prosody
c1d5f52274cf
util-src/signal.c

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util-src/signal.c @ 9150:c1d5f52274cf

net, pposix, signal: Check for redefined defines, fix warnings.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 08 Aug 2018 09:27:34 +0200
parent 8420:fb27aff6d491
child 9151:fee3933ff346
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * signal.c -- Signal Handler Library for Lua
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3 *
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4 * Version: 1.000+changes
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5 *
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6 * Copyright (C) 2007 Patrick J. Donnelly (batrick@batbytes.com)
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7 *
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8 * This software is distributed under the same license as Lua 5.0:
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9 *
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10 * Permission is hereby granted, free of charge, to any person obtaining a
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11 * copy of this software and associated documentation files (the "Software"),
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12 * to deal in the Software without restriction, including without limitation
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13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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14 * and/or sell copies of the Software, and to permit persons to whom the
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15 * Software is furnished to do so, subject to the following conditions:
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16 *
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17 * The above copyright notice and this permission notice shall be included
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18 * in all copies or substantial portions of the Software.
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19 *
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20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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26 * OTHER DEALINGS IN THE SOFTWARE.
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27 */
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28
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29 #ifndef _GNU_SOURCE
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30 #define _GNU_SOURCE
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31 #endif
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32
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33 #include <signal.h>
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34 #include <stdlib.h>
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35
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36 #include "lua.h"
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37 #include "lauxlib.h"
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38
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39 #if (LUA_VERSION_NUM == 501)
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40 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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41 #endif
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42
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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 int signals[MAX_PENDING_SIGNALS];
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168 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 /* restore the old hook */
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172 lua_sethook(L, Hsig, Hmask, Hcount);
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173
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174 lua_pushstring(L, LUA_SIGNAL);
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175 lua_gettable(L, LUA_REGISTRYINDEX);
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176
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177 for(int i = 0; i < nsig; i++) {
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178 lua_pushnumber(L, signals[i]);
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179 lua_gettable(L, -2);
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180 lua_call(L, 0, 0);
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181 };
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182
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183 nsig = 0;
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184
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185 lua_pop(L, 1); /* pop lua_signal table */
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186
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187 }
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188
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189 static void handle(int sig) {
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190 if(nsig == 0) {
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191 /* Store the existing debug hook (if any) and its parameters */
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192 Hsig = lua_gethook(Lsig);
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193 Hmask = lua_gethookmask(Lsig);
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194 Hcount = lua_gethookcount(Lsig);
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195
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196 /* Set our new debug hook */
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197 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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198 }
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199
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200 if(nsig < MAX_PENDING_SIGNALS) {
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201 signals[nsig++] = sig;
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202 }
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203 }
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204
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205 /*
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206 * l_signal == signal(signal [, func [, chook]])
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207 *
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208 * signal = signal number or string
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209 * func = Lua function to call
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210 * chook = catch within C functions
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211 * if caught, Lua function _must_
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212 * exit, as the stack is most likely
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213 * in an unstable state.
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214 */
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215
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216 static int l_signal(lua_State *L) {
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217 int args = lua_gettop(L);
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218 int t, sig; /* type, signal */
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219
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220 /* get type of signal */
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221 luaL_checkany(L, 1);
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222 t = lua_type(L, 1);
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223
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224 if(t == LUA_TNUMBER) {
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225 sig = (int) lua_tonumber(L, 1);
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226 } else if(t == LUA_TSTRING) {
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227 lua_pushstring(L, LUA_SIGNAL);
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228 lua_gettable(L, LUA_REGISTRYINDEX);
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229 lua_pushvalue(L, 1);
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230 lua_gettable(L, -2);
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231
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232 if(!lua_isnumber(L, -1)) {
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233 return luaL_error(L, "invalid signal string");
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234 }
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235
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236 sig = (int) lua_tonumber(L, -1);
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237 lua_pop(L, 1); /* get rid of number we pushed */
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238 } else {
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239 luaL_checknumber(L, 1); /* will always error, with good error msg */
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240 return luaL_error(L, "unreachable: invalid number was accepted");
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241 }
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242
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243 /* set handler */
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244 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */
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245 lua_pushstring(L, LUA_SIGNAL);
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246 lua_gettable(L, LUA_REGISTRYINDEX);
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247 lua_pushnumber(L, sig);
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248 lua_gettable(L, -2); /* return old handler */
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249 lua_pushnumber(L, sig);
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250 lua_pushnil(L);
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251 lua_settable(L, -4);
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252 lua_remove(L, -2); /* remove LUA_SIGNAL table */
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253 signal(sig, SIG_DFL);
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254 } else {
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255 luaL_checktype(L, 2, LUA_TFUNCTION);
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256
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257 lua_pushstring(L, LUA_SIGNAL);
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258 lua_gettable(L, LUA_REGISTRYINDEX);
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259
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260 lua_pushnumber(L, sig);
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261 lua_pushvalue(L, 2);
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262 lua_settable(L, -3);
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263
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264 /* Set the state for the handler */
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265 Lsig = L;
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266
