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1 /* |
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2 |
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3 Copyright (C) 1996 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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240
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <csignal> |
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28 #include <new> |
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29 |
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30 #include <iostream.h> |
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31 |
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32 #ifdef HAVE_UNISTD_H |
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33 #include <sys/types.h> |
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34 #include <unistd.h> |
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35 #endif |
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36 |
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37 #include "error.h" |
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38 #include "load-save.h" |
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1670
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39 #include "toplev.h" |
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40 #include "sighandlers.h" |
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41 #include "syswait.h" |
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42 #include "utils.h" |
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43 |
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44 // Nonzero means we have already printed a message for this series of |
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45 // SIGPIPES. We assume that the writer will eventually give up. |
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46 int pipe_handler_error_count = 0; |
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47 |
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48 // Nonzero means we can be interrupted. |
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49 int can_interrupt = 0; |
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50 |
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51 // Allow us to save the signal mask and then restore it to the most |
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52 // recently saved value. This is necessary when using the POSIX |
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53 // signal handling interface on some systems calling longjmp out of |
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54 // the signal handler to get to the top level on an interrupt doesn't |
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55 // restore the original signal mask. Alternatively, we could use |
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56 // sigsetjmp/siglongjmp, but saving and restoring the signal mask |
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57 // ourselves works ok and seems simpler just now. |
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58 |
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59 #if defined (HAVE_POSIX_SIGNALS) |
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60 static sigset_t octave_signal_mask; |
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61 #endif |
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62 |
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63 void |
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64 octave_save_signal_mask (void) |
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65 { |
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66 #if defined (HAVE_POSIX_SIGNALS) |
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67 sigprocmask (0, 0, &octave_signal_mask); |
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68 #endif |
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69 } |
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70 |
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71 void |
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72 octave_restore_signal_mask (void) |
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73 { |
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74 #if defined (HAVE_POSIX_SIGNALS) |
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75 sigprocmask (SIG_SETMASK, &octave_signal_mask, 0); |
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76 #endif |
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77 } |
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78 |
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79 static void |
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80 my_friendly_exit (const char *sig_name, int sig_number) |
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81 { |
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82 error ("%s -- stopping myself...", sig_name); |
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83 |
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84 save_user_variables (); |
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85 |
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86 clean_up_and_exit (sig_number); |
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87 } |
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88 |
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89 // I know, not really a signal handler. |
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90 |
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91 static void |
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92 octave_new_handler (void) |
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93 { |
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94 error ("memory exhausted -- trying to return to prompt"); |
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95 |
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96 if (can_interrupt) |
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97 { |
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98 jump_to_top_level (); |
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99 panic_impossible (); |
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100 } |
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101 else |
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102 my_friendly_exit ("operator new", 1); |
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103 } |
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104 |
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105 sig_handler * |
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106 octave_set_signal_handler (int sig, sig_handler *handler) |
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107 { |
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108 #if defined (HAVE_POSIX_SIGNALS) |
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109 struct sigaction act, oact; |
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110 act.sa_handler = handler; |
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111 act.sa_flags = 0; |
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112 sigemptyset (&act.sa_mask); |
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113 sigemptyset (&oact.sa_mask); |
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114 sigaction (sig, &act, &oact); |
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115 return oact.sa_handler; |
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116 #else |
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117 return signal (sig, handler); |
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118 #endif |
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119 } |
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120 |
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121 static RETSIGTYPE |
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122 generic_sig_handler (int sig) |
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123 { |
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124 my_friendly_exit (sys_siglist[sig], sig); |
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125 |
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126 #if RETSIGTYPE == void |
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127 return; |
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128 #else |
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129 return 0; |
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130 #endif |
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131 } |
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132 |
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133 // Handle SIGCHLD. Should use waitpid and ignore stopped jobs. |
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134 // Needs to restore state of plotter such that it will be restarted |
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135 // again when needed. Needs to close file descriptors corresponding |
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136 // to processes started with execute(). |
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137 |
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138 #if 0 |
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139 static RETSIGTYPE |
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140 sigchld_handler (int sig) |
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141 { |
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142 int status; |
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143 pid_t pid = wait (&status); |
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144 |
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145 if (pid < 0) |
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146 cerr << "wait error\n"; |
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147 else |
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148 { |
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149 cerr << "sigchld caught, PID = " << pid << "; status: "; |
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150 |
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151 int lo_byte = (status & 0xff); |
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152 int hi_byte = ((status >> 8) & 0xff); |
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153 if (lo_byte == 0177) |
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154 { |
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155 cerr << "stopped with signal = " << hi_byte << "\n"; |
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156 } |
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157 else if (lo_byte) |
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158 { |
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159 int sig_num = (lo_byte & 0x7f); |
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160 cerr << "stopped with signal = " << sig_num << "\n"; |
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161 if (lo_byte & 0200) |
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162 cerr << "child dumped core\n"; |
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163 } |
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164 else |
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165 { |
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166 cerr << "exited with status = " << hi_byte << "\n"; |
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167 } |
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168 } |
