author | Kim Alvefur <zash@zash.se> |
Sat, 15 Sep 2018 01:05:59 +0200 | |
changeset 9320 | d8496858c809 |
parent 9316 | b95ef295c66d |
child 9321 | 3429006518bf |
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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/* |
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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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123 |
int fd = luaL_checkinteger(L, 2); |
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124 |
|
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#ifdef USE_EPOLL |
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126 |
|
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int wantread = lua_toboolean(L, 3); |
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int wantwrite = lua_toboolean(L, 4); |
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129 |
|
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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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133 |
|
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event.events |= EPOLLERR | EPOLLHUP | EPOLLRDHUP; |
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135 |
|
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int ret = epoll_ctl(state->epoll_fd, EPOLL_CTL_MOD, fd, &event); |
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137 |
|
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if(ret == 0) { |
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lua_pushboolean(L, 1); |
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140 |
return 1; |
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141 |
} |
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142 |
else { |
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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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147 |
return 3; |
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148 |
} |
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149 |
|
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150 |
#else |
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151 |
|
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152 |
if(!FD_ISSET(fd, &state->all)) { |
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lua_pushnil(L); |
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154 |
lua_pushstring(L, strerror(ENOENT)); |
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lua_pushinteger(L, ENOENT); |
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156 |
} |
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157 |
|
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158 |
if(!lua_isnoneornil(L, 3)) { |
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if(lua_toboolean(L, 3)) { |
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FD_SET(fd, &state->wantread); |
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161 |
} |
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162 |
else { |
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FD_CLR(fd, &state->wantread); |
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164 |
} |
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165 |
} |
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166 |
|
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167 |
if(!lua_isnoneornil(L, 4)) { |
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if(lua_toboolean(L, 4)) { |
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FD_SET(fd, &state->wantwrite); |
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} |
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171 |
else { |
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172 |
FD_CLR(fd, &state->wantwrite); |
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173 |
} |
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174 |
} |
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175 |
|
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176 |
lua_pushboolean(L, 1); |
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177 |
return 1; |
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178 |
#endif |
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179 |
} |
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180 |
|
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181 |
/* |
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182 |
* Remove FDs |
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183 |
*/ |
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184 |
int Ldel(lua_State *L) { |
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struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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186 |
int fd = luaL_checkinteger(L, 2); |
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187 |
|
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188 |
#ifdef USE_EPOLL |
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189 |
|
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190 |
struct epoll_event event; |
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191 |
event.data.fd = fd; |
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192 |
|
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int ret = epoll_ctl(state->epoll_fd, EPOLL_CTL_DEL, fd, &event); |
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194 |
|
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195 |
if(ret == 0) { |
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196 |
lua_pushboolean(L, 1); |
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197 |
return 1; |
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198 |
} |
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199 |
else { |
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200 |
ret = errno; |
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201 |
lua_pushnil(L); |
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202 |
lua_pushstring(L, strerror(ret)); |
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203 |
lua_pushinteger(L, ret); |
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204 |
return 3; |
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205 |
} |
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206 |
|
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207 |
#else |
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208 |
|
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209 |
if(!FD_ISSET(fd, &state->all)) { |
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210 |
lua_pushnil(L); |
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211 |
lua_pushstring(L, strerror(ENOENT)); |
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212 |
lua_pushinteger(L, ENOENT); |
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213 |
} |
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214 |
|
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215 |
FD_CLR(fd, &state->wantread); |
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216 |
FD_CLR(fd, &state->wantwrite); |
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217 |
FD_CLR(fd, &state->readable); |
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218 |
FD_CLR(fd, &state->writable); |
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219 |
FD_CLR(fd, &state->all); |
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220 |
FD_CLR(fd, &state->err); |
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221 |
|
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222 |
lua_pushboolean(L, 1); |
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223 |
return 1; |
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224 |
#endif |
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225 |
} |
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226 |
|
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227 |
|
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228 |
/* |
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229 |
* Check previously manipulated event state for FDs ready for reading or writing |
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230 |
*/ |
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231 |
int Lpushevent(lua_State *L, struct Lpoll_state *state) { |
9316
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232 |
#ifdef USE_EPOLL |
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233 |
|
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234 |
if(state->processed > 0) { |
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235 |
