moonbridge

annotate moonbridge_io.c @ 83:697cdf8e2000

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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
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@80 19 #define MOONBR_IO_WRITEBUFLEN 4096
jbe@80 20
jbe@80 21 #define moonbr_io_errmsg() \
jbe@80 22 char errmsg[MOONBR_IO_MAXSTRERRORLEN]; \
jbe@80 23 strerror_r(errno, errmsg, MOONBR_IO_MAXSTRERRORLEN)
jbe@80 24
jbe@80 25
jbe@79 26 #define MOONBR_IO_HANDLE_MT_REGKEY "moonbridge_io_handle"
jbe@79 27 #define MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY "moonbridge_io_handle_public"
jbe@79 28
jbe@79 29 typedef struct {
jbe@79 30 int fd;
jbe@81 31 int nonblocking;
jbe@81 32 int writeerr;
jbe@83 33 size_t writeleft;
jbe@83 34 #if LUA_VERSION_NUM >= 503
jbe@83 35 lua_Integer writeqin;
jbe@83 36 lua_Integer writeqout;
jbe@83 37 #else
jbe@83 38 int writeqin;
jbe@83 39 int writeqout;
jbe@83 40 #endif
jbe@83 41 size_t writeqoff;
jbe@81 42 int writebufcnt;
jbe@80 43 char writebuf[MOONBR_IO_WRITEBUFLEN];
jbe@79 44 } moonbr_io_handle_t;
jbe@79 45
jbe@83 46 int moonbr_io_isclosed(lua_State *L, int idx) {
jbe@83 47 moonbr_io_handle_t *handle;
jbe@83 48 handle = luaL_checkudata(L, idx, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@83 49 return handle->fd < 0;
jbe@83 50 }
jbe@83 51
jbe@83 52 void moonbr_io_markclosed(lua_State *L, int idx) {
jbe@83 53 moonbr_io_handle_t *handle;
jbe@83 54 handle = luaL_checkudata(L, idx, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@83 55 handle->fd = -1;
jbe@83 56 }
jbe@83 57
jbe@81 58 static void moonbr_io_handle_set_nonblocking(lua_State *L, moonbr_io_handle_t *handle, int nonblocking) {
jbe@81 59 if (handle->nonblocking != nonblocking) {
jbe@81 60 int flags;
jbe@81 61 flags = fcntl(handle->fd, F_GETFL, 0);
jbe@81 62 if (flags == -1) {
jbe@81 63 moonbr_io_errmsg();
jbe@81 64 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
jbe@81 65 }
jbe@81 66 if (nonblocking) flags |= O_NONBLOCK;
jbe@81 67 else flags &= ~O_NONBLOCK;
jbe@81 68 if (fcntl(handle->fd, F_SETFL, flags) == -1) {
jbe@81 69 moonbr_io_errmsg();
jbe@81 70 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
jbe@81 71 }
jbe@81 72 }
jbe@81 73 }
jbe@81 74
jbe@81 75 static int moonbr_io_write_impl(lua_State *L, int nonblocking, int flush) {
jbe@80 76 moonbr_io_handle_t *handle;
jbe@80 77 int i, top;
jbe@80 78 const char *str;
jbe@81 79 size_t strlen, strpos;
jbe@80 80 size_t written;
jbe@80 81 ssize_t result;
jbe@80 82 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@83 83 if (handle->fd < 0) luaL_error(L, "Attempt to write to a closed I/O handle");
jbe@81 84 if (handle->writeerr) {
jbe@80 85 lua_pushnil(L);
jbe@80 86 lua_pushliteral(L, "Previous write error");
jbe@80 87 return 2;
jbe@80 88 }
jbe@81 89 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);
jbe@81 90 if (!flush) top = lua_gettop(L);
jbe@81 91 lua_getuservalue(L, 1);
jbe@81 92 lua_getfield(L, -1, "writebuf");
jbe@81 93 if (!flush) {
jbe@81 94 for (i=2; i<=top; i++) {
jbe@81 95 luaL_checklstring(L, i, &strlen);
jbe@81 96 lua_pushvalue(L, i);
jbe@83 97 lua_rawseti(L, -2, handle->writeqin++);
jbe@81 98 handle->writeleft += strlen;
jbe@81 99 }
jbe@81 100 }
jbe@83 101 while (handle->writeqout != handle->writeqin) {
jbe@83 102 lua_rawgeti(L, -1, handle->writeqout);
jbe@81 103 str = lua_tolstring(L, -1, &strlen);
jbe@81 104 strpos = handle->writeqoff;
jbe@81 105 while (strpos < strlen) {
jbe@81 106 if (strlen - strpos < MOONBR_IO_WRITEBUFLEN - handle->writebufcnt) {
jbe@81 107 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, strlen - strpos);
jbe@81 108 handle->writebufcnt += strlen - strpos;
jbe@80 109 break;
jbe@80 110 } else {
jbe@80 111 written = 0;
jbe@81 112 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, MOONBR_IO_WRITEBUFLEN - handle->writebufcnt);
