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util-src/signal.c @ 7047:9ca2b720ad43
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| author | Matthew Wild <mwild1@gmail.com> |
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| date | Mon, 04 Jan 2016 09:14:30 +0000 |
| parent | 6789:6b180e77c97a |
| child | 7818:54669df178c2 |
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1 /* |
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2 * signal.c -- Signal Handler Library for Lua |
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3 * |
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4 * Version: 1.000+changes |
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5 * |
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6 * Copyright (C) 2007 Patrick J. Donnelly (batrick@batbytes.com) |
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7 * |
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8 * This software is distributed under the same license as Lua 5.0: |
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9 * |
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10 * Permission is hereby granted, free of charge, to any person obtaining a |
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11 * copy of this software and associated documentation files (the "Software"), |
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12 * to deal in the Software without restriction, including without limitation |
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13 * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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14 * and/or sell copies of the Software, and to permit persons to whom the |
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15 * Software is furnished to do so, subject to the following conditions: |
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16 * |
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17 * The above copyright notice and this permission notice shall be included |
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18 * in all copies or substantial portions of the Software. |
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19 * |
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20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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26 * OTHER DEALINGS IN THE SOFTWARE. |
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27 */ |
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28 |
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29 #include <signal.h> |
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30 #include <stdlib.h> |
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31 |
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32 #include "lua.h" |
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33 #include "lauxlib.h" |
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34 |
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35 #if (LUA_VERSION_NUM == 501) |
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36 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R) |
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37 #endif |
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38 |
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39 #ifndef lsig |
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40 |
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41 #define lsig |
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42 |
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43 struct lua_signal { |
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44 char* name; /* name of the signal */ |
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45 int sig; /* the signal */ |
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46 }; |
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47 |
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48 #endif |
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49 |
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50 #define LUA_SIGNAL "lua_signal" |
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51 |
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52 static const struct lua_signal lua_signals[] = { |
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53 /* ANSI C signals */ |
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54 #ifdef SIGABRT |
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55 {"SIGABRT", SIGABRT}, |
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56 #endif |
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57 #ifdef SIGFPE |
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58 {"SIGFPE", SIGFPE}, |
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59 #endif |
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60 #ifdef SIGILL |
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61 {"SIGILL", SIGILL}, |
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62 #endif |
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63 #ifdef SIGINT |
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64 {"SIGINT", SIGINT}, |
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65 #endif |
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66 #ifdef SIGSEGV |
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67 {"SIGSEGV", SIGSEGV}, |
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68 #endif |
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69 #ifdef SIGTERM |
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70 {"SIGTERM", SIGTERM}, |
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71 #endif |
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72 /* posix signals */ |
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73 #ifdef SIGHUP |
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74 {"SIGHUP", SIGHUP}, |
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75 #endif |
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76 #ifdef SIGQUIT |
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77 {"SIGQUIT", SIGQUIT}, |
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78 #endif |
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79 #ifdef SIGTRAP |
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80 {"SIGTRAP", SIGTRAP}, |
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81 #endif |
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82 #ifdef SIGKILL |
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83 {"SIGKILL", SIGKILL}, |
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84 #endif |
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85 #ifdef SIGUSR1 |
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86 {"SIGUSR1", SIGUSR1}, |
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87 #endif |
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88 #ifdef SIGUSR2 |
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89 {"SIGUSR2", SIGUSR2}, |
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90 #endif |
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91 #ifdef SIGPIPE |
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92 {"SIGPIPE", SIGPIPE}, |
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93 #endif |
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94 #ifdef SIGALRM |
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95 {"SIGALRM", SIGALRM}, |
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96 #endif |
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97 #ifdef SIGCHLD |
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98 {"SIGCHLD", SIGCHLD}, |
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99 #endif |
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100 #ifdef SIGCONT |
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101 {"SIGCONT", SIGCONT}, |
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102 #endif |
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103 #ifdef SIGSTOP |
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104 {"SIGSTOP", SIGSTOP}, |
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105 #endif |
