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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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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1230
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24 #include <config.h> |
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1
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25 #endif |
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26 |
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2536
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27 #include <cstdlib> |
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28 |
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3503
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29 #include <iostream> |
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1344
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30 #include <new> |
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31 |
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1350
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32 #ifdef HAVE_UNISTD_H |
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2442
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33 #ifdef HAVE_SYS_TYPES_H |
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834
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34 #include <sys/types.h> |
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2442
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35 #endif |
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834
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36 #include <unistd.h> |
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37 #endif |
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1343
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38 |
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3281
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39 #include "cmd-edit.h" |
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4153
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40 #include "quit.h" |
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3281
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41 |
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4185
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42 #include "defun.h" |
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1352
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43 #include "error.h" |
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1373
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44 #include "load-save.h" |
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2091
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45 #include "pager.h" |
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4185
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46 #include "pt-bp.h" |
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1
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47 #include "sighandlers.h" |
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1352
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48 #include "syswait.h" |
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2091
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49 #include "toplev.h" |
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1
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50 #include "utils.h" |
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51 |
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52 // Nonzero means we have already printed a message for this series of |
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53 // SIGPIPES. We assume that the writer will eventually give up. |
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54 int pipe_handler_error_count = 0; |
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55 |
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3018
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56 // TRUE means we can be interrupted. |
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57 bool can_interrupt = false; |
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1
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58 |
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4185
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59 // TRUE means we should try to enter the debugger on SIGINT. |
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60 static bool Vdebug_on_interrupt = false; |
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61 |
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2469
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62 #if RETSIGTYPE == void |
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63 #define SIGHANDLER_RETURN(status) return |
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64 #else |
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65 #define SIGHANDLER_RETURN(status) return status |
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66 #endif |
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67 |
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2554
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68 #if defined (MUST_REINSTALL_SIGHANDLERS) |
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69 #define MAYBE_REINSTALL_SIGHANDLER(sig, handler) \ |
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70 octave_set_signal_handler (sig, handler) |
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2931
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71 #define REINSTALL_USES_SIG 1 |
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2554
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72 #else |
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73 #define MAYBE_REINSTALL_SIGHANDLER(sig, handler) \ |
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74 do { } while (0) |
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75 #endif |
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76 |
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77 #if defined (__EMX__) |
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2626
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78 #define MAYBE_ACK_SIGNAL(sig) \ |
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79 octave_set_signal_handler (sig, SIG_ACK) |
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80 #define ACK_USES_SIG 1 |
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2554
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81 #else |
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82 #define MAYBE_ACK_SIGNAL(sig) \ |
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83 do { } while (0) |
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84 #endif |
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85 |
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86 static void |
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87 my_friendly_exit (const char *sig_name, int sig_number) |
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88 { |
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2536
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89 static bool been_there_done_that = false; |
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90 |
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91 if (been_there_done_that) |
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92 { |
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93 #if defined (SIGABRT) |
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94 octave_set_signal_handler (SIGABRT, SIG_DFL); |
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95 #endif |
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96 |
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97 std::cerr << "panic: attempted clean up apparently failed -- aborting...\n"; |
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98 abort (); |
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99 } |
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100 else |
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101 { |
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102 been_there_done_that = true; |
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103 |
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104 std::cerr << "panic: " << sig_name << " -- stopping myself...\n"; |
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105 |
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106 save_user_variables (); |
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107 |
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3162
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108 if (sig_number < 0) |
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109 exit (1); |
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110 else |
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111 { |
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112 octave_set_signal_handler (sig_number, SIG_DFL); |
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113 |
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4092
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114 #if defined (HAVE_RAISE) |
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115 raise (sig_number); |
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116 #elif defined (HAVE_KILL) |
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117 kill (getpid (), sig_number); |
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4092
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118 #else |
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119 exit (1); |
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120 #endif |
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3162
