There is no main thread in RTEMS

The resolv module has a questionable fall back strategy on error.

freebsd-userspace/lib/libc/include/nss_tls.h

@@ -50,14 +50,9 @@ name##_keyinit(void)							\
 static int							\
 name##_getstate(struct name##_state **p)			\
 {								\
-	static struct name##_state st;				\
 	static pthread_once_t	keyinit = PTHREAD_ONCE_INIT;	\
 	int			rv;				\
 								\
-	if (!__isthreaded || _pthread_main_np() != 0) {		\
-		*p = &st;					\
-		return (0);					\
-	}							\
 	rv = _pthread_once(&keyinit, name##_keyinit);		\
 	if (rv != 0)						\
 		return (rv);					\

freebsd-userspace/lib/libc/net/netdb_private.h

@@ -31,7 +31,6 @@
 #include <stdio.h>				/* XXX: for FILE */
 
 #define	NETDB_THREAD_ALLOC(name)					\
-static struct name name;						\
 static thread_key_t name##_key;						\
 static once_t name##_init_once = ONCE_INITIALIZER;			\
 static int name##_thr_keycreated = 0;					\
@@ -50,8 +49,6 @@ __##name##_init(void)							\
 {									\
 	struct name *he;						\
 									\
-	if (thr_main() != 0)						\
-		return (&name);						\
 	if (thr_once(&name##_init_once, name##_keycreate) != 0 ||	\
 	    !name##_thr_keycreated)					\
 		return (NULL);						\

freebsd-userspace/lib/libc/resolv/res_state.c

@@ -66,8 +66,10 @@ __res_state(void)
 {
 	res_state statp;
 
+#ifndef __rtems__
 	if (thr_main() != 0)
 		return (&_res);
+#endif /* __rtems__ */
 
 	if (thr_once(&res_init_once, res_keycreate) != 0 ||
 	    !res_thr_keycreated)