jbe@81 113 strpos += MOONBR_IO_WRITEBUFLEN - handle->writebufcnt;
jbe@80 114 while (written < MOONBR_IO_WRITEBUFLEN) {
jbe@80 115 result = write(handle->fd, handle->writebuf + written, MOONBR_IO_WRITEBUFLEN - written);
jbe@80 116 if (result < 0) {
jbe@81 117 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
jbe@81 118 if (written) {
jbe@81 119 handle->writebufcnt -= written;
jbe@81 120 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
jbe@81 121 }
jbe@81 122 handle->writeqoff = strpos;
jbe@81 123 goto moonbr_io_write_impl_block;
jbe@81 124 } else if (errno != EINTR) {
jbe@80 125 moonbr_io_errmsg();
jbe@81 126 handle->writeerr = 1;
jbe@80 127 lua_pushnil(L);
jbe@80 128 lua_pushstring(L, errmsg);
jbe@80 129 return 2;
jbe@80 130 }
jbe@80 131 } else {
jbe@80 132 written += result;
jbe@81 133 handle->writeleft -= result;
jbe@80 134 }
jbe@80 135 }
jbe@81 136 handle->writebufcnt = 0;
jbe@80 137 }
jbe@80 138 }
jbe@81 139 handle->writeqoff = 0;
jbe@81 140 lua_pop(L, 1);
jbe@81 141 lua_pushnil(L);
jbe@83 142 lua_rawseti(L, -2, handle->writeqout++);
jbe@80 143 }
jbe@81 144 if (flush) {
jbe@81 145 written = 0;
jbe@81 146 while (written < handle->writebufcnt) {
jbe@81 147 result = write(handle->fd, handle->writebuf + written, handle->writebufcnt - written);
jbe@81 148 if (result < 0) {
jbe@81 149 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
jbe@81 150 if (written) {
jbe@81 151 handle->writebufcnt -= written;
jbe@81 152 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
jbe@81 153 }
jbe@81 154 goto moonbr_io_write_impl_block;
jbe@81 155 } else if (errno != EINTR) {
jbe@81 156 moonbr_io_errmsg();
jbe@81 157 handle->writeerr = -1;
jbe@81 158 lua_pushnil(L);
jbe@81 159 lua_pushstring(L, errmsg);
jbe@81 160 return 2;
jbe@81 161 }
jbe@81 162 } else {
jbe@81 163 written += result;
jbe@81 164 handle->writeleft -= result;
jbe@81 165 }
jbe@81 166 }
jbe@81 167 handle->writebufcnt = 0;
jbe@82 168 if (nonblocking) lua_pushinteger(L, 0);
jbe@81 169 } else {
jbe@82 170 if (nonblocking) lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
jbe@81 171 }
jbe@82 172 if (!nonblocking) lua_pushvalue(L, 1);
jbe@80 173 return 1;
jbe@81 174 moonbr_io_write_impl_block:
jbe@81 175 if (flush) lua_pushinteger(L, handle->writeleft);
jbe@81 176 else lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
jbe@81 177 return 1;
jbe@81 178 }
jbe@81 179
jbe@81 180 static int moonbr_io_write(lua_State *L) {
jbe@81 181 return moonbr_io_write_impl(L, 0, 0);
jbe@81 182 }
jbe@81 183
jbe@81 184 static int moonbr_io_write_nb(lua_State *L) {
jbe@81 185 return moonbr_io_write_impl(L, 1, 0);
jbe@80 186 }
jbe@80 187
jbe@80 188 static int moonbr_io_flush(lua_State *L) {
jbe@81 189 return moonbr_io_write_impl(L, 0, 1);
jbe@81 190 }
jbe@81 191
jbe@81 192 static int moonbr_io_flush_nb(lua_State *L) {
jbe@81 193 return moonbr_io_write_impl(L, 1, 1);
jbe@80 194 }
jbe@80 195
jbe@83 196 static int moonbr_io_close(lua_State *L) {
jbe@83 197 moonbr_io_handle_t *handle;
jbe@83 198 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@83 199 if (handle->fd < 0) luaL_error(L, "Attempt to close a closed I/O handle");
jbe@83 200 if (handle->writeleft) {
jbe@83 201 lua_pushcfunction(L, moonbr_io_flush);
jbe@83 202 lua_pushvalue(L, 1);
jbe@83 203 lua_call(L, 1, 2);
jbe@83 204 if (!lua_toboolean(L, -2)) {
jbe@83 205 close(handle->fd);
jbe@83 206 handle->fd = -1;
jbe@83 207 return 2;
jbe@83 208 }
jbe@83 209 }
jbe@83 210 if (close(handle->fd)) {
jbe@83 211 moonbr_io_errmsg();
jbe@83 212 handle->fd = -1;
jbe@83 213 lua_pushnil(L);
jbe@83 214 lua_pushstring(L, errmsg);
jbe@83 215 return 2;
jbe@83 216 }
jbe@83 217 handle->fd = -1;
jbe@83 218 lua_pushboolean(L, 1);
jbe@83 219 return 1;
jbe@83 220 }
jbe@83 221
