moonbridge: 1d91c6eedf18 moonbridge

moonbridge

view moonbridge_io.c @ 87:1d91c6eedf18

Close and reset method for I/O library

author	jbe
date	Tue Apr 07 01:17:55 2015 +0200 (2015-04-07)
parents	9fa3a36733ff
children	fca51922b708

line source

2 #include <stdlib.h>

3 #include <unistd.h>

4 #include <stdint.h>

5 #include <errno.h>

6 #include <string.h>

7 #include <sys/socket.h>

8 #include <sys/select.h>

9 #include <fcntl.h>

11 #include <lua.h>

12 #include <lauxlib.h>

13 #include <lualib.h>

15 #define MOONBR_IO_MAXSTRERRORLEN 80

16 #define MOONBR_IO_READBUFLEN 4096

17 #define MOONBR_IO_WRITEBUFLEN 4096

19 #define moonbr_io_errmsg() \

20 char errmsg[MOONBR_IO_MAXSTRERRORLEN]; \

21 strerror_r(errno, errmsg, MOONBR_IO_MAXSTRERRORLEN)

23 #define MOONBR_IO_HANDLE_MT_REGKEY "moonbridge_io_handle"

24 #define MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY "moonbridge_io_handle_public"

26 typedef struct {

27 int fd;

28 int issocket;

29 int nonblocking;

30 int readerr;

31 int readbufcnt;

32 int writeerr;

33 size_t writeleft;

34 #if LUA_VERSION_NUM >= 503

35 lua_Integer writeqin;

36 lua_Integer writeqout;

37 #else

38 int writeqin;

39 int writeqout;

40 #endif

41 size_t writeqoff;

42 int writebufcnt;

43 char readbuf[MOONBR_IO_READBUFLEN];

44 char writebuf[MOONBR_IO_WRITEBUFLEN];

45 } moonbr_io_handle_t;

47 static void moonbr_io_handle_set_nonblocking(lua_State *L, moonbr_io_handle_t *handle, int nonblocking) {

48 if (handle->nonblocking != nonblocking) {

49 int flags;

50 flags = fcntl(handle->fd, F_GETFL, 0);

51 if (flags == -1) {

52 moonbr_io_errmsg();

53 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);

54 }

55 if (nonblocking) flags |= O_NONBLOCK;

56 else flags &= ~O_NONBLOCK;

57 if (fcntl(handle->fd, F_SETFL, flags) == -1) {

58 moonbr_io_errmsg();

59 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);

60 }

61 }

62 }

64 static void moonbr_io_handle_set_linger(lua_State *L, moonbr_io_handle_t *handle, int timeout) {

65 struct linger lingerval = { 0, };

66 if (!handle->issocket) return;

67 if (timeout >= 0) {

68 lingerval.l_onoff = 1;

69 lingerval.l_linger = timeout;

70 }

71 if (setsockopt(handle->fd, SOL_SOCKET, SO_LINGER, &lingerval, sizeof(lingerval))) {

72 moonbr_io_errmsg();

73 luaL_error(L, "Unexpected error in setsockopt call: %s", errmsg);

74 }

75 }

77 static int moonbr_io_read_impl(lua_State *L, int nonblocking, int drain) {

78 moonbr_io_handle_t *handle;

79 lua_Integer maxread;

80 const char *terminatorstr;

81 size_t terminatorlen;

82 char terminator;

83 luaL_Buffer luabuf;

84 size_t luabufcnt = 0;

85 int endcnt;

86 char *terminatorpos;

87 ssize_t result;

88 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

89 maxread = luaL_optinteger(L, 2, 0);

90 terminatorstr = luaL_optlstring(L, 3, "", &terminatorlen);

91 if (terminatorlen) {

92 luaL_argcheck(L, terminatorlen == 1, 3, "single byte expected");

93 terminator = terminatorstr[0];

94 }

95 lua_settop(L, 1); /* return handle on drain, terminator string may be garbage collected */

96 if (handle->fd < 0) luaL_error(L, "Attempt to read from a closed I/O handle");

97 if (handle->readerr) {

98 lua_pushnil(L);

99 lua_pushliteral(L, "Previous read error");

100 return 2;

101 }

102 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);

103 if (!drain) luaL_buffinit(L, &luabuf);

104 while (1) {

105 endcnt = -1;

106 if (maxread > 0 && handle->readbufcnt >= maxread - luabufcnt) {

107 endcnt = maxread - luabufcnt;

108 } else if (terminatorlen) {

109 terminatorpos = memchr(handle->readbuf, terminator, handle->readbufcnt);

110 if (terminatorpos) endcnt = 1 + (terminatorpos - handle->readbuf);

111 }

112 if (endcnt >= 0) {

113 if (!drain) {

114 luaL_addlstring(&luabuf, handle->readbuf, endcnt);

115 luaL_pushresult(&luabuf);

116 }

117 handle->readbufcnt -= endcnt;

118 memmove(handle->readbuf, handle->readbuf + endcnt, handle->readbufcnt);

119 return 1;

120 }

121 if (!drain) luaL_addlstring(&luabuf, handle->readbuf, handle->readbufcnt);

