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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, 1995 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 <csignal> |
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29 #include <new> |
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30 |
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31 #include <iostream.h> |
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32 |
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33 #ifdef HAVE_UNISTD_H |
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34 #include <sys/types.h> |
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35 #include <unistd.h> |
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36 #endif |
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37 |
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38 #include "error.h" |
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39 #include "load-save.h" |
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40 #include "toplev.h" |
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41 #include "sighandlers.h" |
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42 #include "syswait.h" |
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43 #include "utils.h" |
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44 |
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45 // Nonzero means we have already printed a message for this series of |
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46 // SIGPIPES. We assume that the writer will eventually give up. |
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47 int pipe_handler_error_count = 0; |
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48 |
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49 // Nonzero means we can be interrupted. |
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50 int can_interrupt = 0; |
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51 |
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52 static void |
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53 my_friendly_exit (const char *sig_name, int sig_number) |
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54 { |
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55 error ("%s -- stopping myself...", sig_name); |
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56 |
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57 save_user_variables (); |
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58 |
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59 clean_up_and_exit (sig_number); |
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60 } |
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61 |
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62 // I know, not really a signal handler. |
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63 |
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64 static void |
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65 octave_new_handler (void) |
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66 { |
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67 error ("memory exhausted -- trying to return to prompt"); |
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68 |
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69 if (can_interrupt) |
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70 { |
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71 jump_to_top_level (); |
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72 panic_impossible (); |
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73 } |
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74 else |
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75 my_friendly_exit ("operator new", 1); |
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76 } |
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77 |
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78 sig_handler * |
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79 octave_set_signal_handler (int sig, sig_handler *handler) |
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80 { |
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81 #if defined (HAVE_POSIX_SIGNALS) |
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82 struct sigaction act, oact; |
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83 act.sa_handler = handler; |
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84 act.sa_flags = 0; |
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85 sigemptyset (&act.sa_mask); |
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86 sigemptyset (&oact.sa_mask); |
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87 sigaction (sig, &act, &oact); |
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88 return oact.sa_handler; |
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89 #else |
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90 return signal (sig, handler); |
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91 #endif |
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92 } |
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93 |
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94 static RETSIGTYPE |
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95 generic_sig_handler (int sig) |
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96 { |
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97 my_friendly_exit (sys_siglist[sig], sig); |
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98 |
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99 #if RETSIGTYPE == void |
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100 return; |
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101 #else |
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102 return 0; |
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103 #endif |
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104 } |
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105 |
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106 // Handle SIGCHLD. Should use waitpid and ignore stopped jobs. |
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107 // Needs to restore state of plotter such that it will be restarted |
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108 // again when needed. Needs to close file descriptors corresponding |
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109 // to processes started with execute(). |
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110 |
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111 #if 0 |
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112 static RETSIGTYPE |
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113 sigchld_handler (int sig) |
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114 { |
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115 int status; |
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116 pid_t pid = wait (&status); |
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117 |
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118 if (pid < 0) |
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119 cerr << "wait error\n"; |
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120 else |
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121 { |
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122 cerr << "sigchld caught, PID = " << pid << "; status: "; |
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123 |
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124 int lo_byte = (status & 0xff); |
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125 int hi_byte = ((status >> 8) & 0xff); |
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126 if (lo_byte == 0177) |
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127 { |
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128 cerr << "stopped with signal = " << hi_byte << "\n"; |
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129 } |
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130 else if (lo_byte) |
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131 { |
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132 int sig_num = (lo_byte & 0x7f); |
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133 cerr << "stopped with signal = " << sig_num << "\n"; |
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134 if (lo_byte & 0200) |
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135 cerr << "child dumped core\n"; |
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136 } |
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137 else |
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138 { |
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139 cerr << "exited with status = " << hi_byte << "\n"; |
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140 } |
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141 } |
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142 |
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143 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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144 } |
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145 #endif |
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146 |
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147 #if defined (__alpha__) |
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148 static RETSIGTYPE |
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149 sigfpe_handler (int /* sig */) |
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150 { |
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151 // Can this ever cause trouble on systems that don't forget signal |
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152 // handlers when they are invoked? |
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153 |
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154 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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155 |
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156 error ("floating point exception -- trying to return to prompt"); |
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157 |
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158 if (can_interrupt) |
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159 { |
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160 jump_to_top_level (); |
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161 panic_impossible (); |
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162 } |
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163 |
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164 #if RETSIGTYPE == void |
