libs/nixio/src/nixio.c

   1 /*
   2  * nixio - Linux I/O library for lua
   3  *
   4  *   Copyright (C) 2009 Steven Barth <steven@midlink.org>
   5  *
   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
   9  *
  10  *      http://www.apache.org/licenses/LICENSE-2.0
  11  *
  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.
  17  */
  18
  19 #include "nixio.h"
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <errno.h>
  23 #include <signal.h>
  24
  25 #define VERSION 0.2
  26
  27
  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);
  32         } else {
  33                 lua_pushnil(L);
  34         }
  35     lua_pushinteger(L, errno);
  36     lua_pushstring(L, strerror(errno));
  37     return 3;
  38 }
  39
  40 /* pushes true, if operation succeeded, otherwise call nixio__perror */
  41 int nixio__pstatus(lua_State *L, int condition) {
  42         if (condition) {
  43                 lua_pushboolean(L, 1);
  44                 return 1;
  45         } else {
  46                 return nixio__perror(L);
  47         }
  48 }
  49
  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");
  54     return sock;
  55 }
  56
  57 /* read fd from nixio_sock object */
  58 int nixio__checksockfd(lua_State *L) {
  59         return nixio__checksock(L)->fd;
  60 }
  61
  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");
  66 }
  67
  68 /* return any possible fd */
  69 int nixio__tofd(lua_State *L, int ud) {
  70         void *udata = lua_touserdata(L, ud);
  71         int fd = -1;
  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)) {
  79                         fd = *((int*)udata);
  80                 } else if (lua_rawequal(L, -1, -4)) {
  81                         fd = (*((FILE **)udata)) ? fileno(*((FILE **)udata)) : -1;
  82                 }
  83                 lua_pop(L, 4);
  84         }
  85         return fd;
  86 }
  87
  88 static int nixio_strerror(lua_State *L) {
  89         lua_pushstring(L, strerror(luaL_checkinteger(L, 1)));
  90         return 1;
  91 }
  92
  93 /* object table */
  94 static const luaL_reg R[] = {
  95         {"strerror",    nixio_strerror},
  96         {NULL,                  NULL}
  97 };
  98
  99 /* entry point */
 100 LUALIB_API int luaopen_nixio(lua_State *L) {
 101         /* create metatable */
 102         luaL_newmetatable(L, NIXIO_META);
 103
 104         /* metatable.__index = metatable */
 105         lua_pushvalue(L, -1);
 106         lua_setfield(L, -2, "__index");
 107
 108         /* register module */
 109         luaL_register(L, "nixio", R);
 110
 111         /* register metatable as socket_meta */
 112         lua_pushvalue(L, -2);
 113         lua_setfield(L, -2, "meta_socket");
 114
 115         /* register methods */
 116         nixio_open_file(L);
 117         nixio_open_socket(L);
 118         nixio_open_sockopt(L);
 119         nixio_open_bind(L);
 120         nixio_open_address(L);
 121         nixio_open_poll(L);
 122         nixio_open_io(L);
 123         nixio_open_splice(L);
 124         nixio_open_process(L);
 125         nixio_open_syslog(L);
 126         nixio_open_tls_context(L);
 127         nixio_open_tls_socket(L);
 128
 129         /* module version */
 130         lua_pushnumber(L, VERSION);
 131         lua_setfield(L, -2, "version");
 132
 133         /* some constants */
 134         lua_createtable(L, 0, 49);
 135
 136         NIXIO_PUSH_CONSTANT(EACCES);
 137         NIXIO_PUSH_CONSTANT(EINTR);
 138         NIXIO_PUSH_CONSTANT(ENOSYS);
 139         NIXIO_PUSH_CONSTANT(EINVAL);
 140         NIXIO_PUSH_CONSTANT(EWOULDBLOCK);
 141         NIXIO_PUSH_CONSTANT(EAGAIN);
 142         NIXIO_PUSH_CONSTANT(ENOMEM);
 143         NIXIO_PUSH_CONSTANT(ENOENT);
 144         NIXIO_PUSH_CONSTANT(ECHILD);
 145         NIXIO_PUSH_CONSTANT(EIO);
 146         NIXIO_PUSH_CONSTANT(EBADF);
 147         NIXIO_PUSH_CONSTANT(EFAULT);
 148         NIXIO_PUSH_CONSTANT(EFBIG);
 149         NIXIO_PUSH_CONSTANT(ENOSPC);
 150         NIXIO_PUSH_CONSTANT(EPIPE);
 151         NIXIO_PUSH_CONSTANT(ESPIPE);
 152         NIXIO_PUSH_CONSTANT(EISDIR);
 153         NIXIO_PUSH_CONSTANT(EPERM);
 154         NIXIO_PUSH_CONSTANT(EEXIST);
 155         NIXIO_PUSH_CONSTANT(ELOOP);
 156         NIXIO_PUSH_CONSTANT(EMFILE);
 157         NIXIO_PUSH_CONSTANT(ENAMETOOLONG);
 158         NIXIO_PUSH_CONSTANT(ENFILE);
 159         NIXIO_PUSH_CONSTANT(ENODEV);
 160         NIXIO_PUSH_CONSTANT(ENOTDIR);
 161         NIXIO_PUSH_CONSTANT(ENXIO);
 162         NIXIO_PUSH_CONSTANT(EOVERFLOW);
 163         NIXIO_PUSH_CONSTANT(EROFS);
 164         NIXIO_PUSH_CONSTANT(ETXTBSY);
 165         NIXIO_PUSH_CONSTANT(EAFNOSUPPORT);
 166         NIXIO_PUSH_CONSTANT(ENOBUFS);
 167         NIXIO_PUSH_CONSTANT(EPROTONOSUPPORT);
 168         NIXIO_PUSH_CONSTANT(ENOPROTOOPT);
 169         NIXIO_PUSH_CONSTANT(EBUSY);
 170         NIXIO_PUSH_CONSTANT(ESRCH);
 171         NIXIO_PUSH_CONSTANT(SIGALRM);
 172         NIXIO_PUSH_CONSTANT(SIGINT);
 173         NIXIO_PUSH_CONSTANT(SIGTERM);
 174         NIXIO_PUSH_CONSTANT(SIGKILL);
 175         NIXIO_PUSH_CONSTANT(SIGHUP);
 176         NIXIO_PUSH_CONSTANT(SIGSTOP);
 177         NIXIO_PUSH_CONSTANT(SIGCONT);
 178         NIXIO_PUSH_CONSTANT(SIGSEGV);
 179         NIXIO_PUSH_CONSTANT(SIGCHLD);
 180         NIXIO_PUSH_CONSTANT(SIGQUIT);
 181         NIXIO_PUSH_CONSTANT(SIGUSR1);
 182         NIXIO_PUSH_CONSTANT(SIGUSR2);
 183         NIXIO_PUSH_CONSTANT(SIGIO);
 184         NIXIO_PUSH_CONSTANT(SIGURG);
 185
 186         lua_setfield(L, -2, "const");
 187
 188         /* remove meta table */
 189         lua_remove(L, -2);
 190
 191         return 1;
 192 }