Fix possible system freeze on Mac OS X.

jnlib/mischelp.h

@@ -1,6 +1,6 @@
 /* mischelp.h - Miscellaneous helper macros and functions
  * Copyright (C) 1999, 2000, 2001, 2002, 2003,
- *               2006, 2007  Free Software Foundation, Inc.
+ *               2006, 2007, 2009  Free Software Foundation, Inc.
  *
  * This file is part of JNLIB.
  *
@@ -60,5 +60,35 @@ time_t timegm (struct tm *tm);
 #define wipememory(_ptr,_len) wipememory2(_ptr,0,_len)
 
 
+/* Include hacks which are mainly required for Slowaris.  */
+#if defined(JNLIB_NEED_AFLOCAL) && !defined(HAVE_W32_SYSTEM)
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#ifndef PF_LOCAL
+# ifdef PF_UNIX
+#  define PF_LOCAL PF_UNIX
+# else
+#  define PF_LOCAL AF_UNIX
+# endif
+#endif /*PF_LOCAL*/
+#ifndef AF_LOCAL
+# define AF_LOCAL AF_UNIX
+#endif /*AF_UNIX*/
+
+/* We used to avoid this macro in GnuPG and inlined the AF_LOCAL name
+   length computation directly with the little twist of adding 1 extra
+   byte.  It seems that this was needed once on an old HP/UX box and
+   there are also rumours that 4.3 Reno and DEC systems need it.  This
+   one-off buglet did not harm any current system until it came to Mac
+   OS X where the kernel (as of May 2009) exhibited a strange bug: The
+   systems basically froze in the connect call if the passed name
+   contained an invalid directory part.  Ignore the old Unices.  */
+#ifndef SUN_LEN
+# define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path) \
+	               + strlen ((ptr)->sun_path))
+#endif /*SUN_LEN*/
+#endif /*JNLIB_NEED_AFLOCAL && !HAVE_W32_SYSTEM*/
+
 
 #endif /*LIBJNLIB_MISCHELP_H*/