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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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39 #include "pager.h" |
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40 #include "sighandlers.h" |
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41 #include "syswait.h" |
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42 #include "toplev.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 // Allow us to save the signal mask and then restore it to the most |
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53 // recently saved value. This is necessary when using the POSIX |
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54 // signal handling interface on some systems calling longjmp out of |
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55 // the signal handler to get to the top level on an interrupt doesn't |
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56 // restore the original signal mask. Alternatively, we could use |
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57 // sigsetjmp/siglongjmp, but saving and restoring the signal mask |
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58 // ourselves works ok and seems simpler just now. |
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59 |
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60 #if defined (HAVE_POSIX_SIGNALS) |
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61 static sigset_t octave_signal_mask; |
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62 #endif |
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63 |
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64 void |
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65 octave_save_signal_mask (void) |
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66 { |
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67 #if defined (HAVE_POSIX_SIGNALS) |
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68 sigprocmask (0, 0, &octave_signal_mask); |
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69 #endif |
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70 } |
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71 |
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72 void |
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73 octave_restore_signal_mask (void) |
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74 { |
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75 #if defined (HAVE_POSIX_SIGNALS) |
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76 sigprocmask (SIG_SETMASK, &octave_signal_mask, 0); |
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77 #endif |
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78 } |
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79 |
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80 static void |
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81 my_friendly_exit (const char *sig_name, int sig_number) |
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82 { |
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83 error ("%s -- stopping myself...", sig_name); |
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84 |
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85 save_user_variables (); |
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86 |
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87 clean_up_and_exit (sig_number); |
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88 } |
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89 |
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90 // I know, not really a signal handler. |
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91 |
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92 static void |
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93 octave_new_handler (void) |
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94 { |
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95 error ("memory exhausted -- trying to return to prompt"); |
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96 |
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97 if (can_interrupt) |
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98 { |
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99 jump_to_top_level (); |
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100 panic_impossible (); |
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101 } |
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102 else |
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103 my_friendly_exit ("operator new", 1); |
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104 } |
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105 |
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106 sig_handler * |
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107 octave_set_signal_handler (int sig, sig_handler *handler) |
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108 { |
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109 #if defined (HAVE_POSIX_SIGNALS) |
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110 struct sigaction act, oact; |
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111 act.sa_handler = handler; |
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112 act.sa_flags = 0; |
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113 sigemptyset (&act.sa_mask); |
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114 sigemptyset (&oact.sa_mask); |
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115 sigaction (sig, &act, &oact); |
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116 return oact.sa_handler; |
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117 #else |
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118 return signal (sig, handler); |
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119 #endif |
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120 } |
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121 |
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122 static RETSIGTYPE |
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123 generic_sig_handler (int sig) |
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124 { |
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125 my_friendly_exit (sys_siglist[sig], sig); |
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126 |
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127 #if RETSIGTYPE == void |
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128 return; |
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129 #else |
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130 return 0; |
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131 #endif |
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132 } |
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133 |
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134 // Handle SIGCHLD. |
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135 |
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136 // XXX FIXME XXX -- this should probably be implemented by having a |
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137 // global list of pids to check and a corresponding list of functions |
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138 // to call if a pid is recognized. That way, we just have to register |
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139 // functions elsewhere and this function doesn't have to change. |
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140 |
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141 static RETSIGTYPE |
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142 sigchld_handler (int /* sig */) |
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143 { |
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144 // Can this ever cause trouble on systems that don't forget signal |
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145 // handlers when they are invoked? |
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146 |
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147 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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148 |
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149 if (octave_pager_pid > 0) |
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150 { |
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151 int status; |
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152 pid_t pid = waitpid (octave_pager_pid, &status, 0); |
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153 |
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154 if (pid > 0) |
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155 { |
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156 if (WIFEXITED (status) || WIFSIGNALLED (status)) |
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157 { |
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158 octave_pager_pid = -1; |
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159 |
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160 // XXX FIXME XXX -- I'm not sure that this is the right |
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161 // thing to do here, but it seems to work. |
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162 |
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163 // Don't call error() here because that tries to flush |
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164 // pending output, which isn't going to do anything |
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165 // anyway. |
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166 |
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167 cerr << "error: connection to external pager lost --\n"; |
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168 cerr << "error: pending computations and output have been discarded\n"; |
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169 } |
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170 } |
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171 } |
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172 } |
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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 #ifdef SIGCHLD |
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271 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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272 #endif |
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273 |
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274 #ifdef SIGEMT |
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275 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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276 #endif |
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277 |
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278 #ifdef SIGFPE |
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279 #if defined (__alpha__) |
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280 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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281 #else |
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282 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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283 #endif |
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284 #endif |
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285 |
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286 #ifdef SIGHUP |
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287 octave_set_signal_handler (SIGHUP, generic_sig_handler); |
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288 #endif |
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289 |
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290 #ifdef SIGILL |
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291 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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292 #endif |
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293 |
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294 #ifdef SIGINT |
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295 octave_set_signal_handler (SIGINT, sigint_handler); |
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296 #endif |
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297 |
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298 #ifdef SIGIOT |
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299 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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300 #endif |
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301 |
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302 #ifdef SIGLOST |