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106 #ifdef SIGTTIN |
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107 {"SIGTTIN", SIGTTIN}, |
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108 #endif |
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109 #ifdef SIGTTOU |
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110 {"SIGTTOU", SIGTTOU}, |
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111 #endif |
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112 /* some BSD signals */ |
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113 #ifdef SIGIOT |
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114 {"SIGIOT", SIGIOT}, |
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115 #endif |
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116 #ifdef SIGBUS |
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117 {"SIGBUS", SIGBUS}, |
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118 #endif |
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119 #ifdef SIGCLD |
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120 {"SIGCLD", SIGCLD}, |
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121 #endif |
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122 #ifdef SIGURG |
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123 {"SIGURG", SIGURG}, |
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124 #endif |
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125 #ifdef SIGXCPU |
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126 {"SIGXCPU", SIGXCPU}, |
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127 #endif |
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128 #ifdef SIGXFSZ |
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129 {"SIGXFSZ", SIGXFSZ}, |
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130 #endif |
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131 #ifdef SIGVTALRM |
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132 {"SIGVTALRM", SIGVTALRM}, |
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133 #endif |
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134 #ifdef SIGPROF |
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135 {"SIGPROF", SIGPROF}, |
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136 #endif |
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137 #ifdef SIGWINCH |
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138 {"SIGWINCH", SIGWINCH}, |
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139 #endif |
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140 #ifdef SIGPOLL |
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141 {"SIGPOLL", SIGPOLL}, |
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142 #endif |
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143 #ifdef SIGIO |
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144 {"SIGIO", SIGIO}, |
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145 #endif |
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146 /* add odd signals */ |
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147 #ifdef SIGSTKFLT |
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148 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */ |
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149 #endif |
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150 #ifdef SIGSYS |
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151 {"SIGSYS", SIGSYS}, |
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152 #endif |
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153 {NULL, 0} |
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154 }; |
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155 |
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156 static lua_State* Lsig = NULL; |
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157 static lua_Hook Hsig = NULL; |
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158 static int Hmask = 0; |
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159 static int Hcount = 0; |
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160 |
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161 static struct signal_event { |
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162 int Nsig; |
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163 struct signal_event* next_event; |
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164 }* signal_queue = NULL; |
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165 |
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166 static struct signal_event* last_event = NULL; |
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167 |
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168 static void sighook(lua_State* L, lua_Debug* ar) { |
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169 struct signal_event* event; |
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170 /* restore the old hook */ |
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171 lua_sethook(L, Hsig, Hmask, Hcount); |
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172 |
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173 lua_pushstring(L, LUA_SIGNAL); |
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174 lua_gettable(L, LUA_REGISTRYINDEX); |
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175 |
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176 while((event = signal_queue)) { |
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177 lua_pushnumber(L, event->Nsig); |
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178 lua_gettable(L, -2); |
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179 lua_call(L, 0, 0); |
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180 signal_queue = event->next_event; |
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181 free(event); |
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182 }; |
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183 |
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184 lua_pop(L, 1); /* pop lua_signal table */ |
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185 |
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186 } |
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187 |
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188 static void handle(int sig) { |
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189 if(!signal_queue) { |
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190 /* Store the existing debug hook (if any) and its parameters */ |
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191 Hsig = lua_gethook(Lsig); |
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192 Hmask = lua_gethookmask(Lsig); |
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193 Hcount = lua_gethookcount(Lsig); |
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194 |
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195 signal_queue = malloc(sizeof(struct signal_event)); |
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196 signal_queue->Nsig = sig; |
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197 signal_queue->next_event = NULL; |
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198 |
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199 last_event = signal_queue; |
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200 |
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201 /* Set our new debug hook */ |
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202 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1); |
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203 } else { |
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204 last_event->next_event = malloc(sizeof(struct signal_event)); |
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205 last_event->next_event->Nsig = sig; |
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206 last_event->next_event->next_event = NULL; |
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207 |
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208 last_event = last_event->next_event; |
