prosody
d17392022cb2
util-src/signal.c

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util-src/signal.c @ 10805:d17392022cb2

mod_muc: let event handlers modify cloned presence Updates #1533
author JC Brand <jc@opkode.com>
date Wed, 22 Apr 2020 16:12:15 +0200
parent 10799:763bb2ce3f60
child 12575:1f6f05a98fcd
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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
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36 #include "lua.h"
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37 #include "lauxlib.h"
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38
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39 #if (LUA_VERSION_NUM == 501)
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40 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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41 #endif
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42 #if (LUA_VERSION_NUM < 503)
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43 #define lua_isinteger(L, n) lua_isnumber(L, n)
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44 #endif
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45
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46 #ifndef lsig
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47
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48 #define lsig
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49
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50 struct lua_signal {
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51 char *name; /* name of the signal */
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52 int sig; /* the signal */
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53 };
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54
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55 #endif
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56
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57 #define MAX_PENDING_SIGNALS 32
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58
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59 #define LUA_SIGNAL "lua_signal"
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60
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61 static const struct lua_signal lua_signals[] = {
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62 /* ANSI C signals */
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63 #ifdef SIGABRT
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64 {"SIGABRT", SIGABRT},
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65 #endif
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66 #ifdef SIGFPE
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67 {"SIGFPE", SIGFPE},
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68 #endif
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69 #ifdef SIGILL
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70 {"SIGILL", SIGILL},
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71 #endif
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72 #ifdef SIGINT
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73 {"SIGINT", SIGINT},
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74 #endif
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75 #ifdef SIGSEGV
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76 {"SIGSEGV", SIGSEGV},
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77 #endif
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78 #ifdef SIGTERM
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79 {"SIGTERM", SIGTERM},
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80 #endif
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81 /* posix signals */
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82 #ifdef SIGHUP
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83 {"SIGHUP", SIGHUP},
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84 #endif
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85 #ifdef SIGQUIT
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86 {"SIGQUIT", SIGQUIT},
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87 #endif
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88 #ifdef SIGTRAP
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89 {"SIGTRAP", SIGTRAP},
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90 #endif
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91 #ifdef SIGKILL
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92 {"SIGKILL", SIGKILL},
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93 #endif
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94 #ifdef SIGUSR1
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95 {"SIGUSR1", SIGUSR1},
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96 #endif
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97 #ifdef SIGUSR2
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98 {"SIGUSR2", SIGUSR2},
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99 #endif
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100 #ifdef SIGPIPE
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101 {"SIGPIPE", SIGPIPE},
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102 #endif
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103 #ifdef SIGALRM
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104 {"SIGALRM", SIGALRM},
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105 #endif
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106 #ifdef SIGCHLD
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107 {"SIGCHLD", SIGCHLD},
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108 #endif
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109 #ifdef SIGCONT
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110 {"SIGCONT", SIGCONT},
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111 #endif
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112 #ifdef SIGSTOP
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113 {"SIGSTOP", SIGSTOP},
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114 #endif
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115 #ifdef SIGTTIN
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116 {"SIGTTIN", SIGTTIN},
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117 #endif
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118 #ifdef SIGTTOU
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119 {"SIGTTOU", SIGTTOU},
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120 #endif
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121 /* some BSD signals */
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122 #ifdef SIGIOT
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123 {"SIGIOT", SIGIOT},
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124 #endif
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125 #ifdef SIGBUS
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126 {"SIGBUS", SIGBUS},
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127 #endif
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128 #ifdef SIGCLD
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129 {"SIGCLD", SIGCLD},
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130 #endif
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131 #ifdef SIGURG
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132 {"SIGURG", SIGURG},
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133 #endif
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134 #ifdef SIGXCPU
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135 {"SIGXCPU", SIGXCPU},
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136 #endif
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137 #ifdef SIGXFSZ
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138 {"SIGXFSZ", SIGXFSZ},
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139 #endif
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140 #ifdef SIGVTALRM
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141 {"SIGVTALRM", SIGVTALRM},
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142 #endif
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143 #ifdef SIGPROF
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144 {"SIGPROF", SIGPROF},
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145 #endif
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146 #ifdef SIGWINCH
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147 {"SIGWINCH", SIGWINCH},
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148 #endif
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149 #ifdef SIGPOLL
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150 {"SIGPOLL", SIGPOLL},
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151 #endif
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152 #ifdef SIGIO
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153 {"SIGIO", SIGIO},
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154 #endif
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155 /* add odd signals */
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156 #ifdef SIGSTKFLT
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157 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */
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158 #endif
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159 #ifdef SIGSYS
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160 {"SIGSYS", SIGSYS},
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161 #endif
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162 {NULL, 0}
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163 };
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164
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165 static lua_State *Lsig = NULL;