122 luabufcnt += handle->readbufcnt;

123 handle->readbufcnt = 0;

124 do {

125 result = read(handle->fd, handle->readbuf, MOONBR_IO_READBUFLEN);

126 } while (result < 0 && (errno == EINTR));

127 if (result == 0 || (nonblocking && result < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))) break;

128 if (result < 0) {

129 moonbr_io_errmsg();

130 handle->readerr = 1;

131 lua_pushnil(L);

132 lua_pushstring(L, errmsg);

133 return 2;

134 }

135 handle->readbufcnt += result;

136 }

137 if (!drain) {

138 luaL_addlstring(&luabuf, handle->readbuf, handle->readbufcnt);

139 luaL_pushresult(&luabuf);

140 }

141 handle->readbufcnt = 0;

142 return 1;

143 }

144

145 static int moonbr_io_read(lua_State *L) {

146 return moonbr_io_read_impl(L, 0, 0);

147 }

148

149 static int moonbr_io_read_nb(lua_State *L) {

150 return moonbr_io_read_impl(L, 1, 0);

151 }

152

153 static int moonbr_io_drain(lua_State *L) {

154 return moonbr_io_read_impl(L, 0, 1);

155 }

156

157 static int moonbr_io_drain_nb(lua_State *L) {

158 return moonbr_io_read_impl(L, 1, 1);

159 }

160

161 static int moonbr_io_write_impl(lua_State *L, int nonblocking, int flush) {

162 moonbr_io_handle_t *handle;

163 int i, top;

164 const char *str;

165 size_t strlen, strpos;

166 size_t written;

167 ssize_t result;

168 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

169 if (handle->fd < 0) luaL_error(L, "Attempt to write to a closed I/O handle");

170 if (handle->writeerr) {

171 lua_pushnil(L);

172 lua_pushliteral(L, "Previous write error");

173 return 2;

174 }

175 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);

176 top = lua_gettop(L);

177 lua_getuservalue(L, 1);

178 lua_getfield(L, -1, "writebuf");

179 for (i=2; i<=top; i++) {

180 luaL_checklstring(L, i, &strlen);

181 lua_pushvalue(L, i);

182 lua_rawseti(L, -2, handle->writeqin++);

183 handle->writeleft += strlen;

184 }

185 while (handle->writeqout != handle->writeqin) {

186 lua_rawgeti(L, -1, handle->writeqout);

187 str = lua_tolstring(L, -1, &strlen);

188 strpos = handle->writeqoff;

189 while (strpos < strlen) {

190 if (strlen - strpos < MOONBR_IO_WRITEBUFLEN - handle->writebufcnt) {

191 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, strlen - strpos);

192 handle->writebufcnt += strlen - strpos;

193 break;

194 } else {

195 written = 0;

196 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, MOONBR_IO_WRITEBUFLEN - handle->writebufcnt);

197 strpos += MOONBR_IO_WRITEBUFLEN - handle->writebufcnt;

198 while (written < MOONBR_IO_WRITEBUFLEN) {

199 result = write(handle->fd, handle->writebuf + written, MOONBR_IO_WRITEBUFLEN - written);

200 if (result < 0) {

201 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {

202 if (written) {

203 handle->writebufcnt -= written;

204 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);

205 }

206 handle->writeqoff = strpos;

207 goto moonbr_io_write_impl_block;

208 } else if (errno != EINTR) {

209 moonbr_io_errmsg();

210 handle->writeerr = 1;

211 lua_pushnil(L);

212 lua_pushstring(L, errmsg);

213 return 2;

214 }

215 } else {

216 written += result;

217 handle->writeleft -= result;

218 }

219 }

220 handle->writebufcnt = 0;

221 }

222 }

223 handle->writeqoff = 0;

224 lua_pop(L, 1);

225 lua_pushnil(L);

226 lua_rawseti(L, -2, handle->writeqout++);

227 }

228 if (flush) {

229 written = 0;

230 while (written < handle->writebufcnt) {

231 result = write(handle->fd, handle->writebuf + written, handle->writebufcnt - written);

232 if (result < 0) {

233 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {

234 if (written) {

235 handle->writebufcnt -= written;

236 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);

237 }

238 goto moonbr_io_write_impl_block;

239 } else if (errno != EINTR) {

240 moonbr_io_errmsg();

241 handle->writeerr = -1;

242 lua_pushnil(L);

243 lua_pushstring(L, errmsg);

244 return 2;

245 }

246 } else {

247 written += result;

248 handle->writeleft -= result;

249 }

250 }

251 handle->writebufcnt = 0;

252 if (nonblocking) lua_pushinteger(L, 0);

253 } else {

254 if (nonblocking) lua_pushinteger(L, handle->writeleft - handle->writebufcnt);

255 }

256 if (!nonblocking) lua_pushvalue(L, 1);

257 return 1;

258 moonbr_io_write_impl_block:

259 if (flush) lua_pushinteger(L, handle->writeleft);

260 else lua_pushinteger(L, handle->writeleft - handle->writebufcnt);

261 return 1;

262 }

263

264 static int moonbr_io_write(lua_State *L) {

265 return moonbr_io_write_impl(L, 0, 0);

