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 0.4
  26
  27
  28 /* pushes nil, error number and errstring on the stack */
  29 int nixio__perror(lua_State *L) {
  30         if (errno == EAGAIN || errno == EWOULDBLOCK) {
  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 /* An empty iterator */
  89 int nixio__nulliter(lua_State *L) {
  90         lua_pushnil(L);
  91         return 1;
  92 }
  93
  94 static int nixio_errno(lua_State *L) {
  95         lua_pushinteger(L, errno);
  96         return 1;
  97 }
  98
  99 static int nixio_strerror(lua_State *L) {
 100         lua_pushstring(L, strerror(luaL_checkinteger(L, 1)));
 101         return 1;
 102 }
 103
 104 /* object table */
 105 static const luaL_reg R[] = {
 106         {"errno",               nixio_errno},
 107         {"strerror",    nixio_strerror},
 108         {NULL,                  NULL}
 109 };
 110
 111 /* entry point */
 112 NIXIO_API int luaopen_nixio(lua_State *L) {
 113         /* create metatable */
 114         luaL_newmetatable(L, NIXIO_META);
 115
 116         /* metatable.__index = metatable */
 117         lua_pushvalue(L, -1);
 118         lua_setfield(L, -2, "__index");
 119
 120         /* register module */
 121         luaL_register(L, "nixio", R);
 122
 123         /* register metatable as socket_meta */
 124         lua_pushvalue(L, -2);
 125         lua_setfield(L, -2, "meta_socket");
 126
 127         /* register methods */
 128 #ifdef __WINNT__
 129         nixio_open__mingw(L);
 130 #endif
 131         nixio_open_file(L);
 132         nixio_open_socket(L);
 133         nixio_open_sockopt(L);
 134         nixio_open_bind(L);
 135         nixio_open_address(L);
 136         nixio_open_protoent(L);
 137         nixio_open_poll(L);
 138         nixio_open_io(L);
 139         nixio_open_splice(L);
 140         nixio_open_process(L);
 141         nixio_open_syslog(L);
 142         nixio_open_bit(L);
 143         nixio_open_bin(L);
 144         nixio_open_fs(L);
 145         nixio_open_user(L);
 146
 147 #ifndef NO_TLS
 148         nixio_open_tls_crypto(L);
 149         nixio_open_tls_context(L);
 150         nixio_open_tls_socket(L);
 151 #endif
 152
 153         /* module version */
 154         lua_pushinteger(L, VERSION);
 155         lua_setfield(L, -2, "version");
 156
 157         /* some constants */
 158         lua_newtable(L);
 159
 160         lua_pushliteral(L, NIXIO_SEP);
 161         lua_setfield(L, -2, "sep");
 162
 163         lua_pushliteral(L, NIXIO_PATHSEP);
 164         lua_setfield(L, -2, "pathsep");
 165
 166         lua_pushinteger(L, NIXIO_BUFFERSIZE);
 167         lua_setfield(L, -2, "buffersize");
 168
 169         NIXIO_PUSH_CONSTANT(EACCES);
 170         NIXIO_PUSH_CONSTANT(EINTR);
 171         NIXIO_PUSH_CONSTANT(ENOSYS);
 172         NIXIO_PUSH_CONSTANT(EINVAL);
 173         NIXIO_PUSH_CONSTANT(EAGAIN);
 174         NIXIO_PUSH_CONSTANT(ENOMEM);
 175         NIXIO_PUSH_CONSTANT(ENOENT);
 176         NIXIO_PUSH_CONSTANT(ECHILD);
 177         NIXIO_PUSH_CONSTANT(EIO);
 178         NIXIO_PUSH_CONSTANT(EBADF);
 179         NIXIO_PUSH_CONSTANT(EFAULT);
 180         NIXIO_PUSH_CONSTANT(EFBIG);
 181         NIXIO_PUSH_CONSTANT(ENOSPC);
 182         NIXIO_PUSH_CONSTANT(EPIPE);
 183         NIXIO_PUSH_CONSTANT(ESPIPE);
 184         NIXIO_PUSH_CONSTANT(EISDIR);
 185         NIXIO_PUSH_CONSTANT(EPERM);
 186         NIXIO_PUSH_CONSTANT(EEXIST);
 187         NIXIO_PUSH_CONSTANT(EMFILE);
 188         NIXIO_PUSH_CONSTANT(ENAMETOOLONG);
 189         NIXIO_PUSH_CONSTANT(ENFILE);
 190         NIXIO_PUSH_CONSTANT(ENODEV);
 191         NIXIO_PUSH_CONSTANT(EXDEV);
 192         NIXIO_PUSH_CONSTANT(ENOTDIR);
 193         NIXIO_PUSH_CONSTANT(ENXIO);
 194         NIXIO_PUSH_CONSTANT(EROFS);
 195         NIXIO_PUSH_CONSTANT(EBUSY);
 196         NIXIO_PUSH_CONSTANT(ESRCH);
 197         NIXIO_PUSH_CONSTANT(SIGINT);
 198         NIXIO_PUSH_CONSTANT(SIGTERM);
 199         NIXIO_PUSH_CONSTANT(SIGSEGV);
 200
 201 #ifndef __WINNT__
 202         NIXIO_PUSH_CONSTANT(EALREADY);
 203         NIXIO_PUSH_CONSTANT(EINPROGRESS);
 204         NIXIO_PUSH_CONSTANT(EWOULDBLOCK);
 205         NIXIO_PUSH_CONSTANT(ELOOP);
 206         NIXIO_PUSH_CONSTANT(EOVERFLOW);
 207         NIXIO_PUSH_CONSTANT(ETXTBSY);
 208         NIXIO_PUSH_CONSTANT(EAFNOSUPPORT);
 209         NIXIO_PUSH_CONSTANT(ENOBUFS);
 210         NIXIO_PUSH_CONSTANT(EPROTONOSUPPORT);
 211         NIXIO_PUSH_CONSTANT(ENOPROTOOPT);
 212         NIXIO_PUSH_CONSTANT(EADDRINUSE);
 213         NIXIO_PUSH_CONSTANT(ENETDOWN);
 214         NIXIO_PUSH_CONSTANT(ENETUNREACH);
 215
 216         NIXIO_PUSH_CONSTANT(SIGALRM);
 217         NIXIO_PUSH_CONSTANT(SIGKILL);
 218         NIXIO_PUSH_CONSTANT(SIGHUP);
 219         NIXIO_PUSH_CONSTANT(SIGSTOP);
 220         NIXIO_PUSH_CONSTANT(SIGCONT);
 221         NIXIO_PUSH_CONSTANT(SIGCHLD);
 222         NIXIO_PUSH_CONSTANT(SIGQUIT);
 223         NIXIO_PUSH_CONSTANT(SIGUSR1);
 224         NIXIO_PUSH_CONSTANT(SIGUSR2);
 225         NIXIO_PUSH_CONSTANT(SIGIO);
 226         NIXIO_PUSH_CONSTANT(SIGURG);
 227         NIXIO_PUSH_CONSTANT(SIGPIPE);
 228
 229         lua_pushvalue(L, -1);
 230         lua_setfield(L, -3, "const_sock");
 231
 232         signal(SIGPIPE, SIG_IGN);
 233 #endif /* !__WINNT__ */
 234         lua_setfield(L, -2, "const");
 235
 236         /* remove meta table */
 237         lua_remove(L, -2);
 238
 239         return 1;
 240 }