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util-src/poll.c @ 9456:d54a0e129af8
util.promise: ES6-like API for promises
author | Matthew Wild <mwild1@gmail.com> |
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date | Wed, 10 Oct 2018 17:45:19 +0100 |
parent | 9450:b890ceb1c24f |
child | 9475:9b26a50cdfe3 |
rev | line source |
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1 |
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2 /* |
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3 * Lua polling library |
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4 * Copyright (C) 2017-2018 Kim Alvefur |
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5 * |
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6 * This project is MIT licensed. Please see the |
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7 * COPYING file in the source package for more information. |
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8 * |
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9 */ |
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10 |
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11 #include <unistd.h> |
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12 #include <string.h> |
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13 #include <errno.h> |
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14 |
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15 #ifdef __linux__ |
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16 #define USE_EPOLL |
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17 #endif |
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18 |
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19 #ifdef USE_EPOLL |
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20 #include <sys/epoll.h> |
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21 #ifndef MAX_EVENTS |
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22 #define MAX_EVENTS 64 |
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23 #endif |
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24 #else |
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25 #include <sys/select.h> |
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26 #endif |
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27 |
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28 #include <lualib.h> |
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29 #include <lauxlib.h> |
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30 |
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31 #ifdef USE_EPOLL |
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32 #define STATE_MT "util.poll<epoll>" |
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33 #else |
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34 #define STATE_MT "util.poll<select>" |
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35 #endif |
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36 |
9318 | 37 #if (LUA_VERSION_NUM == 501) |
38 #define luaL_setmetatable(L, tname) luaL_getmetatable(L, tname); lua_setmetatable(L, -2) | |
39 #endif | |
40 | |
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41 /* |
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42 * Structure to keep state for each type of API |
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43 */ |
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44 typedef struct Lpoll_state { |
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45 int processed; |
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46 #ifdef USE_EPOLL |
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47 int epoll_fd; |
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48 struct epoll_event events[MAX_EVENTS]; |
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49 #else |
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50 fd_set wantread; |
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51 fd_set wantwrite; |
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52 fd_set readable; |
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53 fd_set writable; |
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54 fd_set all; |
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55 fd_set err; |
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56 #endif |
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57 } Lpoll_state; |
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58 |
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59 /* |
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60 * Add an FD to be watched |
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61 */ |
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62 int Ladd(lua_State *L) { |
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63 struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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64 int fd = luaL_checkinteger(L, 2); |
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65 |
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66 int wantread = lua_toboolean(L, 3); |
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67 int wantwrite = lua_toboolean(L, 4); |
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68 |
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69 if(fd < 0) { |
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70 lua_pushnil(L); |
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71 lua_pushstring(L, strerror(EBADF)); |
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72 lua_pushinteger(L, EBADF); |
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73 return 3; |
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74 } |
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75 |
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76 #ifdef USE_EPOLL |
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77 struct epoll_event event; |
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78 event.data.fd = fd; |
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79 event.events = (wantread ? EPOLLIN : 0) | (wantwrite ? EPOLLOUT : 0); |
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80 |
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81 event.events |= EPOLLERR | EPOLLHUP | EPOLLRDHUP; |
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82 |
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83 int ret = epoll_ctl(state->epoll_fd, EPOLL_CTL_ADD, fd, &event); |
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84 |
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85 if(ret < 0) { |
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86 ret = errno; |
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87 lua_pushnil(L); |
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88 lua_pushstring(L, strerror(ret)); |
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89 lua_pushinteger(L, ret); |
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90 return 3; |
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91 } |
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92 |
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93 lua_pushboolean(L, 1); |
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94 return 1; |
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95 |
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96 #else |
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97 |
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98 if(fd > FD_SETSIZE) { |
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99 lua_pushnil(L); |
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100 lua_pushstring(L, strerror(EBADF)); |
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101 lua_pushinteger(L, EBADF); |
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102 return 3; |
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103 } |
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104 |
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105 if(FD_ISSET(fd, &state->all)) { |
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106 lua_pushnil(L); |
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107 lua_pushstring(L, strerror(EEXIST)); |
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108 lua_pushinteger(L, EEXIST); |
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109 return 3; |
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110 } |
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111 |
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112 FD_CLR(fd, &state->readable); |
