NSDISPATCH(3): Add rtems_nss_register_module()

freebsd/include/nsswitch.h

@@ -215,7 +215,9 @@ typedef struct _ns_mod {
 	void		*handle;	/* handle from dlopen */
 	ns_mtab		*mtab;		/* method table */
 	unsigned int	 mtabsize;	/* count of entries in method table */
+#ifndef __rtems__
 	nss_module_unregister_fn unregister; /* called to unload module */
+#endif /* __rtems__ */
 } ns_mod;
 
 #endif /* _NS_PRIVATE */
@@ -238,6 +240,22 @@ extern	int		 _nsyylineno;
 extern	void		 _nsdbtdump(const ns_dbt *);
 #endif
 #endif /* _NS_PRIVATE */
+#ifdef __rtems__
+/**
+ * @brief Registers a name service module.
+ *
+ * @param[in] source The source identifier.
+ * @param[in] mtab The module table.  This table will be claimed by the name
+ *   service dispatcher.
+ * @param[in] mtabsize The module table entry count.
+ *
+ * @retval 0 Successful operation.
+ * @retval -1 An error occurred.  The errno is set to indicate the error.
+ */
+int
+rtems_nss_register_module(const char *source, ns_mtab *mtab,
+    unsigned int mtabsize);
+#endif /* __rtems__ */
 
 __END_DECLS
 

freebsd/lib/libc/net/nsdispatch.c

@@ -132,9 +132,11 @@ static	ns_dbt			*_nsmap = NULL;
 static	unsigned int		 _nsmodsize;
 static	ns_mod			*_nsmod;
 
+#ifndef __rtems__
 /* Placeholder for builtin modules' dlopen `handle'. */
 static	int			 __nss_builtin_handle;
 static	void			*nss_builtin_handle = &__nss_builtin_handle;
+#endif /* __rtems__ */
 
 #ifdef NS_CACHING
 /*
@@ -189,11 +191,15 @@ static	int	 string_compare(const void *, const void *);
 static	int	 mtab_compare(const void *, const void *);
 static	int	 nss_configure(void);
 static	void	 ns_dbt_free(ns_dbt *);
+#ifndef __rtems__
 static	void	 ns_mod_free(ns_mod *);
+#endif /* __rtems__ */
 static	void	 ns_src_free(ns_src **, int);
+#ifndef __rtems__
 static	void	 nss_load_builtin_modules(void);
 static	void	 nss_load_module(const char *, nss_module_register_fn);
 static	void	 nss_atexit(void);
+#endif /* __rtems__ */
 /* nsparser */
 extern	FILE	*_nsyyin;
 
@@ -299,8 +305,12 @@ _nsdbtaddsrc(ns_dbt *dbt, const ns_src *src)
 	    sizeof(*src));
 	modp = vector_search(&src->name, _nsmod, _nsmodsize, sizeof(*_nsmod),
 	    string_compare);
+#ifndef __rtems__
 	if (modp == NULL)
 		nss_load_module(src->name, NULL);
+#else /* __rtems__ */
+	(void)modp;
+#endif /* __rtems__ */
 }
 
 
@@ -379,14 +389,18 @@ nss_configure(void)
 		goto fin;
 	VECTOR_FREE(_nsmap, &_nsmapsize, sizeof(*_nsmap),
 	    (vector_free_elem)ns_dbt_free);
+#ifndef __rtems__
 	VECTOR_FREE(_nsmod, &_nsmodsize, sizeof(*_nsmod),
 	    (vector_free_elem)ns_mod_free);
 	nss_load_builtin_modules();
+#endif /* __rtems__ */
 	_nsyyparse();
 	(void)fclose(_nsyyin);
 	vector_sort(_nsmap, _nsmapsize, sizeof(*_nsmap), string_compare);
+#ifndef __rtems__
 	if (confmod == 0)
 		(void)atexit(nss_atexit);
+#endif /* __rtems__ */
 	confmod = statbuf.st_mtime;
 
 #ifdef NS_CACHING
@@ -456,6 +470,7 @@ ns_src_free(ns_src **src, int srclistsize)
 
 
 
+#ifndef __rtems__
 /*
  * NSS module management.
  */
@@ -499,7 +514,6 @@ nss_load_module(const char *source, nss_module_register_fn reg_fn)
 		fn = reg_fn;
 	} else if (!is_dynamic())
 		goto fin;
-#ifndef __rtems__
 	else {
 		if (snprintf(buf, sizeof(buf), "nss_%s.so.%d", mod.name,
 		    NSS_MODULE_INTERFACE_VERSION) >= (int)sizeof(buf))
@@ -523,13 +537,10 @@ nss_load_module(const char *source, nss_module_register_fn reg_fn)
 			goto fin;
 		}
 	}
-#endif /* __rtems__ */
 	mod.mtab = fn(mod.name, &mod.mtabsize, &mod.unregister);
 	if (mod.mtab == NULL || mod.mtabsize == 0) {
-#ifndef __rtems__
 		if (mod.handle != nss_builtin_handle)
 			(void)dlclose(mod.handle);
-#endif /* __rtems__ */
 		mod.handle = NULL;
 		nss_log(LOG_ERR, "%s, registration failed", mod.name);
 		goto fin;
@@ -553,10 +564,8 @@ ns_mod_free(ns_mod *mod)
 		return;
 	if (mod->unregister != NULL)
 		mod->unregister(mod->mtab, mod->mtabsize);
-#ifndef __rtems__
 	if (mod->handle != nss_builtin_handle)
 		(void)dlclose(mod->handle);
-#endif /* __rtems__ */
 }
 
 
@@ -579,6 +588,43 @@ nss_atexit(void)
 	if (isthreaded)
 		(void)_pthread_rwlock_unlock(&nss_lock);
 }
+#else /* __rtems__ */
+int
+rtems_nss_register_module(const char *source, ns_mtab *mtab,
+    unsigned int mtabsize)
+{
+	ns_mod mod;
+	int result;
+
+	if (mtab == NULL || mtabsize == 0) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	memset(&mod, 0, sizeof(mod));
+	mod.name = strdup(source);
+	if (mod.name == NULL) {
+		return -1;
+	}
+	mod.handle = (void *)1;
+	mod.mtab = mtab;
+	mod.mtabsize = mtabsize;
+	qsort(mod.mtab, mod.mtabsize, sizeof(mod.mtab[0]), mtab_compare);
+
+	result = _pthread_rwlock_wrlock(&nss_lock);
+	if (result != 0) {
+		errno = result;
+		return -1;
+	}
+
+	_nsmod = vector_append(&mod, _nsmod, &_nsmodsize, sizeof(*_nsmod));
+	vector_sort(_nsmod, _nsmodsize, sizeof(*_nsmod), string_compare);
+
+	(void)_pthread_rwlock_unlock(&nss_lock);
+
+	return 0;
+}
+#endif /* __rtems__ */