author | Kim Alvefur <zash@zash.se> |
Fri, 21 Sep 2018 21:19:44 +0200 | |
changeset 9339 | 9e8d7d461c7d |
parent 9321 | 3429006518bf |
child 9440 | b202aa1e2d7b |
permissions | -rw-r--r-- |
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/* |
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* Lua polling library |
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* Copyright (C) 2017-2018 Kim Alvefur |
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* |
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* This project is MIT licensed. Please see the |
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* COPYING file in the source package for more information. |
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* |
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*/ |
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#include <unistd.h> |
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#include <string.h> |
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#include <errno.h> |
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#ifdef __linux__ |
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#define USE_EPOLL |
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#endif |
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#ifdef USE_EPOLL |
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#include <sys/epoll.h> |
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#ifndef MAX_EVENTS |
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#define MAX_EVENTS 10 |
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#endif |
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#else |
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#include <sys/select.h> |
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#endif |
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#include <lualib.h> |
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#include <lauxlib.h> |
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#ifdef USE_EPOLL |
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#define STATE_MT "util.poll.epoll" |
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#else |
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#define STATE_MT "util.poll.select" |
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#endif |
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#if (LUA_VERSION_NUM == 501) |
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#define luaL_setmetatable(L, tname) luaL_getmetatable(L, tname); lua_setmetatable(L, -2) |
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#endif |
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/* |
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* Structure to keep state for each type of API |
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*/ |
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typedef struct Lpoll_state { |
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int processed; |
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#ifdef USE_EPOLL |
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int epoll_fd; |
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struct epoll_event events[MAX_EVENTS]; |
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#else |
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fd_set wantread; |
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fd_set wantwrite; |
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fd_set readable; |
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fd_set writable; |
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fd_set all; |
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fd_set err; |
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#endif |
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} Lpoll_state; |
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/* |
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* Add an FD to be watched |
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*/ |
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int Ladd(lua_State *L) { |
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struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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int fd = luaL_checkinteger(L, 2); |
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int wantread = lua_toboolean(L, 3); |
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int wantwrite = lua_toboolean(L, 4); |
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#ifdef USE_EPOLL |
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struct epoll_event event; |
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event.data.fd = fd; |
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event.events = (wantread ? EPOLLIN : 0) | (wantwrite ? EPOLLOUT : 0); |
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event.events |= EPOLLERR | EPOLLHUP | EPOLLRDHUP; |
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int ret = epoll_ctl(state->epoll_fd, EPOLL_CTL_ADD, fd, &event); |
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if(ret < 0) { |
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ret = errno; |
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lua_pushnil(L); |
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lua_pushstring(L, strerror(ret)); |
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lua_pushinteger(L, ret); |
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return 3; |
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} |
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lua_pushboolean(L, 1); |
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return 1; |
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#else |
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if(FD_ISSET(fd, &state->all)) { |
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lua_pushnil(L); |
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lua_pushstring(L, strerror(EEXIST)); |
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lua_pushinteger(L, EEXIST); |
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} |
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FD_CLR(fd, &state->readable); |
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FD_CLR(fd, &state->writable); |
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FD_CLR(fd, &state->err); |
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FD_SET(fd, &state->all); |
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if(wantread) { |
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FD_SET(fd, &state->wantread); |
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} |
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else { |
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FD_CLR(fd, &state->wantread); |
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} |
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if(wantwrite) { |
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FD_SET(fd, &state->wantwrite); |
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} |
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else { |
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FD_CLR(fd, &state->wantwrite); |
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} |
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lua_pushboolean(L, 1); |
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return 1; |
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#endif |
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} |
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/* |
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* Set events to watch for, readable and/or writable |
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*/ |
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int Lset(lua_State *L) { |
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struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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int fd = luaL_checkinteger(L, 2); |
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128 |
|
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129 |
#ifdef USE_EPOLL |
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130 |
|
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131 |
int wantread = lua_toboolean(L, 3); |
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int wantwrite = lua_toboolean(L, 4); |
