prosody
519dea077d20
util-src/signal.c

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util-src/signal.c @ 9091:519dea077d20

util.dataforms: Allow passing dynamically generated options as values (fixes traceback) This is awkward but there’s currently no better way to do this, short of dynamically generating the entire form each time
author Kim Alvefur <zash@zash.se>
date Fri, 03 Aug 2018 22:05:40 +0200
parent 8420:fb27aff6d491
child 9150:c1d5f52274cf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 #define _GNU_SOURCE
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30
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31 #include <signal.h>
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32 #include <stdlib.h>
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34 #include "lua.h"
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35 #include "lauxlib.h"
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36
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37 #if (LUA_VERSION_NUM == 501)
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38 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R)
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39 #endif
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40
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41 #ifndef lsig
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42
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43 #define lsig
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44
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45 struct lua_signal {
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46 char *name; /* name of the signal */
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47 int sig; /* the signal */
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48 };
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49
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50 #endif
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51
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52 #define MAX_PENDING_SIGNALS 32
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53
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54 #define LUA_SIGNAL "lua_signal"
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55
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56 static const struct lua_signal lua_signals[] = {
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57 /* ANSI C signals */
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58 #ifdef SIGABRT
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59 {"SIGABRT", SIGABRT},
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60 #endif
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61 #ifdef SIGFPE
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62 {"SIGFPE", SIGFPE},
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63 #endif
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64 #ifdef SIGILL
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65 {"SIGILL", SIGILL},
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66 #endif
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67 #ifdef SIGINT
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68 {"SIGINT", SIGINT},
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69 #endif
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70 #ifdef SIGSEGV
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71 {"SIGSEGV", SIGSEGV},
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72 #endif
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73 #ifdef SIGTERM
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74 {"SIGTERM", SIGTERM},
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75 #endif
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76 /* posix signals */
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77 #ifdef SIGHUP
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78 {"SIGHUP", SIGHUP},
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79 #endif
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80 #ifdef SIGQUIT
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81 {"SIGQUIT", SIGQUIT},
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82 #endif
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83 #ifdef SIGTRAP
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84 {"SIGTRAP", SIGTRAP},
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85 #endif
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86 #ifdef SIGKILL
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87 {"SIGKILL", SIGKILL},
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88 #endif
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89 #ifdef SIGUSR1
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90 {"SIGUSR1", SIGUSR1},
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91 #endif
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92 #ifdef SIGUSR2
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93 {"SIGUSR2", SIGUSR2},
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94 #endif
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95 #ifdef SIGPIPE
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96 {"SIGPIPE", SIGPIPE},
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97 #endif
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98 #ifdef SIGALRM
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99 {"SIGALRM", SIGALRM},
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100 #endif
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101 #ifdef SIGCHLD
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102 {"SIGCHLD", SIGCHLD},
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103 #endif
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104 #ifdef SIGCONT
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105 {"SIGCONT", SIGCONT},
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106 #endif
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107 #ifdef SIGSTOP
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108 {"SIGSTOP", SIGSTOP},
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109 #endif
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110 #ifdef SIGTTIN
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111 {"SIGTTIN", SIGTTIN},
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112 #endif
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113 #ifdef SIGTTOU
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114 {"SIGTTOU", SIGTTOU},
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115 #endif
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116 /* some BSD signals */
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117 #ifdef SIGIOT
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118 {"SIGIOT", SIGIOT},
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119 #endif
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120 #ifdef SIGBUS
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121 {"SIGBUS", SIGBUS},
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122 #endif
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123 #ifdef SIGCLD
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124 {"SIGCLD", SIGCLD},
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125 #endif
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126 #ifdef SIGURG
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127 {"SIGURG", SIGURG},
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128 #endif
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129 #ifdef SIGXCPU
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130 {"SIGXCPU", SIGXCPU},
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131 #endif
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132 #ifdef SIGXFSZ
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133 {"SIGXFSZ", SIGXFSZ},
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134 #endif
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135 #ifdef SIGVTALRM
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136 {"SIGVTALRM", SIGVTALRM},
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137 #endif
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138 #ifdef SIGPROF
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139 {"SIGPROF", SIGPROF},
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140 #endif
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141 #ifdef SIGWINCH
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142 {"SIGWINCH", SIGWINCH},
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143 #endif
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144 #ifdef SIGPOLL
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145 {"SIGPOLL", SIGPOLL},
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146 #endif
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147 #ifdef SIGIO
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148 {"SIGIO", SIGIO},
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149 #endif
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150 /* add odd signals */
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151 #ifdef SIGSTKFLT
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152 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */
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153 #endif
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154 #ifdef SIGSYS
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155 {"SIGSYS", SIGSYS},
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156 #endif
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157 {NULL, 0}
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158 };
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159
