prosody
2f78ea5d0f11
util-src/lsignal.c

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util-src/lsignal.c @ 1822:2f78ea5d0f11

net.dns: Remove elements from the cache when expired so as to not leave holes in the array
author Matthew Wild <mwild1@gmail.com>
date Thu, 24 Sep 2009 23:46:12 +0100
parent 988:8cb9a0d59e78
child 1841:0dc1daa94e7f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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988
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1 /*
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2 * lsignal.h -- Signal Handler Library for Lua
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3 *
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4 * Version: 1.000
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5 *
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6 * Copyright (C) 2007 Patrick J. Donnelly (batrick@unm.edu)
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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 #include <signal.h>
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30
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31 #include "lua.h"
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32 #include "lauxlib.h"
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33
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34 #ifndef lsig
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35
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36 #define lsig
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37
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38 struct lua_signal
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39 {
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40 char *name; /* name of the signal */
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41 int sig; /* the signal */
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42 };
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43
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44 #endif
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45
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46 #define LUA_SIGNAL "lua_signal"
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47
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48 static const struct lua_signal lua_signals[] = {
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49 /* ANSI C signals */
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50 #ifdef SIGABRT
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51 {"SIGABRT", SIGABRT},
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52 #endif
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53 #ifdef SIGFPE
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54 {"SIGFPE", SIGFPE},
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55 #endif
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56 #ifdef SIGILL
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57 {"SIGILL", SIGILL},
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58 #endif
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59 #ifdef SIGINT
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60 {"SIGINT", SIGINT},
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61 #endif
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62 #ifdef SIGSEGV
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63 {"SIGSEGV", SIGSEGV},
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64 #endif
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65 #ifdef SIGTERM
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66 {"SIGTERM", SIGTERM},
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67 #endif
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68 /* posix signals */
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69 #ifdef SIGHUP
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70 {"SIGHUP", SIGHUP},
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71 #endif
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72 #ifdef SIGQUIT
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73 {"SIGQUIT", SIGQUIT},
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74 #endif
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75 #ifdef SIGTRAP
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76 {"SIGTRAP", SIGTRAP},
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77 #endif
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78 #ifdef SIGKILL
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79 {"SIGKILL", SIGKILL},
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80 #endif
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81 #ifdef SIGUSR1
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82 {"SIGUSR1", SIGUSR1},
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83 #endif
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84 #ifdef SIGUSR2
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85 {"SIGUSR2", SIGUSR2},
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86 #endif
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87 #ifdef SIGPIPE
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88 {"SIGPIPE", SIGPIPE},
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89 #endif
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90 #ifdef SIGALRM
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91 {"SIGALRM", SIGALRM},
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92 #endif
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93 #ifdef SIGCHLD
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94 {"SIGCHLD", SIGCHLD},
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95 #endif
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96 #ifdef SIGCONT
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97 {"SIGCONT", SIGCONT},
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98 #endif
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99 #ifdef SIGSTOP
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100 {"SIGSTOP", SIGSTOP},
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101 #endif
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102 #ifdef SIGTTIN
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103 {"SIGTTIN", SIGTTIN},
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104 #endif
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105 #ifdef SIGTTOU
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106 {"SIGTTOU", SIGTTOU},
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107 #endif
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108 /* some BSD signals */
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109 #ifdef SIGIOT
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110 {"SIGIOT", SIGIOT},
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111 #endif
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112 #ifdef SIGBUS
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113 {"SIGBUS", SIGBUS},
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114 #endif
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115 #ifdef SIGCLD
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116 {"SIGCLD", SIGCLD},
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117 #endif
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118 #ifdef SIGURG
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119 {"SIGURG", SIGURG},
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120 #endif
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121 #ifdef SIGXCPU
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122 {"SIGXCPU", SIGXCPU},
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123 #endif
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124 #ifdef SIGXFSZ
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125 {"SIGXFSZ", SIGXFSZ},
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126 #endif
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127 #ifdef SIGVTALRM
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128 {"SIGVTALRM", SIGVTALRM},
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129 #endif
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130 #ifdef SIGPROF
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131 {"SIGPROF", SIGPROF},
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132 #endif
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133 #ifdef SIGWINCH
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134 {"SIGWINCH", SIGWINCH},
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135 #endif
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136 #ifdef SIGPOLL
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137 {"SIGPOLL", SIGPOLL},
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138 #endif
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139 #ifdef SIGIO
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140 {"SIGIO", SIGIO},
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141 #endif
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142 /* add odd signals */
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143 #ifdef SIGSTKFLT
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144 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */
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145 #endif