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133 |
|
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struct epoll_event event; |
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event.data.fd = fd; |
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event.events = (wantread ? EPOLLIN : 0) | (wantwrite ? EPOLLOUT : 0); |
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137 |
|
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event.events |= EPOLLERR | EPOLLHUP | EPOLLRDHUP; |
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139 |
|
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int ret = epoll_ctl(state->epoll_fd, EPOLL_CTL_MOD, fd, &event); |
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141 |
|
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142 |
if(ret == 0) { |
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143 |
lua_pushboolean(L, 1); |
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144 |
return 1; |
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145 |
} |
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146 |
else { |
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147 |
ret = errno; |
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148 |
lua_pushnil(L); |
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149 |
lua_pushstring(L, strerror(ret)); |
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150 |
lua_pushinteger(L, ret); |
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151 |
return 3; |
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152 |
} |
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153 |
|
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154 |
#else |
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155 |
|
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156 |
if(!FD_ISSET(fd, &state->all)) { |
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157 |
lua_pushnil(L); |
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158 |
lua_pushstring(L, strerror(ENOENT)); |
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159 |
lua_pushinteger(L, ENOENT); |
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160 |
} |
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161 |
|
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162 |
if(!lua_isnoneornil(L, 3)) { |
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163 |
if(lua_toboolean(L, 3)) { |
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164 |
FD_SET(fd, &state->wantread); |
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165 |
} |
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166 |
else { |
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167 |
FD_CLR(fd, &state->wantread); |
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168 |
} |
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169 |
} |
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170 |
|
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171 |
if(!lua_isnoneornil(L, 4)) { |
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172 |
if(lua_toboolean(L, 4)) { |
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173 |
FD_SET(fd, &state->wantwrite); |
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174 |
} |
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175 |
else { |
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176 |
FD_CLR(fd, &state->wantwrite); |
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177 |
} |
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178 |
} |
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179 |
|
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180 |
lua_pushboolean(L, 1); |
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181 |
return 1; |
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182 |
#endif |
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183 |
} |
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184 |
|
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185 |
/* |
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186 |
* Remove FDs |
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187 |
*/ |
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188 |
int Ldel(lua_State *L) { |
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189 |
struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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190 |
int fd = luaL_checkinteger(L, 2); |
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191 |
|
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192 |
#ifdef USE_EPOLL |
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193 |
|
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194 |
struct epoll_event event; |
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195 |
event.data.fd = fd; |
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196 |
|
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int ret = epoll_ctl(state->epoll_fd, EPOLL_CTL_DEL, fd, &event); |
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198 |
|
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199 |
if(ret == 0) { |
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200 |
lua_pushboolean(L, 1); |
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201 |
return 1; |
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202 |
} |
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203 |
else { |
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204 |
ret = errno; |
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205 |
lua_pushnil(L); |
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206 |
lua_pushstring(L, strerror(ret)); |
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207 |
lua_pushinteger(L, ret); |
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208 |
return 3; |
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209 |
} |
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210 |
|
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211 |
#else |
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212 |
|
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213 |
if(!FD_ISSET(fd, &state->all)) { |
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214 |
lua_pushnil(L); |
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215 |
lua_pushstring(L, strerror(ENOENT)); |
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216 |
lua_pushinteger(L, ENOENT); |
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217 |
} |
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218 |
|
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219 |
FD_CLR(fd, &state->wantread); |
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220 |
FD_CLR(fd, &state->wantwrite); |
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221 |
FD_CLR(fd, &state->readable); |
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222 |
FD_CLR(fd, &state->writable); |
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223 |
FD_CLR(fd, &state->all); |
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224 |
FD_CLR(fd, &state->err); |
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225 |
|
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226 |
lua_pushboolean(L, 1); |
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227 |
return 1; |
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228 |
#endif |
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229 |
} |
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230 |
|
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231 |
|
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232 |
/* |
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233 |
* Check previously manipulated event state for FDs ready for reading or writing |
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234 |
*/ |
9320
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235 |
int Lpushevent(lua_State *L, struct Lpoll_state *state) { |
9316
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236 |
#ifdef USE_EPOLL |
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237 |
|
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238 |
if(state->processed > 0) { |
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239 |
state->processed--; |
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240 |
struct epoll_event event = state->events[state->processed]; |
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241 |
lua_pushinteger(L, event.data.fd); |