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166 static lua_Hook Hsig = NULL;
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167 static int Hmask = 0;
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168 static int Hcount = 0;
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169
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170 static int signals[MAX_PENDING_SIGNALS];
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171 static int nsig = 0;
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172
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173 static void sighook(lua_State *L, lua_Debug *ar) {
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174 (void)ar;
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175 /* restore the old hook */
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176 lua_sethook(L, Hsig, Hmask, Hcount);
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177
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178 lua_pushstring(L, LUA_SIGNAL);
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179 lua_gettable(L, LUA_REGISTRYINDEX);
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180
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181 for(int i = 0; i < nsig; i++) {
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182 lua_pushinteger(L, signals[i]);
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183 lua_gettable(L, -2);
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184 lua_call(L, 0, 0);
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185 };
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186
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187 nsig = 0;
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188
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189 lua_pop(L, 1); /* pop lua_signal table */
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190
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191 }
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192
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193 static void handle(int sig) {
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194 if(nsig == 0) {
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195 /* Store the existing debug hook (if any) and its parameters */
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196 Hsig = lua_gethook(Lsig);
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197 Hmask = lua_gethookmask(Lsig);
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198 Hcount = lua_gethookcount(Lsig);
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199
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200 /* Set our new debug hook */
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201 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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202 }
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203
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204 if(nsig < MAX_PENDING_SIGNALS) {
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205 signals[nsig++] = sig;
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206 }
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207 }
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208
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209 /*
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210 * l_signal == signal(signal [, func [, chook]])
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211 *
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212 * signal = signal number or string
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213 * func = Lua function to call
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214 * chook = catch within C functions
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215 * if caught, Lua function _must_
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216 * exit, as the stack is most likely
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217 * in an unstable state.
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218 */
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219
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220 static int l_signal(lua_State *L) {
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221 int args = lua_gettop(L);
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222 int t, sig; /* type, signal */
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223
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224 /* get type of signal */
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225 luaL_checkany(L, 1);
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226 t = lua_type(L, 1);
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227
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228 if(t == LUA_TNUMBER) {
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229 sig = (int) lua_tointeger(L, 1);
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230 } else if(t == LUA_TSTRING) {
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231 lua_pushstring(L, LUA_SIGNAL);
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232 lua_gettable(L, LUA_REGISTRYINDEX);
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233 lua_pushvalue(L, 1);
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234 lua_gettable(L, -2);
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235
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236 if(!lua_isinteger(L, -1)) {
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237 return luaL_error(L, "invalid signal string");
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238 }
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239
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240 sig = (int) lua_tointeger(L, -1);
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241 lua_pop(L, 1); /* get rid of number we pushed */
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242 } else {
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243 luaL_checknumber(L, 1); /* will always error, with good error msg */
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244 return luaL_error(L, "unreachable: invalid number was accepted");
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245 }
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246
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247 /* set handler */
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248 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */
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249 lua_pushstring(L, LUA_SIGNAL);
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250 lua_gettable(L, LUA_REGISTRYINDEX);
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251 lua_pushinteger(L, sig);
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252 lua_gettable(L, -2); /* return old handler */
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253 lua_pushinteger(L, sig);
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254 lua_pushnil(L);
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255 lua_settable(L, -4);
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256 lua_remove(L, -2); /* remove LUA_SIGNAL table */
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257 signal(sig, SIG_DFL);
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258 } else {
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259 luaL_checktype(L, 2, LUA_TFUNCTION);
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260
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261 lua_pushstring(L, LUA_SIGNAL);
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262 lua_gettable(L, LUA_REGISTRYINDEX);
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263
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264 lua_pushinteger(L, sig);
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265 lua_pushvalue(L, 2);
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266 lua_settable(L, -3);
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267
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268 /* Set the state for the handler */
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269 Lsig = L;
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270
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271 if(lua_toboolean(L, 3)) { /* c hook? */
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272 if(signal(sig, handle) == SIG_ERR) {
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273 lua_pushboolean(L, 0);
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274 } else {
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275 lua_pushboolean(L, 1);
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276 }
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277 } else { /* lua_hook */
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278 if(signal(sig, handle) == SIG_ERR) {
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279 lua_pushboolean(L, 0);
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280 } else {
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281 lua_pushboolean(L, 1);
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282 }
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283 }
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284 }
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285
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286 return 1;
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287 }
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288
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289 /*
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290 * l_raise == raise(signal)
