moonbridge

annotate moonbridge_io.c @ 82:069ee3f5ab17

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Non-blocking write methods shall return io handle
author jbe
date Mon Apr 06 03:41:30 2015 +0200 (2015-04-06)
parents e1aec772a6ab
children 697cdf8e2000
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@81 33 int writeleft;
jbe@81 34 int writeqoff;
jbe@81 35 int writebufcnt;
jbe@80 36 char writebuf[MOONBR_IO_WRITEBUFLEN];
jbe@79 37 } moonbr_io_handle_t;
jbe@79 38
jbe@81 39 static void moonbr_io_handle_set_nonblocking(lua_State *L, moonbr_io_handle_t *handle, int nonblocking) {
jbe@81 40 if (handle->nonblocking != nonblocking) {
jbe@81 41 int flags;
jbe@81 42 flags = fcntl(handle->fd, F_GETFL, 0);
jbe@81 43 if (flags == -1) {
jbe@81 44 moonbr_io_errmsg();
jbe@81 45 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
jbe@81 46 }
jbe@81 47 if (nonblocking) flags |= O_NONBLOCK;
jbe@81 48 else flags &= ~O_NONBLOCK;
jbe@81 49 if (fcntl(handle->fd, F_SETFL, flags) == -1) {
jbe@81 50 moonbr_io_errmsg();
jbe@81 51 luaL_error(L, "Unexpected error in fcntl call: %s", errmsg);
jbe@81 52 }
jbe@81 53 }
jbe@81 54 }
jbe@81 55
jbe@80 56 static int moonbr_io_close(lua_State *L) {
jbe@80 57 moonbr_io_handle_t *handle;
jbe@80 58 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@80 59 if (handle->fd < 0) luaL_error(L, "Attempt to close a closed I/O handle");
jbe@80 60 if (close(handle->fd)) {
jbe@80 61 handle->fd = -1;
jbe@80 62 moonbr_io_errmsg();
jbe@80 63 lua_pushnil(L);
jbe@80 64 lua_pushstring(L, errmsg);
jbe@80 65 return 2;
jbe@80 66 }
jbe@80 67 handle->fd = -1;
jbe@80 68 lua_pushboolean(L, 1);
jbe@80 69 return 1;
jbe@80 70 }
jbe@80 71
jbe@81 72 static int moonbr_io_write_impl(lua_State *L, int nonblocking, int flush) {
jbe@80 73 moonbr_io_handle_t *handle;
jbe@80 74 int i, top;
jbe@81 75 lua_Integer qlen, qpos, qpos2;
jbe@80 76 const char *str;
jbe@81 77 size_t strlen, strpos;
jbe@80 78 size_t written;
jbe@80 79 ssize_t result;
jbe@80 80 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@81 81 if (handle->writeerr) {
jbe@80 82 lua_pushnil(L);
jbe@80 83 lua_pushliteral(L, "Previous write error");
jbe@80 84 return 2;
jbe@80 85 }
jbe@81 86 moonbr_io_handle_set_nonblocking(L, handle, nonblocking);
jbe@81 87 if (!flush) top = lua_gettop(L);
jbe@81 88 lua_getuservalue(L, 1);
jbe@81 89 lua_getfield(L, -1, "writebuf");
jbe@81 90 qlen = lua_rawlen(L, -1);
jbe@81 91 if (!flush) {
jbe@81 92 for (i=2; i<=top; i++) {
jbe@81 93 luaL_checklstring(L, i, &strlen);
jbe@81 94 lua_pushvalue(L, i);
jbe@81 95 lua_rawseti(L, -2, ++qlen);
jbe@81 96 handle->writeleft += strlen;
jbe@81 97 }
jbe@81 98 }
jbe@81 99 for (qpos=1; qpos<=qlen; qpos++) {
jbe@81 100 lua_rawgeti(L, -1, qpos);
jbe@81 101 str = lua_tolstring(L, -1, &strlen);
jbe@81 102 strpos = handle->writeqoff;
jbe@81 103 while (strpos < strlen) {
jbe@81 104 if (strlen - strpos < MOONBR_IO_WRITEBUFLEN - handle->writebufcnt) {
jbe@81 105 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, strlen - strpos);
jbe@81 106 handle->writebufcnt += strlen - strpos;
jbe@80 107 break;
jbe@80 108 } else {
jbe@80 109 written = 0;
jbe@81 110 memcpy(handle->writebuf + handle->writebufcnt, str + strpos, MOONBR_IO_WRITEBUFLEN - handle->writebufcnt);
jbe@81 111 strpos += MOONBR_IO_WRITEBUFLEN - handle->writebufcnt;
jbe@80 112 while (written < MOONBR_IO_WRITEBUFLEN) {
