* Add note explaining why you can't use OMPI_DEBUG_ZERO (which was my

first reaction when I saw the commit).  Also, use
  ifconf.ifc_len instead of ifc_len.  Shouldn't matter, but be careful.

This commit was SVN r4989.

src/util/if.c

@@ -126,8 +126,12 @@ static int ompi_ifinit(void)
             return OMPI_ERROR;
         }
 
-        /* initialize the memory so valgrind and purify won't complain */
-        memset(ifconf.ifc_req, 0, ifc_len);
+        /* initialize the memory so valgrind and purify won't complain
+         * can't use OMPI_DEBUG_ZERO because sizeof(ifconf.ifc_req)
+         * isn't userful.  Since this isn't performance critical, just
+         * always memset.
+         */
+        memset(ifconf.ifc_req, 0, ifconf.ifc_len);
         
         if(ioctl(sd, SIOCGIFCONF, &ifconf) < 0) {
             /* if we got an einval, we probably don't have enough