Annotate

util-src/signal.c @ 13439:1e229d710a3c

util.signal: Add support for signalfd(2) on Linux signalfd allows handling signal events using the same method as sockets, via file descriptors. Thus all signal dispatch can go through the same main event loop as everything else, removing need for thread-scary signal handling where execution would just jump to the signal handler regardless of the state of Lua, and needing to keep track of Lua states/threads.
author Kim Alvefur <zash@zash.se>
date Sat, 24 Feb 2024 00:05:29 +0100
parent 12976:a187600ec7d6
child 13441:6d96b6eeee5a
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1 /*
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2 * signal.c -- Signal Handler Library for Lua
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3 *
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4 * Version: 1.000+changes
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5 *
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6 * Copyright (C) 2007 Patrick J. Donnelly (batrick@batbytes.com)
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7 *
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8 * This software is distributed under the same license as Lua 5.0:
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9 *
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10 * Permission is hereby granted, free of charge, to any person obtaining a
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11 * copy of this software and associated documentation files (the "Software"),
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12 * to deal in the Software without restriction, including without limitation
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13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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14 * and/or sell copies of the Software, and to permit persons to whom the
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15 * Software is furnished to do so, subject to the following conditions:
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16 *
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17 * The above copyright notice and this permission notice shall be included
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18 * in all copies or substantial portions of the Software.
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19 *
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20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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26 * OTHER DEALINGS IN THE SOFTWARE.
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27 */
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28
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29 #ifndef _GNU_SOURCE
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30 #define _GNU_SOURCE
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31 #endif
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32
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33 #include <signal.h>
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34 #include <stdlib.h>
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35 #ifdef __linux__
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36 #include <unistd.h>
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37 #include <sys/signalfd.h>
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38 #endif
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39
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40 #include "lua.h"
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41 #include "lauxlib.h"
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42
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43 #if (LUA_VERSION_NUM < 503)
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44 #define lua_isinteger(L, n) lua_isnumber(L, n)
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45 #endif
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46
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47 #ifndef lsig
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48
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49 #define lsig
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50
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51 struct lua_signal {
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52 char *name; /* name of the signal */
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53 int sig; /* the signal */
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54 };
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55
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56 #endif
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57
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58 #define MAX_PENDING_SIGNALS 32
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59
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60 #define LUA_SIGNAL "lua_signal"
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61
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62 static const struct lua_signal lua_signals[] = {
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63 /* ANSI C signals */
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64 #ifdef SIGABRT
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65 {"SIGABRT", SIGABRT},
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66 #endif
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67 #ifdef SIGFPE
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68 {"SIGFPE", SIGFPE},
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69 #endif
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70 #ifdef SIGILL
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71 {"SIGILL", SIGILL},
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72 #endif
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73 #ifdef SIGINT
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74 {"SIGINT", SIGINT},
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75 #endif
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76 #ifdef SIGSEGV
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77 {"SIGSEGV", SIGSEGV},
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78 #endif
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79 #ifdef SIGTERM
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80 {"SIGTERM", SIGTERM},
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81 #endif
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82 /* posix signals */
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83 #ifdef SIGHUP
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84 {"SIGHUP", SIGHUP},
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85 #endif
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86 #ifdef SIGQUIT
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87 {"SIGQUIT", SIGQUIT},
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88 #endif
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89 #ifdef SIGTRAP
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90 {"SIGTRAP", SIGTRAP},
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91 #endif
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92 #ifdef SIGKILL
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93 {"SIGKILL", SIGKILL},
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94 #endif
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95 #ifdef SIGUSR1
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96 {"SIGUSR1", SIGUSR1},
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97 #endif
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98 #ifdef SIGUSR2
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99 {"SIGUSR2", SIGUSR2},
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100 #endif
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101 #ifdef SIGPIPE
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102 {"SIGPIPE", SIGPIPE},
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103 #endif
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104 #ifdef SIGALRM
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105 {"SIGALRM", SIGALRM},
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106 #endif
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107 #ifdef SIGCHLD
