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