-/* $Id$ */
-
/* rl_dns - name resolution (real life) */
-/* Copyright (c) 2003, 2004 Martin Quinson. All rights reserved. */
+/* Copyright (c) 2005, 2009, 2010. The SimGrid Team.
+ * All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include "gras/Virtu/virtu_rl.h"
+#include "portable.h"
-/* A portable DNS resolver is a nightmare to do in a portable manner */
+/* A portable DNS resolver is a nightmare to do in a portable manner.
+ keep it simple/stupid for now. */
-/* the ADNS library is a good candidate for inclusion in the source tree, but
- * it would be a bit too much. We need a stripped down version of it, and it's
- * a bit too late for this tonight.
- *
- * Next time maybe ;)
- */
-const char *gras_os_myname(void) {
- return "(unknown host)";
-}
+const char *gras_os_myname(void)
+{
+ static char myname[255];
+ static int initialized = 0;
+
+ if (initialized)
+ return myname;
+
+ if (gethostname(myname, 255) == -1) {
+#ifdef HAVE_SYS_SOCKET_H
+ /* gethostname() failed! Trying with localhost instead.
+ We first need to query the DNS to make sure localhost is resolved
+ See the note in nws/Portability/dnsutil.c about {end,set}hostent() */
+ struct hostent *tmp;
+ sethostent(0);
+ tmp = gethostbyname("localhost");
+ endhostent();
+ if (tmp) {
+ strncpy(myname, tmp->h_name, 255);
+ } else {
+ /* Erm. localhost cannot be resolved. There's something wrong in the user DNS setting */
+ sprintf(myname, "(misconfigured host)");
+ }
+#else
+ sprintf(myname, "(misconfigured windows host)");
+#endif
+ }
+
+ myname[254] = '\0';
+
+ initialized = 1;
+ return myname;
+}
