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util-src/signal.c @ 8274:3798955049e3
prosodyctl: cert import: Reuse function from certmanager for locating certificates and keys
| author | Kim Alvefur <zash@zash.se> |
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| date | Wed, 27 Sep 2017 15:21:20 +0200 |
| parent | 7973:703f7f45feb4 |
| child | 8414:7ea3311ca632 |
| 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 #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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33 |
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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 LUA_SIGNAL "lua_signal" |
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53 |
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54 static const struct lua_signal lua_signals[] = { |
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55 /* ANSI C signals */ |
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56 #ifdef SIGABRT |
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57 {"SIGABRT", SIGABRT}, |
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58 #endif |
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59 #ifdef SIGFPE |
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60 {"SIGFPE", SIGFPE}, |
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61 #endif |
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62 #ifdef SIGILL |
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63 {"SIGILL", SIGILL}, |
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64 #endif |
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65 #ifdef SIGINT |
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66 {"SIGINT", SIGINT}, |
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67 #endif |
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68 #ifdef SIGSEGV |
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69 {"SIGSEGV", SIGSEGV}, |
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70 #endif |
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71 #ifdef SIGTERM |
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72 {"SIGTERM", SIGTERM}, |
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73 #endif |
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74 /* posix signals */ |
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75 #ifdef SIGHUP |
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76 {"SIGHUP", SIGHUP}, |
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77 #endif |
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78 #ifdef SIGQUIT |
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79 {"SIGQUIT", SIGQUIT}, |
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80 #endif |
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81 #ifdef SIGTRAP |
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82 {"SIGTRAP", SIGTRAP}, |
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83 #endif |
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84 #ifdef SIGKILL |
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85 {"SIGKILL", SIGKILL}, |
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86 #endif |
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87 #ifdef SIGUSR1 |
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88 {"SIGUSR1", SIGUSR1}, |
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89 #endif |
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90 #ifdef SIGUSR2 |
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91 {"SIGUSR2", SIGUSR2}, |
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92 #endif |
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93 #ifdef SIGPIPE |
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94 {"SIGPIPE", SIGPIPE}, |
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95 #endif |
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96 #ifdef SIGALRM |
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97 {"SIGALRM", SIGALRM}, |
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98 #endif |
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99 #ifdef SIGCHLD |
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100 {"SIGCHLD", SIGCHLD}, |
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101 #endif |
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102 #ifdef SIGCONT |
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103 {"SIGCONT", SIGCONT}, |
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104 #endif |
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105 #ifdef SIGSTOP |
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106 {"SIGSTOP", SIGSTOP}, |
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107 #endif |
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108 #ifdef SIGTTIN |
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109 {"SIGTTIN", SIGTTIN}, |
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110 #endif |
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111 #ifdef SIGTTOU |
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112 {"SIGTTOU", SIGTTOU}, |
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113 #endif |
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114 /* some BSD signals */ |
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115 #ifdef SIGIOT |
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116 {"SIGIOT", SIGIOT}, |
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117 #endif |
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118 #ifdef SIGBUS |
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119 {"SIGBUS", SIGBUS}, |
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120 #endif |
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121 #ifdef SIGCLD |
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122 {"SIGCLD", SIGCLD}, |
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123 #endif |
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124 #ifdef SIGURG |
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125 {"SIGURG", SIGURG}, |
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126 #endif |
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127 #ifdef SIGXCPU |
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128 {"SIGXCPU", SIGXCPU}, |
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129 #endif |
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130 #ifdef SIGXFSZ |
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131 {"SIGXFSZ", SIGXFSZ}, |
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132 #endif |
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133 #ifdef SIGVTALRM |
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134 {"SIGVTALRM", SIGVTALRM}, |
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135 #endif |
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136 #ifdef SIGPROF |
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137 {"SIGPROF", SIGPROF}, |
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138 #endif |
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139 #ifdef SIGWINCH |
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140 {"SIGWINCH", SIGWINCH}, |
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141 #endif |
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142 #ifdef SIGPOLL |
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143 {"SIGPOLL", SIGPOLL}, |
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144 #endif |
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145 #ifdef SIGIO |
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146 {"SIGIO", SIGIO}, |
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147 #endif |
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148 /* add odd signals */ |
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149 #ifdef SIGSTKFLT |
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150 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */ |
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151 #endif |
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152 #ifdef SIGSYS |
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153 {"SIGSYS", SIGSYS}, |
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154 #endif |
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155 {NULL, 0} |
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156 }; |
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157 |
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158 static lua_State *Lsig = NULL; |
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159 static lua_Hook Hsig = NULL; |
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160 static int Hmask = 0; |
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161 static int Hcount = 0; |
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162 |
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163 static struct signal_event { |
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164 int Nsig; |
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165 struct signal_event *next_event; |
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166 } *signal_queue = NULL; |
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167 |
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168 static struct signal_event *last_event = NULL; |
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169 |
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170 static void sighook(lua_State *L, lua_Debug *ar) { |
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171 struct signal_event *event; |
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172 /* restore the old hook */ |
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173 lua_sethook(L, Hsig, Hmask, Hcount); |
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174 |
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175 lua_pushstring(L, LUA_SIGNAL); |
