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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 #ifdef HAVE_SYS_TYPES_H |
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34 #include <sys/types.h> |
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35 #endif |
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36 #include <unistd.h> |
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37 #endif |
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38 |
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39 #include "error.h" |
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40 #include "load-save.h" |
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41 #include "pager.h" |
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42 #include "sighandlers.h" |
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43 #include "syswait.h" |
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44 #include "toplev.h" |
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45 #include "utils.h" |
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46 |
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47 // Nonzero means we have already printed a message for this series of |
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48 // SIGPIPES. We assume that the writer will eventually give up. |
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49 int pipe_handler_error_count = 0; |
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50 |
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51 // Nonzero means we can be interrupted. |
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52 int can_interrupt = 0; |
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53 |
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54 // Allow us to save the signal mask and then restore it to the most |
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55 // recently saved value. This is necessary when using the POSIX |
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56 // signal handling interface on some systems calling longjmp out of |
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57 // the signal handler to get to the top level on an interrupt doesn't |
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58 // restore the original signal mask. Alternatively, we could use |
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59 // sigsetjmp/siglongjmp, but saving and restoring the signal mask |
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60 // ourselves works ok and seems simpler just now. |
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61 |
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62 #if defined (HAVE_POSIX_SIGNALS) |
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63 static sigset_t octave_signal_mask; |
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64 #endif |
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65 |
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66 void |
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67 octave_save_signal_mask (void) |
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68 { |
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69 #if defined (HAVE_POSIX_SIGNALS) |
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70 sigprocmask (0, 0, &octave_signal_mask); |
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71 #endif |
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72 } |
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73 |
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74 void |
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75 octave_restore_signal_mask (void) |
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76 { |
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77 #if defined (HAVE_POSIX_SIGNALS) |
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78 sigprocmask (SIG_SETMASK, &octave_signal_mask, 0); |
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79 #endif |
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80 } |
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81 |
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82 static void |
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83 my_friendly_exit (const char *sig_name, int sig_number) |
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84 { |
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85 error ("%s -- stopping myself...", sig_name); |
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86 |
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87 save_user_variables (); |
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88 |
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89 clean_up_and_exit (sig_number); |
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90 } |
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91 |
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92 // I know, not really a signal handler. |
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93 |
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94 static void |
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95 octave_new_handler (void) |
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96 { |
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97 error ("memory exhausted -- trying to return to prompt"); |
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98 |
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99 if (can_interrupt) |
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100 { |
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101 jump_to_top_level (); |
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102 panic_impossible (); |
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103 } |
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104 else |
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105 my_friendly_exit ("operator new", 1); |
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106 } |
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107 |
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108 sig_handler * |
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109 octave_set_signal_handler (int sig, sig_handler *handler) |
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110 { |
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111 #if defined (HAVE_POSIX_SIGNALS) |
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112 struct sigaction act, oact; |
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113 act.sa_handler = handler; |
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114 act.sa_flags = 0; |
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115 sigemptyset (&act.sa_mask); |
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116 sigemptyset (&oact.sa_mask); |
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117 sigaction (sig, &act, &oact); |
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118 return oact.sa_handler; |
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119 #else |
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120 return signal (sig, handler); |
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121 #endif |
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122 } |
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123 |
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124 static RETSIGTYPE |
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125 generic_sig_handler (int sig) |
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126 { |
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127 my_friendly_exit (sys_siglist[sig], sig); |
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128 |
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129 #if RETSIGTYPE == void |
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130 return; |
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131 #else |
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132 return 0; |
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133 #endif |
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134 } |
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135 |
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136 // Handle SIGCHLD. |
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137 |
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138 static RETSIGTYPE |
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139 sigchld_handler (int /* sig */) |
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140 { |
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141 // Can this ever cause trouble on systems that don't forget signal |
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142 // handlers when they are invoked? |
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143 |
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144 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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145 |
