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util-src/signal.c @ 9656:3da6cc927ee6
util.format: Tweak how nil values are handled
Because [<nil>] seems exsessive
| author | Kim Alvefur <zash@zash.se> |
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| date | Wed, 28 Nov 2018 20:36:53 +0100 |
| parent | 9151:fee3933ff346 |
| child | 10480:94cacf9fd0ae |
| rev | line source |
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1 /* |
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2 * signal.c -- Signal Handler Library for Lua |
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3 * |
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4 * Version: 1.000+changes |
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5 * |
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6 * Copyright (C) 2007 Patrick J. Donnelly (batrick@batbytes.com) |
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7 * |
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8 * This software is distributed under the same license as Lua 5.0: |
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9 * |
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10 * Permission is hereby granted, free of charge, to any person obtaining a |
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11 * copy of this software and associated documentation files (the "Software"), |
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12 * to deal in the Software without restriction, including without limitation |
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13 * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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14 * and/or sell copies of the Software, and to permit persons to whom the |
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15 * Software is furnished to do so, subject to the following conditions: |
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16 * |
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17 * The above copyright notice and this permission notice shall be included |
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18 * in all copies or substantial portions of the Software. |
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19 * |
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20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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26 * OTHER DEALINGS IN THE SOFTWARE. |
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27 */ |
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28 |
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29 #ifndef _GNU_SOURCE |
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30 #define _GNU_SOURCE |
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31 #endif |
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32 |
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33 #include <signal.h> |
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34 #include <stdlib.h> |
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35 |
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36 #include "lua.h" |
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37 #include "lauxlib.h" |
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38 |
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39 #if (LUA_VERSION_NUM == 501) |
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40 #define luaL_setfuncs(L, R, N) luaL_register(L, NULL, R) |
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41 #endif |
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42 |
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43 #ifndef lsig |
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44 |
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45 #define lsig |
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46 |
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47 struct lua_signal { |
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48 char *name; /* name of the signal */ |
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49 int sig; /* the signal */ |
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50 }; |
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51 |
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52 #endif |
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53 |
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54 #define MAX_PENDING_SIGNALS 32 |
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55 |
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56 #define LUA_SIGNAL "lua_signal" |
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57 |
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58 static const struct lua_signal lua_signals[] = { |
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59 /* ANSI C signals */ |
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60 #ifdef SIGABRT |
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61 {"SIGABRT", SIGABRT}, |
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62 #endif |
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63 #ifdef SIGFPE |
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64 {"SIGFPE", SIGFPE}, |
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65 #endif |
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66 #ifdef SIGILL |
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67 {"SIGILL", SIGILL}, |
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68 #endif |
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69 #ifdef SIGINT |
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70 {"SIGINT", SIGINT}, |
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71 #endif |
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72 #ifdef SIGSEGV |
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73 {"SIGSEGV", SIGSEGV}, |
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74 #endif |
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75 #ifdef SIGTERM |
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76 {"SIGTERM", SIGTERM}, |
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77 #endif |
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78 /* posix signals */ |
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79 #ifdef SIGHUP |
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80 {"SIGHUP", SIGHUP}, |
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81 #endif |
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82 #ifdef SIGQUIT |
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83 {"SIGQUIT", SIGQUIT}, |
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84 #endif |
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85 #ifdef SIGTRAP |
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86 {"SIGTRAP", SIGTRAP}, |
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87 #endif |
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88 #ifdef SIGKILL |
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89 {"SIGKILL", SIGKILL}, |
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90 #endif |
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91 #ifdef SIGUSR1 |
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92 {"SIGUSR1", SIGUSR1}, |
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93 #endif |
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94 #ifdef SIGUSR2 |
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95 {"SIGUSR2", SIGUSR2}, |
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96 #endif |
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97 #ifdef SIGPIPE |
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98 {"SIGPIPE", SIGPIPE}, |
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99 #endif |
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100 #ifdef SIGALRM |
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101 {"SIGALRM", SIGALRM}, |
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102 #endif |
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103 #ifdef SIGCHLD |
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104 {"SIGCHLD", SIGCHLD}, |
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105 #endif |
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106 #ifdef SIGCONT |
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107 {"SIGCONT", SIGCONT}, |
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108 #endif |
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109 #ifdef SIGSTOP |
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110 {"SIGSTOP", SIGSTOP}, |
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111 #endif |
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112 #ifdef SIGTTIN |
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113 {"SIGTTIN", SIGTTIN}, |
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114 #endif |
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115 #ifdef SIGTTOU |
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116 {"SIGTTOU", SIGTTOU}, |
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117 #endif |
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118 /* some BSD signals */ |
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119 #ifdef SIGIOT |
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120 {"SIGIOT", SIGIOT}, |
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121 #endif |
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122 #ifdef SIGBUS |
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123 {"SIGBUS", SIGBUS}, |
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124 #endif |
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125 #ifdef SIGCLD |
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126 {"SIGCLD", SIGCLD}, |
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127 #endif |
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128 #ifdef SIGURG |
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129 {"SIGURG", SIGURG}, |
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130 #endif |
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131 #ifdef SIGXCPU |
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132 {"SIGXCPU", SIGXCPU}, |
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133 #endif |
