moonbridge

annotate moonbridge_io.c @ 85:ef552870f1b6

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Implementation of read and read_nb in I/O module
author jbe
date Mon Apr 06 22:58:51 2015 +0200 (2015-04-06)
parents 8a6e2a80fcad
children 9fa3a36733ff
rev   line source
jbe@79 1
jbe@79 2 #include <stdlib.h>
jbe@79 3 #include <unistd.h>
jbe@79 4 #include <stdint.h>
jbe@79 5 #include <errno.h>
jbe@79 6 #include <string.h>
jbe@79 7 #include <stdio.h>
jbe@79 8 #include <time.h>
jbe@79 9 #include <sys/time.h>
jbe@79 10 #include <sys/socket.h>
jbe@79 11 #include <sys/select.h>
jbe@81 12 #include <fcntl.h>
jbe@79 13
jbe@79 14 #include <lua.h>
jbe@79 15 #include <lauxlib.h>
jbe@79 16 #include <lualib.h>
jbe@79 17
jbe@80 18 #define MOONBR_IO_MAXSTRERRORLEN 80
jbe@85 19 #define MOONBR_IO_READBUFLEN 4096
jbe@80 20 #define MOONBR_IO_WRITEBUFLEN 4096
jbe@80 21
jbe@80 22 #define moonbr_io_errmsg() \
jbe@80 23 char errmsg[MOONBR_IO_MAXSTRERRORLEN]; \
jbe@80 24 strerror_r(errno, errmsg, MOONBR_IO_MAXSTRERRORLEN)
jbe@80 25
jbe@80 26
jbe@79 27 #define MOONBR_IO_HANDLE_MT_REGKEY "moonbridge_io_handle"
jbe@79 28 #define MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY "moonbridge_io_handle_public"
jbe@79 29
jbe@79 30 typedef struct {
jbe@79 31 int fd;
jbe@84 32 int issocket;
jbe@81 33 int nonblocking;
jbe@85 34 int readerr;
jbe@85 35 int readbufcnt;
jbe@81 36 int writeerr;
jbe@83 37 size_t writeleft;
jbe@83 38 #if LUA_VERSION_NUM >= 503
jbe@83 39 lua_Integer writeqin;
jbe@83 40 lua_Integer writeqout;
jbe@83 41 #else
jbe@83 42 int writeqin;
jbe@83 43 int writeqout;
jbe@83 44 #endif
jbe@83 45 size_t writeqoff;
jbe@81 46 int writebufcnt;
jbe@85 47 char readbuf[MOONBR_IO_READBUFLEN];
jbe@80 48 char writebuf[MOONBR_IO_WRITEBUFLEN];
jbe@79 49 } moonbr_io_handle_t;
jbe@79 50
jbe@81 51 static void moonbr_io_handle_set_nonblocking(lua_State *L, moonbr_io_handle_t *handle, int nonblocking) {
jbe@81 52 if (handle->nonblocking != nonblocking) {
jbe@81 53 int flags;
jbe@81 54 flags = fcntl(handle->fd, F_GETFL, 0);
jbe@81 55 if (flags == -1) {
jbe@81 56 moonbr_io_errmsg();
jbe@81 57 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
jbe@81 58 }
jbe@81 59 if (nonblocking) flags |= O_NONBLOCK;
jbe@81 60 else flags &= ~O_NONBLOCK;
jbe@81 61 if (fcntl(handle->fd, F_SETFL, flags) == -1) {
jbe@81 62 moonbr_io_errmsg();
jbe@81 63 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
jbe@81 64 }
jbe@81 65 }
jbe@81 66 }
jbe@81 67
jbe@85 68 static int moonbr_io_read_impl(lua_State *L, int nonblocking) {
jbe@85 69 moonbr_io_handle_t *handle;
jbe@85 70 lua_Integer maxread;
jbe@85 71 const char *terminatorstr;
jbe@85 72 size_t terminatorlen;
jbe@85 73 char terminator;
jbe@85 74 luaL_Buffer luabuf;
jbe@85 75 size_t luabufcnt = 0;
jbe@85 76 int restcnt;
jbe@85 77 char *terminatorpos;
jbe@85 78 ssize_t result;
jbe@85 79 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@85 80 maxread = luaL_optinteger(L, 2, 0);