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146 int n = octave_child_list::length (); |
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147 |
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148 for (int i = 0; i < n; i++) |
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149 { |
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150 octave_child& elt = octave_child_list::elem (i); |
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151 |
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152 pid_t pid = elt.pid; |
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153 |
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154 if (pid > 0) |
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155 { |
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156 int status; |
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157 |
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158 if (waitpid (pid, &status, WNOHANG) > 0) |
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159 { |
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160 elt.pid = -1; |
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161 |
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162 octave_child::dead_child_handler f = elt.handler; |
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163 |
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164 if (f) |
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165 (*f) (pid, status); |
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166 |
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167 break; |
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168 } |
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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 #if defined (__alpha__) |
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174 static RETSIGTYPE |
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175 sigfpe_handler (int /* sig */) |
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176 { |
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177 // Can this ever cause trouble on systems that don't forget signal |
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178 // handlers when they are invoked? |
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179 |
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180 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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181 |
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182 error ("floating point exception -- trying to return to prompt"); |
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183 |
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184 if (can_interrupt) |
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185 { |
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186 jump_to_top_level (); |
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187 panic_impossible (); |
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188 } |
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189 |
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190 #if RETSIGTYPE == void |
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191 return; |
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192 #else |
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193 return 0; |
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194 #endif |
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195 } |
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196 #endif |
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197 |
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198 // Handle SIGINT by restarting the parser (see octave.cc). |
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199 |
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200 static RETSIGTYPE |
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201 sigint_handler (int /* sig */) |
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202 { |
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203 // Can this ever cause trouble on systems that don't forget signal |
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204 // handlers when they are invoked? |
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205 |
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206 octave_set_signal_handler (SIGINT, sigint_handler); |
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207 |
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208 if (can_interrupt) |
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209 { |
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210 jump_to_top_level (); |
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211 panic_impossible (); |
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212 } |
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213 |
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214 #if RETSIGTYPE == void |
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215 return; |
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216 #else |
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217 return 0; |
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218 #endif |
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219 } |
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220 |
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221 static RETSIGTYPE |
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222 sigpipe_handler (int /* sig */) |
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223 { |
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224 // Can this ever cause trouble on systems that don't forget signal |
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225 // handlers when they are invoked? |
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226 |
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227 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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228 |
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229 if (pipe_handler_error_count++ == 0) |
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230 warning ("broken pipe"); |
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231 |
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232 // Don't loop forever on account of this. |
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233 |
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234 if (pipe_handler_error_count > 100) |
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235 jump_to_top_level (); |
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236 |
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237 #if RETSIGTYPE == void |
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238 return; |
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239 #else |
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240 return 0; |
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241 #endif |
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242 } |
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243 |
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244 void |
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245 catch_interrupts (void) |
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246 { |
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247 octave_set_signal_handler (SIGINT, sigint_handler); |
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248 } |
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249 |
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250 // Install all the handlers for the signals we might care about. |
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251 |
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252 void |
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253 install_signal_handlers (void) |
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254 { |
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255 set_new_handler (octave_new_handler); |
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256 |
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257 #ifdef SIGABRT |
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258 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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259 #endif |
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260 |
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261 #ifdef SIGALRM |
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262 octave_set_signal_handler (SIGALRM, generic_sig_handler); |
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263 #endif |
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264 |
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265 #ifdef SIGBUS |