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242 |
lua_pushboolean(L, event.events & (EPOLLIN | EPOLLHUP | EPOLLRDHUP | EPOLLERR)); |
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243 |
lua_pushboolean(L, event.events & EPOLLOUT); |
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244 |
return 3; |
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245 |
} |
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246 |
|
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247 |
#else |
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248 |
|
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249 |
for(int fd = state->processed + 1; fd < FD_SETSIZE; fd++) { |
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250 |
if(FD_ISSET(fd, &state->readable) || FD_ISSET(fd, &state->writable) || FD_ISSET(fd, &state->err)) { |
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251 |
lua_pushinteger(L, fd); |
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252 |
lua_pushboolean(L, FD_ISSET(fd, &state->readable) | FD_ISSET(fd, &state->err)); |
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253 |
lua_pushboolean(L, FD_ISSET(fd, &state->writable)); |
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254 |
FD_CLR(fd, &state->readable); |
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255 |
FD_CLR(fd, &state->writable); |
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256 |
FD_CLR(fd, &state->err); |
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257 |
state->processed = fd; |
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258 |
return 3; |
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259 |
} |
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260 |
} |
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261 |
|
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262 |
#endif |
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263 |
return 0; |
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264 |
} |
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265 |
|
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266 |
/* |
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267 |
* Wait for event |
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268 |
*/ |
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269 |
int Lwait(lua_State *L) { |
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struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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271 |
|
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int ret = Lpushevent(L, state); |
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273 |
|
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274 |
if(ret != 0) { |
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275 |
return ret; |
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276 |
} |
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277 |
|
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278 |
lua_Number timeout = luaL_checknumber(L, 2); |
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279 |
luaL_argcheck(L, timeout >= 0, 1, "positive number expected"); |
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280 |
|
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281 |
#ifdef USE_EPOLL |
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282 |
ret = epoll_wait(state->epoll_fd, state->events, MAX_EVENTS, timeout * 1000); |
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283 |
#else |
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284 |
/* |
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285 |
* select(2) mutates the fd_sets passed to it so in order to not |
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286 |
* have to recreate it manually every time a copy is made. |
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287 |
*/ |
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288 |
memcpy(&state->readable, &state->wantread, sizeof(fd_set)); |
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289 |
memcpy(&state->writable, &state->wantwrite, sizeof(fd_set)); |
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290 |
memcpy(&state->err, &state->all, sizeof(fd_set)); |
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291 |
|
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292 |
struct timeval tv; |
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293 |
tv.tv_sec = (time_t)timeout; |
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294 |
tv.tv_usec = ((suseconds_t)(timeout * 1000000)) % 1000000; |
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295 |
|
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ret = select(FD_SETSIZE, &state->readable, &state->writable, NULL, &tv); |
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297 |
#endif |
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298 |
|
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299 |
if(ret == 0) { |
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300 |
lua_pushnil(L); |
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301 |
lua_pushstring(L, "timeout"); |
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302 |
return 2; |
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303 |
} |
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304 |
else if(ret < 0) { |
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305 |
ret = errno; |
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306 |
lua_pushnil(L); |
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307 |
lua_pushstring(L, strerror(ret)); |
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308 |
lua_pushinteger(L, ret); |
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309 |
return 3; |
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310 |
} |
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311 |
|
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312 |
/* |
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313 |
* Search for the first ready FD and return it |
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314 |
*/ |
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|
315 |
#ifdef USE_EPOLL |
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316 |
state->processed = ret; |
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317 |
#else |
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318 |
state->processed = -1; |
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319 |
#endif |
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320 |
return Lpushevent(L, state); |
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321 |
} |
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322 |
|
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323 |
#ifdef USE_EPOLL |
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324 |
/* |
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325 |
* Return Epoll FD |
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326 |
*/ |
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327 |
int Lgetfd(lua_State *L) { |
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328 |
struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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329 |
lua_pushinteger(L, state->epoll_fd); |
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330 |
return 1; |
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331 |
} |
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332 |
|
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333 |
/* |
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334 |
* Close epoll FD |
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335 |
*/ |
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336 |
int Lgc(lua_State *L) { |
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337 |
struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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338 |
|
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339 |
if(close(state->epoll_fd) == 0) { |
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340 |
state->epoll_fd = -1; |
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341 |
} |
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342 |
else { |
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343 |
lua_pushstring(L, strerror(errno)); |
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344 |
lua_error(L); |
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345 |