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176 lua_gettable(L, LUA_REGISTRYINDEX); |
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177 |
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178 while((event = signal_queue)) { |
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179 lua_pushnumber(L, event->Nsig); |
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180 lua_gettable(L, -2); |
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181 lua_call(L, 0, 0); |
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182 signal_queue = event->next_event; |
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183 free(event); |
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184 }; |
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185 |
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186 lua_pop(L, 1); /* pop lua_signal table */ |
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187 |
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188 } |
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189 |
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190 static void handle(int sig) { |
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191 if(!signal_queue) { |
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192 /* Store the existing debug hook (if any) and its parameters */ |
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193 Hsig = lua_gethook(Lsig); |
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194 Hmask = lua_gethookmask(Lsig); |
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195 Hcount = lua_gethookcount(Lsig); |
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196 |
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197 signal_queue = malloc(sizeof(struct signal_event)); |
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198 signal_queue->Nsig = sig; |
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199 signal_queue->next_event = NULL; |
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200 |
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201 last_event = signal_queue; |
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202 |
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203 /* Set our new debug hook */ |
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204 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1); |
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205 } else { |
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206 last_event->next_event = malloc(sizeof(struct signal_event)); |
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207 last_event->next_event->Nsig = sig; |
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208 last_event->next_event->next_event = NULL; |
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209 |
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210 last_event = last_event->next_event; |
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211 } |
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212 } |
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213 |
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214 /* |
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215 * l_signal == signal(signal [, func [, chook]]) |
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216 * |
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217 * signal = signal number or string |
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218 * func = Lua function to call |
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219 * chook = catch within C functions |
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220 * if caught, Lua function _must_ |
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221 * exit, as the stack is most likely |
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222 * in an unstable state. |
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223 */ |
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224 |
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225 static int l_signal(lua_State *L) { |
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226 int args = lua_gettop(L); |
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227 int t, sig; /* type, signal */ |
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228 |
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229 /* get type of signal */ |
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230 luaL_checkany(L, 1); |
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231 t = lua_type(L, 1); |
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232 |
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233 if(t == LUA_TNUMBER) { |
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234 sig = (int) lua_tonumber(L, 1); |
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235 } else if(t == LUA_TSTRING) { |
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236 lua_pushstring(L, LUA_SIGNAL); |
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237 lua_gettable(L, LUA_REGISTRYINDEX); |
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238 lua_pushvalue(L, 1); |
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239 lua_gettable(L, -2); |
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240 |
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241 if(!lua_isnumber(L, -1)) { |
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242 return luaL_error(L, "invalid signal string"); |
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243 } |
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244 |
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245 sig = (int) lua_tonumber(L, -1); |
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246 lua_pop(L, 1); /* get rid of number we pushed */ |
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247 } else { |
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248 luaL_checknumber(L, 1); /* will always error, with good error msg */ |
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249 return luaL_error(L, "unreachable: invalid number was accepted"); |
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250 } |
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251 |
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252 /* set handler */ |
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253 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */ |
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254 lua_pushstring(L, LUA_SIGNAL); |
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255 lua_gettable(L, LUA_REGISTRYINDEX); |
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256 lua_pushnumber(L, sig); |
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257 lua_gettable(L, -2); /* return old handler */ |
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258 lua_pushnumber(L, sig); |
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259 lua_pushnil(L); |
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260 lua_settable(L, -4); |
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261 lua_remove(L, -2); /* remove LUA_SIGNAL table */ |
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262 signal(sig, SIG_DFL); |
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263 } else { |
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264 luaL_checktype(L, 2, LUA_TFUNCTION); |
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265 |
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266 lua_pushstring(L, LUA_SIGNAL); |
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267 lua_gettable(L, LUA_REGISTRYINDEX); |
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268 |
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269 lua_pushnumber(L, sig); |
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270 lua_pushvalue(L, 2); |
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271 lua_settable(L, -3); |
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272 |
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273 /* Set the state for the handler */ |
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274 Lsig = L; |
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275 |
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276 if(lua_toboolean(L, 3)) { /* c hook? */ |
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277 if(signal(sig, handle) == SIG_ERR) { |
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278 lua_pushboolean(L, 0); |
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279 } else { |
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280 lua_pushboolean(L, 1); |
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281 } |
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282 } else { /* lua_hook */ |
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283 if(signal(sig, handle) == SIG_ERR) { |
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284 lua_pushboolean(L, 0); |
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285 } else { |
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286 lua_pushboolean(L, 1); |
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287 } |
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288 } |
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289 } |
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290 |
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291 return 1; |
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292 } |
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293 |
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294 /* |
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295 * l_raise == raise(signal) |
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296 * |
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297 * signal = signal number or string |