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146 #ifdef SIGSYS
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147 {"SIGSYS", SIGSYS},
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148 #endif
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149 {NULL, 0}
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150 };
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151
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152 static int Nsig = 0;
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153 static lua_State *Lsig = NULL;
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154 static lua_Hook Hsig = NULL;
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155 static int Hmask = 0;
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156 static int Hcount = 0;
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157
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158 static void sighook(lua_State *L, lua_Debug *ar)
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159 {
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160 lua_pushstring(L, LUA_SIGNAL);
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161 lua_gettable(L, LUA_REGISTRYINDEX);
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162 lua_pushnumber(L, Nsig);
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163 lua_gettable(L, -2);
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164
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165 lua_call(L, 0, 0);
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166
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167 /* set the old hook */
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168 lua_sethook(L, Hsig, Hmask, Hcount);
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169 }
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170
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171 static void handle(int sig)
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172 {
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173 Hsig = lua_gethook(Lsig);
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174 Hmask = lua_gethookmask(Lsig);
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175 Hcount = lua_gethookcount(Lsig);
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176 Nsig = sig;
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177
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178 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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179 /*
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180 switch (sig)
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181 {
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182 case SIGABRT: ;
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183 case SIGFPE: ;
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184 case SIGILL: ;
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185 case SIGINT: ;
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186 case SIGSEGV: ;
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187 case SIGTERM: ;
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188 } */
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189 }
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190
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191 /*
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192 * l_signal == signal(signal [, func [, chook]])
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193 *
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194 * signal = signal number or string
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195 * func = Lua function to call
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196 * chook = catch within C functions
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197 * if caught, Lua function _must_
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198 * exit, as the stack is most likely
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199 * in an unstable state.
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200 */
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201
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202 static int l_signal(lua_State *L)
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203 {
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204 int args = lua_gettop(L);
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205 int t, sig; /* type, signal */
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206
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207 /* get type of signal */
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208 luaL_checkany(L, 1);
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209 t = lua_type(L, 1);
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210 if (t == LUA_TNUMBER)
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211 sig = (int) lua_tonumber(L, 1);
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212 else if (t == LUA_TSTRING)
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213 {
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214 lua_pushstring(L, LUA_SIGNAL);
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215 lua_gettable(L, LUA_REGISTRYINDEX);
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216 lua_pushvalue(L, 1);
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217 lua_gettable(L, -2);
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218 if (!lua_isnumber(L, -1))
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219 luaL_error(L, "invalid signal string");
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220 sig = (int) lua_tonumber(L, -1);
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221 lua_pop(L, 1); /* get rid of number we pushed */
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222 } else
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223 luaL_checknumber(L, 1); /* will always error, with good error msg */
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224
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225 /* set handler */
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226 if (args == 1 || lua_isnil(L, 2)) /* clear handler */
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227 {
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228 lua_pushstring(L, LUA_SIGNAL);
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229 lua_gettable(L, LUA_REGISTRYINDEX);
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230 lua_pushnumber(L, sig);
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231 lua_gettable(L, -2); /* return old handler */
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232 lua_pushnumber(L, sig);
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233 lua_pushnil(L);
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234 lua_settable(L, -4);
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235 lua_remove(L, -2); /* remove LUA_SIGNAL table */
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236 signal(sig, SIG_DFL);
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237 } else
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238 {
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239 luaL_checktype(L, 2, LUA_TFUNCTION);
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240
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241 lua_pushstring(L, LUA_SIGNAL);
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242 lua_gettable(L, LUA_REGISTRYINDEX);
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243
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244 lua_pushnumber(L, sig);
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245 lua_pushvalue(L, 2);
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246 lua_settable(L, -3);
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247
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248 /* Set the state for the handler */
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249 Lsig = L;
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250
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251 if (lua_toboolean(L, 3)) /* c hook? */
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252 {
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253 if (signal(sig, handle) == SIG_ERR)
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254 lua_pushboolean(L, 0);
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255 else
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256 lua_pushboolean(L, 1);
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257 } else /* lua_hook */
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258 {
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259 if (signal(sig, handle) == SIG_ERR)
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260 lua_pushboolean(L, 0);
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261 else
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262 lua_pushboolean(L, 1);
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263 }
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264 }
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265 return 1;
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266 }
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267