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121 } |
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122 |
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123 } |
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1
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124 } |
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125 |
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126 sig_handler * |
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127 octave_set_signal_handler (int sig, sig_handler *handler) |
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128 { |
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129 #if defined (HAVE_POSIX_SIGNALS) |
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130 struct sigaction act, oact; |
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131 act.sa_handler = handler; |
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132 act.sa_flags = 0; |
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133 sigemptyset (&act.sa_mask); |
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134 sigemptyset (&oact.sa_mask); |
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135 sigaction (sig, &act, &oact); |
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136 return oact.sa_handler; |
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137 #else |
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138 return signal (sig, handler); |
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139 #endif |
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140 } |
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141 |
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142 static RETSIGTYPE |
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143 generic_sig_handler (int sig) |
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144 { |
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1446
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145 my_friendly_exit (sys_siglist[sig], sig); |
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146 |
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2469
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147 SIGHANDLER_RETURN (0); |
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148 } |
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149 |
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150 // Handle SIGCHLD. |
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151 |
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152 #ifdef SIGCHLD |
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153 static RETSIGTYPE |
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154 sigchld_handler (int /* sig */) |
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155 { |
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156 volatile octave_interrupt_handler saved_interrupt_handler |
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157 = octave_ignore_interrupts (); |
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158 |
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2626
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159 // I wonder if this is really right, or if SIGCHLD should just be |
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160 // blocked on OS/2 systems the same as for systems with POSIX signal |
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161 // functions. |
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162 |
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163 #if defined (__EMX__) |
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164 volatile sig_handler *saved_sigchld_handler |
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165 = octave_set_signal_handler (SIGCHLD, SIG_IGN); |
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166 #endif |
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167 |
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2626
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168 sigset_t set, oset; |
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169 |
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170 BLOCK_CHILD (set, oset); |
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171 |
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2209
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172 int n = octave_child_list::length (); |
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173 |
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3252
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174 for (int i = 0; i < n; i++) |
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175 { |
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3252
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176 octave_child& elt = octave_child_list::elem (i); |
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177 |
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178 pid_t pid = elt.pid; |
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2209
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179 |
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3252
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180 if (pid > 0) |
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181 { |
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182 int status; |
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2209
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183 |
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3252
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184 if (waitpid (pid, &status, WNOHANG) > 0) |
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185 { |
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3252
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186 elt.pid = -1; |
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187 |
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3252
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188 octave_child::dead_child_handler f = elt.handler; |
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189 |
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3252
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190 if (f) |
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191 f (pid, status); |
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192 |
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3252
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193 break; |
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194 } |
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195 } |
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196 } |
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197 |
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198 octave_set_interrupt_handler (saved_interrupt_handler); |
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199 |
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2626
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200 UNBLOCK_CHILD (oset); |
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201 |
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202 #ifdef __EMX__ |
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203 octave_set_signal_handler (SIGCHLD, saved_sigchld_handler); |
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2475
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204 #endif |
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205 |
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2626
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206 MAYBE_ACK_SIGNAL (SIGCHLD); |
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207 |
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208 MAYBE_REINSTALL_SIGHANDLER (SIGCHLD, sigchld_handler); |
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209 |
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210 SIGHANDLER_RETURN (0); |
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211 } |
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4064
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212 #endif /* defined(SIGCHLD) */ |
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213 |
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4064
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214 #ifdef SIGFPE |
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215 #if defined (__alpha__) |
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216 static RETSIGTYPE |
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217 sigfpe_handler (int /* sig */) |
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218 { |
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219 MAYBE_ACK_SIGNAL (SIGFPE); |
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220 |
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221 MAYBE_REINSTALL_SIGHANDLER (SIGFPE, sigfpe_handler); |
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222 |
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3531
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223 std::cerr << "error: floating point exception -- trying to return to prompt\n"; |
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224 |
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4182
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225 // XXX FIXME XXX -- will setting octave_interrupt_state really help |
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226 // here? |
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227 |
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1373
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228 if (can_interrupt) |
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4182
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229 octave_interrupt_state = 1; |
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230 |
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231 SIGHANDLER_RETURN (0); |