jbe@85 81 terminatorstr = luaL_optlstring(L, 3, "", &terminatorlen);
jbe@85 82 if (terminatorlen) {
jbe@85 83 luaL_argcheck(L, terminatorlen == 1, 3, "single byte expected");
jbe@85 84 terminator = terminatorstr[0];
jbe@85 85 }
jbe@85 86 if (handle->fd < 0) luaL_error(L, "Attempt to read from a closed I/O handle");
jbe@85 87 if (handle->readerr) {
jbe@85 88 lua_pushnil(L);
jbe@85 89 lua_pushliteral(L, "Previous read error");
jbe@85 90 return 2;
jbe@85 91 }
jbe@85 92 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);
jbe@85 93 luaL_buffinit(L, &luabuf);
jbe@85 94 while (1) {
jbe@85 95 restcnt = -1;
jbe@85 96 if (maxread > 0 && handle->readbufcnt >= maxread - luabufcnt) {
jbe@85 97 restcnt = maxread - luabufcnt;
jbe@85 98 } else if (terminatorlen) {
jbe@85 99 terminatorpos = memchr(handle->readbuf, terminator, handle->readbufcnt);
jbe@85 100 if (terminatorpos) restcnt = 1 + (terminatorpos - handle->readbuf);
jbe@85 101 }
jbe@85 102 if (restcnt >= 0) {
jbe@85 103 luaL_addlstring(&luabuf, handle->readbuf, restcnt);
jbe@85 104 handle->readbufcnt -= restcnt;
jbe@85 105 memmove(handle->readbuf, handle->readbuf + restcnt, handle->readbufcnt);
jbe@85 106 luaL_pushresult(&luabuf);
jbe@85 107 return 1;
jbe@85 108 }
jbe@85 109 luaL_addlstring(&luabuf, handle->readbuf, handle->readbufcnt);
jbe@85 110 luabufcnt += handle->readbufcnt;
jbe@85 111 handle->readbufcnt = 0;
jbe@85 112 do {
jbe@85 113 result = read(handle->fd, handle->readbuf, MOONBR_IO_READBUFLEN);
jbe@85 114 } while (result < 0 && (errno == EINTR));
jbe@85 115 if (result == 0 || (nonblocking && result < 0 && (errno == EAGAIN || errno == EWOULDBLOCK))) break;
jbe@85 116 if (result < 0) {
jbe@85 117 moonbr_io_errmsg();
jbe@85 118 handle->readerr = 1;
jbe@85 119 lua_pushnil(L);
jbe@85 120 lua_pushstring(L, errmsg);
jbe@85 121 return 2;
jbe@85 122 }
jbe@85 123 handle->readbufcnt += result;
jbe@85 124 }
jbe@85 125 luaL_addlstring(&luabuf, handle->readbuf, handle->readbufcnt);
jbe@85 126 handle->readbufcnt = 0;
jbe@85 127 luaL_pushresult(&luabuf);
jbe@85 128 return 1;
jbe@85 129 }
jbe@85 130
jbe@85 131 static int moonbr_io_read(lua_State *L) {
jbe@85 132 return moonbr_io_read_impl(L, 0);
jbe@85 133 }
jbe@85 134
jbe@85 135 static int moonbr_io_read_nb(lua_State *L) {
jbe@85 136 return moonbr_io_read_impl(L, 1);
jbe@85 137 }
jbe@85 138
jbe@81 139 static int moonbr_io_write_impl(lua_State *L, int nonblocking, int flush) {
jbe@80 140 moonbr_io_handle_t *handle;
jbe@80 141 int i, top;
jbe@80 142 const char *str;
jbe@81 143 size_t strlen, strpos;
jbe@80 144 size_t written;
jbe@80 145 ssize_t result;
jbe@80 146 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@83 147 if (handle->fd < 0) luaL_error(L, "Attempt to write to a closed I/O handle");
jbe@81 148 if (handle->writeerr) {
jbe@80 149 lua_pushnil(L);
jbe@80 150 lua_pushliteral(L, "Previous write error");
jbe@80 151 return 2;
jbe@80 152 }
jbe@81 153 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);
