2 * nixio - Linux I/O library for lua
4 * Copyright (C) 2009 Steven Barth <steven@midlink.org>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
26 #include <sys/socket.h>
33 /* pushes nil, error number and errstring on the stack */
34 int nixio__perror(lua_State *L) {
36 lua_pushinteger(L, errno);
37 lua_pushstring(L, strerror(errno));
41 /* pushes true, if operation succeeded, otherwise call nixio__perror */
42 int nixio__pstatus(lua_State *L, int condition) {
44 lua_pushboolean(L, 1);
47 return nixio__perror(L);
51 /* checks whether the first argument is a socket and returns it */
52 nixio_sock* nixio__checksock(lua_State *L) {
53 nixio_sock *sock = (nixio_sock*)luaL_checkudata(L, 1, NIXIO_META);
54 luaL_argcheck(L, sock->fd != -1, 1, "invalid socket object");
58 /* read fd from nixio_sock object */
59 int nixio__checksockfd(lua_State *L) {
60 return nixio__checksock(L)->fd;
63 /* return any possible fd, otherwise error out */
64 int nixio__checkfd(lua_State *L, int ud) {
65 int fd = nixio__tofd(L, ud);
66 return (fd != -1) ? fd : luaL_argerror(L, ud, "invalid file descriptor");
69 /* return any possible fd */
70 int nixio__tofd(lua_State *L, int ud) {
71 void *udata = lua_touserdata(L, ud);
73 if (udata && lua_getmetatable(L, ud)) {
74 luaL_getmetatable(L, NIXIO_META);
75 luaL_getmetatable(L, LUA_FILEHANDLE);
76 if (lua_rawequal(L, -2, -3)) {
77 fd = ((nixio_sock*)udata)->fd;
78 } else if (lua_rawequal(L, -1, -3)) {
79 fd = fileno(*((FILE **)udata));
87 static const luaL_reg R[] = {
92 LUALIB_API int luaopen_nixio(lua_State *L) {
93 /* create metatable */
94 luaL_newmetatable(L, NIXIO_META);
100 /* metatable.__index = M */
101 lua_setfield(L, -3, "__index");
104 /* register module */
105 luaL_register(L, "nixio", R);
107 /* register methods */
108 nixio_open_socket(L);
109 nixio_open_sockopt(L);
111 nixio_open_address(L);
112 nixio_open_select(L);
115 lua_pushnumber(L, VERSION);
116 lua_setfield(L, -2, "version");
118 /* remove meta table */