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266 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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267 #endif |
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268 |
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269 #ifdef SIGCHLD |
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270 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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271 #endif |
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272 |
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273 #ifdef SIGEMT |
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274 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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275 #endif |
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276 |
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277 #ifdef SIGFPE |
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278 #if defined (__alpha__) |
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279 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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280 #else |
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281 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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282 #endif |
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283 #endif |
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284 |
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285 #ifdef SIGHUP |
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286 octave_set_signal_handler (SIGHUP, generic_sig_handler); |
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287 #endif |
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288 |
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289 #ifdef SIGILL |
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290 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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291 #endif |
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292 |
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293 #ifdef SIGINT |
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294 octave_set_signal_handler (SIGINT, sigint_handler); |
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295 #endif |
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296 |
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297 #ifdef SIGIOT |
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298 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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299 #endif |
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300 |
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301 #ifdef SIGLOST |
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302 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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303 #endif |
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304 |
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305 #ifdef SIGPIPE |
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306 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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307 #endif |
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308 |
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309 #ifdef SIGPOLL |
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310 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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311 #endif |
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312 |
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313 #ifdef SIGPROF |
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314 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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315 #endif |
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316 |
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317 #ifdef SIGQUIT |
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318 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
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319 #endif |
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320 |
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321 #ifdef SIGSEGV |
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322 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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323 #endif |
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324 |
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325 #ifdef SIGSYS |
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326 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
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327 #endif |
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328 |
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329 #ifdef SIGTERM |
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330 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
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331 #endif |
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332 |
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333 #ifdef SIGTRAP |
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334 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
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335 #endif |
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336 |
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337 #ifdef SIGUSR1 |
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338 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
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339 #endif |
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340 |
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341 #ifdef SIGUSR2 |
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342 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
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343 #endif |
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344 |
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345 #ifdef SIGVTALRM |
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346 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
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347 #endif |
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348 |
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349 #ifdef SIGIO |
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350 octave_set_signal_handler (SIGIO, SIG_IGN); |
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351 #endif |
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352 |
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353 #ifdef SIGXCPU |
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354 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
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355 #endif |
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356 |
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357 #ifdef SIGXFSZ |
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358 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
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359 #endif |
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360 } |
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361 |
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362 #ifndef HAVE_SYS_SIGLIST |
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363 char *sys_siglist[NSIG + 1] = |
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364 { |
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365 #ifdef AIX |
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366 /* AIX has changed the signals a bit */ |
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367 "bogus signal", /* 0 */ |
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368 "hangup", /* 1 SIGHUP */ |
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369 "interrupt", /* 2 SIGINT */ |
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370 "quit", /* 3 SIGQUIT */ |
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371 "illegal instruction", /* 4 SIGILL */ |
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372 "trace trap", /* 5 SIGTRAP */ |
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373 "IOT instruction", /* 6 SIGIOT */ |
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374 "crash likely", /* 7 SIGDANGER */ |
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375 "floating point exception", /* 8 SIGFPE */ |
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376 "kill", /* 9 SIGKILL */ |
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377 "bus error", /* 10 SIGBUS */ |
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378 "segmentation violation", /* 11 SIGSEGV */ |
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379 "bad argument to system call", /* 12 SIGSYS */ |