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268 /*
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269 * l_raise == raise(signal)
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270 *
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271 * signal = signal number or string
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272 */
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273
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274 static int l_raise(lua_State *L)
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275 {
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276 /* int args = lua_gettop(L); */
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277 int t = 0; /* type */
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278 lua_Number ret;
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279
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280 luaL_checkany(L, 1);
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281
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282 t = lua_type(L, 1);
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283 if (t == LUA_TNUMBER)
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284 {
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285 ret = (lua_Number) raise((int) lua_tonumber(L, 1));
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286 lua_pushnumber(L, ret);
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287 } else if (t == LUA_TSTRING)
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288 {
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289 lua_pushstring(L, LUA_SIGNAL);
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290 lua_gettable(L, LUA_REGISTRYINDEX);
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291 lua_pushvalue(L, 1);
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292 lua_gettable(L, -2);
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293 if (!lua_isnumber(L, -1))
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294 luaL_error(L, "invalid signal string");
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295 ret = (lua_Number) raise((int) lua_tonumber(L, -1));
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296 lua_pop(L, 1); /* get rid of number we pushed */
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297 lua_pushnumber(L, ret);
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298 } else
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299 luaL_checknumber(L, 1); /* will always error, with good error msg */
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300
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301 return 1;
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302 }
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303
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304 #ifdef _POSIX_SOURCE
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305
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306 /* define some posix only functions */
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307
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308 /*
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309 * l_kill == kill(pid, signal)
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310 *
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311 * pid = process id
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312 * signal = signal number or string
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313 */
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314
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315 static int l_kill(lua_State *L)
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316 {
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317 int t; /* type */
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318 lua_Number ret; /* return value */
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319
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320 luaL_checknumber(L, 1); /* must be int for pid */
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321 luaL_checkany(L, 2); /* check for a second arg */
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322
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323 t = lua_type(L, 2);
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324 if (t == LUA_TNUMBER)
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325 {
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326 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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327 (int) lua_tonumber(L, 2));
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328 lua_pushnumber(L, ret);
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329 } else if (t == LUA_TSTRING)
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330 {
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331 lua_pushstring(L, LUA_SIGNAL);
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332 lua_gettable(L, LUA_REGISTRYINDEX);
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333 lua_pushvalue(L, 2);
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334 lua_gettable(L, -2);
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335 if (!lua_isnumber(L, -1))
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336 luaL_error(L, "invalid signal string");
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337 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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338 (int) lua_tonumber(L, -1));
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339 lua_pop(L, 1); /* get rid of number we pushed */
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340 lua_pushnumber(L, ret);
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341 } else
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342 luaL_checknumber(L, 2); /* will always error, with good error msg */
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343 return 1;
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344 }
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345
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346 #endif
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347
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348 static const struct luaL_Reg lsignal_lib[] = {
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349 {"signal", l_signal},
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350 {"raise", l_raise},
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351 #ifdef _POSIX_SOURCE
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352 {"kill", l_kill},
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353 #endif
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354 {NULL, NULL}
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355 };
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356
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357 int luaopen_util_signal(lua_State *L)
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358 {
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359 int i = 0;
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360
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361 /* add the library */
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362 luaL_register(L, "signal", lsignal_lib);
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363
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364 /* push lua_signals table into the registry */
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365 /* put the signals inside the library table too,
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366 * they are only a reference */
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367 lua_pushstring(L, LUA_SIGNAL);
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368 lua_createtable(L, 0, 0);
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369
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370 while (lua_signals[i].name != NULL)
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371 {
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372 /* registry table */
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373 lua_pushstring(L, lua_signals[i].name);
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374 lua_pushnumber(L, lua_signals[i].sig);
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375 lua_settable(L, -3);
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376 /* signal table */
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377 lua_pushstring(L, lua_signals[i].name);
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378 lua_pushnumber(L, lua_signals[i].sig);
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379 lua_settable(L, -5);
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380 i++;
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381 }
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382
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383 /* add newtable to the registry */
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384 lua_settable(L, LUA_REGISTRYINDEX);
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385
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386 return 1;
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387 }