prosody
37d67b5f9768
util-src/signal.c

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util-src/signal.c @ 13233:37d67b5f9768

mod_muc: Use enum config API for 'restrict_room_creation' This communicates the accepted values in case the config diverges from them. Note that older documentation used an "admin" value behaving like an alias to true, but this is no longer handled. Should it?
author Kim Alvefur <zash@zash.se>
date Fri, 21 Jul 2023 22:49:01 +0200
parent 12976:a187600ec7d6
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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 < 503)
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40 #define lua_isinteger(L, n) lua_isnumber(L, n)
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41 #endif
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42
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43 #ifndef lsig
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45 #define lsig
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46
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47 struct lua_signal {
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48 char *name; /* name of the signal */
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49 int sig; /* the signal */
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50 };
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51
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52 #endif
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53
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54 #define MAX_PENDING_SIGNALS 32
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55
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56 #define LUA_SIGNAL "lua_signal"
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57
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58 static const struct lua_signal lua_signals[] = {
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59 /* ANSI C signals */
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60 #ifdef SIGABRT
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61 {"SIGABRT", SIGABRT},
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62 #endif
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63 #ifdef SIGFPE
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64 {"SIGFPE", SIGFPE},
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65 #endif
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66 #ifdef SIGILL
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67 {"SIGILL", SIGILL},
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68 #endif
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69 #ifdef SIGINT
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70 {"SIGINT", SIGINT},
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71 #endif
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72 #ifdef SIGSEGV
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73 {"SIGSEGV", SIGSEGV},
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74 #endif
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75 #ifdef SIGTERM
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76 {"SIGTERM", SIGTERM},
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77 #endif
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78 /* posix signals */
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79 #ifdef SIGHUP
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80 {"SIGHUP", SIGHUP},
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81 #endif
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82 #ifdef SIGQUIT
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83 {"SIGQUIT", SIGQUIT},
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84 #endif
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85 #ifdef SIGTRAP
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86 {"SIGTRAP", SIGTRAP},
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87 #endif
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88 #ifdef SIGKILL
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89 {"SIGKILL", SIGKILL},
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90 #endif
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91 #ifdef SIGUSR1
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92 {"SIGUSR1", SIGUSR1},
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93 #endif
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94 #ifdef SIGUSR2
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95 {"SIGUSR2", SIGUSR2},
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96 #endif
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97 #ifdef SIGPIPE
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98 {"SIGPIPE", SIGPIPE},
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99 #endif
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100 #ifdef SIGALRM
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101 {"SIGALRM", SIGALRM},
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102 #endif
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103 #ifdef SIGCHLD
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104 {"SIGCHLD", SIGCHLD},
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105 #endif
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106 #ifdef SIGCONT
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107 {"SIGCONT", SIGCONT},
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108 #endif
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109 #ifdef SIGSTOP
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110 {"SIGSTOP", SIGSTOP},
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111 #endif
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112 #ifdef SIGTTIN
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113 {"SIGTTIN", SIGTTIN},
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114 #endif
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115 #ifdef SIGTTOU
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116 {"SIGTTOU", SIGTTOU},
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117 #endif
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118 /* some BSD signals */
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119 #ifdef SIGIOT
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120 {"SIGIOT", SIGIOT},
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121 #endif
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122 #ifdef SIGBUS
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123 {"SIGBUS", SIGBUS},
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124 #endif
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125 #ifdef SIGCLD
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126 {"SIGCLD", SIGCLD},
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127 #endif
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128 #ifdef SIGURG
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129 {"SIGURG", SIGURG},
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130 #endif
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131 #ifdef SIGXCPU
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132 {"SIGXCPU", SIGXCPU},
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133 #endif
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134 #ifdef SIGXFSZ
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135 {"SIGXFSZ", SIGXFSZ},
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136 #endif
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137 #ifdef SIGVTALRM
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138 {"SIGVTALRM", SIGVTALRM},
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139 #endif
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140 #ifdef SIGPROF
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141 {"SIGPROF", SIGPROF},
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142 #endif
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143 #ifdef SIGWINCH
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144 {"SIGWINCH", SIGWINCH},
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145 #endif
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146 #ifdef SIGPOLL
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147 {"SIGPOLL", SIGPOLL},
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148 #endif
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149 #ifdef SIGIO
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150 {"SIGIO", SIGIO},
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151 #endif
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152 /* add odd signals */
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153 #ifdef SIGSTKFLT
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154 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */
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155 #endif
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156 #ifdef SIGSYS
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157 {"SIGSYS", SIGSYS},
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158 #endif
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159 {NULL, 0}
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160 };
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161
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162 static lua_State *Lsig = NULL;
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163 static lua_Hook Hsig = NULL;
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164 static int Hmask = 0;
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165 static int Hcount = 0;