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380 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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381 "alarm clock", /* 14 SIGALRM */ |
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382 "software termination signum", /* 15 SIGTERM */ |
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383 "user defined signal 1", /* 16 SIGUSR1 */ |
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384 "user defined signal 2", /* 17 SIGUSR2 */ |
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385 "death of a child", /* 18 SIGCLD */ |
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386 "power-fail restart", /* 19 SIGPWR */ |
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387 "bogus signal", /* 20 */ |
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388 "bogus signal", /* 21 */ |
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389 "bogus signal", /* 22 */ |
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390 "bogus signal", /* 23 */ |
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391 "bogus signal", /* 24 */ |
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392 "LAN I/O interrupt", /* 25 SIGAIO */ |
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393 "PTY I/O interrupt", /* 26 SIGPTY */ |
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394 "I/O intervention required", /* 27 SIGIOINT */ |
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395 "HFT grant", /* 28 SIGGRANT */ |
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396 "HFT retract", /* 29 SIGRETRACT */ |
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397 "HFT sound done", /* 30 SIGSOUND */ |
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398 "HFT input ready", /* 31 SIGMSG */ |
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399 #else /* not AIX */ |
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400 "bogus signal", /* 0 */ |
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401 "hangup", /* 1 SIGHUP */ |
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402 "interrupt", /* 2 SIGINT */ |
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403 "quit", /* 3 SIGQUIT */ |
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404 "illegal instruction", /* 4 SIGILL */ |
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405 "trace trap", /* 5 SIGTRAP */ |
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406 "IOT instruction", /* 6 SIGIOT */ |
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407 "EMT instruction", /* 7 SIGEMT */ |
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408 "floating point exception", /* 8 SIGFPE */ |
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409 "kill", /* 9 SIGKILL */ |
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410 "bus error", /* 10 SIGBUS */ |
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411 "segmentation violation", /* 11 SIGSEGV */ |
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412 "bad argument to system call", /* 12 SIGSYS */ |
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413 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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414 "alarm clock", /* 14 SIGALRM */ |
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415 "software termination signum", /* 15 SIGTERM */ |
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416 "user defined signal 1", /* 16 SIGUSR1 */ |
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417 "user defined signal 2", /* 17 SIGUSR2 */ |
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418 "death of a child", /* 18 SIGCLD */ |
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419 "power-fail restart", /* 19 SIGPWR */ |
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420 #ifdef sun |
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421 "window size change", /* 20 SIGWINCH */ |
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422 "urgent socket condition", /* 21 SIGURG */ |
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423 "pollable event occured", /* 22 SIGPOLL */ |
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424 "stop (cannot be caught or ignored)", /* 23 SIGSTOP */ |
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425 "user stop requested from tty", /* 24 SIGTSTP */ |
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426 "stopped process has been continued", /* 25 SIGCONT */ |
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427 "background tty read attempted", /* 26 SIGTTIN */ |
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428 "background tty write attempted", /* 27 SIGTTOU */ |
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429 "virtual timer expired", /* 28 SIGVTALRM */ |
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430 "profiling timer expired", /* 29 SIGPROF */ |
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431 "exceeded cpu limit", /* 30 SIGXCPU */ |
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432 "exceeded file size limit", /* 31 SIGXFSZ */ |
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433 "process's lwps are blocked", /* 32 SIGWAITING */ |
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434 "special signal used by thread library", /* 33 SIGLWP */ |
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435 #ifdef SIGFREEZE |
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436 "Special Signal Used By CPR", /* 34 SIGFREEZE */ |
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437 #endif |
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438 #ifdef SIGTHAW |
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439 "Special Signal Used By CPR", /* 35 SIGTHAW */ |
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440 #endif |
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441 #endif /* sun */ |
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442 #endif /* not AIX */ |
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443 0 |
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444 }; |
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445 #endif |
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446 |
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2209
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447 octave_child_list *octave_child_list::instance = 0; |
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448 |
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449 void |
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450 octave_child_list::do_insert (pid_t pid, octave_child::dead_child_handler f) |
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451 { |
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452 // Insert item in first open slot, increasing size of list if |
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453 // necessary. |
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454 |
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455 bool enlarge = true; |
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456 |
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457 for (int i = 0; i < curr_len; i++) |
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|
458 { |
|
2305
|
459 octave_child& tmp = list (i); |
|
2209
|
460 |
|
|
461 if (tmp.pid < 0) |
|
|
462 { |
|
2305
|
463 list (i) = octave_child (pid, f); |
|
2209
|
464 enlarge = false; |
|
|
465 break; |
|
|
466 } |
|
|
467 } |
|
|
468 |
|
|
469 if (enlarge) |
|
|
470 { |
|
|
471 int total_len = list.length (); |
|
|
472 |
|
|
473 if (curr_len == total_len) |
|
|
474 { |
|
|
475 if (total_len == 0) |
|
|
476 list.resize (16); |
|
|
477 else |
|
|
478 list.resize (total_len * 2); |
|
|
479 } |
|
|
480 |
|
2305
|
481 list (curr_len) = octave_child (pid, f); |
|
2209
|
482 curr_len++; |
|
|
483 } |
|
|
484 } |
|
|
485 |
|
|
486 void |
|
|
487 octave_child_list::insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
488 { |
|
|
489 if (! instance) |
|
|
490 instance = new octave_child_list (); |
|
|
491 |
|
|
492 if (instance) |
|
|
493 instance->do_insert (pid, f); |
|
|
494 else |
|
|
495 panic_impossible (); |
|
|
496 } |
|
|
497 |
|
2210
|
498 void |
|
|
499 octave_child_list::do_remove (pid_t pid) |
|
|
500 { |
|
|
501 // Mark the record for PID invalid. |
|
|
502 |
|
|
503 for (int i = 0; i < curr_len; i++) |
|
|
504 { |
|
2305
|
505 octave_child& tmp = list (i); |
|
2210
|
506 |
|
|
507 if (tmp.pid == pid) |
|
|
508 { |
|
|
509 tmp.pid = -1; |
|
|
510 break; |
|
|
511 } |
|
|
512 } |
|
|
513 } |
|
|
514 |
|
|
515 void |
|
|
516 octave_child_list::remove (pid_t pid) |
|
|
517 { |
|
|
518 if (! instance) |
|
|
519 instance = new octave_child_list (); |
|
|
520 |
|
|
521 if (instance) |
|
|
522 instance->do_remove (pid); |
|
|
523 else |
|
|
524 panic_impossible (); |
|
|
525 } |
|
|
526 |
|
1
|
527 /* |
|
|
528 ;;; Local Variables: *** |
|
|
529 ;;; mode: C++ *** |
|
|
530 ;;; End: *** |
|
|
531 */ |
