winstonw made me discover there is no ELOOP in Plan 9:

http://plan9.bell-labs.com/sources/plan9/sys/include/ape/errno.h

misc.c

@@ -30,7 +30,7 @@
 #include <grp.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.184 2012/03/23 21:58:22 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.185 2012/03/26 20:04:05 tg Exp $");
 
 /* type bits for unsigned char */
 unsigned char chtypes[UCHAR_MAX + 1];
@@ -1311,6 +1311,10 @@ ksh_get_wd(void)
 	return (rv);
 }
 
+#ifndef ELOOP
+#define ELOOP		E2BIG
+#endif
+
 char *
 do_realpath(const char *upath)
 {