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