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From: Namhyung Kim <namhyung@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Jiri Olsa <jolsa@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
	David Ahern <dsahern@gmail.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Subject: [PATCH 4/4] perf probe: Propagate error code when write(2) failed
Date: Sat, 10 Jan 2015 19:33:48 +0900
Message-ID: <1420886028-15135-4-git-send-email-namhyung@kernel.org> (raw)
In-Reply-To: <1420886028-15135-1-git-send-email-namhyung@kernel.org>

When it failed to write probe commands to the probe_event file in
debugfs, it needs to propagate the error code properly.  Current code
blindly uses the return value of the write(2) so it always uses
-1 (-EPERM) and it might confuse users.

Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/probe-event.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 6fe5aa357efc..ddc295885af0 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2052,9 +2052,11 @@ static int write_probe_trace_event(int fd, struct probe_trace_event *tev)
 	pr_debug("Writing event: %s\n", buf);
 	if (!probe_event_dry_run) {
 		ret = write(fd, buf, strlen(buf));
-		if (ret <= 0)
+		if (ret <= 0) {
+			ret = -errno;
 			pr_warning("Failed to write event: %s\n",
 				   strerror_r(errno, sbuf, sizeof(sbuf)));
+		}
 	}
 	free(buf);
 	return ret;
-- 
2.2.1


  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-10 10:33 [PATCH 1/4] perf tools: Allow use of an exclusive option more than once Namhyung Kim
2015-01-10 10:33 ` [PATCH 2/4] perf probe: Do not rely on map__load() filter to find symbols Namhyung Kim
2015-01-12 12:31   ` Masami Hiramatsu
2015-01-14  1:45     ` Namhyung Kim
2015-01-14  8:42       ` Masami Hiramatsu
2015-01-10 10:33 ` [PATCH 3/4] perf probe: Fix probing kretprobes Namhyung Kim
2015-01-12 11:26   ` Jiri Olsa
2015-01-12 12:08     ` Masami Hiramatsu
2015-01-12 12:22   ` Masami Hiramatsu
2015-01-14  1:59     ` Namhyung Kim
2015-01-10 10:33 ` Namhyung Kim [this message]
2015-01-12 11:17   ` [PATCH 4/4] perf probe: Propagate error code when write(2) failed Masami Hiramatsu
2015-01-12 14:03     ` Arnaldo Carvalho de Melo
2015-01-17 10:10   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2015-01-12 11:44 ` [PATCH 1/4] perf tools: Allow use of an exclusive option more than once Masami Hiramatsu
2015-01-12 14:02   ` Arnaldo Carvalho de Melo
2015-01-28 15:06 ` [tip:perf/core] " tip-bot for Namhyung Kim

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