jbe@80 113 result = write(handle->fd, handle->writebuf + written, MOONBR_IO_WRITEBUFLEN - written);
jbe@80 114 if (result < 0) {
jbe@81 115 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
jbe@81 116 if (written) {
jbe@81 117 handle->writebufcnt -= written;
jbe@81 118 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
jbe@81 119 }
jbe@81 120 if (i > 1) {
jbe@81 121 for (qpos2=1; qpos2<=qlen; qpos2++) {
jbe@81 122 if (qpos2+qpos-1 <= qlen) lua_rawgeti(L, -1, qpos2+qpos-1);
jbe@81 123 else lua_pushnil(L);
jbe@81 124 lua_rawseti(L, -2, qpos2);
jbe@81 125 }
jbe@81 126 }
jbe@81 127 handle->writeqoff = strpos;
jbe@81 128 goto moonbr_io_write_impl_block;
jbe@81 129 } else if (errno != EINTR) {
jbe@80 130 moonbr_io_errmsg();
jbe@81 131 handle->writeerr = 1;
jbe@80 132 lua_pushnil(L);
jbe@80 133 lua_pushstring(L, errmsg);
jbe@80 134 return 2;
jbe@80 135 }
jbe@80 136 } else {
jbe@80 137 written += result;
jbe@81 138 handle->writeleft -= result;
jbe@80 139 }
jbe@80 140 }
jbe@81 141 handle->writebufcnt = 0;
jbe@80 142 }
jbe@80 143 }
jbe@81 144 handle->writeqoff = 0;
jbe@81 145 lua_pop(L, 1);
jbe@81 146 lua_pushnil(L);
jbe@81 147 lua_rawseti(L, -2, qpos);
jbe@80 148 }
jbe@81 149 if (flush) {
jbe@81 150 written = 0;
jbe@81 151 while (written < handle->writebufcnt) {
jbe@81 152 result = write(handle->fd, handle->writebuf + written, handle->writebufcnt - written);
jbe@81 153 if (result < 0) {
jbe@81 154 if (nonblocking && (errno == EAGAIN || errno == EWOULDBLOCK)) {
jbe@81 155 if (written) {
jbe@81 156 handle->writebufcnt -= written;
jbe@81 157 memmove(handle->writebuf, handle->writebuf + written, handle->writebufcnt);
jbe@81 158 }
jbe@81 159 goto moonbr_io_write_impl_block;
jbe@81 160 } else if (errno != EINTR) {
jbe@81 161 moonbr_io_errmsg();
jbe@81 162 handle->writeerr = -1;
jbe@81 163 lua_pushnil(L);
jbe@81 164 lua_pushstring(L, errmsg);
jbe@81 165 return 2;
jbe@81 166 }
jbe@81 167 } else {
jbe@81 168 written += result;
jbe@81 169 handle->writeleft -= result;
jbe@81 170 }
jbe@81 171 }
jbe@81 172 handle->writebufcnt = 0;
jbe@82 173 if (nonblocking) lua_pushinteger(L, 0);
jbe@81 174 } else {
jbe@82 175 if (nonblocking) lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
jbe@81 176 }
jbe@82 177 if (!nonblocking) lua_pushvalue(L, 1);
jbe@80 178 return 1;
jbe@81 179 moonbr_io_write_impl_block:
jbe@81 180 if (flush) lua_pushinteger(L, handle->writeleft);
jbe@81 181 else lua_pushinteger(L, handle->writeleft - handle->writebufcnt);
jbe@81 182 return 1;
jbe@81 183 }
jbe@81 184
jbe@81 185 static int moonbr_io_write(lua_State *L) {
jbe@81 186 return moonbr_io_write_impl(L, 0, 0);
jbe@81 187 }
jbe@81 188
jbe@81 189 static int moonbr_io_write_nb(lua_State *L) {
jbe@81 190 return moonbr_io_write_impl(L, 1, 0);
jbe@80 191 }
jbe@80 192
jbe@80 193 static int moonbr_io_flush(lua_State *L) {
jbe@81 194 return moonbr_io_write_impl(L, 0, 1);
jbe@81 195 }
jbe@81 196
jbe@81 197 static int moonbr_io_flush_nb(lua_State *L) {
jbe@81 198 return moonbr_io_write_impl(L, 1, 1);
jbe@80 199 }
jbe@80 200
jbe@80 201 void moonbr_io_pushhandle(lua_State *L, int fd, int gc_idx) {
jbe@79 202 moonbr_io_handle_t *handle;
jbe@79 203 handle = lua_newuserdata(L, sizeof(moonbr_io_handle_t));
jbe@79 204 handle->fd = fd;
jbe@81 205 handle->nonblocking = -1;
jbe@81 206 handle->writeerr = 0;
jbe@81 207 handle->writeleft = 0;
jbe@81 208 handle->writeqoff = 0;
jbe@81 209 handle->writebufcnt = 0;