state->processed--; |
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236 |
struct epoll_event event = state->events[state->processed]; |
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237 |
lua_pushinteger(L, event.data.fd); |
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238 |
lua_pushboolean(L, event.events & (EPOLLIN | EPOLLHUP | EPOLLRDHUP | EPOLLERR)); |
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239 |
lua_pushboolean(L, event.events & EPOLLOUT); |
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240 |
return 3; |
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241 |
} |
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242 |
|
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|
243 |
#else |
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244 |
|
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for(int fd = state->processed + 1; fd < FD_SETSIZE; fd++) { |
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246 |
if(FD_ISSET(fd, &state->readable) || FD_ISSET(fd, &state->writable) || FD_ISSET(fd, &state->err)) { |
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247 |
lua_pushinteger(L, fd); |
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248 |
lua_pushboolean(L, FD_ISSET(fd, &state->readable) | FD_ISSET(fd, &state->err)); |
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249 |
lua_pushboolean(L, FD_ISSET(fd, &state->writable)); |
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250 |
FD_CLR(fd, &state->readable); |
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251 |
FD_CLR(fd, &state->writable); |
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252 |
FD_CLR(fd, &state->err); |
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253 |
state->processed = fd; |
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254 |
return 3; |
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255 |
} |
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256 |
} |
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257 |
|
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258 |
#endif |
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|
259 |
return 0; |
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260 |
} |
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261 |
|
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|
262 |
/* |
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263 |
* Wait for event |
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264 |
*/ |
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265 |
int Lwait(lua_State *L) { |
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266 |
struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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267 |
|
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268 |
int ret = Lpushevent(L, state); |
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269 |
|
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270 |
if(ret != 0) { |
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271 |
return ret; |
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272 |
} |
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273 |
|
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274 |
lua_Number timeout = luaL_checknumber(L, 2); |
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275 |
luaL_argcheck(L, timeout >= 0, 1, "positive number expected"); |
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276 |
|
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277 |
#ifdef USE_EPOLL |
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278 |
ret = epoll_wait(state->epoll_fd, state->events, MAX_EVENTS, timeout * 1000); |
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279 |
#else |
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280 |
/* |
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281 |
* select(2) mutates the fd_sets passed to it so in order to not |
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282 |
* have to recreate it manually every time a copy is made. |
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283 |
*/ |
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284 |
memcpy(&state->readable, &state->wantread, sizeof(fd_set)); |
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285 |
memcpy(&state->writable, &state->wantwrite, sizeof(fd_set)); |
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286 |
memcpy(&state->err, &state->all, sizeof(fd_set)); |
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287 |
|
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288 |
struct timeval tv; |
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289 |
tv.tv_sec = (time_t)timeout; |
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290 |
tv.tv_usec = ((suseconds_t)(timeout * 1000000)) % 1000000; |
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291 |
|
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292 |
ret = select(FD_SETSIZE, &state->readable, &state->writable, NULL, &tv); |
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293 |
#endif |
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294 |
|
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295 |
if(ret == 0) { |
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296 |
lua_pushnil(L); |
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297 |
lua_pushstring(L, "timeout"); |
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298 |
return 2; |
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299 |
} |
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300 |
else if(ret < 0) { |
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301 |
ret = errno; |
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302 |
lua_pushnil(L); |
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303 |
lua_pushstring(L, strerror(ret)); |
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304 |
lua_pushinteger(L, ret); |
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305 |
return 3; |
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306 |
} |
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307 |
|
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308 |
/* |
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309 |
* Search for the first ready FD and return it |
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310 |
*/ |
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311 |
#ifdef USE_EPOLL |
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312 |
state->processed = ret; |
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313 |
#else |
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314 |
state->processed = -1; |
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315 |
#endif |
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316 |
return Lpushevent(L, state); |
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317 |
} |
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318 |
|
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319 |
#ifdef USE_EPOLL |
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320 |
/* |
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|
321 |
* Return Epoll FD |
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322 |
*/ |
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|
323 |
int Lgetfd(lua_State *L) { |
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324 |
struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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325 |
lua_pushinteger(L, state->epoll_fd); |
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|
326 |
return 1; |
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|
327 |
} |
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|
328 |
|
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|
329 |
/* |
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|
330 |
* Close epoll FD |
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|
331 |
*/ |
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332 |
int Lgc(lua_State *L) { |
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|
333 |
struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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|
334 |
|
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|
335 |
if(close(state->epoll_fd) == 0) { |
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|
336 |
state->epoll_fd = -1; |
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337 |
} |
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338 |
else { |
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|