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165 return; |
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166 #else |
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167 return 0; |
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168 #endif |
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169 } |
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170 #endif |
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171 |
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172 // Handle SIGINT by restarting the parser (see octave.cc). |
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173 |
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174 static RETSIGTYPE |
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175 sigint_handler (int /* sig */) |
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176 { |
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177 // Can this ever cause trouble on systems that don't forget signal |
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178 // handlers when they are invoked? |
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179 |
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180 octave_set_signal_handler (SIGINT, sigint_handler); |
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181 |
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182 if (can_interrupt) |
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183 { |
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184 jump_to_top_level (); |
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185 panic_impossible (); |
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186 } |
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187 |
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188 #if RETSIGTYPE == void |
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189 return; |
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190 #else |
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191 return 0; |
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192 #endif |
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193 } |
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194 |
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195 static RETSIGTYPE |
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196 sigpipe_handler (int /* sig */) |
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197 { |
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198 // Can this ever cause trouble on systems that don't forget signal |
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199 // handlers when they are invoked? |
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200 |
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201 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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202 |
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203 if (pipe_handler_error_count++ == 0) |
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204 message (0, "broken pipe"); |
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205 |
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206 // Don't loop forever on account of this. |
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207 |
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208 if (pipe_handler_error_count > 100) |
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209 jump_to_top_level (); |
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210 |
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211 #if RETSIGTYPE == void |
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212 return; |
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213 #else |
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214 return 0; |
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215 #endif |
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216 } |
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217 |
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218 void |
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219 catch_interrupts (void) |
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220 { |
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221 octave_set_signal_handler (SIGINT, sigint_handler); |
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222 } |
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223 |
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224 // Install all the handlers for the signals we might care about. |
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225 |
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226 void |
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227 install_signal_handlers (void) |
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228 { |
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229 set_new_handler (octave_new_handler); |
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230 |
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231 #ifdef SIGABRT |
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232 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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233 #endif |
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234 |
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235 #ifdef SIGALRM |
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236 octave_set_signal_handler (SIGALRM, generic_sig_handler); |
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237 #endif |
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238 |
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239 #ifdef SIGBUS |
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240 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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241 #endif |
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242 |
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243 #if 0 |
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244 #ifdef SIGCHLD |
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245 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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246 #endif |
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247 #endif |
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248 |
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249 #ifdef SIGEMT |
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250 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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251 #endif |
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252 |
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253 #ifdef SIGFPE |
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254 #if defined (__alpha__) |
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255 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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256 #else |
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257 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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258 #endif |
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259 #endif |
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260 |
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261 #ifdef SIGHUP |
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262 octave_set_signal_handler (SIGHUP, generic_sig_handler); |
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263 #endif |
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264 |
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265 #ifdef SIGILL |
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266 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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267 #endif |
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268 |
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269 #ifdef SIGINT |
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270 octave_set_signal_handler (SIGINT, sigint_handler); |
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271 #endif |
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272 |
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273 #ifdef SIGIOT |
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274 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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275 #endif |
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276 |
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277 #ifdef SIGLOST |
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278 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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279 #endif |
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280 |
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281 #ifdef SIGPIPE |
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282 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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283 #endif |
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284 |
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285 #ifdef SIGPOLL |
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286 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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287 #endif |
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288 |
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289 #ifdef SIGPROF |
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290 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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291 #endif |
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292 |
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293 #ifdef SIGQUIT |
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294 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
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295 #endif |
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296 |
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297 #ifdef SIGSEGV |
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298 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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299 #endif |
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300 |
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301 #ifdef SIGSYS |
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302 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
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303 #endif |
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304 |
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305 #ifdef SIGTERM |
