrillo-Cisneros <davidcc@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        David Ahern <dsahern@...il.com>,
        Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
        He Kuang <hekuang@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>,
        David Carrillo-Cisneros <davidcc@...gle.com>
Subject: [PATCH v6 03/16] perf header: fail on write_padded error

Do not proceed if write_padded error failed.

Also, add comments to remind that the return value of write_*
functions in util/header.c is an erro code and not the number
of bytes written.

Signed-off-by: David Carrillo-Cisneros <davidcc@...gle.com>
---
 tools/perf/util/header.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 3b833f06c4e7..8dda19b68ac4 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -74,6 +74,7 @@ bool perf_header__has_feat(const struct perf_header *header, int feat)
 	return test_bit(feat, header->adds_features);
 }
 
+/* Return: 0 if succeded, -ERR if failed. */
 static int do_write(int fd, const void *buf, size_t size)
 {
 	while (size) {
@@ -89,6 +90,7 @@ static int do_write(int fd, const void *buf, size_t size)
 	return 0;
 }
 
+/* Return: 0 if succeded, -ERR if failed. */
 int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
 {
 	static const char zero_buf[NAME_ALIGN];
@@ -103,6 +105,7 @@ int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
 #define string_size(str)						\
 	(PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
 
+/* Return: 0 if succeded, -ERR if failed. */
 static int do_write_string(int fd, const char *str)
 {
 	u32 len, olen;
@@ -3200,7 +3203,8 @@ int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
 	 */
 	tracing_data_put(tdata);
 
-	write_padded(fd, NULL, 0, padding);
+	if (write_padded(fd, NULL, 0, padding))
+		return -1;
 
 	return aligned_size;
 }
-- 
2.13.2.932.g7449e964c-goog