prosody
2e553f80aedd
util-src/signal.c

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util-src/signal.c @ 7665:2e553f80aedd

mod_component: Fire 'component-disconnected' event on host, to maintain consistency - sessions with no host never authenticated. Fixes #737
author Matthew Wild <mwild1@gmail.com>
date Mon, 12 Sep 2016 22:30:37 +0100
parent 6789:6b180e77c97a
child 7818:54669df178c2
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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 #include <signal.h>
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30 #include <stdlib.h>
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32 #include "lua.h"
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33 #include "lauxlib.h"
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34
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35 #if (LUA_VERSION_NUM == 501)
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36 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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37 #endif
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38
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39 #ifndef lsig
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40
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41 #define lsig
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42
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43 struct lua_signal {
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44 char* name; /* name of the signal */
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45 int sig; /* the signal */
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46 };
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47
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48 #endif
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49
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50 #define LUA_SIGNAL "lua_signal"
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51
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52 static const struct lua_signal lua_signals[] = {
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53 /* ANSI C signals */
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54 #ifdef SIGABRT
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55 {"SIGABRT", SIGABRT},
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56 #endif
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57 #ifdef SIGFPE
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58 {"SIGFPE", SIGFPE},
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59 #endif
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60 #ifdef SIGILL
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61 {"SIGILL", SIGILL},
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62 #endif
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63 #ifdef SIGINT
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64 {"SIGINT", SIGINT},
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65 #endif
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66 #ifdef SIGSEGV
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67 {"SIGSEGV", SIGSEGV},
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68 #endif
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69 #ifdef SIGTERM
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70 {"SIGTERM", SIGTERM},
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71 #endif
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72 /* posix signals */
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73 #ifdef SIGHUP
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74 {"SIGHUP", SIGHUP},
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75 #endif
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76 #ifdef SIGQUIT
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77 {"SIGQUIT", SIGQUIT},
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78 #endif
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79 #ifdef SIGTRAP
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80 {"SIGTRAP", SIGTRAP},
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81 #endif
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82 #ifdef SIGKILL
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83 {"SIGKILL", SIGKILL},
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84 #endif
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85 #ifdef SIGUSR1
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86 {"SIGUSR1", SIGUSR1},
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87 #endif
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88 #ifdef SIGUSR2
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89 {"SIGUSR2", SIGUSR2},
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90 #endif
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91 #ifdef SIGPIPE
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92 {"SIGPIPE", SIGPIPE},
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93 #endif
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94 #ifdef SIGALRM
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95 {"SIGALRM", SIGALRM},
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96 #endif
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97 #ifdef SIGCHLD
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98 {"SIGCHLD", SIGCHLD},
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99 #endif
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100 #ifdef SIGCONT
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101 {"SIGCONT", SIGCONT},
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102 #endif
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103 #ifdef SIGSTOP
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104 {"SIGSTOP", SIGSTOP},
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105 #endif
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106 #ifdef SIGTTIN
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107 {"SIGTTIN", SIGTTIN},
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108 #endif
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109 #ifdef SIGTTOU
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110 {"SIGTTOU", SIGTTOU},
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111 #endif
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112 /* some BSD signals */
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113 #ifdef SIGIOT
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114 {"SIGIOT", SIGIOT},
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115 #endif
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116 #ifdef SIGBUS
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117 {"SIGBUS", SIGBUS},
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118 #endif
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119 #ifdef SIGCLD
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120 {"SIGCLD", SIGCLD},
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121 #endif
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122 #ifdef SIGURG
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123 {"SIGURG", SIGURG},
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124 #endif
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125 #ifdef SIGXCPU
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126 {"SIGXCPU", SIGXCPU},
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127 #endif
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128 #ifdef SIGXFSZ
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129 {"SIGXFSZ", SIGXFSZ},
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130 #endif
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131 #ifdef SIGVTALRM
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132 {"SIGVTALRM", SIGVTALRM},
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133 #endif
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134 #ifdef SIGPROF
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135 {"SIGPROF", SIGPROF},
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136 #endif
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137 #ifdef SIGWINCH
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138 {"SIGWINCH", SIGWINCH},
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139 #endif
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140 #ifdef SIGPOLL
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141 {"SIGPOLL", SIGPOLL},
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142 #endif
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143 #ifdef SIGIO
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144 {"SIGIO", SIGIO},
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145 #endif
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146 /* add odd signals */
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147 #ifdef SIGSTKFLT
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148 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */
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149 #endif
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150 #ifdef SIGSYS
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151 {"SIGSYS", SIGSYS},
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152 #endif
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153 {NULL, 0}
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154 };
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155
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156 static lua_State* Lsig = NULL;
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157 static lua_Hook Hsig = NULL;