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209 } |
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210 } |
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211 |
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212 /* |
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213 * l_signal == signal(signal [, func [, chook]]) |
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214 * |
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215 * signal = signal number or string |
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216 * func = Lua function to call |
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217 * chook = catch within C functions |
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218 * if caught, Lua function _must_ |
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219 * exit, as the stack is most likely |
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220 * in an unstable state. |
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221 */ |
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222 |
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223 static int l_signal(lua_State* L) { |
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224 int args = lua_gettop(L); |
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225 int t, sig; /* type, signal */ |
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226 |
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227 /* get type of signal */ |
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228 luaL_checkany(L, 1); |
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229 t = lua_type(L, 1); |
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230 |
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231 if(t == LUA_TNUMBER) { |
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232 sig = (int) lua_tonumber(L, 1); |
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233 } else if(t == LUA_TSTRING) { |
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234 lua_pushstring(L, LUA_SIGNAL); |
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235 lua_gettable(L, LUA_REGISTRYINDEX); |
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236 lua_pushvalue(L, 1); |
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237 lua_gettable(L, -2); |
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238 |
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239 if(!lua_isnumber(L, -1)) { |
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240 return luaL_error(L, "invalid signal string"); |
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241 } |
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242 |
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243 sig = (int) lua_tonumber(L, -1); |
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244 lua_pop(L, 1); /* get rid of number we pushed */ |
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245 } else { |
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246 luaL_checknumber(L, 1); /* will always error, with good error msg */ |
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247 return luaL_error(L, "unreachable: invalid number was accepted"); |
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248 } |
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249 |
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250 /* set handler */ |
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251 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */ |
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252 lua_pushstring(L, LUA_SIGNAL); |
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253 lua_gettable(L, LUA_REGISTRYINDEX); |
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254 lua_pushnumber(L, sig); |
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255 lua_gettable(L, -2); /* return old handler */ |
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256 lua_pushnumber(L, sig); |
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257 lua_pushnil(L); |
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258 lua_settable(L, -4); |
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259 lua_remove(L, -2); /* remove LUA_SIGNAL table */ |
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260 signal(sig, SIG_DFL); |
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261 } else { |
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262 luaL_checktype(L, 2, LUA_TFUNCTION); |
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263 |
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264 lua_pushstring(L, LUA_SIGNAL); |
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265 lua_gettable(L, LUA_REGISTRYINDEX); |
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266 |
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267 lua_pushnumber(L, sig); |
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268 lua_pushvalue(L, 2); |
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269 lua_settable(L, -3); |
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270 |
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271 /* Set the state for the handler */ |
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272 Lsig = L; |
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273 |
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274 if(lua_toboolean(L, 3)) { /* c hook? */ |
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275 if(signal(sig, handle) == SIG_ERR) { |
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276 lua_pushboolean(L, 0); |
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277 } else { |
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278 lua_pushboolean(L, 1); |
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279 } |
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280 } else { /* lua_hook */ |
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281 if(signal(sig, handle) == SIG_ERR) { |
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282 lua_pushboolean(L, 0); |
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283 } else { |
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284 lua_pushboolean(L, 1); |
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285 } |
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286 } |
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287 } |
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288 |
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289 return 1; |
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290 } |
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291 |
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292 /* |
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293 * l_raise == raise(signal) |
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294 * |
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295 * signal = signal number or string |
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296 */ |
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297 |
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298 static int l_raise(lua_State* L) { |
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299 /* int args = lua_gettop(L); */ |
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300 int t = 0; /* type */ |
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301 lua_Number ret; |
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302 |
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303 luaL_checkany(L, 1); |
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304 |
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305 t = lua_type(L, 1); |
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306 |
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307 if(t == LUA_TNUMBER) { |
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308 ret = (lua_Number) raise((int) lua_tonumber(L, 1)); |
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309 lua_pushnumber(L, ret); |
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310 } else if(t == LUA_TSTRING) { |
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311 lua_pushstring(L, LUA_SIGNAL); |