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298 */ |
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299 |
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300 static int l_raise(lua_State *L) { |
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301 /* int args = lua_gettop(L); */ |
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302 int t = 0; /* type */ |
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303 lua_Number ret; |
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304 |
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305 luaL_checkany(L, 1); |
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306 |
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307 t = lua_type(L, 1); |
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308 |
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309 if(t == LUA_TNUMBER) { |
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310 ret = (lua_Number) raise((int) lua_tonumber(L, 1)); |
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311 lua_pushnumber(L, ret); |
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312 } else if(t == LUA_TSTRING) { |
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313 lua_pushstring(L, LUA_SIGNAL); |
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314 lua_gettable(L, LUA_REGISTRYINDEX); |
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315 lua_pushvalue(L, 1); |
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316 lua_gettable(L, -2); |
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317 |
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318 if(!lua_isnumber(L, -1)) { |
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319 return luaL_error(L, "invalid signal string"); |
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320 } |
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321 |
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322 ret = (lua_Number) raise((int) lua_tonumber(L, -1)); |
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323 lua_pop(L, 1); /* get rid of number we pushed */ |
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324 lua_pushnumber(L, ret); |
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325 } else { |
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326 luaL_checknumber(L, 1); /* will always error, with good error msg */ |
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327 } |
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328 |
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329 return 1; |
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330 } |
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331 |
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332 #if defined(__unix__) || defined(__APPLE__) |
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333 |
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334 /* define some posix only functions */ |
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335 |
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336 /* |
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337 * l_kill == kill(pid, signal) |
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338 * |
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339 * pid = process id |
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340 * signal = signal number or string |
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341 */ |
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342 |
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343 static int l_kill(lua_State *L) { |
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344 int t; /* type */ |
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345 lua_Number ret; /* return value */ |
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346 |
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347 luaL_checknumber(L, 1); /* must be int for pid */ |
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348 luaL_checkany(L, 2); /* check for a second arg */ |
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349 |
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350 t = lua_type(L, 2); |
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351 |
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352 if(t == LUA_TNUMBER) { |
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353 ret = (lua_Number) kill((int) lua_tonumber(L, 1), |
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354 (int) lua_tonumber(L, 2)); |
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355 lua_pushnumber(L, ret); |
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356 } else if(t == LUA_TSTRING) { |
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357 lua_pushstring(L, LUA_SIGNAL); |
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358 lua_gettable(L, LUA_REGISTRYINDEX); |
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359 lua_pushvalue(L, 2); |
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360 lua_gettable(L, -2); |
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361 |
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362 if(!lua_isnumber(L, -1)) { |
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363 return luaL_error(L, "invalid signal string"); |
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364 } |
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365 |
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366 ret = (lua_Number) kill((int) lua_tonumber(L, 1), |
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367 (int) lua_tonumber(L, -1)); |
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368 lua_pop(L, 1); /* get rid of number we pushed */ |
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369 lua_pushnumber(L, ret); |
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370 } else { |
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371 luaL_checknumber(L, 2); /* will always error, with good error msg */ |
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372 } |
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373 |
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374 return 1; |
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375 } |
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376 |
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377 #endif |
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378 |
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379 static const struct luaL_Reg lsignal_lib[] = { |
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380 {"signal", l_signal}, |
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381 {"raise", l_raise}, |
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382 #if defined(__unix__) || defined(__APPLE__) |
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383 {"kill", l_kill}, |
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384 #endif |
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385 {NULL, NULL} |
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386 }; |
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387 |
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388 int luaopen_util_signal(lua_State *L) { |
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389 #if (LUA_VERSION_NUM > 501) |
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390 luaL_checkversion(L); |
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391 #endif |
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392 int i = 0; |
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393 |
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394 /* add the library */ |
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395 lua_newtable(L); |
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396 luaL_setfuncs(L, lsignal_lib, 0); |
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397 |
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398 /* push lua_signals table into the registry */ |
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399 /* put the signals inside the library table too, |
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400 * they are only a reference */ |
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401 lua_pushstring(L, LUA_SIGNAL); |
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402 lua_newtable(L); |
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403 |
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404 while(lua_signals[i].name != NULL) { |
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405 /* registry table */ |
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406 lua_pushstring(L, lua_signals[i].name); |
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407 lua_pushnumber(L, lua_signals[i].sig); |
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408 lua_settable(L, -3); |
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409 /* signal table */ |
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410 lua_pushstring(L, lua_signals[i].name); |
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411 lua_pushnumber(L, lua_signals[i].sig); |
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412 lua_settable(L, -5); |
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413 i++; |
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414 } |
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415 |
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416 /* add newtable to the registry */ |
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417 lua_settable(L, LUA_REGISTRYINDEX); |
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418 |
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419 return 1; |
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420 } |