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108 {"SIGCHLD", SIGCHLD},
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109 #endif
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110 #ifdef SIGCONT
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111 {"SIGCONT", SIGCONT},
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112 #endif
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113 #ifdef SIGSTOP
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114 {"SIGSTOP", SIGSTOP},
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115 #endif
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116 #ifdef SIGTTIN
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117 {"SIGTTIN", SIGTTIN},
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118 #endif
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119 #ifdef SIGTTOU
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120 {"SIGTTOU", SIGTTOU},
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121 #endif
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122 /* some BSD signals */
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123 #ifdef SIGIOT
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124 {"SIGIOT", SIGIOT},
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125 #endif
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126 #ifdef SIGBUS
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127 {"SIGBUS", SIGBUS},
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128 #endif
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129 #ifdef SIGCLD
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130 {"SIGCLD", SIGCLD},
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131 #endif
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132 #ifdef SIGURG
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133 {"SIGURG", SIGURG},
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134 #endif
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135 #ifdef SIGXCPU
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136 {"SIGXCPU", SIGXCPU},
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137 #endif
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138 #ifdef SIGXFSZ
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139 {"SIGXFSZ", SIGXFSZ},
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140 #endif
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141 #ifdef SIGVTALRM
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142 {"SIGVTALRM", SIGVTALRM},
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143 #endif
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144 #ifdef SIGPROF
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145 {"SIGPROF", SIGPROF},
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146 #endif
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147 #ifdef SIGWINCH
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148 {"SIGWINCH", SIGWINCH},
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149 #endif
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150 #ifdef SIGPOLL
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151 {"SIGPOLL", SIGPOLL},
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152 #endif
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153 #ifdef SIGIO
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154 {"SIGIO", SIGIO},
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155 #endif
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156 /* add odd signals */
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157 #ifdef SIGSTKFLT
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158 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */
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159 #endif
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160 #ifdef SIGSYS
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161 {"SIGSYS", SIGSYS},
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162 #endif
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163 {NULL, 0}
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164 };
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165
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166 static lua_State *Lsig = NULL;
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167 static lua_Hook Hsig = NULL;
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168 static int Hmask = 0;
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169 static int Hcount = 0;
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170
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171 static int signals[MAX_PENDING_SIGNALS];
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172 static int nsig = 0;
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173
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174 static void sighook(lua_State *L, lua_Debug *ar) {
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175 (void)ar;
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176 /* restore the old hook */
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177 lua_sethook(L, Hsig, Hmask, Hcount);
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178
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179 lua_pushstring(L, LUA_SIGNAL);
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180 lua_gettable(L, LUA_REGISTRYINDEX);
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181
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182 for(int i = 0; i < nsig; i++) {
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183 lua_pushinteger(L, signals[i]);
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184 lua_gettable(L, -2);
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185 lua_call(L, 0, 0);
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186 };
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187
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188 nsig = 0;
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189
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190 lua_pop(L, 1); /* pop lua_signal table */
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191
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192 }
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193
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194 static void handle(int sig) {
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195 if(nsig == 0) {
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196 /* Store the existing debug hook (if any) and its parameters */
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197 Hsig = lua_gethook(Lsig);
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198 Hmask = lua_gethookmask(Lsig);
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199 Hcount = lua_gethookcount(Lsig);
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200
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201 /* Set our new debug hook */
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202 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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203 }
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204
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205 if(nsig < MAX_PENDING_SIGNALS) {
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206 signals[nsig++] = sig;
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207 }
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208 }
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209
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210 /*
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211 * l_signal == signal(signal [, func [, chook]])
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212 *
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213 * signal = signal number or string
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214 * func = Lua function to call
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215 * chook = catch within C functions
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216 * if caught, Lua function _must_
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217 * exit, as the stack is most likely
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218 * in an unstable state.