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160 static lua_State *Lsig = NULL;
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161 static lua_Hook Hsig = NULL;
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162 static int Hmask = 0;
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163 static int Hcount = 0;
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164
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165 int signals[MAX_PENDING_SIGNALS];
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166 int nsig = 0;
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167
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168 static void sighook(lua_State *L, lua_Debug *ar) {
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169 /* restore the old hook */
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170 lua_sethook(L, Hsig, Hmask, Hcount);
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171
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172 lua_pushstring(L, LUA_SIGNAL);
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173 lua_gettable(L, LUA_REGISTRYINDEX);
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174
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175 for(int i = 0; i < nsig; i++) {
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176 lua_pushnumber(L, signals[i]);
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177 lua_gettable(L, -2);
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178 lua_call(L, 0, 0);
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179 };
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180
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181 nsig = 0;
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182
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183 lua_pop(L, 1); /* pop lua_signal table */
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184
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185 }
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186
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187 static void handle(int sig) {
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188 if(nsig == 0) {
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189 /* Store the existing debug hook (if any) and its parameters */
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190 Hsig = lua_gethook(Lsig);
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191 Hmask = lua_gethookmask(Lsig);
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192 Hcount = lua_gethookcount(Lsig);
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193
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194 /* Set our new debug hook */
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195 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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196 }
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197
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198 if(nsig < MAX_PENDING_SIGNALS) {
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199 signals[nsig++] = sig;
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200 }
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201 }
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202
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203 /*
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204 * l_signal == signal(signal [, func [, chook]])
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205 *
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206 * signal = signal number or string
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207 * func = Lua function to call
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208 * chook = catch within C functions
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209 * if caught, Lua function _must_
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210 * exit, as the stack is most likely
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211 * in an unstable state.
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212 */
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213
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214 static int l_signal(lua_State *L) {
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215 int args = lua_gettop(L);
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216 int t, sig; /* type, signal */
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217
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218 /* get type of signal */
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219 luaL_checkany(L, 1);
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220 t = lua_type(L, 1);
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221
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222 if(t == LUA_TNUMBER) {
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223 sig = (int) lua_tonumber(L, 1);
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224 } else if(t == LUA_TSTRING) {
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225 lua_pushstring(L, LUA_SIGNAL);
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226 lua_gettable(L, LUA_REGISTRYINDEX);
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227 lua_pushvalue(L, 1);
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228 lua_gettable(L, -2);
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229
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230 if(!lua_isnumber(L, -1)) {
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231 return luaL_error(L, "invalid signal string");
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232 }
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233
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234 sig = (int) lua_tonumber(L, -1);
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235 lua_pop(L, 1); /* get rid of number we pushed */
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236 } else {
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237 luaL_checknumber(L, 1); /* will always error, with good error msg */
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238 return luaL_error(L, "unreachable: invalid number was accepted");
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239 }
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240
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241 /* set handler */
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242 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */
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243 lua_pushstring(L, LUA_SIGNAL);
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244 lua_gettable(L, LUA_REGISTRYINDEX);
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245 lua_pushnumber(L, sig);
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246 lua_gettable(L, -2); /* return old handler */
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247 lua_pushnumber(L, sig);
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248 lua_pushnil(L);
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249 lua_settable(L, -4);
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250 lua_remove(L, -2); /* remove LUA_SIGNAL table */
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251 signal(sig, SIG_DFL);
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252 } else {
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253 luaL_checktype(L, 2, LUA_TFUNCTION);
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254
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255 lua_pushstring(L, LUA_SIGNAL);
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256 lua_gettable(L, LUA_REGISTRYINDEX);
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257
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258 lua_pushnumber(L, sig);
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259 lua_pushvalue(L, 2);
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260 lua_settable(L, -3);
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261
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262 /* Set the state for the handler */
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263 Lsig = L;
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264
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265 if(lua_toboolean(L, 3)) { /* c hook? */
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266 if(signal(sig, handle) == SIG_ERR) {
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267 lua_pushboolean(L, 0);
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268 } else {
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269 lua_pushboolean(L, 1);
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270 }
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271 } else { /* lua_hook */
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272 if(signal(sig, handle) == SIG_ERR) {
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273 lua_pushboolean(L, 0);
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274 } else {
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275 lua_pushboolean(L, 1);
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276 }
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277 }
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278 }
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279
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280 return 1;
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281 }
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282
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283 /*
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284 * l_raise == raise(signal)
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285 *
