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1 // sighandlers.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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240
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #include <sys/types.h> |
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29 #ifdef HAVE_UNISTD_H |
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30 #include <unistd.h> |
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31 #endif |
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32 #include <new.h> |
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33 #include <signal.h> |
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34 |
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35 #include "sighandlers.h" |
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36 #include "octave.h" |
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37 #include "error.h" |
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38 #include "utils.h" |
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39 |
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40 // Nonzero means we have already printed a message for this series of |
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41 // SIGPIPES. We assume that the writer will eventually give up. |
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42 int pipe_handler_error_count = 0; |
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43 |
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44 // Nonzero means we can be interrupted. |
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45 int can_interrupt = 0; |
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46 |
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47 static void |
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48 my_friendly_exit (const char *sig_name, int sig_number) |
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49 { |
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50 error ("%s -- stopping myself...", sig_name); |
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51 clean_up_and_exit (sig_number); |
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52 } |
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53 |
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54 // I know, not really a signal handler. |
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55 |
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56 static void |
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57 octave_new_handler (void) |
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58 { |
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59 error ("new: virtual memory exhausted -- stopping myself"); |
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60 clean_up_and_exit (1); |
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61 } |
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62 |
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63 static RETSIGTYPE |
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64 generic_sig_handler (int i) |
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65 { |
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66 my_friendly_exit (sys_siglist[i], i); |
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67 |
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68 #if RETSIGTYPE == void |
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69 return; |
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70 #else |
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71 return 0; |
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72 #endif |
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73 } |
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74 |
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75 // Handle SIGINT by restarting the parser (see octave.cc). |
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76 |
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77 // XXX FIXME XXX -- it would probably be good to try to use POSIX |
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78 // signal interface if it is available. |
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79 |
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80 static RETSIGTYPE |
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81 sigint_handler (int i) |
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82 { |
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83 // Can this ever cause trouble on systems that don't forget signal |
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84 // handlers when they are invoked? |
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85 |
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86 signal (SIGINT, sigint_handler); |
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87 |
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88 if (can_interrupt) |
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89 { |
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90 jump_to_top_level (); |
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91 panic_impossible (); |
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92 } |
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93 |
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94 #if RETSIGTYPE == void |
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95 return; |
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96 #else |
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97 return 0; |
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98 #endif |
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99 } |
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100 |
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101 static RETSIGTYPE |
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102 sigpipe_handler (int i) |
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103 { |
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104 // Can this ever cause trouble on systems that don't forget signal |
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105 // handlers when they are invoked? |
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106 |
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107 signal (SIGPIPE, sigpipe_handler); |
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108 |
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109 if (pipe_handler_error_count++ == 0) |
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110 message (0, "broken pipe"); |
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111 |
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112 // Don\'t loop forever on account of this. |
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113 if (pipe_handler_error_count > 100) |
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114 jump_to_top_level (); |
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115 |
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116 #if RETSIGTYPE == void |
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117 return; |
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118 #else |
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119 return 0; |
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120 #endif |
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121 } |
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122 |
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123 // Install all the handlers for the signals we might care about. |
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124 |
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125 void |
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126 install_signal_handlers (void) |
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127 { |
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128 set_new_handler (octave_new_handler); |
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129 |
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130 #ifdef SIGABRT |
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131 signal (SIGABRT, generic_sig_handler); |
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132 #endif |
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133 |
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134 #ifdef SIGALRM |
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135 signal (SIGALRM, generic_sig_handler); |
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136 #endif |
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137 |
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138 #ifdef SIGBUS |
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139 signal (SIGBUS, generic_sig_handler); |
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140 #endif |
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141 |
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142 #ifdef SIGEMT |
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143 signal (SIGEMT, generic_sig_handler); |
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144 #endif |
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145 |
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146 #ifdef SIGFPE |
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147 signal (SIGFPE, generic_sig_handler); |
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148 #endif |
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149 |
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150 #ifdef SIGHUP |
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151 signal (SIGHUP, generic_sig_handler); |
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152 #endif |
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153 |
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154 #ifdef SIGILL |
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155 signal (SIGILL, generic_sig_handler); |
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156 #endif |
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157 |
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158 #ifdef SIGINT |
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159 signal (SIGINT, sigint_handler); |
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160 #endif |
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161 |
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162 #ifdef SIGIOT |
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163 signal (SIGIOT, generic_sig_handler); |
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164 #endif |
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165 |
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166 #ifdef SIGLOST |
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167 signal (SIGLOST, generic_sig_handler); |
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168 #endif |
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169 |
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170 #ifdef SIGPIPE |
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171 signal (SIGPIPE, sigpipe_handler); |
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172 #endif |
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173 |
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174 #ifdef SIGPOLL |
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175 signal (SIGPOLL, SIG_IGN); |
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176 #endif |
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177 |
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178 #ifdef SIGPROF |
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179 signal (SIGPROF, generic_sig_handler); |