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158 static int Hmask = 0;
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159 static int Hcount = 0;
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160
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161 static struct signal_event {
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162 int Nsig;
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163 struct signal_event* next_event;
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164 }* signal_queue = NULL;
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165
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166 static struct signal_event* last_event = NULL;
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167
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168 static void sighook(lua_State* L, lua_Debug* ar) {
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169 struct signal_event* event;
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170 /* restore the old hook */
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171 lua_sethook(L, Hsig, Hmask, Hcount);
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172
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173 lua_pushstring(L, LUA_SIGNAL);
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174 lua_gettable(L, LUA_REGISTRYINDEX);
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175
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176 while((event = signal_queue)) {
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177 lua_pushnumber(L, event->Nsig);
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178 lua_gettable(L, -2);
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179 lua_call(L, 0, 0);
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180 signal_queue = event->next_event;
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181 free(event);
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182 };
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183
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184 lua_pop(L, 1); /* pop lua_signal table */
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185
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186 }
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187
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188 static void handle(int sig) {
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189 if(!signal_queue) {
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190 /* Store the existing debug hook (if any) and its parameters */
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191 Hsig = lua_gethook(Lsig);
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192 Hmask = lua_gethookmask(Lsig);
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193 Hcount = lua_gethookcount(Lsig);
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194
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195 signal_queue = malloc(sizeof(struct signal_event));
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196 signal_queue->Nsig = sig;
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197 signal_queue->next_event = NULL;
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198
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199 last_event = signal_queue;
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200
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201 /* Set our new debug hook */
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202 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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203 } else {
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204 last_event->next_event = malloc(sizeof(struct signal_event));
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205 last_event->next_event->Nsig = sig;
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206 last_event->next_event->next_event = NULL;
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207
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208 last_event = last_event->next_event;
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209 }
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210 }
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211
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212 /*
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213 * l_signal == signal(signal [, func [, chook]])
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214 *
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215 * signal = signal number or string
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216 * func = Lua function to call
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217 * chook = catch within C functions
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218 * if caught, Lua function _must_
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219 * exit, as the stack is most likely
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220 * in an unstable state.
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221 */
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222
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223 static int l_signal(lua_State* L) {
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224 int args = lua_gettop(L);
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225 int t, sig; /* type, signal */
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226
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227 /* get type of signal */
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228 luaL_checkany(L, 1);
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229 t = lua_type(L, 1);
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230
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231 if(t == LUA_TNUMBER) {
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232 sig = (int) lua_tonumber(L, 1);
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233 } else if(t == LUA_TSTRING) {
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234 lua_pushstring(L, LUA_SIGNAL);
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235 lua_gettable(L, LUA_REGISTRYINDEX);
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236 lua_pushvalue(L, 1);
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237 lua_gettable(L, -2);
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238
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239 if(!lua_isnumber(L, -1)) {
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240 return luaL_error(L, "invalid signal string");
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241 }
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242
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243 sig = (int) lua_tonumber(L, -1);
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244 lua_pop(L, 1); /* get rid of number we pushed */
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245 } else {
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246 luaL_checknumber(L, 1); /* will always error, with good error msg */
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247 return luaL_error(L, "unreachable: invalid number was accepted");
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248 }
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249
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250 /* set handler */
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251 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */
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252 lua_pushstring(L, LUA_SIGNAL);
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253 lua_gettable(L, LUA_REGISTRYINDEX);
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254 lua_pushnumber(L, sig);
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255 lua_gettable(L, -2); /* return old handler */
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256 lua_pushnumber(L, sig);
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257 lua_pushnil(L);
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258 lua_settable(L, -4);
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259 lua_remove(L, -2); /* remove LUA_SIGNAL table */
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260 signal(sig, SIG_DFL);
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261 } else {
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262 luaL_checktype(L, 2, LUA_TFUNCTION);
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263
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264 lua_pushstring(L, LUA_SIGNAL);
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265 lua_gettable(L, LUA_REGISTRYINDEX);
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266
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267 lua_pushnumber(L, sig);
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268 lua_pushvalue(L, 2);
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269 lua_settable(L, -3);
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270
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271 /* Set the state for the handler */
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272 Lsig = L;
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273
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274 if(lua_toboolean(L, 3)) { /* c 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 } else { /* lua_hook */
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281 if(signal(sig, handle) == SIG_ERR) {
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282 lua_pushboolean(L, 0);