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312 lua_gettable(L, LUA_REGISTRYINDEX); |
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313 lua_pushvalue(L, 1); |
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314 lua_gettable(L, -2); |
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315 |
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316 if(!lua_isnumber(L, -1)) { |
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317 return luaL_error(L, "invalid signal string"); |
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318 } |
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319 |
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320 ret = (lua_Number) raise((int) lua_tonumber(L, -1)); |
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321 lua_pop(L, 1); /* get rid of number we pushed */ |
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322 lua_pushnumber(L, ret); |
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323 } else { |
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324 luaL_checknumber(L, 1); /* will always error, with good error msg */ |
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325 } |
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326 |
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327 return 1; |
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328 } |
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329 |
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330 #if defined(__unix__) || defined(__APPLE__) |
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331 |
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332 /* define some posix only functions */ |
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333 |
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334 /* |
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335 * l_kill == kill(pid, signal) |
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336 * |
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337 * pid = process id |
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338 * signal = signal number or string |
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339 */ |
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340 |
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341 static int l_kill(lua_State* L) { |
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342 int t; /* type */ |
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343 lua_Number ret; /* return value */ |
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344 |
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345 luaL_checknumber(L, 1); /* must be int for pid */ |
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346 luaL_checkany(L, 2); /* check for a second arg */ |
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347 |
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348 t = lua_type(L, 2); |
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349 |
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350 if(t == LUA_TNUMBER) { |
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351 ret = (lua_Number) kill((int) lua_tonumber(L, 1), |
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352 (int) lua_tonumber(L, 2)); |
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353 lua_pushnumber(L, ret); |
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354 } else if(t == LUA_TSTRING) { |
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355 lua_pushstring(L, LUA_SIGNAL); |
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356 lua_gettable(L, LUA_REGISTRYINDEX); |
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357 lua_pushvalue(L, 2); |
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358 lua_gettable(L, -2); |
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359 |
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360 if(!lua_isnumber(L, -1)) { |
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361 return luaL_error(L, "invalid signal string"); |
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362 } |
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363 |
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364 ret = (lua_Number) kill((int) lua_tonumber(L, 1), |
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365 (int) lua_tonumber(L, -1)); |
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366 lua_pop(L, 1); /* get rid of number we pushed */ |
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367 lua_pushnumber(L, ret); |
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368 } else { |
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369 luaL_checknumber(L, 2); /* will always error, with good error msg */ |
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370 } |
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371 |
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372 return 1; |
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373 } |
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374 |
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375 #endif |
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376 |
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377 static const struct luaL_Reg lsignal_lib[] = { |
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378 {"signal", l_signal}, |
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379 {"raise", l_raise}, |
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380 #if defined(__unix__) || defined(__APPLE__) |
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381 {"kill", l_kill}, |
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382 #endif |
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383 {NULL, NULL} |
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384 }; |
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385 |
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386 int luaopen_util_signal(lua_State* L) { |
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387 int i = 0; |
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388 |
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389 /* add the library */ |
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390 lua_newtable(L); |
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391 luaL_setfuncs(L, lsignal_lib, 0); |
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392 |
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393 /* push lua_signals table into the registry */ |
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394 /* put the signals inside the library table too, |
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395 * they are only a reference */ |
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396 lua_pushstring(L, LUA_SIGNAL); |
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397 lua_newtable(L); |
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398 |
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399 while(lua_signals[i].name != NULL) { |
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400 /* registry 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, -3); |
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404 /* signal table */ |
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405 lua_pushstring(L, lua_signals[i].name); |
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406 lua_pushnumber(L, lua_signals[i].sig); |
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407 lua_settable(L, -5); |
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408 i++; |
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409 } |
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410 |
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411 /* add newtable to the registry */ |
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412 lua_settable(L, LUA_REGISTRYINDEX); |
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413 |
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414 return 1; |
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415 } |
