From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Thu, 6 Aug 2015 01:26:34 +0000 (-0400)
Subject: Fix: Use MSG_NOSIGNAL when calling sendmsg()
X-Git-Tag: v2.7.0-rc2~162
X-Git-Url: http://git.lttng.org./?a=commitdiff_plain;h=b51ae08035921b63b417f9364081b92d70280e9f;hp=3328542ec9bca266e88aafbcace196a5c5c6a43f;p=lttng-tools.git

Fix: Use MSG_NOSIGNAL when calling sendmsg()

Applications using the liblttng-ctl library are most probably
not expecting the SIGPIPE signal which can be triggered by
sendmsg() on a closed socket. Use the MSG_NOSIGNAL flag to
handle such cases gracefully.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/common/sessiond-comm/unix.c b/src/common/sessiond-comm/unix.c
index 97537c538..a66bb750a 100644
--- a/src/common/sessiond-comm/unix.c
+++ b/src/common/sessiond-comm/unix.c
@@ -173,7 +173,7 @@ ssize_t lttcomm_recv_unix_sock(int sock, void *buf, size_t len)
 
 	do {
 		len_last = iov[0].iov_len;
-		ret = recvmsg(sock, &msg, 0);
+		ret = recvmsg(sock, &msg, MSG_NOSIGNAL);
 		if (ret > 0) {
 			iov[0].iov_base += ret;
 			iov[0].iov_len -= ret;