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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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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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1352
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42 #include "error.h" |
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1373
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43 #include "load-save.h" |
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2091
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44 #include "pager.h" |
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1
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45 #include "sighandlers.h" |
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1352
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46 #include "syswait.h" |
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2091
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47 #include "toplev.h" |
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1
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48 #include "utils.h" |
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49 |
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50 // Nonzero means we have already printed a message for this series of |
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51 // SIGPIPES. We assume that the writer will eventually give up. |
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52 int pipe_handler_error_count = 0; |
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53 |
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3018
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54 // TRUE means we can be interrupted. |
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55 bool can_interrupt = false; |
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56 |
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2469
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57 #if RETSIGTYPE == void |
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58 #define SIGHANDLER_RETURN(status) return |
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59 #else |
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60 #define SIGHANDLER_RETURN(status) return status |
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61 #endif |
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62 |
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2554
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63 #if defined (MUST_REINSTALL_SIGHANDLERS) |
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64 #define MAYBE_REINSTALL_SIGHANDLER(sig, handler) \ |
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65 octave_set_signal_handler (sig, handler) |
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66 #define REINSTALL_USES_SIG 1 |
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67 #else |
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68 #define MAYBE_REINSTALL_SIGHANDLER(sig, handler) \ |
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69 do { } while (0) |
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70 #endif |
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71 |
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72 #if defined (__EMX__) |
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73 #define MAYBE_ACK_SIGNAL(sig) \ |
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74 octave_set_signal_handler (sig, SIG_ACK) |
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75 #define ACK_USES_SIG 1 |
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76 #else |
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77 #define MAYBE_ACK_SIGNAL(sig) \ |
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78 do { } while (0) |
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79 #endif |
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80 |
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81 static void |
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82 my_friendly_exit (const char *sig_name, int sig_number) |
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83 { |
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2536
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84 static bool been_there_done_that = false; |
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85 |
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86 if (been_there_done_that) |
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87 { |
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88 #if defined (SIGABRT) |
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89 octave_set_signal_handler (SIGABRT, SIG_DFL); |
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90 #endif |
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91 |
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92 std::cerr << "panic: attempted clean up apparently failed -- aborting...\n"; |
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93 abort (); |
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94 } |
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95 else |
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96 { |
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97 been_there_done_that = true; |
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98 |
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99 std::cerr << "panic: " << sig_name << " -- stopping myself...\n"; |
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100 |
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101 save_user_variables (); |
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102 |
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103 if (sig_number < 0) |
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104 exit (1); |
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105 else |
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106 { |
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107 octave_set_signal_handler (sig_number, SIG_DFL); |
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108 |
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109 #if defined (HAVE_RAISE) |
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110 raise (sig_number); |
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111 #elif defined (HAVE_KILL) |
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112 kill (getpid (), sig_number); |
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113 #else |
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114 exit (1); |
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115 #endif |
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116 } |
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117 |
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118 } |
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119 } |
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120 |
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121 sig_handler * |
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122 octave_set_signal_handler (int sig, sig_handler *handler) |
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123 { |
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124 #if defined (HAVE_POSIX_SIGNALS) |
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125 struct sigaction act, oact; |
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126 act.sa_handler = handler; |
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127 act.sa_flags = 0; |
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128 sigemptyset (&act.sa_mask); |
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129 sigemptyset (&oact.sa_mask); |
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130 sigaction (sig, &act, &oact); |
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131 return oact.sa_handler; |
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132 #else |
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133 return signal (sig, handler); |
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134 #endif |
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135 } |
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136 |
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137 static RETSIGTYPE |
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138 generic_sig_handler (int sig) |
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139 { |
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140 my_friendly_exit (sys_siglist[sig], sig); |
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141 |
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142 SIGHANDLER_RETURN (0); |
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143 } |
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144 |
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145 // Handle SIGCHLD. |
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146 |
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147 #ifdef SIGCHLD |
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148 static RETSIGTYPE |
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149 sigchld_handler (int /* sig */) |
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150 { |
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151 volatile octave_interrupt_handler saved_interrupt_handler |
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152 = octave_ignore_interrupts (); |
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153 |
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154 // I wonder if this is really right, or if SIGCHLD should just be |
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155 // blocked on OS/2 systems the same as for systems with POSIX signal |
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156 // functions. |
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157 |