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219 */
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220
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221 static int l_signal(lua_State *L) {
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222 int args = lua_gettop(L);
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223 int t, sig; /* type, signal */
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224
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225 /* get type of signal */
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226 luaL_checkany(L, 1);
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227 t = lua_type(L, 1);
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228
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229 if(t == LUA_TNUMBER) {
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230 sig = (int) lua_tointeger(L, 1);
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231 } else if(t == LUA_TSTRING) {
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232 lua_pushstring(L, LUA_SIGNAL);
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233 lua_gettable(L, LUA_REGISTRYINDEX);
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234 lua_pushvalue(L, 1);
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235 lua_gettable(L, -2);
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236
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237 if(!lua_isinteger(L, -1)) {
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238 return luaL_error(L, "invalid signal string");
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239 }
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240
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241 sig = (int) lua_tointeger(L, -1);
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242 lua_pop(L, 1); /* get rid of number we pushed */
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243 } else {
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244 luaL_checknumber(L, 1); /* will always error, with good error msg */
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245 return luaL_error(L, "unreachable: invalid number was accepted");
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246 }
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247
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248 /* set handler */
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249 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */
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250 lua_pushstring(L, LUA_SIGNAL);
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251 lua_gettable(L, LUA_REGISTRYINDEX);
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252 lua_pushinteger(L, sig);
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253 lua_gettable(L, -2); /* return old handler */
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254 lua_pushinteger(L, sig);
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255 lua_pushnil(L);
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256 lua_settable(L, -4);
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257 lua_remove(L, -2); /* remove LUA_SIGNAL table */
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258 signal(sig, SIG_DFL);
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259 } else {
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260 luaL_checktype(L, 2, LUA_TFUNCTION);
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261
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262 lua_pushstring(L, LUA_SIGNAL);
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263 lua_gettable(L, LUA_REGISTRYINDEX);
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264
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265 lua_pushinteger(L, sig);
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266 lua_pushvalue(L, 2);
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267 lua_settable(L, -3);
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268
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269 /* Set the state for the handler */
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270 Lsig = L;
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271
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272 if(lua_toboolean(L, 3)) { /* c hook? */
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273 if(signal(sig, handle) == SIG_ERR) {
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274 lua_pushboolean(L, 0);
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275 } else {
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276 lua_pushboolean(L, 1);
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277 }
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278 } else { /* lua_hook */
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279 if(signal(sig, handle) == SIG_ERR) {
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280 lua_pushboolean(L, 0);
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281 } else {
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282 lua_pushboolean(L, 1);
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283 }
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284 }
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285 }
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286
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287 return 1;
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288 }
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289
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290 /*
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291 * l_raise == raise(signal)
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292 *
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293 * signal = signal number or string
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294 */
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295
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296 static int l_raise(lua_State *L) {
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297 /* int args = lua_gettop(L); */
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298 int t = 0; /* type */
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299 lua_Integer ret;
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300
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301 luaL_checkany(L, 1);
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302
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303 t = lua_type(L, 1);
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304
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305 if(t == LUA_TNUMBER) {
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306 ret = (lua_Integer) raise((int) lua_tointeger(L, 1));
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307 lua_pushinteger(L, ret);
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308 } else if(t == LUA_TSTRING) {
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309 lua_pushstring(L, LUA_SIGNAL);
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310 lua_gettable(L, LUA_REGISTRYINDEX);
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311 lua_pushvalue(L, 1);
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312 lua_gettable(L, -2);
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313
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314 if(!lua_isnumber(L, -1)) {
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315 return luaL_error(L, "invalid signal string");
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316 }
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317
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318 ret = (lua_Integer) raise((int) lua_tointeger(L, -1));
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319 lua_pop(L, 1); /* get rid of number we pushed */
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320 lua_pushinteger(L, ret);
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321 } else {
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322 luaL_checknumber(L, 1); /* will always error, with good error msg */
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323 }
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324
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325 return 1;
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326 }
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327
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328 #if defined(__unix__) || defined(__APPLE__)
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329
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330 /* define some posix only functions */
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331
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332 /*
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333 * l_kill == kill(pid, signal)
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334 *
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335 * pid = process id
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336 * signal = signal number or string
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337 */
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338
7889
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339 static int l_kill(lua_State *L) {
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340 int t; /* type */
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341 lua_Integer ret; /* return value */