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113 FD_CLR(fd, &state->writable); |
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114 FD_CLR(fd, &state->err); |
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115 |
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116 FD_SET(fd, &state->all); |
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117 |
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118 if(wantread) { |
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119 FD_SET(fd, &state->wantread); |
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120 } |
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121 else { |
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122 FD_CLR(fd, &state->wantread); |
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123 } |
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124 |
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125 if(wantwrite) { |
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126 FD_SET(fd, &state->wantwrite); |
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127 } |
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128 else { |
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129 FD_CLR(fd, &state->wantwrite); |
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130 } |
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131 |
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132 lua_pushboolean(L, 1); |
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133 return 1; |
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134 #endif |
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135 } |
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136 |
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137 /* |
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138 * Set events to watch for, readable and/or writable |
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139 */ |
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140 int Lset(lua_State *L) { |
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141 struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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142 int fd = luaL_checkinteger(L, 2); |
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143 |
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144 #ifdef USE_EPOLL |
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145 |
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146 int wantread = lua_toboolean(L, 3); |
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147 int wantwrite = lua_toboolean(L, 4); |
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148 |
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149 struct epoll_event event; |
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150 event.data.fd = fd; |
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151 event.events = (wantread ? EPOLLIN : 0) | (wantwrite ? EPOLLOUT : 0); |
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152 |
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153 event.events |= EPOLLERR | EPOLLHUP | EPOLLRDHUP; |
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154 |
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155 int ret = epoll_ctl(state->epoll_fd, EPOLL_CTL_MOD, fd, &event); |
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156 |
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157 if(ret == 0) { |
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158 lua_pushboolean(L, 1); |
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159 return 1; |
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160 } |
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161 else { |
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162 ret = errno; |
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163 lua_pushnil(L); |
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164 lua_pushstring(L, strerror(ret)); |
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165 lua_pushinteger(L, ret); |
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166 return 3; |
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167 } |
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168 |
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169 #else |
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170 |
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171 if(!FD_ISSET(fd, &state->all)) { |
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172 lua_pushnil(L); |
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173 lua_pushstring(L, strerror(ENOENT)); |
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174 lua_pushinteger(L, ENOENT); |
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175 } |
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176 |
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177 if(!lua_isnoneornil(L, 3)) { |
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178 if(lua_toboolean(L, 3)) { |
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179 FD_SET(fd, &state->wantread); |
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180 } |
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181 else { |
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182 FD_CLR(fd, &state->wantread); |
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183 } |
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184 } |
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185 |
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186 if(!lua_isnoneornil(L, 4)) { |
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187 if(lua_toboolean(L, 4)) { |
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188 FD_SET(fd, &state->wantwrite); |
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189 } |
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190 else { |
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191 FD_CLR(fd, &state->wantwrite); |
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192 } |
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193 } |
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194 |
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195 lua_pushboolean(L, 1); |
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196 return 1; |
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197 #endif |
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198 } |
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199 |
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200 /* |
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201 * Remove FDs |
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202 */ |
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203 int Ldel(lua_State *L) { |
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204 struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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205 int fd = luaL_checkinteger(L, 2); |
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206 |
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207 #ifdef USE_EPOLL |
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208 |
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209 struct epoll_event event; |
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210 event.data.fd = fd; |
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211 |
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212 int ret = epoll_ctl(state->epoll_fd, EPOLL_CTL_DEL, fd, &event); |
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213 |
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214 if(ret == 0) { |
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215 lua_pushboolean(L, 1); |
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216 return 1; |
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217 } |
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218 else { |
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219 ret = errno; |
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220 lua_pushnil(L); |
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221 lua_pushstring(L, strerror(ret)); |
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222 lua_pushinteger(L, ret); |
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223 return 3; |
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224 } |
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225 |
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226 #else |
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227 |