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306 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
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307 #endif |
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308 |
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309 #ifdef SIGTRAP |
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310 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
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311 #endif |
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312 |
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313 #ifdef SIGUSR1 |
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314 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
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315 #endif |
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316 |
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317 #ifdef SIGUSR2 |
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318 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
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319 #endif |
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320 |
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321 #ifdef SIGVTALRM |
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322 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
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323 #endif |
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324 |
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325 #ifdef SIGIO |
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326 octave_set_signal_handler (SIGIO, SIG_IGN); |
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327 #endif |
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328 |
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329 #ifdef SIGXCPU |
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330 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
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331 #endif |
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332 |
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333 #ifdef SIGXFSZ |
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334 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
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335 #endif |
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336 } |
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337 |
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338 #ifndef HAVE_SYS_SIGLIST |
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339 char *sys_siglist[NSIG + 1] = |
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340 { |
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341 #ifdef AIX |
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342 /* AIX has changed the signals a bit */ |
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343 "bogus signal", /* 0 */ |
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344 "hangup", /* 1 SIGHUP */ |
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345 "interrupt", /* 2 SIGINT */ |
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346 "quit", /* 3 SIGQUIT */ |
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347 "illegal instruction", /* 4 SIGILL */ |
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348 "trace trap", /* 5 SIGTRAP */ |
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349 "IOT instruction", /* 6 SIGIOT */ |
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350 "crash likely", /* 7 SIGDANGER */ |
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351 "floating point exception", /* 8 SIGFPE */ |
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352 "kill", /* 9 SIGKILL */ |
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353 "bus error", /* 10 SIGBUS */ |
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354 "segmentation violation", /* 11 SIGSEGV */ |
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355 "bad argument to system call", /* 12 SIGSYS */ |
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356 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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357 "alarm clock", /* 14 SIGALRM */ |
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358 "software termination signum", /* 15 SIGTERM */ |
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359 "user defined signal 1", /* 16 SIGUSR1 */ |
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360 "user defined signal 2", /* 17 SIGUSR2 */ |
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361 "death of a child", /* 18 SIGCLD */ |
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362 "power-fail restart", /* 19 SIGPWR */ |
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363 "bogus signal", /* 20 */ |
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364 "bogus signal", /* 21 */ |
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365 "bogus signal", /* 22 */ |
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366 "bogus signal", /* 23 */ |
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367 "bogus signal", /* 24 */ |
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368 "LAN I/O interrupt", /* 25 SIGAIO */ |
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369 "PTY I/O interrupt", /* 26 SIGPTY */ |
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370 "I/O intervention required", /* 27 SIGIOINT */ |
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371 "HFT grant", /* 28 SIGGRANT */ |
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372 "HFT retract", /* 29 SIGRETRACT */ |
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373 "HFT sound done", /* 30 SIGSOUND */ |
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374 "HFT input ready", /* 31 SIGMSG */ |
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375 #else /* not AIX */ |
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376 "bogus signal", /* 0 */ |
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377 "hangup", /* 1 SIGHUP */ |
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378 "interrupt", /* 2 SIGINT */ |
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379 "quit", /* 3 SIGQUIT */ |
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380 "illegal instruction", /* 4 SIGILL */ |
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381 "trace trap", /* 5 SIGTRAP */ |
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382 "IOT instruction", /* 6 SIGIOT */ |
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383 "EMT instruction", /* 7 SIGEMT */ |
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384 "floating point exception", /* 8 SIGFPE */ |
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385 "kill", /* 9 SIGKILL */ |
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386 "bus error", /* 10 SIGBUS */ |
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387 "segmentation violation", /* 11 SIGSEGV */ |
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388 "bad argument to system call", /* 12 SIGSYS */ |
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389 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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390 "alarm clock", /* 14 SIGALRM */ |
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391 "software termination signum", /* 15 SIGTERM */ |
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392 "user defined signal 1", /* 16 SIGUSR1 */ |
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393 "user defined signal 2", /* 17 SIGUSR2 */ |
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394 "death of a child", /* 18 SIGCLD */ |
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395 "power-fail restart", /* 19 SIGPWR */ |
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396 #ifdef sun |
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397 "window size change", /* 20 SIGWINCH */ |
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398 "urgent socket condition", /* 21 SIGURG */ |
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399 "pollable event occured", /* 22 SIGPOLL */ |
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400 "stop (cannot be caught or ignored)", /* 23 SIGSTOP */ |
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401 "user stop requested from tty", /* 24 SIGTSTP */ |
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402 "stopped process has been continued", /* 25 SIGCONT */ |
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403 "background tty read attempted", /* 26 SIGTTIN */ |
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404 "background tty write attempted", /* 27 SIGTTOU */ |
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405 "virtual timer expired", /* 28 SIGVTALRM */ |
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406 "profiling timer expired", /* 29 SIGPROF */ |
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407 "exceeded cpu limit", /* 30 SIGXCPU */ |
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408 "exceeded file size limit", /* 31 SIGXFSZ */ |
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409 "process's lwps are blocked", /* 32 SIGWAITING */ |
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410 "special signal used by thread library", /* 33 SIGLWP */ |
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411 #ifdef SIGFREEZE |
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412 "Special Signal Used By CPR", /* 34 SIGFREEZE */ |
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413 #endif |
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414 #ifdef SIGTHAW |
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415 "Special Signal Used By CPR", /* 35 SIGTHAW */ |
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416 #endif |
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417 #endif /* sun */ |
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418 #endif /* not AIX */ |
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419 0 |
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420 }; |
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421 #endif |
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422 |
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423 /* |
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424 ;;; Local Variables: *** |
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425 ;;; mode: C++ *** |
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426 ;;; page-delimiter: "^/\\*" *** |
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427 ;;; End: *** |
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428 */ |