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134 #ifdef SIGXFSZ |
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135 {"SIGXFSZ", SIGXFSZ}, |
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136 #endif |
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137 #ifdef SIGVTALRM |
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138 {"SIGVTALRM", SIGVTALRM}, |
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139 #endif |
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140 #ifdef SIGPROF |
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141 {"SIGPROF", SIGPROF}, |
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142 #endif |
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143 #ifdef SIGWINCH |
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144 {"SIGWINCH", SIGWINCH}, |
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145 #endif |
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146 #ifdef SIGPOLL |
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147 {"SIGPOLL", SIGPOLL}, |
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148 #endif |
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149 #ifdef SIGIO |
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150 {"SIGIO", SIGIO}, |
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151 #endif |
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152 /* add odd signals */ |
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153 #ifdef SIGSTKFLT |
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154 {"SIGSTKFLT", SIGSTKFLT}, /* stack fault */ |
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155 #endif |
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156 #ifdef SIGSYS |
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157 {"SIGSYS", SIGSYS}, |
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158 #endif |
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159 {NULL, 0} |
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160 }; |
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161 |
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162 static lua_State *Lsig = NULL; |
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163 static lua_Hook Hsig = NULL; |
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164 static int Hmask = 0; |
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165 static int Hcount = 0; |
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166 |
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167 int signals[MAX_PENDING_SIGNALS]; |
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168 int nsig = 0; |
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169 |
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170 static void sighook(lua_State *L, lua_Debug *ar) { |
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171 (void)ar; |
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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 for(int i = 0; i < nsig; i++) { |
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179 lua_pushnumber(L, signals[i]); |
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180 lua_gettable(L, -2); |
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181 lua_call(L, 0, 0); |
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182 }; |
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183 |
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184 nsig = 0; |
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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(nsig == 0) { |
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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 /* Set our new debug hook */ |
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198 lua_sethook(Lsig, sighook, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1); |
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199 } |
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200 |
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201 if(nsig < MAX_PENDING_SIGNALS) { |
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202 signals[nsig++] = sig; |
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203 } |
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204 } |
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205 |
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206 /* |
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207 * l_signal == signal(signal [, func [, chook]]) |
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208 * |
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209 * signal = signal number or string |
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210 * func = Lua function to call |
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211 * chook = catch within C functions |
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212 * if caught, Lua function _must_ |
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213 * exit, as the stack is most likely |
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214 * in an unstable state. |
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215 */ |
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216 |
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217 static int l_signal(lua_State *L) { |
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218 int args = lua_gettop(L); |
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219 int t, sig; /* type, signal */ |
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220 |
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221 /* get type of signal */ |
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222 luaL_checkany(L, 1); |
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223 t = lua_type(L, 1); |
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224 |
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225 if(t == LUA_TNUMBER) { |
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226 sig = (int) lua_tonumber(L, 1); |
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227 } else if(t == LUA_TSTRING) { |
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228 lua_pushstring(L, LUA_SIGNAL); |
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229 lua_gettable(L, LUA_REGISTRYINDEX); |
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230 lua_pushvalue(L, 1); |
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231 lua_gettable(L, -2); |
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232 |
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233 if(!lua_isnumber(L, -1)) { |
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234 return luaL_error(L, "invalid signal string"); |
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235 } |
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236 |
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237 sig = (int) lua_tonumber(L, -1); |
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238 lua_pop(L, 1); /* get rid of number we pushed */ |
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239 } else { |
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240 luaL_checknumber(L, 1); /* will always error, with good error msg */ |
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241 return luaL_error(L, "unreachable: invalid number was accepted"); |
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242 } |
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243 |
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244 /* set handler */ |
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245 if(args == 1 || lua_isnil(L, 2)) { /* clear handler */ |
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246 lua_pushstring(L, LUA_SIGNAL); |
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247 lua_gettable(L, LUA_REGISTRYINDEX); |
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248 lua_pushnumber(L, sig); |
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249 lua_gettable(L, -2); /* return old handler */ |
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250 lua_pushnumber(L, sig); |
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251 lua_pushnil(L); |
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252 lua_settable(L, -4); |
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253 lua_remove(L, -2); /* remove LUA_SIGNAL table */ |
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254 signal(sig, SIG_DFL); |
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255 } else { |
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256 luaL_checktype(L, 2, LUA_TFUNCTION); |
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257 |
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258 lua_pushstring(L, LUA_SIGNAL); |
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259 lua_gettable(L, LUA_REGISTRYINDEX); |
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260 |
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261 lua_pushnumber(L, sig); |
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262 lua_pushvalue(L, 2); |
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263 lua_settable(L, -3); |
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264 |
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265 /* Set the state for the handler */ |
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266 Lsig = L; |
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267 |
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268 if(lua_toboolean(L, 3)) { /* c hook? */ |
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269 if(signal(sig, handle) == SIG_ERR) { |
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270 lua_pushboolean(L, 0); |
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271 } else { |
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272 lua_pushboolean(L, 1); |
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273 } |
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274 } else { /* lua_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 } |
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281 } |
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282 |
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283 return 1; |