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283 } else {
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284 lua_pushboolean(L, 1);
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285 }
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286 }
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287 }
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288
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289 return 1;
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290 }
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291
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292 /*
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293 * l_raise == raise(signal)
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294 *
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295 * signal = signal number or string
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296 */
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297
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298 static int l_raise(lua_State* L) {
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299 /* int args = lua_gettop(L); */
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300 int t = 0; /* type */
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301 lua_Number ret;
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302
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303 luaL_checkany(L, 1);
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304
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305 t = lua_type(L, 1);
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306
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307 if(t == LUA_TNUMBER) {
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308 ret = (lua_Number) raise((int) lua_tonumber(L, 1));
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309 lua_pushnumber(L, ret);
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310 } else if(t == LUA_TSTRING) {
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311 lua_pushstring(L, LUA_SIGNAL);
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312 lua_gettable(L, LUA_REGISTRYINDEX);
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313 lua_pushvalue(L, 1);
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314 lua_gettable(L, -2);
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315
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316 if(!lua_isnumber(L, -1)) {
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317 return luaL_error(L, "invalid signal string");
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318 }
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319
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320 ret = (lua_Number) raise((int) lua_tonumber(L, -1));
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321 lua_pop(L, 1); /* get rid of number we pushed */
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322 lua_pushnumber(L, ret);
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323 } else {
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324 luaL_checknumber(L, 1); /* will always error, with good error msg */
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325 }
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326
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327 return 1;
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328 }
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329
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330 #if defined(__unix__) || defined(__APPLE__)
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331
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332 /* define some posix only functions */
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333
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334 /*
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335 * l_kill == kill(pid, signal)
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336 *
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337 * pid = process id
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338 * signal = signal number or string
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339 */
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340
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341 static int l_kill(lua_State* L) {
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342 int t; /* type */
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343 lua_Number ret; /* return value */
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344
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345 luaL_checknumber(L, 1); /* must be int for pid */
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346 luaL_checkany(L, 2); /* check for a second arg */
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347
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348 t = lua_type(L, 2);
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349
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350 if(t == LUA_TNUMBER) {
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351 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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352 (int) lua_tonumber(L, 2));
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353 lua_pushnumber(L, ret);
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354 } else if(t == LUA_TSTRING) {
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355 lua_pushstring(L, LUA_SIGNAL);
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356 lua_gettable(L, LUA_REGISTRYINDEX);
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357 lua_pushvalue(L, 2);
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358 lua_gettable(L, -2);
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359
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360 if(!lua_isnumber(L, -1)) {
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361 return luaL_error(L, "invalid signal string");
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362 }
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363
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364 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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365 (int) lua_tonumber(L, -1));
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366 lua_pop(L, 1); /* get rid of number we pushed */
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367 lua_pushnumber(L, ret);
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368 } else {
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369 luaL_checknumber(L, 2); /* will always error, with good error msg */
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370 }
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371
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372 return 1;
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373 }
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374
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375 #endif
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376
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377 static const struct luaL_Reg lsignal_lib[] = {
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378 {"signal", l_signal},
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379 {"raise", l_raise},
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380 #if defined(__unix__) || defined(__APPLE__)
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381 {"kill", l_kill},
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382 #endif
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383 {NULL, NULL}
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384 };
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385
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386 int luaopen_util_signal(lua_State* L) {
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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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diff changeset
399 while(lua_signals[i].name != NULL) {
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
400 /* registry table */
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
401 lua_pushstring(L, lua_signals[i].name);
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
402 lua_pushnumber(L, lua_signals[i].sig);
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
403 lua_settable(L, -3);
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
404 /* signal table */
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
405 lua_pushstring(L, lua_signals[i].name);
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
406 lua_pushnumber(L, lua_signals[i].sig);
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
407 lua_settable(L, -5);
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
408 i++;
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
409 }
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
410
6615
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
411 /* add newtable to the registry */
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
412 lua_settable(L, LUA_REGISTRYINDEX);
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
413
6615
8e4572a642cb util-src/*.c: astyle --indent=tab --brackets=attach --indent-switches --break-blocks --pad-oper --unpad-paren --add-brackets --align-pointer=type --lineend=linux
Kim Alvefur <zash@zash.se>
parents: 6413
diff changeset
414 return 1;
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
415 }