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158 #if defined (__EMX__) |
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159 volatile sig_handler *saved_sigchld_handler |
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160 = octave_set_signal_handler (SIGCHLD, SIG_IGN); |
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161 #endif |
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162 |
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2626
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163 sigset_t set, oset; |
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164 |
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165 BLOCK_CHILD (set, oset); |
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166 |
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2209
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167 int n = octave_child_list::length (); |
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168 |
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169 for (int i = 0; i < n; i++) |
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170 { |
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3252
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171 octave_child& elt = octave_child_list::elem (i); |
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172 |
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173 pid_t pid = elt.pid; |
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174 |
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3252
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175 if (pid > 0) |
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176 { |
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177 int status; |
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178 |
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179 if (waitpid (pid, &status, WNOHANG) > 0) |
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180 { |
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3252
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181 elt.pid = -1; |
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182 |
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3252
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183 octave_child::dead_child_handler f = elt.handler; |
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184 |
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3252
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185 if (f) |
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186 f (pid, status); |
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187 |
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188 break; |
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189 } |
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190 } |
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191 } |
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192 |
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193 octave_set_interrupt_handler (saved_interrupt_handler); |
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194 |
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195 UNBLOCK_CHILD (oset); |
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196 |
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197 #ifdef __EMX__ |
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198 octave_set_signal_handler (SIGCHLD, saved_sigchld_handler); |
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199 #endif |
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200 |
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201 MAYBE_ACK_SIGNAL (SIGCHLD); |
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202 |
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203 MAYBE_REINSTALL_SIGHANDLER (SIGCHLD, sigchld_handler); |
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204 |
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205 SIGHANDLER_RETURN (0); |
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206 } |
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207 #endif /* defined(SIGCHLD) */ |
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208 |
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4064
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209 #ifdef SIGFPE |
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210 #if defined (__alpha__) |
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211 static RETSIGTYPE |
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212 sigfpe_handler (int /* sig */) |
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213 { |
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214 MAYBE_ACK_SIGNAL (SIGFPE); |
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215 |
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216 MAYBE_REINSTALL_SIGHANDLER (SIGFPE, sigfpe_handler); |
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217 |
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218 std::cerr << "error: floating point exception -- trying to return to prompt\n"; |
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219 |
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220 if (can_interrupt) |
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221 { |
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4180
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222 // XXX FIXME XXX -- this may simply set the interrupt state. We |
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223 // can only hope for the best after returning? We probably need |
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224 // to throw an exception. |
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225 |
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226 OCTAVE_OCTAVE_JUMP_TO_TOP_LEVEL; |
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227 } |
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228 |
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229 SIGHANDLER_RETURN (0); |
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230 } |
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231 #endif /* defined(__alpha__) */ |
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232 #endif /* defined(SIGFPE) */ |
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233 |
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3343
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234 #if 0 |
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3281
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235 #if defined (SIGWINCH) |
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236 static RETSIGTYPE |
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237 sigwinch_handler (int /* sig */) |
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238 { |
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239 MAYBE_ACK_SIGNAL (SIGWINCH); |
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240 |
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241 MAYBE_REINSTALL_SIGHANDLER (SIGWINCH, sigwinch_handler); |
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242 |
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243 command_editor::resize_terminal (); |
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244 |
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245 SIGHANDLER_RETURN (0); |
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246 } |
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247 #endif |
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3343
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248 #endif |
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3281
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249 |
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635
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250 // Handle SIGINT by restarting the parser (see octave.cc). |
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251 // |
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252 // This also has to work for SIGBREAK (on systems that have it), so we |
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253 // use the value of sig, instead of just assuming that it is called |
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254 // for SIGINT only. |
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635
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255 |
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256 static RETSIGTYPE |
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257 #if defined (ACK_USES_SIG) || defined (REINSTALL_USES_SIG) |
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258 sigint_handler (int sig) |
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2931
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259 #else |
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260 sigint_handler (int) |
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261 #endif |
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1
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262 { |
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2626
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263 MAYBE_ACK_SIGNAL (sig); |
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264 |
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265 MAYBE_REINSTALL_SIGHANDLER (sig, sigint_handler); |
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266 |
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4172
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267 if (! octave_initialized) |
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268 exit (1); |
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269 |
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1
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270 if (can_interrupt) |
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271 { |
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272 #if defined (USE_EXCEPTIONS_FOR_INTERRUPTS) |