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1373
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232 } |
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4064
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233 #endif /* defined(__alpha__) */ |
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234 #endif /* defined(SIGFPE) */ |
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235 |
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3343
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236 #if 0 |
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3281
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237 #if defined (SIGWINCH) |
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238 static RETSIGTYPE |
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239 sigwinch_handler (int /* sig */) |
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240 { |
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241 MAYBE_ACK_SIGNAL (SIGWINCH); |
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242 |
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243 MAYBE_REINSTALL_SIGHANDLER (SIGWINCH, sigwinch_handler); |
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244 |
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245 command_editor::resize_terminal (); |
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246 |
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247 SIGHANDLER_RETURN (0); |
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248 } |
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249 #endif |
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3343
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250 #endif |
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3281
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251 |
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635
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252 // Handle SIGINT by restarting the parser (see octave.cc). |
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2554
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253 // |
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254 // This also has to work for SIGBREAK (on systems that have it), so we |
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255 // use the value of sig, instead of just assuming that it is called |
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256 // for SIGINT only. |
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635
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257 |
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1
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258 static RETSIGTYPE |
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2931
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259 #if defined (ACK_USES_SIG) || defined (REINSTALL_USES_SIG) |
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260 sigint_handler (int sig) |
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2931
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261 #else |
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262 sigint_handler (int) |
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263 #endif |
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1
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264 { |
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2626
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265 MAYBE_ACK_SIGNAL (sig); |
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2554
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266 |
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267 MAYBE_REINSTALL_SIGHANDLER (sig, sigint_handler); |
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834
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268 |
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4172
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269 if (! octave_initialized) |
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270 exit (1); |
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271 |
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1
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272 if (can_interrupt) |
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273 { |
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4185
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274 if (Vdebug_on_interrupt) |
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275 { |
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276 if (! octave_debug_on_interrupt_state) |
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277 { |
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278 octave_debug_on_interrupt_state = true; |
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279 |
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280 SIGHANDLER_RETURN (0); |
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281 } |
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282 else |
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283 // Clear the flag and do normal interrupt stuff. |
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284 octave_debug_on_interrupt_state = false; |
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285 } |
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286 |
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4153
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287 octave_interrupt_state = 1; |
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288 |
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289 if (octave_interrupt_immediately) |
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290 octave_jump_to_enclosing_context (); |
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1
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291 } |
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292 |
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2469
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293 SIGHANDLER_RETURN (0); |
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1
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294 } |
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295 |
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4064
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296 #ifdef SIGPIPE |
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1
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297 static RETSIGTYPE |
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1488
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298 sigpipe_handler (int /* sig */) |
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1
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299 { |
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2626
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300 MAYBE_ACK_SIGNAL (SIGPIPE); |
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2554
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301 |
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302 MAYBE_REINSTALL_SIGHANDLER (SIGPIPE, sigpipe_handler); |
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834
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303 |
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1
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304 if (pipe_handler_error_count++ == 0) |
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3531
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305 std::cerr << "warning: broken pipe\n"; |
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1
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306 |
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1358
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307 // Don't loop forever on account of this. |
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308 |
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4182
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309 // XXX FIXME XXX -- will setting octave_interrupt_state really help |
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310 // here? |
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311 |
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1
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312 if (pipe_handler_error_count > 100) |
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4182
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313 octave_interrupt_state = 1; |
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1
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314 |
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2469
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315 SIGHANDLER_RETURN (0); |
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1
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316 } |
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4064
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317 #endif /* defined(SIGPIPE) */ |
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1
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318 |
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2705
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319 octave_interrupt_handler |
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2554
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320 octave_catch_interrupts (void) |
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321 { |
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2705
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322 octave_interrupt_handler retval; |
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2554
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323 |
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324 #ifdef SIGINT |
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2705