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267 if(lua_toboolean(L, 3)) { /* c hook? */
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268 if(signal(sig, handle) == SIG_ERR) {
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269 lua_pushboolean(L, 0);
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270 } else {
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271 lua_pushboolean(L, 1);
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272 }
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273 } else { /* lua_hook */
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274 if(signal(sig, handle) == SIG_ERR) {
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275 lua_pushboolean(L, 0);
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276 } else {
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277 lua_pushboolean(L, 1);
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278 }
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279 }
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280 }
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281
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282 return 1;
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283 }
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284
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285 /*
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286 * l_raise == raise(signal)
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287 *
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288 * signal = signal number or string
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289 */
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290
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291 static int l_raise(lua_State *L) {
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292 /* int args = lua_gettop(L); */
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293 int t = 0; /* type */
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294 lua_Number ret;
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295
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296 luaL_checkany(L, 1);
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297
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298 t = lua_type(L, 1);
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299
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300 if(t == LUA_TNUMBER) {
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301 ret = (lua_Number) raise((int) lua_tonumber(L, 1));
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302 lua_pushnumber(L, ret);
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303 } else if(t == LUA_TSTRING) {
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304 lua_pushstring(L, LUA_SIGNAL);
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305 lua_gettable(L, LUA_REGISTRYINDEX);
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306 lua_pushvalue(L, 1);
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307 lua_gettable(L, -2);
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308
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309 if(!lua_isnumber(L, -1)) {
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310 return luaL_error(L, "invalid signal string");
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311 }
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312
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313 ret = (lua_Number) raise((int) lua_tonumber(L, -1));
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314 lua_pop(L, 1); /* get rid of number we pushed */
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315 lua_pushnumber(L, ret);
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316 } else {
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317 luaL_checknumber(L, 1); /* will always error, with good error msg */
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318 }
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319
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320 return 1;
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321 }
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322
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323 #if defined(__unix__) || defined(__APPLE__)
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324
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325 /* define some posix only functions */
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326
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327 /*
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328 * l_kill == kill(pid, signal)
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329 *
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330 * pid = process id
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331 * signal = signal number or string
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332 */
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333
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334 static int l_kill(lua_State *L) {
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335 int t; /* type */
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336 lua_Number ret; /* return value */
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337
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338 luaL_checknumber(L, 1); /* must be int for pid */
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339 luaL_checkany(L, 2); /* check for a second arg */
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340
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341 t = lua_type(L, 2);
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342
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343 if(t == LUA_TNUMBER) {
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344 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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345 (int) lua_tonumber(L, 2));
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346 lua_pushnumber(L, ret);
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347 } else if(t == LUA_TSTRING) {
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348 lua_pushstring(L, LUA_SIGNAL);
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349 lua_gettable(L, LUA_REGISTRYINDEX);
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350 lua_pushvalue(L, 2);
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351 lua_gettable(L, -2);
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352
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353 if(!lua_isnumber(L, -1)) {
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354 return luaL_error(L, "invalid signal string");
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355 }
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356
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357 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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358 (int) lua_tonumber(L, -1));
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359 lua_pop(L, 1); /* get rid of number we pushed */
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360 lua_pushnumber(L, ret);
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361 } else {
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362 luaL_checknumber(L, 2); /* will always error, with good error msg */
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363 }
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364
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365 return 1;
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366 }
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367
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368 #endif
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369
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370 static const struct luaL_Reg lsignal_lib[] = {
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371 {"signal", l_signal},
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372 {"raise", l_raise},
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373 #if defined(__unix__) || defined(__APPLE__)
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374 {"kill", l_kill},
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375 #endif
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376 {NULL, NULL}
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377 };
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378
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379 int luaopen_util_signal(lua_State *L) {
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380 #if (LUA_VERSION_NUM > 501)
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381 luaL_checkversion(L);
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382 #endif
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383 int i = 0;
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384
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385 /* add the library */
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386 lua_newtable(L);
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387 luaL_setfuncs(L, lsignal_lib, 0);
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388
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389 /* push lua_signals table into the registry */
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390 /* put the signals inside the library table too,
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391 * they are only a reference */
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392 lua_pushstring(L, LUA_SIGNAL);
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393 lua_newtable(L);
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394
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395 while(lua_signals[i].name != NULL) {
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396 /* registry table */
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397 lua_pushstring(L, lua_signals[i].name);
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398 lua_pushnumber(L, lua_signals[i].sig);
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399 lua_settable(L, -3);
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400 /* signal table */
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401 lua_pushstring(L, lua_signals[i].name);
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402 lua_pushnumber(L, lua_signals[i].sig);
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403 lua_settable(L, -5);
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404 i++;
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405 }
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406
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407 /* add newtable to the registry */
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parents: 6413
diff changeset
408 lua_settable(L, LUA_REGISTRYINDEX);
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
409
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
410 return 1;
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
411 }