moonbridge: 697cdf8e2000 moonbridge

moonbridge

view moonbridge_io.c @ 83:697cdf8e2000

Code cleanup and fixes in optionally non-blocking write/write_nb method; Allow to mark I/O handles as closed

author	jbe
date	Mon Apr 06 15:02:15 2015 +0200 (2015-04-06)
parents	069ee3f5ab17
children	8a6e2a80fcad

line source

2 #include <stdlib.h>

3 #include <unistd.h>

4 #include <stdint.h>

5 #include <errno.h>

6 #include <string.h>

7 #include <stdio.h>

8 #include <time.h>

9 #include <sys/time.h>

10 #include <sys/socket.h>

11 #include <sys/select.h>

12 #include <fcntl.h>

14 #include <lua.h>

15 #include <lauxlib.h>

16 #include <lualib.h>

18 #define MOONBR_IO_MAXSTRERRORLEN 80

19 #define MOONBR_IO_WRITEBUFLEN 4096

21 #define moonbr_io_errmsg() \

22 char errmsg[MOONBR_IO_MAXSTRERRORLEN]; \

23 strerror_r(errno, errmsg, MOONBR_IO_MAXSTRERRORLEN)

26 #define MOONBR_IO_HANDLE_MT_REGKEY "moonbridge_io_handle"

27 #define MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY "moonbridge_io_handle_public"

29 typedef struct {

30 int fd;

31 int nonblocking;

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 writebuf[MOONBR_IO_WRITEBUFLEN];

44 } moonbr_io_handle_t;

46 int moonbr_io_isclosed(lua_State *L, int idx) {

47 moonbr_io_handle_t *handle;

48 handle = luaL_checkudata(L, idx, MOONBR_IO_HANDLE_MT_REGKEY);

49 return handle->fd < 0;

50 }

52 void moonbr_io_markclosed(lua_State *L, int idx) {

53 moonbr_io_handle_t *handle;

54 handle = luaL_checkudata(L, idx, MOONBR_IO_HANDLE_MT_REGKEY);

55 handle->fd = -1;

56 }

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

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

60 int flags;

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

62 if (flags == -1) {

63 moonbr_io_errmsg();

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

65 }

66 if (nonblocking) flags |= O_NONBLOCK;

67 else flags &= ~O_NONBLOCK;

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

69 moonbr_io_errmsg();

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

71 }

72 }

73 }

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

76 moonbr_io_handle_t *handle;

77 int i, top;

78 const char *str;

79 size_t strlen, strpos;

80 size_t written;

81 ssize_t result;

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

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

84 if (handle->writeerr) {

85 lua_pushnil(L);

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

87 return 2;

88 }

89 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);

90 if (!flush) top = lua_gettop(L);

91 lua_getuservalue(L, 1);

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

93 if (!flush) {

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

95 luaL_checklstring(L, i, &strlen);

96 lua_pushvalue(L, i);

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

98 handle->writeleft += strlen;

99 }

100 }

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

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

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

104 strpos = handle->writeqoff;

105 while (strpos < strlen) {

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

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

108 handle->writebufcnt += strlen - strpos;

109 break;

110 } else {

111 written = 0;

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

113 strpos += MOONBR_IO_WRITEBUFLEN - handle->writebufcnt;

114 while (written < MOONBR_IO_WRITEBUFLEN) {

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

116 if (result < 0) {

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

118 if (written) {

119 handle->writebufcnt -= written;

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

121 }

122 handle->writeqoff = strpos;

123 goto moonbr_io_write_impl_block;

124 } else if (errno != EINTR) {

125 moonbr_io_errmsg();

126 handle->writeerr = 1;

127 lua_pushnil(L);

128 lua_pushstring(L, errmsg);

129 return 2;

130 }

131 } else {

132 written += result;

133 handle->writeleft -= result;

134 }

135 }

136 handle->writebufcnt = 0;

137 }

138 }

139 handle->writeqoff = 0;

140 lua_pop(L, 1);

141 lua_pushnil(L);

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

143 }

144 if (flush) {

145 written = 0;

146 while (written < handle->writebufcnt) {

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

148 if (result < 0) {

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

150 if (written) {

151 handle->writebufcnt -= written;

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

153 }

154 goto moonbr_io_write_impl_block;

155 } else if (errno != EINTR) {

156 moonbr_io_errmsg();

157 handle->writeerr = -1;

158 lua_pushnil(L);

159 lua_pushstring(L, errmsg);

160 return 2;

161 }

162 } else {

163 written += result;

164 handle->writeleft -= result;

165 }

166 }

167 handle->writebufcnt = 0;

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

169 } else {

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

171 }

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

173 return 1;