jbe@79 210 luaL_getmetatable(L, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 211 lua_setmetatable(L, -2);
jbe@79 212 lua_newtable(L); // uservalue
jbe@81 213 lua_newtable(L);
jbe@81 214 lua_setfield(L, -2, "writebuf");
jbe@80 215 if (gc_idx) lua_pushvalue(L, gc_idx);
jbe@80 216 else lua_pushcfunction(L, moonbr_io_close);
jbe@80 217 lua_setfield(L, -2, "gc");
jbe@79 218 lua_newtable(L); // public
jbe@79 219 luaL_getmetatable(L, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
jbe@79 220 lua_setmetatable(L, -2);
jbe@79 221 lua_setfield(L, -2, "public");
jbe@79 222 lua_setuservalue(L, -2);
jbe@79 223 }
jbe@79 224
jbe@79 225 static int moonbr_io_handleindex(lua_State *L) {
jbe@80 226 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 227 lua_getuservalue(L, 1);
jbe@79 228 lua_getfield(L, -1, "public");
jbe@79 229 lua_pushvalue(L, 2);
jbe@79 230 lua_gettable(L, -2);
jbe@79 231 return 1;
jbe@79 232 }
jbe@79 233
jbe@79 234 static int moonbr_io_handlenewindex(lua_State *L) {
jbe@80 235 luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 236 lua_getuservalue(L, 1);
jbe@79 237 lua_getfield(L, -1, "public");
jbe@79 238 lua_pushvalue(L, 2);
jbe@79 239 lua_pushvalue(L, 3);
jbe@79 240 lua_settable(L, -3);
jbe@79 241 return 0;
jbe@79 242 }
jbe@79 243
jbe@80 244 static int moonbr_io_handlegc(lua_State *L) {
jbe@80 245 moonbr_io_handle_t *handle;
jbe@80 246 handle = luaL_checkudata(L, 1, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@80 247 if (handle->fd >= 0) {
jbe@80 248 lua_getuservalue(L, 1);
jbe@80 249 lua_getfield(L, -1, "gc");
jbe@80 250 lua_pushvalue(L, 1);
jbe@80 251 lua_call(L, 1, 0);
jbe@80 252 }
jbe@80 253 return 0;
jbe@80 254 }
jbe@80 255
jbe@79 256 static int moonbr_io_getdummy(lua_State *L) {
jbe@80 257 moonbr_io_pushhandle(L, 2, 0);
jbe@79 258 return 1;
jbe@79 259 }
jbe@79 260
jbe@79 261 static const struct luaL_Reg moonbr_io_handle_methods[] = {
jbe@80 262 {"close", moonbr_io_close},
jbe@80 263 {"write", moonbr_io_write},
jbe@81 264 {"write_nb", moonbr_io_write_nb},
jbe@80 265 {"flush", moonbr_io_flush},
jbe@81 266 {"flush_nb", moonbr_io_flush_nb},
jbe@79 267 {NULL, NULL}
jbe@79 268 };
jbe@79 269
jbe@79 270 static const struct luaL_Reg moonbr_io_handle_metamethods[] = {
jbe@79 271 {"__index", moonbr_io_handleindex},
jbe@79 272 {"__newindex", moonbr_io_handlenewindex},
jbe@80 273 {"__gc", moonbr_io_handlegc},
jbe@79 274 {NULL, NULL}
jbe@79 275 };
jbe@79 276
jbe@79 277 static const struct luaL_Reg moonbr_io_module_funcs[] = {
jbe@79 278 {"getdummy", moonbr_io_getdummy},
jbe@79 279 {NULL, NULL}
jbe@79 280 };
jbe@79 281
jbe@79 282 int luaopen_moonbridge_io(lua_State *L) {
jbe@79 283
jbe@80 284 lua_newtable(L); // module
jbe@80 285
jbe@79 286 lua_newtable(L); // public metatable
jbe@79 287 lua_newtable(L); // handle methods
jbe@79 288 luaL_setfuncs(L, moonbr_io_handle_methods, 0);
jbe@80 289 lua_pushvalue(L, -1);
jbe@80 290 lua_setfield(L, -4, "handle");
jbe@79 291 lua_setfield(L, -2, "__index");
jbe@79 292 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_PUBLIC_MT_REGKEY);
jbe@79 293
jbe@79 294 lua_newtable(L); // handle metatable
jbe@79 295 luaL_setfuncs(L, moonbr_io_handle_metamethods, 0);
jbe@79 296 lua_setfield(L, LUA_REGISTRYINDEX, MOONBR_IO_HANDLE_MT_REGKEY);
jbe@79 297
jbe@79 298 luaL_setfuncs(L, moonbr_io_module_funcs, 0);
jbe@79 299 return 1;
jbe@79 300
jbe@79 301 }
jbe@79 302

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