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286 * signal = signal number or string
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287 */
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288
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289 static int l_raise(lua_State *L) {
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290 /* int args = lua_gettop(L); */
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291 int t = 0; /* type */
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292 lua_Number ret;
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293
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294 luaL_checkany(L, 1);
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295
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296 t = lua_type(L, 1);
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297
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298 if(t == LUA_TNUMBER) {
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299 ret = (lua_Number) raise((int) lua_tonumber(L, 1));
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300 lua_pushnumber(L, ret);
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301 } else if(t == LUA_TSTRING) {
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302 lua_pushstring(L, LUA_SIGNAL);
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303 lua_gettable(L, LUA_REGISTRYINDEX);
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304 lua_pushvalue(L, 1);
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305 lua_gettable(L, -2);
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306
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307 if(!lua_isnumber(L, -1)) {
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308 return luaL_error(L, "invalid signal string");
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309 }
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310
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311 ret = (lua_Number) raise((int) lua_tonumber(L, -1));
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312 lua_pop(L, 1); /* get rid of number we pushed */
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313 lua_pushnumber(L, ret);
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314 } else {
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315 luaL_checknumber(L, 1); /* will always error, with good error msg */
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316 }
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317
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318 return 1;
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319 }
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320
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321 #if defined(__unix__) || defined(__APPLE__)
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322
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323 /* define some posix only functions */
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324
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325 /*
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326 * l_kill == kill(pid, signal)
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327 *
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328 * pid = process id
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329 * signal = signal number or string
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330 */
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331
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332 static int l_kill(lua_State *L) {
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333 int t; /* type */
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334 lua_Number ret; /* return value */
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335
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336 luaL_checknumber(L, 1); /* must be int for pid */
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337 luaL_checkany(L, 2); /* check for a second arg */
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338
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339 t = lua_type(L, 2);
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340
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341 if(t == LUA_TNUMBER) {
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342 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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343 (int) lua_tonumber(L, 2));
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344 lua_pushnumber(L, ret);
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345 } else if(t == LUA_TSTRING) {
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346 lua_pushstring(L, LUA_SIGNAL);
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347 lua_gettable(L, LUA_REGISTRYINDEX);
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348 lua_pushvalue(L, 2);
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349 lua_gettable(L, -2);
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350
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351 if(!lua_isnumber(L, -1)) {
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352 return luaL_error(L, "invalid signal string");
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353 }
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354
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355 ret = (lua_Number) kill((int) lua_tonumber(L, 1),
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356 (int) lua_tonumber(L, -1));
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357 lua_pop(L, 1); /* get rid of number we pushed */
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358 lua_pushnumber(L, ret);
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359 } else {
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360 luaL_checknumber(L, 2); /* will always error, with good error msg */
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361 }
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362
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363 return 1;
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364 }
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365
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366 #endif
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367
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368 static const struct luaL_Reg lsignal_lib[] = {
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369 {"signal", l_signal},
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370 {"raise", l_raise},
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371 #if defined(__unix__) || defined(__APPLE__)
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372 {"kill", l_kill},
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373 #endif
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374 {NULL, NULL}
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375 };
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376
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377 int luaopen_util_signal(lua_State *L) {
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378 #if (LUA_VERSION_NUM > 501)
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379 luaL_checkversion(L);
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380 #endif
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381 int i = 0;
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382
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383 /* add the library */
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384 lua_newtable(L);
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385 luaL_setfuncs(L, lsignal_lib, 0);
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386
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387 /* push lua_signals table into the registry */
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388 /* put the signals inside the library table too,
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389 * they are only a reference */
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390 lua_pushstring(L, LUA_SIGNAL);
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391 lua_newtable(L);
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392
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393 while(lua_signals[i].name != NULL) {
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394 /* registry table */
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395 lua_pushstring(L, lua_signals[i].name);
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396 lua_pushnumber(L, lua_signals[i].sig);
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397 lua_settable(L, -3);
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398 /* signal table */
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399 lua_pushstring(L, lua_signals[i].name);
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400 lua_pushnumber(L, lua_signals[i].sig);
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401 lua_settable(L, -5);
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402 i++;
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403 }
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404
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405 /* add newtable to the registry */
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406 lua_settable(L, LUA_REGISTRYINDEX);
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407
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
408 return 1;
988
8cb9a0d59e78 util.lsignal: Add lsignal library for catching POSIX signals
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
409 }