} |
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346 |
|
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|
347 |
return 0; |
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|
348 |
} |
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|
349 |
#endif |
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|
350 |
|
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|
351 |
/* |
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|
352 |
* String representation |
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|
353 |
*/ |
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|
354 |
int Ltos(lua_State *L) { |
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355 |
struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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356 |
lua_pushfstring(L, "%s: %p", STATE_MT, state); |
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357 |
return 1; |
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|
358 |
} |
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|
359 |
|
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|
360 |
/* |
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|
361 |
* Create a new context |
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362 |
*/ |
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|
363 |
int Lnew(lua_State *L) { |
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|
364 |
/* Allocate state */ |
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|
365 |
Lpoll_state *state = lua_newuserdata(L, sizeof(Lpoll_state)); |
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366 |
luaL_setmetatable(L, STATE_MT); |
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|
367 |
|
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|
368 |
/* Initialize state */ |
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369 |
#ifdef USE_EPOLL |
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370 |
state->epoll_fd = epoll_create1(0); |
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371 |
state->processed = 0; |
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372 |
#else |
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373 |
FD_ZERO(&state->wantread); |
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374 |
FD_ZERO(&state->wantwrite); |
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375 |
FD_ZERO(&state->readable); |
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376 |
FD_ZERO(&state->writable); |
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377 |
state->processed = FD_SETSIZE; |
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|
378 |
#endif |
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|
379 |
|
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|
380 |
return 1; |
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parents:
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|
381 |
} |
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|
382 |
|
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util.poll: Import poll library with epoll and select support
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|
383 |
/* |
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util.poll: Import poll library with epoll and select support
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|
384 |
* Open library |
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util.poll: Import poll library with epoll and select support
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|
385 |
*/ |
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|
386 |
int luaopen_util_poll(lua_State *L) { |
9321 | 387 |
#if (LUA_VERSION_NUM > 501) |
9316
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|
388 |
luaL_checkversion(L); |
9321 | 389 |
#endif |
9316
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|
390 |
|
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changeset
|
391 |
luaL_newmetatable(L, STATE_MT); |
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|
392 |
{ |
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parents:
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|
393 |
|
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|
394 |
lua_pushliteral(L, STATE_MT); |
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|
395 |
lua_setfield(L, -2, "__name"); |
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|
396 |
|
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|
397 |
lua_pushcfunction(L, Ltos); |
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|
398 |
lua_setfield(L, -2, "__tostring"); |
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|
399 |
|
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|
400 |
lua_createtable(L, 0, 2); |
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util.poll: Import poll library with epoll and select support
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parents:
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|
401 |
{ |
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changeset
|
402 |
lua_pushcfunction(L, Ladd); |
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changeset
|
403 |
lua_setfield(L, -2, "add"); |
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changeset
|
404 |
lua_pushcfunction(L, Lset); |
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parents:
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changeset
|
405 |
lua_setfield(L, -2, "set"); |
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parents:
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|
406 |
lua_pushcfunction(L, Ldel); |
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util.poll: Import poll library with epoll and select support
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parents:
diff
changeset
|
407 |
lua_setfield(L, -2, "del"); |
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util.poll: Import poll library with epoll and select support
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parents:
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|
408 |
lua_pushcfunction(L, Lwait); |
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util.poll: Import poll library with epoll and select support
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parents:
diff
changeset
|
409 |
lua_setfield(L, -2, "wait"); |
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util.poll: Import poll library with epoll and select support
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parents:
diff
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|
410 |
#ifdef USE_EPOLL |
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|
411 |
lua_pushcfunction(L, Lgetfd); |
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util.poll: Import poll library with epoll and select support
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parents:
diff
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|
412 |
lua_setfield(L, -2, "getfd"); |
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parents:
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|
413 |
#endif |
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parents:
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|
414 |
} |
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parents:
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changeset
|
415 |
lua_setfield(L, -2, "__index"); |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
416 |
|
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
417 |
#ifdef USE_EPOLL |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
418 |
lua_pushcfunction(L, Lgc); |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
419 |
lua_setfield(L, -2, "__gc"); |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
420 |
#endif |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
421 |
} |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
422 |
|
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
423 |
lua_createtable(L, 0, 1); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
424 |
{ |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
425 |
lua_pushcfunction(L, Lnew); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
426 |
lua_setfield(L, -2, "new"); |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
427 |
} |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
428 |
return 1; |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
429 |
} |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
430 |