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228 if(!FD_ISSET(fd, &state->all)) { |
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229 lua_pushnil(L); |
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230 lua_pushstring(L, strerror(ENOENT)); |
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231 lua_pushinteger(L, ENOENT); |
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232 } |
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233 |
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234 FD_CLR(fd, &state->wantread); |
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235 FD_CLR(fd, &state->wantwrite); |
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236 FD_CLR(fd, &state->readable); |
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237 FD_CLR(fd, &state->writable); |
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238 FD_CLR(fd, &state->all); |
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239 FD_CLR(fd, &state->err); |
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240 |
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241 lua_pushboolean(L, 1); |
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242 return 1; |
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243 #endif |
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244 } |
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245 |
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246 |
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247 /* |
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248 * Check previously manipulated event state for FDs ready for reading or writing |
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249 */ |
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250 int Lpushevent(lua_State *L, struct Lpoll_state *state) { |
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251 #ifdef USE_EPOLL |
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252 |
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253 if(state->processed > 0) { |
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254 state->processed--; |
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255 struct epoll_event event = state->events[state->processed]; |
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256 lua_pushinteger(L, event.data.fd); |
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257 lua_pushboolean(L, event.events & (EPOLLIN | EPOLLHUP | EPOLLRDHUP | EPOLLERR)); |
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258 lua_pushboolean(L, event.events & EPOLLOUT); |
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259 return 3; |
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260 } |
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261 |
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262 #else |
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263 |
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264 for(int fd = state->processed + 1; fd < FD_SETSIZE; fd++) { |
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265 if(FD_ISSET(fd, &state->readable) || FD_ISSET(fd, &state->writable) || FD_ISSET(fd, &state->err)) { |
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266 lua_pushinteger(L, fd); |
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267 lua_pushboolean(L, FD_ISSET(fd, &state->readable) | FD_ISSET(fd, &state->err)); |
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268 lua_pushboolean(L, FD_ISSET(fd, &state->writable)); |
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269 FD_CLR(fd, &state->readable); |
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270 FD_CLR(fd, &state->writable); |
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271 FD_CLR(fd, &state->err); |
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272 state->processed = fd; |
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273 return 3; |
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274 } |
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275 } |
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276 |
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277 #endif |
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278 return 0; |
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279 } |
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280 |
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281 /* |
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282 * Wait for event |
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283 */ |
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284 int Lwait(lua_State *L) { |
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285 struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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286 |
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287 int ret = Lpushevent(L, state); |
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288 |
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289 if(ret != 0) { |
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290 return ret; |
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291 } |
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292 |
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293 lua_Number timeout = luaL_checknumber(L, 2); |
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294 luaL_argcheck(L, timeout >= 0, 1, "positive number expected"); |
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295 |
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296 #ifdef USE_EPOLL |
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297 ret = epoll_wait(state->epoll_fd, state->events, MAX_EVENTS, timeout * 1000); |
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298 #else |
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299 /* |
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300 * select(2) mutates the fd_sets passed to it so in order to not |
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301 * have to recreate it manually every time a copy is made. |
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302 */ |
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303 memcpy(&state->readable, &state->wantread, sizeof(fd_set)); |
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304 memcpy(&state->writable, &state->wantwrite, sizeof(fd_set)); |
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305 memcpy(&state->err, &state->all, sizeof(fd_set)); |
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306 |
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307 struct timeval tv; |
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308 tv.tv_sec = (time_t)timeout; |
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309 tv.tv_usec = ((suseconds_t)(timeout * 1000000)) % 1000000; |
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310 |
9437
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311 ret = select(FD_SETSIZE, &state->readable, &state->writable, &state->err, &tv); |
9313
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312 #endif |
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313 |
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314 if(ret == 0) { |
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315 lua_pushnil(L); |
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316 lua_pushstring(L, "timeout"); |
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317 return 2; |
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318 } |
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319 else if(ret < 0) { |
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320 ret = errno; |
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321 lua_pushnil(L); |
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322 lua_pushstring(L, strerror(ret)); |
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323 lua_pushinteger(L, ret); |
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324 return 3; |
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325 } |
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326 |
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327 /* |
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328 * Search for the first ready FD and return it |
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329 */ |
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330 #ifdef USE_EPOLL |
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331 state->processed = ret; |
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332 #else |
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333 state->processed = -1; |