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342
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343 luaL_checknumber(L, 1); /* must be int for pid */
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344 luaL_checkany(L, 2); /* check for a second arg */
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345
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346 t = lua_type(L, 2);
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347
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348 if(t == LUA_TNUMBER) {
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349 ret = (lua_Integer) kill((int) lua_tointeger(L, 1),
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350 (int) lua_tointeger(L, 2));
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351 lua_pushinteger(L, ret);
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352 } else if(t == LUA_TSTRING) {
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353 lua_pushstring(L, LUA_SIGNAL);
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354 lua_gettable(L, LUA_REGISTRYINDEX);
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355 lua_pushvalue(L, 2);
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356 lua_gettable(L, -2);
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357
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358 if(!lua_isnumber(L, -1)) {
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359 return luaL_error(L, "invalid signal string");
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360 }
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361
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362 ret = (lua_Integer) kill((int) lua_tointeger(L, 1),
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363 (int) lua_tointeger(L, -1));
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364 lua_pop(L, 1); /* get rid of number we pushed */
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365 lua_pushinteger(L, ret);
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366 } else {
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367 luaL_checknumber(L, 2); /* will always error, with good error msg */
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368 }
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369
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370 return 1;
988
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371 }
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372
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373 #endif
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374
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375 #ifdef __linux__
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376 static int l_signalfd(lua_State *L) {
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377 sigset_t mask;
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378
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379 sigemptyset(&mask);
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380 sigaddset(&mask, luaL_checkinteger(L, 1));
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381
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382 sigprocmask(SIG_BLOCK, &mask, NULL); /* TODO check err */
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383
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384 lua_pushinteger(L, signalfd(-1, &mask, SFD_NONBLOCK));
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385 return 1;
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386 }
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387
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diff changeset
388 static int l_signalfd_read(lua_State *L) {
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389 const int sigfd = luaL_checkinteger(L, 1);
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diff changeset
390 struct signalfd_siginfo siginfo;
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391
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diff changeset
392 if(read(sigfd, &siginfo, sizeof(siginfo)) < 0) {
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393 return 0;
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394 }
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395
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396 lua_pushinteger(L, siginfo.ssi_signo);
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397 return 1;
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398 }
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diff changeset
399 #endif
1e229d710a3c util.signal: Add support for signalfd(2) on Linux
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400
988
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401 static const struct luaL_Reg lsignal_lib[] = {
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402 {"signal", l_signal},
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403 {"raise", l_raise},
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404 #if defined(__unix__) || defined(__APPLE__)
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405 {"kill", l_kill},
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406 #endif
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407 #ifdef __linux__
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408 {"signalfd", l_signalfd},
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409 {"signalfd_read", l_signalfd_read},
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diff changeset
410 #endif
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411 {NULL, NULL}
988
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412 };
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
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diff changeset
413
12976
a187600ec7d6 util: Add compat for prosody module name change to C sources
Kim Alvefur <zash@zash.se>
parents: 12575
diff changeset
414 int luaopen_prosody_util_signal(lua_State *L) {
7818
54669df178c2 util-src: Make C modules assert that the Lua runtime matches what it was compiled for
Kim Alvefur <zash@zash.se>
parents: 6789
diff changeset
415 luaL_checkversion(L);
6615
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diff changeset
416 int i = 0;
988
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diff changeset
417
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418 /* add the library */
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diff changeset
419 lua_newtable(L);
6789
6b180e77c97a util-src/*.c: Invert Lua 5.2 compat to be 5.2+ by default and a macro to support 5.1
Kim Alvefur <zash@zash.se>
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420 luaL_setfuncs(L, lsignal_lib, 0);
988
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421
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diff changeset
422 /* push lua_signals table into the registry */
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diff changeset
423 /* put the signals inside the library table too,
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Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
424 * they are only a reference */
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
425 lua_pushstring(L, LUA_SIGNAL);
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
426 lua_newtable(L);
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
427
6615
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
428 while(lua_signals[i].name != NULL) {
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
429 /* registry table */
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
430 lua_pushstring(L, lua_signals[i].name);
10799
763bb2ce3f60 util.pposix,signal: Pass around various OS numbers as integers [Lua 5.3]
Kim Alvefur <zash@zash.se>
parents: 10480
diff changeset
431 lua_pushinteger(L, lua_signals[i].sig);
6615
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
432 lua_settable(L, -3);
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
433 /* signal table */
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
434 lua_pushstring(L, lua_signals[i].name);
10799
763bb2ce3f60 util.pposix,signal: Pass around various OS numbers as integers [Lua 5.3]
Kim Alvefur <zash@zash.se>
parents: 10480
diff changeset
435 lua_pushinteger(L, lua_signals[i].sig);
6615
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
436 lua_settable(L, -5);
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
437 i++;
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
438 }
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
439
6615
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
440 /* add newtable to the registry */
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
441 lua_settable(L, LUA_REGISTRYINDEX);
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
442
6615
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
443 return 1;
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
444 }
12976
a187600ec7d6 util: Add compat for prosody module name change to C sources
Kim Alvefur <zash@zash.se>
parents: 12575
diff changeset
445 int luaopen_util_signal(lua_State *L) {
a187600ec7d6 util: Add compat for prosody module name change to C sources
Kim Alvefur <zash@zash.se>
parents: 12575
diff changeset
446 return luaopen_prosody_util_signal(L);
a187600ec7d6 util: Add compat for prosody module name change to C sources
Kim Alvefur <zash@zash.se>
parents: 12575
diff changeset
447 }