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169 |
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170 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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171 } |
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172 #endif |
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173 |
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174 #if defined (__alpha__) |
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175 static RETSIGTYPE |
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176 sigfpe_handler (int /* sig */) |
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177 { |
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178 // Can this ever cause trouble on systems that don't forget signal |
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179 // handlers when they are invoked? |
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180 |
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181 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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182 |
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183 error ("floating point exception -- trying to return to prompt"); |
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184 |
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185 if (can_interrupt) |
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186 { |
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187 jump_to_top_level (); |
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188 panic_impossible (); |
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189 } |
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190 |
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191 #if RETSIGTYPE == void |
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192 return; |
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193 #else |
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194 return 0; |
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195 #endif |
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196 } |
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197 #endif |
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198 |
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199 // Handle SIGINT by restarting the parser (see octave.cc). |
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200 |
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201 static RETSIGTYPE |
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202 sigint_handler (int /* sig */) |
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203 { |
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204 // Can this ever cause trouble on systems that don't forget signal |
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205 // handlers when they are invoked? |
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206 |
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207 octave_set_signal_handler (SIGINT, sigint_handler); |
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208 |
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209 if (can_interrupt) |
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210 { |
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211 jump_to_top_level (); |
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212 panic_impossible (); |
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213 } |
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214 |
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215 #if RETSIGTYPE == void |
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216 return; |
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217 #else |
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218 return 0; |
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219 #endif |
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220 } |
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221 |
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222 static RETSIGTYPE |
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223 sigpipe_handler (int /* sig */) |
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224 { |
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225 // Can this ever cause trouble on systems that don't forget signal |
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226 // handlers when they are invoked? |
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227 |
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228 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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229 |
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230 if (pipe_handler_error_count++ == 0) |
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231 message (0, "broken pipe"); |
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232 |
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233 // Don't loop forever on account of this. |
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234 |
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235 if (pipe_handler_error_count > 100) |
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236 jump_to_top_level (); |
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237 |
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238 #if RETSIGTYPE == void |
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239 return; |
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240 #else |
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241 return 0; |
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242 #endif |
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243 } |
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244 |
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245 void |
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246 catch_interrupts (void) |
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247 { |
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248 octave_set_signal_handler (SIGINT, sigint_handler); |
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249 } |
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250 |
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251 // Install all the handlers for the signals we might care about. |
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252 |
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253 void |
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254 install_signal_handlers (void) |
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255 { |
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256 set_new_handler (octave_new_handler); |
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257 |
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258 #ifdef SIGABRT |
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259 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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260 #endif |
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261 |
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262 #ifdef SIGALRM |
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263 octave_set_signal_handler (SIGALRM, generic_sig_handler); |
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264 #endif |
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265 |
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266 #ifdef SIGBUS |
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267 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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268 #endif |
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269 |
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270 #if 0 |
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271 #ifdef SIGCHLD |
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272 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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273 #endif |
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274 #endif |
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275 |
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276 #ifdef SIGEMT |
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277 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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278 #endif |
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279 |
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280 #ifdef SIGFPE |
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281 #if defined (__alpha__) |
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282 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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283 #else |
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284 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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285 #endif |
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286 #endif |
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287 |
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288 #ifdef SIGHUP |
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289 octave_set_signal_handler (SIGHUP, generic_sig_handler); |
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290 #endif |
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291 |
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292 #ifdef SIGILL |
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293 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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294 #endif |
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295 |
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296 #ifdef SIGINT |
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297 octave_set_signal_handler (SIGINT, sigint_handler); |
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298 #endif |
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299 |
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300 #ifdef SIGIOT |
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301 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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302 #endif |
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303 |
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304 #ifdef SIGLOST |
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305 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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306 #endif |
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307 |
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308 #ifdef SIGPIPE |
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309 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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310 #endif |
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311 |
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312 #ifdef SIGPOLL |
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313 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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314 #endif |
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315 |
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316 #ifdef SIGPROF |
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317 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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318 #endif |
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319 |