jbe@84 154 top = lua_gettop(L);
jbe@81 155 lua_getuservalue(L, 1);
jbe@81 156 lua_getfield(L, -1, "writebuf");
jbe@84 157 for (i=2; i<=top; i++) {
jbe@84 158 luaL_checklstring(L, i, &strlen);
jbe@84 159 lua_pushvalue(L, i);
jbe@84 160 lua_rawseti(L, -2, handle->writeqin++);
jbe@84 161 handle->writeleft += strlen;
jbe@81 162 }
jbe@83 163 while (handle->writeqout != handle->writeqin) {
jbe@83 164 lua_rawgeti(L, -1, handle->writeqout);
jbe@81 165 str = lua_tolstring(L, -1, &strlen);
jbe@81 166 strpos = handle->writeqoff;
jbe@81 167 while (strpos < strlen) {
jbe@81 168 if (strlen - strpos < MOONBR_IO_WRITEBUFLEN - handle->writebufcnt) {
jbe@81 169 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, strlen - strpos);
jbe@81 170 handle->writebufcnt += strlen - strpos;
jbe@80 171 break;
jbe@80 172 } else {
jbe@80 173 written = 0;
jbe@81 174 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, MOONBR_IO_WRITEBUFLEN - handle->writebufcnt);
jbe@81 175 strpos += MOONBR_IO_WRITEBUFLEN - handle->writebufcnt;
jbe@80 176 while (written < MOONBR_IO_WRITEBUFLEN) {
jbe@80 177 result = write(handle->fd, handle->writebuf + written, MOONBR_IO_WRITEBUFLEN - written);
jbe@80 178 if (result < 0) {
jbe@81 179 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
jbe@81 180 if (written) {
jbe@81 181 handle->writebufcnt -= written;
jbe@81 182 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
jbe@81 183 }
jbe@81 184 handle->writeqoff = strpos;
jbe@81 185 goto moonbr_io_write_impl_block;
jbe@81 186 } else if (errno != EINTR) {
jbe@80 187 moonbr_io_errmsg();
jbe@81 188 handle->writeerr = 1;
jbe@80 189 lua_pushnil(L);
jbe@80 190 lua_pushstring(L, errmsg);
jbe@80 191 return 2;
jbe@80 192 }
jbe@80 193 } else {
jbe@80 194 written += result;
jbe@81 195 handle->writeleft -= result;
jbe@80 196 }
jbe@80 197 }
jbe@81 198 handle->writebufcnt = 0;
jbe@80 199 }
jbe@80 200 }
jbe@81 201 handle->writeqoff = 0;
jbe@81 202 lua_pop(L, 1);
jbe@81 203 lua_pushnil(L);
jbe@83 204 lua_rawseti(L, -2, handle->writeqout++);
jbe@80 205 }
jbe@81 206 if (flush) {
jbe@81 207 written = 0;
jbe@81 208 while (written < handle->writebufcnt) {
jbe@81 209 result = write(handle->fd, handle->writebuf + written, handle->writebufcnt - written);
jbe@81 210 if (result < 0) {
jbe@81 211 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
jbe@81 212 if (written) {
jbe@81 213 handle->writebufcnt -= written;
jbe@81 214 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
jbe@81 215 }
jbe@81 216 goto moonbr_io_write_impl_block;
jbe@81 217 } else if (errno != EINTR) {
jbe@81 218 moonbr_io_errmsg();
jbe@81 219 handle->writeerr = -1;
jbe@81 220 lua_pushnil(L);
jbe@81 221 lua_pushstring(L, errmsg);
jbe@81 222 return 2;
jbe@81 223 }
jbe@81 224 } else {
jbe@81 225 written += result;
jbe@81 226 handle->writeleft -= result;
jbe@81 227 }
jbe@81 228 }
jbe@81 229 handle->writebufcnt = 0;
jbe@82 230 if (nonblocking) lua_pushinteger(L, 0);
jbe@81 231 } else {