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180 #endif |
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181 |
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182 #ifdef SIGQUIT |
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183 signal (SIGQUIT, generic_sig_handler); |
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184 #endif |
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185 |
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186 #ifdef SIGSEGV |
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187 signal (SIGSEGV, generic_sig_handler); |
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188 #endif |
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189 |
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190 #ifdef SIGSYS |
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191 signal (SIGSYS, generic_sig_handler); |
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192 #endif |
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193 |
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194 #ifdef SIGTERM |
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195 signal (SIGTERM, generic_sig_handler); |
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196 #endif |
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197 |
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198 #ifdef SIGTRAP |
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199 signal (SIGTRAP, generic_sig_handler); |
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200 #endif |
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201 |
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202 #ifdef SIGUSR1 |
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203 signal (SIGUSR1, generic_sig_handler); |
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204 #endif |
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205 |
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206 #ifdef SIGUSR2 |
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207 signal (SIGUSR2, generic_sig_handler); |
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208 #endif |
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209 |
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210 #ifdef SIGVTALRM |
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211 signal (SIGVTALRM, generic_sig_handler); |
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212 #endif |
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213 |
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214 #ifdef SIGIO |
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215 signal (SIGIO, SIG_IGN); |
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216 #endif |
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217 |
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218 #ifdef SIGXCPU |
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219 signal (SIGXCPU, generic_sig_handler); |
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220 #endif |
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221 |
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222 #ifdef SIGXFSZ |
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223 signal (SIGXFSZ, generic_sig_handler); |
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224 #endif |
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225 } |
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226 |
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227 #ifndef HAVE_SYS_SIGLIST |
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228 char *sys_siglist[NSIG + 1] = |
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229 { |
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230 #ifdef AIX |
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231 /* AIX has changed the signals a bit */ |
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232 "bogus signal", /* 0 */ |
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233 "hangup", /* 1 SIGHUP */ |
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234 "interrupt", /* 2 SIGINT */ |
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235 "quit", /* 3 SIGQUIT */ |
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236 "illegal instruction", /* 4 SIGILL */ |
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237 "trace trap", /* 5 SIGTRAP */ |
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238 "IOT instruction", /* 6 SIGIOT */ |
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239 "crash likely", /* 7 SIGDANGER */ |
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240 "floating point exception", /* 8 SIGFPE */ |
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241 "kill", /* 9 SIGKILL */ |
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242 "bus error", /* 10 SIGBUS */ |
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243 "segmentation violation", /* 11 SIGSEGV */ |
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244 "bad argument to system call", /* 12 SIGSYS */ |
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245 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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246 "alarm clock", /* 14 SIGALRM */ |
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247 "software termination signum", /* 15 SIGTERM */ |
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248 "user defined signal 1", /* 16 SIGUSR1 */ |
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249 "user defined signal 2", /* 17 SIGUSR2 */ |
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250 "death of a child", /* 18 SIGCLD */ |
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251 "power-fail restart", /* 19 SIGPWR */ |
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252 "bogus signal", /* 20 */ |
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253 "bogus signal", /* 21 */ |
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254 "bogus signal", /* 22 */ |
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255 "bogus signal", /* 23 */ |
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256 "bogus signal", /* 24 */ |
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257 "LAN I/O interrupt", /* 25 SIGAIO */ |
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258 "PTY I/O interrupt", /* 26 SIGPTY */ |
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259 "I/O intervention required", /* 27 SIGIOINT */ |
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260 "HFT grant", /* 28 SIGGRANT */ |
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261 "HFT retract", /* 29 SIGRETRACT */ |
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262 "HFT sound done", /* 30 SIGSOUND */ |
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263 "HFT input ready", /* 31 SIGMSG */ |
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264 #else /* not AIX */ |
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265 "bogus signal", /* 0 */ |
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266 "hangup", /* 1 SIGHUP */ |
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267 "interrupt", /* 2 SIGINT */ |
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268 "quit", /* 3 SIGQUIT */ |
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269 "illegal instruction", /* 4 SIGILL */ |
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270 "trace trap", /* 5 SIGTRAP */ |
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271 "IOT instruction", /* 6 SIGIOT */ |
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272 "EMT instruction", /* 7 SIGEMT */ |
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273 "floating point exception", /* 8 SIGFPE */ |
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274 "kill", /* 9 SIGKILL */ |
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275 "bus error", /* 10 SIGBUS */ |
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276 "segmentation violation", /* 11 SIGSEGV */ |
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277 "bad argument to system call", /* 12 SIGSYS */ |
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278 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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279 "alarm clock", /* 14 SIGALRM */ |
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280 "software termination signum", /* 15 SIGTERM */ |
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281 "user defined signal 1", /* 16 SIGUSR1 */ |
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282 "user defined signal 2", /* 17 SIGUSR2 */ |
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283 "death of a child", /* 18 SIGCLD */ |
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284 "power-fail restart", /* 19 SIGPWR */ |
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285 #ifdef sun |
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286 "window size change", /* 20 SIGWINCH */ |
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287 "urgent socket condition", /* 21 SIGURG */ |
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288 "pollable event occured", /* 22 SIGPOLL */ |
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289 "stop (cannot be caught or ignored)", /* 23 SIGSTOP */ |
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290 "user stop requested from tty", /* 24 SIGTSTP */ |
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291 "stopped process has been continued", /* 25 SIGCONT */ |
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292 "background tty read attempted", /* 26 SIGTTIN */ |
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293 "background tty write attempted", /* 27 SIGTTOU */ |
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294 "virtual timer expired", /* 28 SIGVTALRM */ |
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295 "profiling timer expired", /* 29 SIGPROF */ |
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296 "exceeded cpu limit", /* 30 SIGXCPU */ |
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297 "exceeded file size limit", /* 31 SIGXFSZ */ |
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298 "process's lwps are blocked", /* 32 SIGWAITING */ |
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299 "special signal used by thread library", /* 33 SIGLWP */ |
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300 #ifdef SIGFREEZE |
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301 "Special Signal Used By CPR", /* 34 SIGFREEZE */ |
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302 #endif |
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303 #ifdef SIGTHAW |
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304 "Special Signal Used By CPR", /* 35 SIGTHAW */ |
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305 #endif |
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306 #endif /* sun */ |
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307 #endif /* not AIX */ |
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308 0 |
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309 }; |
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310 #endif |
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311 |
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312 /* |
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313 ;;; Local Variables: *** |
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314 ;;; mode: C++ *** |
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315 ;;; page-delimiter: "^/\\*" *** |
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316 ;;; End: *** |
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317 */ |
