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.
28 /* pushes nil, error number and errstring on the stack */
29 int nixio__perror(lua_State *L) {
30 if (errno == EAGAIN) {
31 lua_pushboolean(L, 0);
35 lua_pushinteger(L, errno);
36 lua_pushstring(L, strerror(errno));
40 /* pushes true, if operation succeeded, otherwise call nixio__perror */
41 int nixio__pstatus(lua_State *L, int condition) {
43 lua_pushboolean(L, 1);
46 return nixio__perror(L);
50 /* checks whether the first argument is a socket and returns it */
51 nixio_sock* nixio__checksock(lua_State *L) {
52 nixio_sock *sock = (nixio_sock*)luaL_checkudata(L, 1, NIXIO_META);
53 luaL_argcheck(L, sock->fd != -1, 1, "invalid socket object");
57 /* read fd from nixio_sock object */
58 int nixio__checksockfd(lua_State *L) {
59 return nixio__checksock(L)->fd;
62 /* return any possible fd, otherwise error out */
63 int nixio__checkfd(lua_State *L, int ud) {
64 int fd = nixio__tofd(L, ud);
65 return (fd != -1) ? fd : luaL_argerror(L, ud, "invalid file descriptor");
68 /* return any possible fd */
69 int nixio__tofd(lua_State *L, int ud) {
70 void *udata = lua_touserdata(L, ud);
72 if (lua_getmetatable(L, ud)) {
73 luaL_getmetatable(L, NIXIO_META);
74 luaL_getmetatable(L, NIXIO_FILE_META);
75 luaL_getmetatable(L, LUA_FILEHANDLE);
76 if (lua_rawequal(L, -3, -4)) {
77 fd = ((nixio_sock*)udata)->fd;
78 } else if (lua_rawequal(L, -2, -4)) {
80 } else if (lua_rawequal(L, -1, -4)) {
81 fd = (*((FILE **)udata)) ? fileno(*((FILE **)udata)) : -1;
88 static int nixio_strerror(lua_State *L) {
89 lua_pushstring(L, strerror(luaL_checkinteger(L, 1)));
94 static const luaL_reg R[] = {
95 {"strerror", nixio_strerror},
100 LUALIB_API int luaopen_nixio(lua_State *L) {
101 /* create metatable */
102 luaL_newmetatable(L, NIXIO_META);
104 /* metatable.__index = metatable */
105 lua_pushvalue(L, -1);
106 lua_setfield(L, -2, "__index");
108 /* register module */
109 luaL_register(L, "nixio", R);
111 /* register metatable as socket_meta */
112 lua_pushvalue(L, -2);
113 lua_setfield(L, -2, "meta_socket");
115 /* register methods */
117 nixio_open_socket(L);
118 nixio_open_sockopt(L);
120 nixio_open_address(L);
123 nixio_open_splice(L);
124 nixio_open_process(L);
125 nixio_open_tls_context(L);
126 nixio_open_tls_socket(L);
129 lua_pushnumber(L, VERSION);
130 lua_setfield(L, -2, "version");
133 lua_createtable(L, 0, 11);
135 NIXIO_PUSH_CONSTANT(EACCES);
136 NIXIO_PUSH_CONSTANT(ENOSYS);
137 NIXIO_PUSH_CONSTANT(EINVAL);
138 NIXIO_PUSH_CONSTANT(EWOULDBLOCK);
139 NIXIO_PUSH_CONSTANT(EAGAIN);
140 NIXIO_PUSH_CONSTANT(ENOMEM);
141 NIXIO_PUSH_CONSTANT(ENOENT);
142 NIXIO_PUSH_CONSTANT(SIGALRM);
143 NIXIO_PUSH_CONSTANT(SIGINT);
144 NIXIO_PUSH_CONSTANT(SIGTERM);
145 NIXIO_PUSH_CONSTANT(SIGKILL);
147 lua_setfield(L, -2, "const");
149 /* remove meta table */