jbe@82 232 if (nonblocking) lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
jbe@81 233 }
jbe@82 234 if (!nonblocking) lua_pushvalue(L, 1);
jbe@80 235 return 1;
jbe@81 236 moonbr_io_write_impl_block:
jbe@81 237 if (flush) lua_pushinteger(L, handle->writeleft);
jbe@81 238 else lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
jbe@81 239 return 1;
jbe@81 240 }
jbe@81 241
jbe@81 242 static int moonbr_io_write(lua_State *L) {
jbe@81 243 return moonbr_io_write_impl(L, 0, 0);
jbe@81 244 }
jbe@81 245
jbe@81 246 static int moonbr_io_write_nb(lua_State *L) {
jbe@81 247 return moonbr_io_write_impl(L, 1, 0);
jbe@80 248 }
jbe@80 249
jbe@80 250 static int moonbr_io_flush(lua_State *L) {
jbe@81 251 return moonbr_io_write_impl(L, 0, 1);
jbe@81 252 }
jbe@81 253
jbe@81 254 static int moonbr_io_flush_nb(lua_State *L) {
jbe@81 255 return moonbr_io_write_impl(L, 1, 1);
jbe@80 256 }
jbe@80 257
jbe@84 258 static int moonbr_io_close_impl(lua_State *L, int clean) {
jbe@83 259 moonbr_io_handle_t *handle;
jbe@83 260 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@83 261 if (handle->fd < 0) luaL_error(L, "Attempt to close a closed I/O handle");
jbe@84 262 if (clean && handle->writeleft) {
jbe@83 263 lua_pushcfunction(L, moonbr_io_flush);
jbe@83 264 lua_pushvalue(L, 1);
jbe@83 265 lua_call(L, 1, 2);
jbe@83 266 if (!lua_toboolean(L, -2)) {
jbe@83 267 close(handle->fd);
jbe@83 268 handle->fd = -1;
jbe@83 269 return 2;
jbe@83 270 }
jbe@83 271 }
jbe@83 272 if (close(handle->fd)) {
jbe@83 273 moonbr_io_errmsg();
jbe@83 274 handle->fd = -1;
jbe@83 275 lua_pushnil(L);
jbe@83 276 lua_pushstring(L, errmsg);
jbe@83 277 return 2;
jbe@83 278 }
jbe@83 279 handle->fd = -1;
jbe@83 280 lua_pushboolean(L, 1);
jbe@83 281 return 1;
jbe@84 282
jbe@83 283 }
jbe@83 284
jbe@84 285 static int moonbr_io_reset(lua_State *L) {
jbe@84 286 return moonbr_io_close_impl(L, 0);
jbe@84 287 }
jbe@84 288
jbe@84 289 static int moonbr_io_close(lua_State *L) {
jbe@84 290 return moonbr_io_close_impl(L, 1);
jbe@84 291 }
jbe@84 292
jbe@84 293 void moonbr_io_pushhandle(lua_State *L, int fd, int issocket) {
jbe@79 294 moonbr_io_handle_t *handle;
jbe@79 295 handle = lua_newuserdata(L, sizeof(moonbr_io_handle_t));
jbe@79 296 handle->fd = fd;
jbe@84 297 handle->issocket = issocket;
jbe@81 298 handle->nonblocking = -1;
jbe@85 299 handle->readerr = 0;
jbe@85 300 handle->readbufcnt = 0;
jbe@81 301 handle->writeerr = 0;
jbe@81 302 handle->writeleft = 0;
jbe@83 303 handle->writeqin = 0;
jbe@83 304 handle->writeqout = 0;
jbe@81 305 handle->writeqoff = 0;
jbe@81 306 handle->writebufcnt = 0;
jbe@79 307 luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 308 lua_setmetatable(L, -2);
jbe@79 309 lua_newtable(L); // uservalue
jbe@81 310 lua_newtable(L);
jbe@81 311 lua_setfield(L, -2, "writebuf");
jbe@79 312 lua_newtable(L); // public
jbe@79 313 luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
jbe@79 314 lua_setmetatable(L, -2);
