From 2e5d256984adb6864ece82fb689ddb2b20e10e4d Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Fri, 20 Jun 2014 02:13:38 -0400
Subject: fix sendmmsg emulation return value for zero-length vector

this case is not even documented, but the kernel returns 0 here and it
makes sense to be consistent.
---
 src/network/sendmmsg.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/network/sendmmsg.c')

diff --git a/src/network/sendmmsg.c b/src/network/sendmmsg.c
index ff9f8618..eeae1d0a 100644
--- a/src/network/sendmmsg.c
+++ b/src/network/sendmmsg.c
@@ -12,6 +12,7 @@ int sendmmsg(int fd, struct mmsghdr *msgvec, unsigned int vlen, unsigned int fla
 	 * and the cmsg blocks cannot be modified in-place. */
 	int i;
 	if (vlen > IOV_MAX) vlen = IOV_MAX; /* This matches the kernel. */
+	if (!vlen) return 0;
 	for (i=0; i<vlen; i++) {
 		/* As an unfortunate inconsistency, the sendmmsg API uses
 		 * unsigned int for the resulting msg_len, despite sendmsg
-- 
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