jbe@80 222 void moonbr_io_pushhandle(lua_State *L, int fd, int gc_idx) {
jbe@79 223 moonbr_io_handle_t *handle;
jbe@79 224 handle = lua_newuserdata(L, sizeof(moonbr_io_handle_t));
jbe@79 225 handle->fd = fd;
jbe@81 226 handle->nonblocking = -1;
jbe@81 227 handle->writeerr = 0;
jbe@81 228 handle->writeleft = 0;
jbe@83 229 handle->writeqin = 0;
jbe@83 230 handle->writeqout = 0;
jbe@81 231 handle->writeqoff = 0;
jbe@81 232 handle->writebufcnt = 0;
jbe@79 233 luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 234 lua_setmetatable(L, -2);
jbe@79 235 lua_newtable(L); // uservalue
jbe@81 236 lua_newtable(L);
jbe@81 237 lua_setfield(L, -2, "writebuf");
jbe@80 238 if (gc_idx) lua_pushvalue(L, gc_idx);
jbe@80 239 else lua_pushcfunction(L, moonbr_io_close);
jbe@80 240 lua_setfield(L, -2, "gc");
jbe@79 241 lua_newtable(L); // public
jbe@79 242 luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
jbe@79 243 lua_setmetatable(L, -2);
jbe@79 244 lua_setfield(L, -2, "public");
jbe@79 245 lua_setuservalue(L, -2);
jbe@79 246 }
jbe@79 247
jbe@79 248 static int moonbr_io_handleindex(lua_State *L) {
jbe@80 249 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 250 lua_getuservalue(L, 1);
jbe@79 251 lua_getfield(L, -1, "public");
jbe@79 252 lua_pushvalue(L, 2);
jbe@79 253 lua_gettable(L, -2);
jbe@79 254 return 1;
jbe@79 255 }
jbe@79 256
jbe@79 257 static int moonbr_io_handlenewindex(lua_State *L) {
jbe@80 258 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 259 lua_getuservalue(L, 1);
jbe@79 260 lua_getfield(L, -1, "public");
jbe@79 261 lua_pushvalue(L, 2);
jbe@79 262 lua_pushvalue(L, 3);
jbe@79 263 lua_settable(L, -3);
jbe@79 264 return 0;
jbe@79 265 }
jbe@79 266
jbe@80 267 static int moonbr_io_handlegc(lua_State *L) {
jbe@80 268 moonbr_io_handle_t *handle;
jbe@80 269 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@80 270 if (handle->fd >= 0) {
jbe@80 271 lua_getuservalue(L, 1);
jbe@80 272 lua_getfield(L, -1, "gc");
jbe@80 273 lua_pushvalue(L, 1);
jbe@80 274 lua_call(L, 1, 0);
jbe@80 275 }
jbe@80 276 return 0;
jbe@80 277 }
jbe@80 278
jbe@79 279 static int moonbr_io_getdummy(lua_State *L) {
jbe@80 280 moonbr_io_pushhandle(L, 2, 0);
jbe@79 281 return 1;
jbe@79 282 }
jbe@79 283
jbe@79 284 static const struct luaL_Reg moonbr_io_handle_methods[] = {
jbe@80 285 {"close", moonbr_io_close},
jbe@80 286 {"write", moonbr_io_write},
jbe@81 287 {"write_nb", moonbr_io_write_nb},
jbe@80 288 {"flush", moonbr_io_flush},
jbe@81 289 {"flush_nb", moonbr_io_flush_nb},
jbe@79 290 {NULL, NULL}
jbe@79 291 };
jbe@79 292
jbe@79 293 static const struct luaL_Reg moonbr_io_handle_metamethods[] = {
jbe@79 294 {"__index", moonbr_io_handleindex},
jbe@79 295 {"__newindex", moonbr_io_handlenewindex},
jbe@80 296 {"__gc", moonbr_io_handlegc},
jbe@79 297 {NULL, NULL}
jbe@79 298 };
jbe@79 299
jbe@79 300 static const struct luaL_Reg moonbr_io_module_funcs[] = {
jbe@79 301 {"getdummy", moonbr_io_getdummy},
jbe@79 302 {NULL, NULL}
jbe@79 303 };
jbe@79 304
jbe@79 305 int luaopen_moonbridge_io(lua_State *L) {
jbe@79 306
jbe@80 307 lua_newtable(L); // module
jbe@80 308
jbe@79 309 lua_newtable(L); // public metatable
jbe@79 310 lua_newtable(L); // handle methods
jbe@79 311 luaL_setfuncs(L, moonbr_io_handle_methods, 0);
jbe@80 312 lua_pushvalue(L, -1);
jbe@80 313 lua_setfield(L, -4, "handle");
jbe@79 314 lua_setfield(L, -2, "__index");
jbe@79 315 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
jbe@79 316
jbe@79 317 lua_newtable(L); // handle metatable
jbe@79 318 luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);
jbe@79 319 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 320
jbe@79 321 luaL_setfuncs(L, moonbr_io_module_funcs, 0);
jbe@79 322 return 1;
jbe@79 323
jbe@79 324 }
jbe@79 325

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