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166
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167 static int signals[MAX_PENDING_SIGNALS];
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168 static int nsig = 0;
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169
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170 static void sighook(lua_State *L, lua_Debug *ar) {
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171 (void)ar;
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172 /* restore the old hook */
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173 lua_sethook(L, Hsig, Hmask, Hcount);
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174
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175 lua_pushstring(L, LUA_SIGNAL);
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176 lua_gettable(L, LUA_REGISTRYINDEX);
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177
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178 for(int i = 0; i < nsig; i++) {
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179 lua_pushinteger(L, signals[i]);
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180 lua_gettable(L, -2);
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181 lua_call(L, 0, 0);
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182 };
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183
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184 nsig = 0;
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185
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186 lua_pop(L, 1); /* pop lua_signal table */
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187
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188 }
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189
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190 static void handle(int sig) {
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191 if(nsig == 0) {
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192 /* Store the existing debug hook (if any) and its parameters */
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193 Hsig = lua_gethook(Lsig);
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194 Hmask = lua_gethookmask(Lsig);
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195 Hcount = lua_gethookcount(Lsig);
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196
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197 /* Set our new debug hook */
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198 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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199 }
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200
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201 if(nsig < MAX_PENDING_SIGNALS) {
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202 signals[nsig++] = sig;
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203 }
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204 }
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205
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206 /*
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207 * l_signal == signal(signal [, func [, chook]])
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208 *
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209 * signal = signal number or string
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210 * func = Lua function to call
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211 * chook = catch within C functions
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212 * if caught, Lua function _must_
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213 * exit, as the stack is most likely
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214 * in an unstable state.
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215 */
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216
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217 static int l_signal(lua_State *L) {
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218 int args = lua_gettop(L);
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219 int t, sig; /* type, signal */
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220
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221 /* get type of signal */
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222 luaL_checkany(L, 1);
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223 t = lua_type(L, 1);
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224
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225 if(t == LUA_TNUMBER) {
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226 sig = (int) lua_tointeger(L, 1);
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227 } else if(t == LUA_TSTRING) {
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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_pushvalue(L, 1);
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231 lua_gettable(L, -2);
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232
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233 if(!lua_isinteger(L, -1)) {
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234 return luaL_error(L, "invalid signal string");
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235 }
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236
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237 sig = (int) lua_tointeger(L, -1);
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238 lua_pop(L, 1); /* get rid of number we pushed */
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239 } else {
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240 luaL_checknumber(L, 1); /* will always error, with good error msg */
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241 return luaL_error(L, "unreachable: invalid number was accepted");
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242 }
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243
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244 /* set handler */
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245 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */
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246 lua_pushstring(L, LUA_SIGNAL);
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247 lua_gettable(L, LUA_REGISTRYINDEX);
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248 lua_pushinteger(L, sig);
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249 lua_gettable(L, -2); /* return old handler */
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250 lua_pushinteger(L, sig);
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251 lua_pushnil(L);
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252 lua_settable(L, -4);
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253 lua_remove(L, -2); /* remove LUA_SIGNAL table */
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254 signal(sig, SIG_DFL);
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255 } else {
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256 luaL_checktype(L, 2, LUA_TFUNCTION);
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257
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258 lua_pushstring(L, LUA_SIGNAL);
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259 lua_gettable(L, LUA_REGISTRYINDEX);
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260
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261 lua_pushinteger(L, sig);
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262 lua_pushvalue(L, 2);
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263 lua_settable(L, -3);
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264
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265 /* Set the state for the handler */
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266 Lsig = L;
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267
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268 if(lua_toboolean(L, 3)) { /* c hook? */
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269 if(signal(sig, handle) == SIG_ERR) {
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270 lua_pushboolean(L, 0);
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271 } else {
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272 lua_pushboolean(L, 1);
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273 }
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274 } else { /* lua_hook */
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275 if(signal(sig, handle) == SIG_ERR) {
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276 lua_pushboolean(L, 0);
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277 } else {
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278 lua_pushboolean(L, 1);
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279 }
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280 }
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281 }
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282
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283 return 1;
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284 }
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285
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286 /*
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287 * l_raise == raise(signal)
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288 *
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289 * signal = signal number or string
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290 */
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291