266 }

267

268 static int moonbr_io_write_nb(lua_State *L) {

269 return moonbr_io_write_impl(L, 1, 0);

270 }

271

272 static int moonbr_io_flush(lua_State *L) {

273 return moonbr_io_write_impl(L, 0, 1);

274 }

275

276 static int moonbr_io_flush_nb(lua_State *L) {

277 return moonbr_io_write_impl(L, 1, 1);

278 }

279

280 static int moonbr_io_close(lua_State *L) {

281 moonbr_io_handle_t *handle;

282 int timeout;

283 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

284 timeout = luaL_optinteger(L, 2, -1);

285 if (handle->fd < 0) luaL_error(L, "Attempt to close a closed I/O handle");

286 if (timeout != 0) {

287 if (handle->writeleft) {

288 lua_pushcfunction(L, moonbr_io_flush);

289 lua_pushvalue(L, 1);

290 lua_call(L, 1, 2);

291 if (!lua_toboolean(L, -2)) {

292 close(handle->fd);

293 handle->fd = -1;

294 return 2;

295 }

296 }

297 moonbr_io_handle_set_linger(L, handle, timeout);

298 }

299 if (close(handle->fd)) {

300 moonbr_io_errmsg();

301 handle->fd = -1;

302 lua_pushnil(L);

303 lua_pushstring(L, errmsg);

304 return 2;

305 }

306 handle->fd = -1;

307 lua_pushboolean(L, 1);

308 return 1;

309

310 }

311

312 static int moonbr_io_reset(lua_State *L) {

313 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

314 lua_settop(L, 1);

315 lua_pushcfunction(L, moonbr_io_close);

316 lua_insert(L, 1);

317 lua_pushinteger(L, 0);

318 lua_call(L, 2, LUA_MULTRET);

319 return lua_gettop(L);

320 }

321

322 void moonbr_io_pushhandle(lua_State *L, int fd, int issocket) {

323 moonbr_io_handle_t *handle;

324 handle = lua_newuserdata(L, sizeof(moonbr_io_handle_t));

325 handle->fd = fd;

326 handle->issocket = issocket;

327 handle->nonblocking = -1;

328 handle->readerr = 0;

329 handle->readbufcnt = 0;

330 handle->writeerr = 0;

331 handle->writeleft = 0;

332 handle->writeqin = 0;

333 handle->writeqout = 0;

334 handle->writeqoff = 0;

335 handle->writebufcnt = 0;

336 moonbr_io_handle_set_linger(L, handle, 0);

337 luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);

338 lua_setmetatable(L, -2);

339 lua_newtable(L); // uservalue

340 lua_newtable(L);

341 lua_setfield(L, -2, "writebuf");

342 lua_newtable(L); // public

343 luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

344 lua_setmetatable(L, -2);

345 lua_setfield(L, -2, "public");

346 lua_setuservalue(L, -2);

347 }

348

349 static int moonbr_io_handleindex(lua_State *L) {

350 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

351 lua_getuservalue(L, 1);

352 lua_getfield(L, -1, "public");

353 lua_pushvalue(L, 2);

354 lua_gettable(L, -2);

355 return 1;

356 }

357

358 static int moonbr_io_handlenewindex(lua_State *L) {

359 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

360 lua_getuservalue(L, 1);

361 lua_getfield(L, -1, "public");

362 lua_pushvalue(L, 2);

363 lua_pushvalue(L, 3);

364 lua_settable(L, -3);

365 return 0;

366 }

367

368 static const struct luaL_Reg moonbr_io_handle_methods[] = {

369 {"read", moonbr_io_read},

370 {"read_nb", moonbr_io_read_nb},

371 {"drain", moonbr_io_drain},

372 {"drain_nb", moonbr_io_drain_nb},

373 {"write", moonbr_io_write},

374 {"write_nb", moonbr_io_write_nb},

375 {"flush", moonbr_io_flush},

376 {"flush_nb", moonbr_io_flush_nb},

377 {"close", moonbr_io_close},

378 {"reset", moonbr_io_reset},

379 {NULL, NULL}

380 };

381

382 static const struct luaL_Reg moonbr_io_handle_metamethods[] = {

383 {"__index", moonbr_io_handleindex},

384 {"__newindex", moonbr_io_handlenewindex},

385 {"__gc", moonbr_io_reset},

386 {NULL, NULL}

387 };

388

389 static const struct luaL_Reg moonbr_io_module_funcs[] = {

390 {NULL, NULL}

391 };

392

393 int luaopen_moonbridge_io(lua_State *L) {

394

395 lua_newtable(L); // module

396

397 lua_newtable(L); // public metatable

398 lua_newtable(L); // handle methods

399 luaL_setfuncs(L, moonbr_io_handle_methods, 0);

400 lua_pushvalue(L, -1);

401 lua_setfield(L, -4, "handle");

402 lua_setfield(L, -2, "__index");

403 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

404

405 lua_newtable(L); // handle metatable

406 luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);

407 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);

408

409 luaL_setfuncs(L, moonbr_io_module_funcs, 0);

410 return 1;

411

412 }

413