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320 #ifdef SIGQUIT |
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321 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
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322 #endif |
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323 |
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324 #ifdef SIGSEGV |
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325 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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326 #endif |
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327 |
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328 #ifdef SIGSYS |
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329 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
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330 #endif |
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331 |
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332 #ifdef SIGTERM |
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333 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
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334 #endif |
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335 |
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336 #ifdef SIGTRAP |
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337 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
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338 #endif |
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339 |
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340 #ifdef SIGUSR1 |
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341 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
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342 #endif |
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343 |
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344 #ifdef SIGUSR2 |
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345 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
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346 #endif |
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347 |
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348 #ifdef SIGVTALRM |
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349 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
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350 #endif |
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351 |
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352 #ifdef SIGIO |
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353 octave_set_signal_handler (SIGIO, SIG_IGN); |
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354 #endif |
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355 |
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356 #ifdef SIGXCPU |
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357 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
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358 #endif |
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359 |
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360 #ifdef SIGXFSZ |
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361 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
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362 #endif |
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363 } |
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364 |
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365 #ifndef HAVE_SYS_SIGLIST |
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366 char *sys_siglist[NSIG + 1] = |
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367 { |
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368 #ifdef AIX |
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369 /* AIX has changed the signals a bit */ |
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370 "bogus signal", /* 0 */ |
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371 "hangup", /* 1 SIGHUP */ |
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372 "interrupt", /* 2 SIGINT */ |
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373 "quit", /* 3 SIGQUIT */ |
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374 "illegal instruction", /* 4 SIGILL */ |
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375 "trace trap", /* 5 SIGTRAP */ |
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376 "IOT instruction", /* 6 SIGIOT */ |
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377 "crash likely", /* 7 SIGDANGER */ |
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378 "floating point exception", /* 8 SIGFPE */ |
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379 "kill", /* 9 SIGKILL */ |
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380 "bus error", /* 10 SIGBUS */ |
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381 "segmentation violation", /* 11 SIGSEGV */ |
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382 "bad argument to system call", /* 12 SIGSYS */ |
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383 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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384 "alarm clock", /* 14 SIGALRM */ |
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385 "software termination signum", /* 15 SIGTERM */ |
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386 "user defined signal 1", /* 16 SIGUSR1 */ |
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387 "user defined signal 2", /* 17 SIGUSR2 */ |
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388 "death of a child", /* 18 SIGCLD */ |
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389 "power-fail restart", /* 19 SIGPWR */ |
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390 "bogus signal", /* 20 */ |
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391 "bogus signal", /* 21 */ |
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392 "bogus signal", /* 22 */ |
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393 "bogus signal", /* 23 */ |
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394 "bogus signal", /* 24 */ |
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395 "LAN I/O interrupt", /* 25 SIGAIO */ |
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396 "PTY I/O interrupt", /* 26 SIGPTY */ |
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397 "I/O intervention required", /* 27 SIGIOINT */ |
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398 "HFT grant", /* 28 SIGGRANT */ |
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399 "HFT retract", /* 29 SIGRETRACT */ |
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400 "HFT sound done", /* 30 SIGSOUND */ |
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401 "HFT input ready", /* 31 SIGMSG */ |
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402 #else /* not AIX */ |
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403 "bogus signal", /* 0 */ |
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404 "hangup", /* 1 SIGHUP */ |
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405 "interrupt", /* 2 SIGINT */ |
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406 "quit", /* 3 SIGQUIT */ |
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407 "illegal instruction", /* 4 SIGILL */ |
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408 "trace trap", /* 5 SIGTRAP */ |
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409 "IOT instruction", /* 6 SIGIOT */ |
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410 "EMT instruction", /* 7 SIGEMT */ |
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411 "floating point exception", /* 8 SIGFPE */ |
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412 "kill", /* 9 SIGKILL */ |
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413 "bus error", /* 10 SIGBUS */ |
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414 "segmentation violation", /* 11 SIGSEGV */ |
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415 "bad argument to system call", /* 12 SIGSYS */ |
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416 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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417 "alarm clock", /* 14 SIGALRM */ |
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418 "software termination signum", /* 15 SIGTERM */ |
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419 "user defined signal 1", /* 16 SIGUSR1 */ |
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420 "user defined signal 2", /* 17 SIGUSR2 */ |
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421 "death of a child", /* 18 SIGCLD */ |
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422 "power-fail restart", /* 19 SIGPWR */ |
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423 #ifdef sun |
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424 "window size change", /* 20 SIGWINCH */ |
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425 "urgent socket condition", /* 21 SIGURG */ |
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426 "pollable event occured", /* 22 SIGPOLL */ |
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427 "stop (cannot be caught or ignored)", /* 23 SIGSTOP */ |
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428 "user stop requested from tty", /* 24 SIGTSTP */ |
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429 "stopped process has been continued", /* 25 SIGCONT */ |
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430 "background tty read attempted", /* 26 SIGTTIN */ |
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431 "background tty write attempted", /* 27 SIGTTOU */ |
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432 "virtual timer expired", /* 28 SIGVTALRM */ |
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433 "profiling timer expired", /* 29 SIGPROF */ |
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434 "exceeded cpu limit", /* 30 SIGXCPU */ |
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435 "exceeded file size limit", /* 31 SIGXFSZ */ |
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436 "process's lwps are blocked", /* 32 SIGWAITING */ |
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437 "special signal used by thread library", /* 33 SIGLWP */ |
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438 #ifdef SIGFREEZE |
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439 "Special Signal Used By CPR", /* 34 SIGFREEZE */ |
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440 #endif |
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441 #ifdef SIGTHAW |
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442 "Special Signal Used By CPR", /* 35 SIGTHAW */ |
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443 #endif |
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444 #endif /* sun */ |
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445 #endif /* not AIX */ |
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446 0 |
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447 }; |
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448 #endif |
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449 |
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450 /* |
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451 ;;; Local Variables: *** |
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452 ;;; mode: C++ *** |
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453 ;;; End: *** |
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454 */ |