174 moonbr_io_write_impl_block:

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

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

177 return 1;

178 }

179

180 static int moonbr_io_write(lua_State *L) {

181 return moonbr_io_write_impl(L, 0, 0);

182 }

183

184 static int moonbr_io_write_nb(lua_State *L) {

185 return moonbr_io_write_impl(L, 1, 0);

186 }

187

188 static int moonbr_io_flush(lua_State *L) {

189 return moonbr_io_write_impl(L, 0, 1);

190 }

191

192 static int moonbr_io_flush_nb(lua_State *L) {

193 return moonbr_io_write_impl(L, 1, 1);

194 }

195

196 static int moonbr_io_close(lua_State *L) {

197 moonbr_io_handle_t *handle;

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

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

200 if (handle->writeleft) {

201 lua_pushcfunction(L, moonbr_io_flush);

202 lua_pushvalue(L, 1);

203 lua_call(L, 1, 2);

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

205 close(handle->fd);

206 handle->fd = -1;

207 return 2;

208 }

209 }

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

211 moonbr_io_errmsg();

212 handle->fd = -1;

213 lua_pushnil(L);

214 lua_pushstring(L, errmsg);

215 return 2;

216 }

217 handle->fd = -1;

218 lua_pushboolean(L, 1);

219 return 1;

220 }

221

222 void moonbr_io_pushhandle(lua_State *L, int fd, int gc_idx) {

223 moonbr_io_handle_t *handle;

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

225 handle->fd = fd;

226 handle->nonblocking = -1;

227 handle->writeerr = 0;

228 handle->writeleft = 0;

229 handle->writeqin = 0;

230 handle->writeqout = 0;

231 handle->writeqoff = 0;

232 handle->writebufcnt = 0;

233 luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);

234 lua_setmetatable(L, -2);

235 lua_newtable(L); // uservalue

236 lua_newtable(L);

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

238 if (gc_idx) lua_pushvalue(L, gc_idx);

239 else lua_pushcfunction(L, moonbr_io_close);

240 lua_setfield(L, -2, "gc");

241 lua_newtable(L); // public

242 luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

243 lua_setmetatable(L, -2);

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

245 lua_setuservalue(L, -2);

246 }

247

248 static int moonbr_io_handleindex(lua_State *L) {

249 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

250 lua_getuservalue(L, 1);

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

252 lua_pushvalue(L, 2);

253 lua_gettable(L, -2);

254 return 1;

255 }

256

257 static int moonbr_io_handlenewindex(lua_State *L) {

258 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);

259 lua_getuservalue(L, 1);

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

261 lua_pushvalue(L, 2);

262 lua_pushvalue(L, 3);

263 lua_settable(L, -3);

264 return 0;

265 }

266

267 static int moonbr_io_handlegc(lua_State *L) {

268 moonbr_io_handle_t *handle;

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

270 if (handle->fd >= 0) {

271 lua_getuservalue(L, 1);

272 lua_getfield(L, -1, "gc");

273 lua_pushvalue(L, 1);

274 lua_call(L, 1, 0);

275 }

276 return 0;

277 }

278

279 static int moonbr_io_getdummy(lua_State *L) {

280 moonbr_io_pushhandle(L, 2, 0);

281 return 1;

282 }

283

284 static const struct luaL_Reg moonbr_io_handle_methods[] = {

285 {"close", moonbr_io_close},

286 {"write", moonbr_io_write},

287 {"write_nb", moonbr_io_write_nb},

288 {"flush", moonbr_io_flush},

289 {"flush_nb", moonbr_io_flush_nb},

290 {NULL, NULL}

291 };

292

293 static const struct luaL_Reg moonbr_io_handle_metamethods[] = {

294 {"__index", moonbr_io_handleindex},

295 {"__newindex", moonbr_io_handlenewindex},

296 {"__gc", moonbr_io_handlegc},

297 {NULL, NULL}

298 };

299

300 static const struct luaL_Reg moonbr_io_module_funcs[] = {

301 {"getdummy", moonbr_io_getdummy},

302 {NULL, NULL}

303 };

304

305 int luaopen_moonbridge_io(lua_State *L) {

306

307 lua_newtable(L); // module

308

309 lua_newtable(L); // public metatable

310 lua_newtable(L); // handle methods

311 luaL_setfuncs(L, moonbr_io_handle_methods, 0);

312 lua_pushvalue(L, -1);

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

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

315 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);

316

317 lua_newtable(L); // handle metatable

318 luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);

319 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);

320

321 luaL_setfuncs(L, moonbr_io_module_funcs, 0);

322 return 1;

323

324 }

325