X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/18d865e6985d7a5903eac874c8942b7001310625..537c056a021b3f8955560913638ce292d575e862:/src/gras/Virtu/rl_dns.c

diff --git a/src/gras/Virtu/rl_dns.c b/src/gras/Virtu/rl_dns.c
index 75dd9b671b..8e7f9e96aa 100644
--- a/src/gras/Virtu/rl_dns.c
+++ b/src/gras/Virtu/rl_dns.c
@@ -1,24 +1,48 @@
-/* $Id$ */
-
 /* 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"
-
-/* A portable DNS resolver is a nightmare to do in a portable manner */
-
-/* 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)";
+#include "portable.h"
+
+/* A portable DNS resolver is a nightmare to do in a portable manner.
+   keep it simple/stupid for now. */
+
+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;
 }
-