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291 *
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292 * signal = signal number or string
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293 */
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294
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295 static int l_raise(lua_State *L) {
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296 /* int args = lua_gettop(L); */
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297 int t = 0; /* type */
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298 lua_Integer ret;
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299
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300 luaL_checkany(L, 1);
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301
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302 t = lua_type(L, 1);
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303
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304 if(t == LUA_TNUMBER) {
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305 ret = (lua_Integer) raise((int) lua_tointeger(L, 1));
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306 lua_pushinteger(L, ret);
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307 } else if(t == LUA_TSTRING) {
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308 lua_pushstring(L, LUA_SIGNAL);
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309 lua_gettable(L, LUA_REGISTRYINDEX);
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310 lua_pushvalue(L, 1);
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311 lua_gettable(L, -2);
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312
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313 if(!lua_isnumber(L, -1)) {
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314 return luaL_error(L, "invalid signal string");
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315 }
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316
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317 ret = (lua_Integer) raise((int) lua_tointeger(L, -1));
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318 lua_pop(L, 1); /* get rid of number we pushed */
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319 lua_pushinteger(L, ret);
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320 } else {
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321 luaL_checknumber(L, 1); /* will always error, with good error msg */
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322 }
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323
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324 return 1;
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325 }
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326
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327 #if defined(__unix__) || defined(__APPLE__)
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328
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329 /* define some posix only functions */
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330
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331 /*
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332 * l_kill == kill(pid, signal)
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333 *
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334 * pid = process id
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335 * signal = signal number or string
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336 */
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337
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338 static int l_kill(lua_State *L) {
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339 int t; /* type */
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340 lua_Integer ret; /* return value */
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341
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342 luaL_checknumber(L, 1); /* must be int for pid */
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343 luaL_checkany(L, 2); /* check for a second arg */
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344
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345 t = lua_type(L, 2);
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346
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347 if(t == LUA_TNUMBER) {
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348 ret = (lua_Integer) kill((int) lua_tointeger(L, 1),
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349 (int) lua_tointeger(L, 2));
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350 lua_pushinteger(L, ret);
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351 } else if(t == LUA_TSTRING) {
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352 lua_pushstring(L, LUA_SIGNAL);
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353 lua_gettable(L, LUA_REGISTRYINDEX);
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354 lua_pushvalue(L, 2);
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355 lua_gettable(L, -2);
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356
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357 if(!lua_isnumber(L, -1)) {
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358 return luaL_error(L, "invalid signal string");
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359 }
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360
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361 ret = (lua_Integer) kill((int) lua_tointeger(L, 1),
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362 (int) lua_tointeger(L, -1));
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363 lua_pop(L, 1); /* get rid of number we pushed */
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364 lua_pushinteger(L, ret);
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365 } else {
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366 luaL_checknumber(L, 2); /* will always error, with good error msg */
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367 }
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368
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369 return 1;
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370 }
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371
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372 #endif
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373
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374 static const struct luaL_Reg lsignal_lib[] = {
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375 {"signal", l_signal},
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376 {"raise", l_raise},
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377 #if defined(__unix__) || defined(__APPLE__)
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378 {"kill", l_kill},
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379 #endif
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380 {NULL, NULL}
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381 };
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382
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383 int luaopen_util_signal(lua_State *L) {
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384 #if (LUA_VERSION_NUM > 501)
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385 luaL_checkversion(L);
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386 #endif
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387 int i = 0;
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388
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389 /* add the library */
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390 lua_newtable(L);
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391 luaL_setfuncs(L, lsignal_lib, 0);
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392
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393 /* push lua_signals table into the registry */
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394 /* put the signals inside the library table too,
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395 * they are only a reference */
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396 lua_pushstring(L, LUA_SIGNAL);
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397 lua_newtable(L);
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398
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399 while(lua_signals[i].name != NULL) {
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400 /* registry table */
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401 lua_pushstring(L, lua_signals[i].name);
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402 lua_pushinteger(L, lua_signals[i].sig);
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403 lua_settable(L, -3);
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404 /* signal table */
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405 lua_pushstring(L, lua_signals[i].name);
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406 lua_pushinteger(L, lua_signals[i].sig);
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407 lua_settable(L, -5);
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408 i++;
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409 }
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410
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411 /* add newtable to the registry */
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412 lua_settable(L, LUA_REGISTRYINDEX);
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413
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414 return 1;
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415 }