Fix EPIPE failure when writing to nscd, bug #80413

--- shadow-4.0.7/lib/nscd.c	2005-07-08 14:59:49.000000000 +0200
+++ shadow-4.0.7.az/lib/nscd.c	2005-07-08 14:59:22.000000000 +0200
@@ -71,6 +71,7 @@
 {
 	int sock = nscd_open_socket ();
 	request_header req;
+	struct iovec iov[2];
 	ssize_t nbytes;
 
 	if (sock == -1)
@@ -78,15 +79,15 @@
 
 	req.version = NSCD_VERSION;
 	req.type = INVALIDATE;
-	req.key_len = strlen (service) + 1;
-	nbytes = write (sock, &req, sizeof (request_header));
-	if (nbytes != sizeof (request_header)) {
-		close (sock);
-		return -1;
-	}
+	req.key_len = strlen(service);
+
+	iov[0].iov_base = &req;
+	iov[0].iov_len = sizeof (req);
+	iov[1].iov_base = service;
+	iov[1].iov_len = req.key_len;
 
-	nbytes = write (sock, (void *) service, req.key_len);
+	nbytes = writev(sock, iov, 2);
 
 	close (sock);
-	return (nbytes != req.key_len ? (-1) : 0);
+	return (nbytes != iov[0].iov_len + iov[1].iov_len ? (-1) : 0);
 }