jbe@79 315 lua_setfield(L, -2, "public");
jbe@79 316 lua_setuservalue(L, -2);
jbe@79 317 }
jbe@79 318
jbe@79 319 static int moonbr_io_handleindex(lua_State *L) {
jbe@80 320 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 321 lua_getuservalue(L, 1);
jbe@79 322 lua_getfield(L, -1, "public");
jbe@79 323 lua_pushvalue(L, 2);
jbe@79 324 lua_gettable(L, -2);
jbe@79 325 return 1;
jbe@79 326 }
jbe@79 327
jbe@79 328 static int moonbr_io_handlenewindex(lua_State *L) {
jbe@80 329 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 330 lua_getuservalue(L, 1);
jbe@79 331 lua_getfield(L, -1, "public");
jbe@79 332 lua_pushvalue(L, 2);
jbe@79 333 lua_pushvalue(L, 3);
jbe@79 334 lua_settable(L, -3);
jbe@79 335 return 0;
jbe@79 336 }
jbe@79 337
jbe@80 338 static int moonbr_io_handlegc(lua_State *L) {
jbe@80 339 moonbr_io_handle_t *handle;
jbe@80 340 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@80 341 if (handle->fd >= 0) {
jbe@80 342 lua_getuservalue(L, 1);
jbe@80 343 lua_getfield(L, -1, "gc");
jbe@80 344 lua_pushvalue(L, 1);
jbe@80 345 lua_call(L, 1, 0);
jbe@80 346 }
jbe@80 347 return 0;
jbe@80 348 }
jbe@80 349
jbe@79 350 static int moonbr_io_getdummy(lua_State *L) {
jbe@85 351 moonbr_io_pushhandle(L, 0, 0);
jbe@79 352 return 1;
jbe@79 353 }
jbe@79 354
jbe@79 355 static const struct luaL_Reg moonbr_io_handle_methods[] = {
jbe@85 356 {"read", moonbr_io_read},
jbe@85 357 {"read_nb", moonbr_io_read_nb},
jbe@80 358 {"write", moonbr_io_write},
jbe@81 359 {"write_nb", moonbr_io_write_nb},
jbe@80 360 {"flush", moonbr_io_flush},
jbe@81 361 {"flush_nb", moonbr_io_flush_nb},
jbe@85 362 {"reset", moonbr_io_reset},
jbe@85 363 {"close", moonbr_io_close},
jbe@79 364 {NULL, NULL}
jbe@79 365 };
jbe@79 366
jbe@79 367 static const struct luaL_Reg moonbr_io_handle_metamethods[] = {
jbe@79 368 {"__index", moonbr_io_handleindex},
jbe@79 369 {"__newindex", moonbr_io_handlenewindex},
jbe@80 370 {"__gc", moonbr_io_handlegc},
jbe@79 371 {NULL, NULL}
jbe@79 372 };
jbe@79 373
jbe@79 374 static const struct luaL_Reg moonbr_io_module_funcs[] = {
jbe@79 375 {"getdummy", moonbr_io_getdummy},
jbe@79 376 {NULL, NULL}
jbe@79 377 };
jbe@79 378
jbe@79 379 int luaopen_moonbridge_io(lua_State *L) {
jbe@79 380
jbe@80 381 lua_newtable(L); // module
jbe@80 382
jbe@79 383 lua_newtable(L); // public metatable
jbe@79 384 lua_newtable(L); // handle methods
jbe@79 385 luaL_setfuncs(L, moonbr_io_handle_methods, 0);
jbe@80 386 lua_pushvalue(L, -1);
jbe@80 387 lua_setfield(L, -4, "handle");
jbe@79 388 lua_setfield(L, -2, "__index");
jbe@79 389 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
jbe@79 390
jbe@79 391 lua_newtable(L); // handle metatable
jbe@79 392 luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);
jbe@79 393 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 394
jbe@79 395 luaL_setfuncs(L, moonbr_io_module_funcs, 0);
jbe@79 396 return 1;
jbe@79 397
jbe@79 398 }
jbe@79 399

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