339 |
lua_pushstring(L, strerror(errno)); |
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|
340 |
lua_error(L); |
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341 |
} |
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|
342 |
|
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|
343 |
return 0; |
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|
344 |
} |
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|
345 |
#endif |
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|
346 |
|
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|
347 |
/* |
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|
348 |
* String representation |
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|
349 |
*/ |
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|
350 |
int Ltos(lua_State *L) { |
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|
351 |
struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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352 |
lua_pushfstring(L, "%s: %p", STATE_MT, state); |
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|
353 |
return 1; |
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|
354 |
} |
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|
355 |
|
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|
356 |
/* |
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|
357 |
* Create a new context |
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|
358 |
*/ |
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|
359 |
int Lnew(lua_State *L) { |
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|
360 |
/* Allocate state */ |
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|
361 |
Lpoll_state *state = lua_newuserdata(L, sizeof(Lpoll_state)); |
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|
362 |
luaL_setmetatable(L, STATE_MT); |
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|
363 |
|
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|
364 |
/* Initialize state */ |
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|
365 |
#ifdef USE_EPOLL |
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|
366 |
state->epoll_fd = epoll_create1(0); |
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367 |
state->processed = 0; |
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|
368 |
#else |
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|
369 |
FD_ZERO(&state->wantread); |
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|
370 |
FD_ZERO(&state->wantwrite); |
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parents:
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changeset
|
371 |
FD_ZERO(&state->readable); |
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parents:
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|
372 |
FD_ZERO(&state->writable); |
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|
373 |
state->processed = FD_SETSIZE; |
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parents:
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|
374 |
#endif |
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parents:
diff
changeset
|
375 |
|
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util.poll: Import poll library with epoll and select support
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parents:
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changeset
|
376 |
return 1; |
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util.poll: Import poll library with epoll and select support
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parents:
diff
changeset
|
377 |
} |
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Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
378 |
|
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
379 |
/* |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
380 |
* Open library |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
381 |
*/ |
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util.poll: Import poll library with epoll and select support
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parents:
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changeset
|
382 |
int luaopen_util_poll(lua_State *L) { |
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util.poll: Import poll library with epoll and select support
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parents:
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changeset
|
383 |
luaL_checkversion(L); |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
384 |
|
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util.poll: Import poll library with epoll and select support
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parents:
diff
changeset
|
385 |
luaL_newmetatable(L, STATE_MT); |
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util.poll: Import poll library with epoll and select support
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parents:
diff
changeset
|
386 |
{ |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
387 |
|
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util.poll: Import poll library with epoll and select support
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parents:
diff
changeset
|
388 |
lua_pushliteral(L, STATE_MT); |
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util.poll: Import poll library with epoll and select support
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parents:
diff
changeset
|
389 |
lua_setfield(L, -2, "__name"); |
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util.poll: Import poll library with epoll and select support
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parents:
diff
changeset
|
390 |
|
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
391 |
lua_pushcfunction(L, Ltos); |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
392 |
lua_setfield(L, -2, "__tostring"); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
393 |
|
b95ef295c66d
util.poll: Import poll library with epoll and select support
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parents:
diff
changeset
|
394 |
lua_createtable(L, 0, 2); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
395 |
{ |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
396 |
lua_pushcfunction(L, Ladd); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
397 |
lua_setfield(L, -2, "add"); |
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util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
398 |
lua_pushcfunction(L, Lset); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
399 |
lua_setfield(L, -2, "set"); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
400 |
lua_pushcfunction(L, Ldel); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
401 |
lua_setfield(L, -2, "del"); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
402 |
lua_pushcfunction(L, Lwait); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
403 |
lua_setfield(L, -2, "wait"); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
404 |
#ifdef USE_EPOLL |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
405 |
lua_pushcfunction(L, Lgetfd); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
406 |
lua_setfield(L, -2, "getfd"); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
407 |
#endif |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
408 |
} |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
409 |
lua_setfield(L, -2, "__index"); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
410 |
|
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
411 |
#ifdef USE_EPOLL |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
412 |
lua_pushcfunction(L, Lgc); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
413 |
lua_setfield(L, -2, "__gc"); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
414 |
#endif |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
415 |
} |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
416 |
|
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
417 |
lua_createtable(L, 0, 1); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
418 |
{ |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
419 |
lua_pushcfunction(L, Lnew); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
420 |
lua_setfield(L, -2, "new"); |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
421 |
} |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
422 |
return 1; |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
423 |
} |
b95ef295c66d
util.poll: Import poll library with epoll and select support
Kim Alvefur <zash@zash.se>
parents:
diff
changeset
|
424 |