1 files changed, 122 insertions, 0 deletions
diff --git a/libs/nixio/src/nixio.c b/libs/nixio/src/nixio.c
new file mode 100644
index 000000000..1152f2cc8
--- /dev/null
+++ b/libs/nixio/src/nixio.c
@@ -0,0 +1,122 @@
+/*
+ * nixio - Linux I/O library for lua
+ *
+ *   Copyright (C) 2009 Steven Barth <steven@midlink.org>
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include "nixio.h"
+
+#define VERSION 0.1
+
+
+/* pushes nil, error number and errstring on the stack */
+int nixio__perror(lua_State *L) {
+    lua_pushnil(L);
+    lua_pushinteger(L, errno);
+    lua_pushstring(L, strerror(errno));
+    return 3;
+}
+
+/* pushes true, if operation succeeded, otherwise call nixio__perror */
+int nixio__pstatus(lua_State *L, int condition) {
+	if (condition) {
+		lua_pushboolean(L, 1);
+		return 1;
+	} else {
+		return nixio__perror(L);
+	}
+}
+
+/* checks whether the first argument is a socket and returns it */
+nixio_sock* nixio__checksock(lua_State *L) {
+    nixio_sock *sock = (nixio_sock*)luaL_checkudata(L, 1, NIXIO_META);
+    luaL_argcheck(L, sock->fd != -1, 1, "invalid socket object");
+    return sock;
+}
+
+/* read fd from nixio_sock object */
+int nixio__checksockfd(lua_State *L) {
+	return nixio__checksock(L)->fd;
+}
+
+/* return any possible fd, otherwise error out */
+int nixio__checkfd(lua_State *L, int ud) {
+	int fd = nixio__tofd(L, ud);
+	return (fd != -1) ? fd : luaL_argerror(L, ud, "invalid file descriptor");
+}
+
+/* return any possible fd */
+int nixio__tofd(lua_State *L, int ud) {
+	void *udata = lua_touserdata(L, ud);
+	int fd = -1;
+	if (udata && lua_getmetatable(L, ud)) {
+		luaL_getmetatable(L, NIXIO_META);
+		luaL_getmetatable(L, LUA_FILEHANDLE);
+		if (lua_rawequal(L, -2, -3)) {
+			fd = ((nixio_sock*)udata)->fd;
+		} else if (lua_rawequal(L, -1, -3)) {
+			fd = fileno(*((FILE **)udata));
+		}
+		lua_pop(L, 3);
+	}
+	return fd;
+}
+
+/* object table */
+static const luaL_reg R[] = {
+	{NULL,			NULL}
+};
+
+/* entry point */
+LUALIB_API int luaopen_nixio(lua_State *L) {
+	/* create metatable */
+	luaL_newmetatable(L, NIXIO_META);
+
+	/* method table */
+	lua_newtable(L);
+	lua_pushvalue(L, -1);
+
+	/* metatable.__index = M */
+	lua_setfield(L, -3, "__index");
+	lua_remove(L, -2);
+
+	/* register module */
+	luaL_register(L, "nixio", R);
+
+	/* register methods */
+	nixio_open_socket(L);
+	nixio_open_sockopt(L);
+	nixio_open_bind(L);
+	nixio_open_address(L);
+	nixio_open_select(L);
+
+	/* module version */
+	lua_pushnumber(L, VERSION);
+	lua_setfield(L, -2, "version");
+
+	/* remove meta table */
+	lua_remove(L, -2);
+
+	return 1;
+}