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325 retval.int_handler = octave_set_signal_handler (SIGINT, sigint_handler); |
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2554
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326 #endif |
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327 |
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328 #ifdef SIGBREAK |
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2705
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329 retval.brk_handler = octave_set_signal_handler (SIGBREAK, sigint_handler); |
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2554
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330 #endif |
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2705
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331 |
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332 return retval; |
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2554
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333 } |
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334 |
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2705
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335 octave_interrupt_handler |
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336 octave_ignore_interrupts (void) |
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2554
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337 { |
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2705
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338 octave_interrupt_handler retval; |
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339 |
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2554
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340 #ifdef SIGINT |
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2705
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341 retval.int_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
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2554
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342 #endif |
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343 |
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344 #ifdef SIGBREAK |
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2705
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345 retval.brk_handler = octave_set_signal_handler (SIGBREAK, SIG_IGN); |
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2554
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346 #endif |
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2705
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347 |
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348 return retval; |
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349 } |
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350 |
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351 octave_interrupt_handler |
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352 octave_set_interrupt_handler (const volatile octave_interrupt_handler& h) |
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353 { |
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354 octave_interrupt_handler retval; |
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355 |
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356 #ifdef SIGINT |
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357 retval.int_handler = octave_set_signal_handler (SIGINT, h.int_handler); |
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358 #endif |
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359 |
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360 #ifdef SIGBREAK |
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361 retval.brk_handler = octave_set_signal_handler (SIGBREAK, h.brk_handler); |
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362 #endif |
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363 |
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364 return retval; |
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1651
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365 } |
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366 |
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635
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367 // Install all the handlers for the signals we might care about. |
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368 |
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1
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369 void |
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370 install_signal_handlers (void) |
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371 { |
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2554
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372 octave_catch_interrupts (); |
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373 |
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1
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374 #ifdef SIGABRT |
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1446
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375 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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1
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376 #endif |
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377 |
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378 #ifdef SIGALRM |
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1446
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379 octave_set_signal_handler (SIGALRM, generic_sig_handler); |
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1
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380 #endif |
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381 |
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382 #ifdef SIGBUS |
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1446
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383 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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1
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384 #endif |
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385 |
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1230
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386 #ifdef SIGCHLD |
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1446
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387 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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1230
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388 #endif |
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389 |
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3174
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390 // SIGCLD |
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391 // SIGCONT |
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392 |
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1
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393 #ifdef SIGEMT |
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1446
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394 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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1
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395 #endif |
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396 |
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397 #ifdef SIGFPE |
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1373
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398 #if defined (__alpha__) |
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1446
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399 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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1373
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400 #else |
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1446
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401 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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1
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402 #endif |
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1373
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403 #endif |
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1
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404 |
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405 #ifdef SIGHUP |
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1446
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406 octave_set_signal_handler (SIGHUP, generic_sig_handler); |
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1
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407 #endif |
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408 |
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409 #ifdef SIGILL |
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1446
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410 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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1
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411 #endif |
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412 |
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3174
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413 // SIGINFO |
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414 // SIGINT |
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415 |
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1
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416 #ifdef SIGIOT |
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1446
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417 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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1
