From: Wouter Verhelst <w@uter.be>
Date: Fri, 5 Jun 2009 19:43:54 +0000 (+0200)
Subject: Avoid unaligned access
X-Git-Url: http://git.alex.org.uk

Avoid unaligned access

nbd-tester-client tried to write to a char array in a packed struct by
casting it to an u64 pointer and dereferencing it. That causes unaligned
access and, hence, a SIGBUS on SPARC.

Fix by using memcpy instead.
---

diff --git a/nbd-tester-client.c b/nbd-tester-client.c
index 40a6363..3dde737 100644
--- a/nbd-tester-client.c
+++ b/nbd-tester-client.c
@@ -245,7 +245,7 @@ int throughput_test(gchar* hostname, int port, int sock, char sock_is_open, char
 	}
 	for(i=0;i+1024<=size;i+=1024) {
 		if(do_write) {
-			*((u64*)req.handle)=i;
+			memcpy(&(req.handle),&i,sizeof(i));
 			req.from=htonll(i);
 			write(sock, &req, sizeof(req));
 			printf("Requests(+): %d\n", ++requests);