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303 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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304 #endif |
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305 |
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306 #ifdef SIGPIPE |
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307 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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308 #endif |
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309 |
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310 #ifdef SIGPOLL |
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311 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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312 #endif |
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313 |
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314 #ifdef SIGPROF |
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315 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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316 #endif |
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317 |
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318 #ifdef SIGQUIT |
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319 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
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320 #endif |
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321 |
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322 #ifdef SIGSEGV |
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323 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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324 #endif |
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325 |
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326 #ifdef SIGSYS |
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327 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
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328 #endif |
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329 |
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330 #ifdef SIGTERM |
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331 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
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332 #endif |
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333 |
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334 #ifdef SIGTRAP |
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335 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
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336 #endif |
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337 |
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338 #ifdef SIGUSR1 |
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339 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
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340 #endif |
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341 |
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342 #ifdef SIGUSR2 |
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343 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
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344 #endif |
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345 |
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346 #ifdef SIGVTALRM |
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347 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
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348 #endif |
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349 |
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350 #ifdef SIGIO |
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351 octave_set_signal_handler (SIGIO, SIG_IGN); |
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352 #endif |
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353 |
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354 #ifdef SIGXCPU |
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355 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
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356 #endif |
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357 |
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358 #ifdef SIGXFSZ |
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359 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
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360 #endif |
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361 } |
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362 |
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363 #ifndef HAVE_SYS_SIGLIST |
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364 char *sys_siglist[NSIG + 1] = |
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365 { |
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366 #ifdef AIX |
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367 /* AIX has changed the signals a bit */ |
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368 "bogus signal", /* 0 */ |
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369 "hangup", /* 1 SIGHUP */ |
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370 "interrupt", /* 2 SIGINT */ |
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371 "quit", /* 3 SIGQUIT */ |
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372 "illegal instruction", /* 4 SIGILL */ |
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373 "trace trap", /* 5 SIGTRAP */ |
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374 "IOT instruction", /* 6 SIGIOT */ |
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375 "crash likely", /* 7 SIGDANGER */ |
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376 "floating point exception", /* 8 SIGFPE */ |
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377 "kill", /* 9 SIGKILL */ |
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378 "bus error", /* 10 SIGBUS */ |
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379 "segmentation violation", /* 11 SIGSEGV */ |
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380 "bad argument to system call", /* 12 SIGSYS */ |
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381 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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382 "alarm clock", /* 14 SIGALRM */ |
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383 "software termination signum", /* 15 SIGTERM */ |
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384 "user defined signal 1", /* 16 SIGUSR1 */ |
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385 "user defined signal 2", /* 17 SIGUSR2 */ |
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386 "death of a child", /* 18 SIGCLD */ |
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387 "power-fail restart", /* 19 SIGPWR */ |
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388 "bogus signal", /* 20 */ |
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389 "bogus signal", /* 21 */ |
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390 "bogus signal", /* 22 */ |
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391 "bogus signal", /* 23 */ |
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392 "bogus signal", /* 24 */ |
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393 "LAN I/O interrupt", /* 25 SIGAIO */ |
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394 "PTY I/O interrupt", /* 26 SIGPTY */ |
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395 "I/O intervention required", /* 27 SIGIOINT */ |
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396 "HFT grant", /* 28 SIGGRANT */ |
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397 "HFT retract", /* 29 SIGRETRACT */ |
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398 "HFT sound done", /* 30 SIGSOUND */ |
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399 "HFT input ready", /* 31 SIGMSG */ |
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400 #else /* not AIX */ |
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401 "bogus signal", /* 0 */ |
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402 "hangup", /* 1 SIGHUP */ |
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403 "interrupt", /* 2 SIGINT */ |
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404 "quit", /* 3 SIGQUIT */ |
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405 "illegal instruction", /* 4 SIGILL */ |
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406 "trace trap", /* 5 SIGTRAP */ |
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407 "IOT instruction", /* 6 SIGIOT */ |
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408 "EMT instruction", /* 7 SIGEMT */ |
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409 "floating point exception", /* 8 SIGFPE */ |
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410 "kill", /* 9 SIGKILL */ |
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411 "bus error", /* 10 SIGBUS */ |
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412 "segmentation violation", /* 11 SIGSEGV */ |
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413 "bad argument to system call", /* 12 SIGSYS */ |
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414 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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415 "alarm clock", /* 14 SIGALRM */ |
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416 "software termination signum", /* 15 SIGTERM */ |
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417 "user defined signal 1", /* 16 SIGUSR1 */ |
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418 "user defined signal 2", /* 17 SIGUSR2 */ |
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419 "death of a child", /* 18 SIGCLD */ |
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420 "power-fail restart", /* 19 SIGPWR */ |
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421 #ifdef sun |
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422 "window size change", /* 20 SIGWINCH */ |
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423 "urgent socket condition", /* 21 SIGURG */ |
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424 "pollable event occured", /* 22 SIGPOLL */ |
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425 "stop (cannot be caught or ignored)", /* 23 SIGSTOP */ |
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426 "user stop requested from tty", /* 24 SIGTSTP */ |
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427 "stopped process has been continued", /* 25 SIGCONT */ |
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428 "background tty read attempted", /* 26 SIGTTIN */ |
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429 "background tty write attempted", /* 27 SIGTTOU */ |
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430 "virtual timer expired", /* 28 SIGVTALRM */ |
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431 "profiling timer expired", /* 29 SIGPROF */ |
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432 "exceeded cpu limit", /* 30 SIGXCPU */ |
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433 "exceeded file size limit", /* 31 SIGXFSZ */ |
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434 "process's lwps are blocked", /* 32 SIGWAITING */ |
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435 "special signal used by thread library", /* 33 SIGLWP */ |
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436 #ifdef SIGFREEZE |
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437 "Special Signal Used By CPR", /* 34 SIGFREEZE */ |
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438 #endif |
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439 #ifdef SIGTHAW |
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440 "Special Signal Used By CPR", /* 35 SIGTHAW */ |
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441 #endif |
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442 #endif /* sun */ |
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443 #endif /* not AIX */ |
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444 0 |
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445 }; |
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446 #endif |
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447 |
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448 /* |
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449 ;;; Local Variables: *** |
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450 ;;; mode: C++ *** |
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451 ;;; End: *** |
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452 */ |