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334 #endif |
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335 return Lpushevent(L, state); |
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336 } |
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337 |
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338 #ifdef USE_EPOLL |
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339 /* |
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340 * Return Epoll FD |
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341 */ |
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342 int Lgetfd(lua_State *L) { |
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343 struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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344 lua_pushinteger(L, state->epoll_fd); |
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345 return 1; |
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346 } |
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347 |
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348 /* |
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349 * Close epoll FD |
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350 */ |
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351 int Lgc(lua_State *L) { |
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352 struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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353 |
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354 if(close(state->epoll_fd) == 0) { |
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355 state->epoll_fd = -1; |
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356 } |
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357 else { |
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358 lua_pushstring(L, strerror(errno)); |
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359 lua_error(L); |
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360 } |
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361 |
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362 return 0; |
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363 } |
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364 #endif |
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365 |
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366 /* |
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367 * String representation |
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368 */ |
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369 int Ltos(lua_State *L) { |
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370 struct Lpoll_state *state = luaL_checkudata(L, 1, STATE_MT); |
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371 lua_pushfstring(L, "%s: %p", STATE_MT, state); |
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372 return 1; |
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373 } |
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374 |
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375 /* |
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376 * Create a new context |
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377 */ |
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378 int Lnew(lua_State *L) { |
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379 /* Allocate state */ |
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380 Lpoll_state *state = lua_newuserdata(L, sizeof(Lpoll_state)); |
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381 luaL_setmetatable(L, STATE_MT); |
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382 |
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383 /* Initialize state */ |
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384 #ifdef USE_EPOLL |
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385 state->epoll_fd = epoll_create1(0); |
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386 state->processed = 0; |
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387 #else |
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388 FD_ZERO(&state->wantread); |
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389 FD_ZERO(&state->wantwrite); |
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390 FD_ZERO(&state->readable); |
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391 FD_ZERO(&state->writable); |
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392 FD_ZERO(&state->all); |
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393 FD_ZERO(&state->err); |
9313
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394 state->processed = FD_SETSIZE; |
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395 #endif |
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396 |
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397 return 1; |
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398 } |
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399 |
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400 /* |
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401 * Open library |
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402 */ |
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403 int luaopen_util_poll(lua_State *L) { |
9318 | 404 #if (LUA_VERSION_NUM > 501) |
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405 luaL_checkversion(L); |
9318 | 406 #endif |
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407 |
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408 luaL_newmetatable(L, STATE_MT); |
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409 { |
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410 |
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411 lua_pushliteral(L, STATE_MT); |
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412 lua_setfield(L, -2, "__name"); |
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413 |
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414 lua_pushcfunction(L, Ltos); |
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415 lua_setfield(L, -2, "__tostring"); |
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416 |
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417 lua_createtable(L, 0, 2); |
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418 { |
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419 lua_pushcfunction(L, Ladd); |
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420 lua_setfield(L, -2, "add"); |
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421 lua_pushcfunction(L, Lset); |
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422 lua_setfield(L, -2, "set"); |
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423 lua_pushcfunction(L, Ldel); |
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424 lua_setfield(L, -2, "del"); |
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425 lua_pushcfunction(L, Lwait); |
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426 lua_setfield(L, -2, "wait"); |
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427 #ifdef USE_EPOLL |
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428 lua_pushcfunction(L, Lgetfd); |
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429 lua_setfield(L, -2, "getfd"); |
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430 #endif |
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431 } |
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432 lua_setfield(L, -2, "__index"); |
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433 |
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434 #ifdef USE_EPOLL |
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435 lua_pushcfunction(L, Lgc); |
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436 lua_setfield(L, -2, "__gc"); |
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437 #endif |
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438 } |
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439 |
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440 lua_createtable(L, 0, 1); |
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441 { |
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442 lua_pushcfunction(L, Lnew); |
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443 lua_setfield(L, -2, "new"); |
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444 } |
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445 return 1; |
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446 } |
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447 |