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292 static int l_raise(lua_State *L) {
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293 /* int args = lua_gettop(L); */
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294 int t = 0; /* type */
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295 lua_Integer ret;
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296
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297 luaL_checkany(L, 1);
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298
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299 t = lua_type(L, 1);
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300
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301 if(t == LUA_TNUMBER) {
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302 ret = (lua_Integer) raise((int) lua_tointeger(L, 1));
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303 lua_pushinteger(L, ret);
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304 } else if(t == LUA_TSTRING) {
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305 lua_pushstring(L, LUA_SIGNAL);
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306 lua_gettable(L, LUA_REGISTRYINDEX);
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307 lua_pushvalue(L, 1);
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308 lua_gettable(L, -2);
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309
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310 if(!lua_isnumber(L, -1)) {
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311 return luaL_error(L, "invalid signal string");
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312 }
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313
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314 ret = (lua_Integer) raise((int) lua_tointeger(L, -1));
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315 lua_pop(L, 1); /* get rid of number we pushed */
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316 lua_pushinteger(L, ret);
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317 } else {
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318 luaL_checknumber(L, 1); /* will always error, with good error msg */
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319 }
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320
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321 return 1;
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322 }
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323
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324 #if defined(__unix__) || defined(__APPLE__)
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325
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326 /* define some posix only functions */
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327
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328 /*
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329 * l_kill == kill(pid, signal)
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330 *
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331 * pid = process id
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332 * signal = signal number or string
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333 */
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334
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335 static int l_kill(lua_State *L) {
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336 int t; /* type */
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337 lua_Integer ret; /* return value */
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338
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339 luaL_checknumber(L, 1); /* must be int for pid */
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340 luaL_checkany(L, 2); /* check for a second arg */
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341
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342 t = lua_type(L, 2);
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343
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344 if(t == LUA_TNUMBER) {
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345 ret = (lua_Integer) kill((int) lua_tointeger(L, 1),
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346 (int) lua_tointeger(L, 2));
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347 lua_pushinteger(L, ret);
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348 } else if(t == LUA_TSTRING) {
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349 lua_pushstring(L, LUA_SIGNAL);
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350 lua_gettable(L, LUA_REGISTRYINDEX);
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351 lua_pushvalue(L, 2);
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352 lua_gettable(L, -2);
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353
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354 if(!lua_isnumber(L, -1)) {
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355 return luaL_error(L, "invalid signal string");
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356 }
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357
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358 ret = (lua_Integer) kill((int) lua_tointeger(L, 1),
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359 (int) lua_tointeger(L, -1));
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360 lua_pop(L, 1); /* get rid of number we pushed */
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361 lua_pushinteger(L, ret);
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362 } else {
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363 luaL_checknumber(L, 2); /* will always error, with good error msg */
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364 }
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365
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366 return 1;
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367 }
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368
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369 #endif
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370
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371 static const struct luaL_Reg lsignal_lib[] = {
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372 {"signal", l_signal},
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373 {"raise", l_raise},
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374 #if defined(__unix__) || defined(__APPLE__)
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375 {"kill", l_kill},
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376 #endif
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377 {NULL, NULL}
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378 };
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379
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380 int luaopen_prosody_util_signal(lua_State *L) {
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381 luaL_checkversion(L);
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382 int i = 0;
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383
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384 /* add the library */
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385 lua_newtable(L);
6789
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386 luaL_setfuncs(L, lsignal_lib, 0);
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387
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388 /* push lua_signals table into the registry */
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389 /* put the signals inside the library table too,
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390 * they are only a reference */
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391 lua_pushstring(L, LUA_SIGNAL);
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392 lua_newtable(L);
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393
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394 while(lua_signals[i].name != NULL) {
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395 /* registry table */
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396 lua_pushstring(L, lua_signals[i].name);
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397 lua_pushinteger(L, lua_signals[i].sig);
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398 lua_settable(L, -3);
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399 /* signal table */
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400 lua_pushstring(L, lua_signals[i].name);
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401 lua_pushinteger(L, lua_signals[i].sig);
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402 lua_settable(L, -5);
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403 i++;
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404 }
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405
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406 /* add newtable to the registry */
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407 lua_settable(L, LUA_REGISTRYINDEX);
988
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408
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409 return 1;
988
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410 }
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411 int luaopen_util_signal(lua_State *L) {
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412 return luaopen_prosody_util_signal(L);
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413 }