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418 #endif |
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419 |
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420 #ifdef SIGLOST |
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1446
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421 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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1
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422 #endif |
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423 |
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424 #ifdef SIGPIPE |
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1446
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425 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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1
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426 #endif |
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427 |
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428 #ifdef SIGPOLL |
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1446
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429 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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1
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430 #endif |
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431 |
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432 #ifdef SIGPROF |
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1446
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433 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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1
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434 #endif |
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435 |
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3174
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436 // SIGPWR |
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437 |
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1
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438 #ifdef SIGQUIT |
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1446
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439 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
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1
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440 #endif |
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441 |
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442 #ifdef SIGSEGV |
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1446
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443 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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1
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444 #endif |
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445 |
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3174
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446 // SIGSTOP |
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447 |
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1
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448 #ifdef SIGSYS |
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1446
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449 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
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1
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450 #endif |
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451 |
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452 #ifdef SIGTERM |
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1446
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453 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
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1
|
454 #endif |
|
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455 |
|
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456 #ifdef SIGTRAP |
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1446
|
457 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
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1
|
458 #endif |
|
|
459 |
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3174
|
460 // SIGTSTP |
|
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461 // SIGTTIN |
|
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462 // SIGTTOU |
|
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463 // SIGURG |
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464 |
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1
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465 #ifdef SIGUSR1 |
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1446
|
466 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
|
1
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467 #endif |
|
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468 |
|
|
469 #ifdef SIGUSR2 |
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1446
|
470 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
|
1
|
471 #endif |
|
|
472 |
|
|
473 #ifdef SIGVTALRM |
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1446
|
474 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
|
1
|
475 #endif |
|
|
476 |
|
895
|
477 #ifdef SIGIO |
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1446
|
478 octave_set_signal_handler (SIGIO, SIG_IGN); |
|
895
|
479 #endif |
|
|
480 |
|
3343
|
481 #if 0 |
|
3281
|
482 #ifdef SIGWINCH |
|
|
483 octave_set_signal_handler (SIGWINCH, sigwinch_handler); |
|
|
484 #endif |
|
3343
|
485 #endif |
|
3174
|
486 |
|
1
|
487 #ifdef SIGXCPU |
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1446
|
488 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
|
1
|
489 #endif |
|
|
490 |
|
|
491 #ifdef SIGXFSZ |
|
1446
|
492 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
|
1
|
493 #endif |
|
|
494 } |
|
|
495 |
|
2209
|
496 octave_child_list *octave_child_list::instance = 0; |
|
|
497 |
|
2926
|
498 bool |
|
|
499 octave_child_list::instance_ok (void) |
|
|
500 { |
|
|
501 bool retval = true; |
|
|
502 |
|
|
503 if (! instance) |
|
|
504 instance = new octave_child_list (); |
|
|
505 |
|
|
506 if (! instance) |
|
|
507 { |
|
|
508 ::error ("unable to create child list object!"); |
|
|
509 |
|
|
510 retval = false; |
|
|
511 } |
|
|
512 |
|
|
513 return retval; |
|
|
514 } |
|
|
515 |
|
|
516 void |
|
|
517 octave_child_list::insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
518 { |
|
|
519 if (instance_ok ()) |
|
|
520 instance->do_insert (pid, f); |
|
|
521 } |
|
|
522 |
|
|
523 void |
|
|
524 octave_child_list::remove (pid_t pid) |
|
|
525 { |
|
|
526 if (instance_ok ()) |
|
|
527 instance->do_remove (pid); |
|
|
528 } |
|
|
529 |
|
|
530 int |
|
|
531 octave_child_list::length (void) |
|
|
532 { |
|
|
533 return (instance_ok ()) ? instance->do_length () : 0; |
|
|
534 } |
|
|
535 |
|
|
536 octave_child& |
|
|
537 octave_child_list::elem (int i) |
|
|
538 { |
|
|
539 static octave_child foo; |
|
|
540 |
|
|
541 return (instance_ok ()) ? instance->do_elem (i) : foo; |
|
|
542 } |
|
|
543 |
|
2209
|
544 void |
|
|
545 octave_child_list::do_insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
546 { |
|
|
547 // Insert item in first open slot, increasing size of list if |
|
|
548 // necessary. |
|
|
549 |
|
|
550 bool enlarge = true; |
|
|
551 |
|
|
552 for (int i = 0; i < curr_len; i++) |
|
|
553 { |
|
2305
|
554 octave_child& tmp = list (i); |
|
2209
|
555 |
|
|
556 if (tmp.pid < 0) |
|
|
557 { |
|
2305
|
558 list (i) = octave_child (pid, f); |
|
2209
|
559 enlarge = false; |
|
|
560 break; |
|
|
561 } |
|
|
562 } |
|
|
563 |
|
|
564 if (enlarge) |
|
|
565 { |
|
|
566 int total_len = list.length (); |
|
|
567 |
|
|
568 if (curr_len == total_len) |
|
|
569 { |
|
|
570 if (total_len == 0) |
|
|
571 list.resize (16); |
|
|
572 else |
|
|
573 list.resize (total_len * 2); |
|
|
574 } |
|
|
575 |
|
2305
|
576 list (curr_len) = octave_child (pid, f); |
|
2209
|
577 curr_len++; |
|
|
578 } |
|
|
579 } |
|
|
580 |
|
|
581 void |
|
2210
|
582 octave_child_list::do_remove (pid_t pid) |
|
|
583 { |
|
|
584 // Mark the record for PID invalid. |
|
|
585 |
|
|
586 for (int i = 0; i < curr_len; i++) |
|
|
587 { |
|
2305
|
588 octave_child& tmp = list (i); |
|
2210
|
589 |
|
|
590 if (tmp.pid == pid) |
|
|
591 { |
|
|
592 tmp.pid = -1; |
|
|
593 break; |
|
|
594 } |
|
|
595 } |
|
|
596 } |
|
|
597 |
|
2926
|
598 int |
|
|
599 octave_child_list::do_length (void) const |
|
|
600 { |
|
|
601 return curr_len; |
|
|
602 } |
|
|
603 |
|
|
604 octave_child& |
|
|
605 octave_child_list::do_elem (int i) |
|
2210
|
606 { |
|
2926
|
607 static octave_child foo; |
|
|
608 |
|
|
609 int n = do_length (); |
|
2210
|
610 |
|
2926
|
611 if (i >= 0 && i < n) |
|
|
612 return list (i); |
|
2210
|
613 else |
|
2926
|
614 return foo; |
|
2210
|
615 } |
|
|
616 |
|
4185
|
617 static int |
|
|
618 debug_on_interrupt (void) |
|
|
619 { |
|
|
620 Vdebug_on_interrupt = check_preference ("debug_on_interrupt"); |
|
|
621 |
|
|
622 return 0; |
|
|
623 } |
|
|
624 |
|
|
625 void |
|
|
626 symbols_of_sighandlers (void) |
|
|
627 { |
|
4233
|
628 DEFVAR (debug_on_interrupt, false, debug_on_interrupt, |
|
4185
|
629 "-*- texinfo -*-\n\ |
|
|
630 @defvr {Built-in Variable} debug_on_interrupt\n\ |
|
|
631 If @code{debug_on_interrupt} is nonzero, Octave will try to enter\n\ |
|
|
632 debugging mode when it receives an interrupt signal (typically\n\ |
|
|
633 generated with @kbd{C-c}). If a second interrupt signal is received\n\ |
|
|
634 before reaching the debugging mode, a normal interrupt will occur.\n\ |
|
|
635 The default value is 0.\n\ |
|
|
636 @end defvr"); |
|
|
637 } |
|
|
638 |
|
1
|
639 /* |
|
|
640 ;;; Local Variables: *** |
|
|
641 ;;; mode: C++ *** |
|
|
642 ;;; End: *** |
|
|
643 */ |