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284 } |
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285 |
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286 /* |
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287 * l_raise == raise(signal) |
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288 * |
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289 * signal = signal number or string |
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290 */ |
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291 |
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292 static int l_raise(lua_State *L) { |
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293 /* int args = lua_gettop(L); */ |
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294 int t = 0; /* type */ |
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295 lua_Number ret; |
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296 |
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297 luaL_checkany(L, 1); |
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298 |
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299 t = lua_type(L, 1); |
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300 |
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301 if(t == LUA_TNUMBER) { |
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302 ret = (lua_Number) raise((int) lua_tonumber(L, 1)); |
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303 lua_pushnumber(L, ret); |
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304 } else if(t == LUA_TSTRING) { |
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305 lua_pushstring(L, LUA_SIGNAL); |
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306 lua_gettable(L, LUA_REGISTRYINDEX); |
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307 lua_pushvalue(L, 1); |
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308 lua_gettable(L, -2); |
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309 |
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310 if(!lua_isnumber(L, -1)) { |
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311 return luaL_error(L, "invalid signal string"); |
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312 } |
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313 |
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314 ret = (lua_Number) raise((int) lua_tonumber(L, -1)); |
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315 lua_pop(L, 1); /* get rid of number we pushed */ |
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316 lua_pushnumber(L, ret); |
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317 } else { |
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318 luaL_checknumber(L, 1); /* will always error, with good error msg */ |
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319 } |
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320 |
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321 return 1; |
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322 } |
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323 |
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324 #if defined(__unix__) || defined(__APPLE__) |
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325 |
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326 /* define some posix only functions */ |
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327 |
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328 /* |
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329 * l_kill == kill(pid, signal) |
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330 * |
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331 * pid = process id |
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332 * signal = signal number or string |
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333 */ |
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334 |
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335 static int l_kill(lua_State *L) { |
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336 int t; /* type */ |
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337 lua_Number ret; /* return value */ |
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338 |
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339 luaL_checknumber(L, 1); /* must be int for pid */ |
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340 luaL_checkany(L, 2); /* check for a second arg */ |
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341 |
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342 t = lua_type(L, 2); |
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343 |
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344 if(t == LUA_TNUMBER) { |
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345 ret = (lua_Number) kill((int) lua_tonumber(L, 1), |
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346 (int) lua_tonumber(L, 2)); |
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347 lua_pushnumber(L, ret); |
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348 } else if(t == LUA_TSTRING) { |
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349 lua_pushstring(L, LUA_SIGNAL); |
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350 lua_gettable(L, LUA_REGISTRYINDEX); |
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351 lua_pushvalue(L, 2); |
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352 lua_gettable(L, -2); |
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353 |
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354 if(!lua_isnumber(L, -1)) { |
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355 return luaL_error(L, "invalid signal string"); |
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356 } |
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357 |
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358 ret = (lua_Number) kill((int) lua_tonumber(L, 1), |
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359 (int) lua_tonumber(L, -1)); |
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360 lua_pop(L, 1); /* get rid of number we pushed */ |
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361 lua_pushnumber(L, ret); |
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362 } else { |
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363 luaL_checknumber(L, 2); /* will always error, with good error msg */ |
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364 } |
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365 |
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366 return 1; |
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367 } |
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368 |
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369 #endif |
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370 |
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371 static const struct luaL_Reg lsignal_lib[] = { |
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372 {"signal", l_signal}, |
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373 {"raise", l_raise}, |
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374 #if defined(__unix__) || defined(__APPLE__) |
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375 {"kill", l_kill}, |
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376 #endif |
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377 {NULL, NULL} |
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378 }; |
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379 |
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380 int luaopen_util_signal(lua_State *L) { |
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381 #if (LUA_VERSION_NUM > 501) |
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382 luaL_checkversion(L); |
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383 #endif |
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384 int i = 0; |
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385 |
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386 /* add the library */ |
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387 lua_newtable(L); |
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388 luaL_setfuncs(L, lsignal_lib, 0); |
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389 |
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390 /* push lua_signals table into the registry */ |
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391 /* put the signals inside the library table too, |
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392 * they are only a reference */ |
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393 lua_pushstring(L, LUA_SIGNAL); |
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394 lua_newtable(L); |
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395 |
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396 while(lua_signals[i].name != NULL) { |
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397 /* registry table */ |
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398 lua_pushstring(L, lua_signals[i].name); |
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399 lua_pushnumber(L, lua_signals[i].sig); |
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400 lua_settable(L, -3); |
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401 /* signal table */ |
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402 lua_pushstring(L, lua_signals[i].name); |
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403 lua_pushnumber(L, lua_signals[i].sig); |
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404 lua_settable(L, -5); |
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405 i++; |
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406 } |
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407 |
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408 /* add newtable to the registry */ |
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409 lua_settable(L, LUA_REGISTRYINDEX); |
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410 |
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411 return 1; |
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412 } |
