af_unix: add lxc_abstract_unix_send_fds_iov

src/lxc/af_unix.c

@@ -153,19 +153,16 @@ int lxc_abstract_unix_connect(const char *path)
 	return fd;
 }
 
-int lxc_abstract_unix_send_fds(int fd, int *sendfds, int num_sendfds,
-			       void *data, size_t size)
+int lxc_abstract_unix_send_fds_iov(int fd, int *sendfds, int num_sendfds,
+				   struct iovec *iov, size_t iovlen)
 {
 	__do_free char *cmsgbuf = NULL;
 	int ret;
 	struct msghdr msg;
-	struct iovec iov;
 	struct cmsghdr *cmsg = NULL;
-	char buf[1] = {0};
 	size_t cmsgbufsize = CMSG_SPACE(num_sendfds * sizeof(int));
 
 	memset(&msg, 0, sizeof(msg));
-	memset(&iov, 0, sizeof(iov));
 
 	cmsgbuf = malloc(cmsgbufsize);
 	if (!cmsgbuf) {
@@ -185,10 +182,8 @@ int lxc_abstract_unix_send_fds(int fd, int *sendfds, int num_sendfds,
 
 	memcpy(CMSG_DATA(cmsg), sendfds, num_sendfds * sizeof(int));
 
-	iov.iov_base = data ? data : buf;
-	iov.iov_len = data ? size : sizeof(buf);
-	msg.msg_iov = &iov;
-	msg.msg_iovlen = 1;
+	msg.msg_iov = iov;
+	msg.msg_iovlen = iovlen;
 
 again:
 	ret = sendmsg(fd, &msg, MSG_NOSIGNAL);
@@ -199,6 +194,18 @@ again:
 	return ret;
 }
 
+int lxc_abstract_unix_send_fds(int fd, int *sendfds, int num_sendfds,
+			       void *data, size_t size)
+{
+	char buf[1] = {0};
+	struct iovec iov = {
+		.iov_base = data ? data : buf,
+		.iov_len = data ? size : sizeof(buf),
+	};
+	return lxc_abstract_unix_send_fds_iov(fd, sendfds, num_sendfds, &iov,
+					      1);
+}
+
 int lxc_unix_send_fds(int fd, int *sendfds, int num_sendfds, void *data,
 		      size_t size)
 {

src/lxc/af_unix.h

@@ -35,6 +35,9 @@ extern void lxc_abstract_unix_close(int fd);
 extern int lxc_abstract_unix_connect(const char *path);
 extern int lxc_abstract_unix_send_fds(int fd, int *sendfds, int num_sendfds,
 				      void *data, size_t size);
+extern int lxc_abstract_unix_send_fds_iov(int fd, int *sendfds,
+					  int num_sendfds, struct iovec *iov,
+					  size_t iovlen);
 extern int lxc_unix_send_fds(int fd, int *sendfds, int num_sendfds, void *data,
 			     size_t size);
 extern int lxc_abstract_unix_recv_fds(int fd, int *recvfds, int num_recvfds,