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273 octave_interrupt_state = 1; |
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274 |
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275 if (octave_interrupt_immediately) |
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276 octave_jump_to_enclosing_context (); |
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277 #else |
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278 OCTAVE_JUMP_TO_TOP_LEVEL; |
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1
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279 panic_impossible (); |
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4153
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280 #endif |
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1
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281 } |
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282 |
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2469
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283 SIGHANDLER_RETURN (0); |
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1
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284 } |
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285 |
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4064
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286 #ifdef SIGPIPE |
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287 static RETSIGTYPE |
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288 sigpipe_handler (int /* sig */) |
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1
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289 { |
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290 MAYBE_ACK_SIGNAL (SIGPIPE); |
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291 |
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292 MAYBE_REINSTALL_SIGHANDLER (SIGPIPE, sigpipe_handler); |
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293 |
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1
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294 if (pipe_handler_error_count++ == 0) |
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3531
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295 std::cerr << "warning: broken pipe\n"; |
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1
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296 |
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1358
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297 // Don't loop forever on account of this. |
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298 |
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1
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299 if (pipe_handler_error_count > 100) |
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4153
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300 OCTAVE_JUMP_TO_TOP_LEVEL; |
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301 |
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2469
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302 SIGHANDLER_RETURN (0); |
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1
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303 } |
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4064
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304 #endif /* defined(SIGPIPE) */ |
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305 |
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2705
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306 octave_interrupt_handler |
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2554
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307 octave_catch_interrupts (void) |
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308 { |
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2705
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309 octave_interrupt_handler retval; |
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310 |
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311 #ifdef SIGINT |
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2705
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312 retval.int_handler = octave_set_signal_handler (SIGINT, sigint_handler); |
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2554
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313 #endif |
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314 |
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315 #ifdef SIGBREAK |
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2705
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316 retval.brk_handler = octave_set_signal_handler (SIGBREAK, sigint_handler); |
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2554
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317 #endif |
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2705
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318 |
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319 return retval; |
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2554
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320 } |
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321 |
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2705
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322 octave_interrupt_handler |
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323 octave_ignore_interrupts (void) |
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2554
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324 { |
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2705
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325 octave_interrupt_handler retval; |
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326 |
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2554
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327 #ifdef SIGINT |
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2705
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328 retval.int_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
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2554
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329 #endif |
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330 |
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331 #ifdef SIGBREAK |
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2705
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332 retval.brk_handler = octave_set_signal_handler (SIGBREAK, SIG_IGN); |
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2554
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333 #endif |
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2705
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334 |
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335 return retval; |
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336 } |
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337 |
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338 octave_interrupt_handler |
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339 octave_set_interrupt_handler (const volatile octave_interrupt_handler& h) |
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340 { |
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341 octave_interrupt_handler retval; |
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342 |
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343 #ifdef SIGINT |
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344 retval.int_handler = octave_set_signal_handler (SIGINT, h.int_handler); |
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345 #endif |
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346 |
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347 #ifdef SIGBREAK |
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348 retval.brk_handler = octave_set_signal_handler (SIGBREAK, h.brk_handler); |
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349 #endif |
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350 |
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351 return retval; |
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1651
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352 } |
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353 |
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635
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354 // Install all the handlers for the signals we might care about. |
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355 |
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1
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356 void |
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357 install_signal_handlers (void) |
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358 { |
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2554
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359 octave_catch_interrupts (); |
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360 |
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1
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361 #ifdef SIGABRT |
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1446
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362 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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1
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363 #endif |
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364 |
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365 #ifdef SIGALRM |
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1446
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366 octave_set_signal_handler (SIGALRM, generic_sig_handler); |
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1
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367 #endif |
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368 |
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369 #ifdef SIGBUS |
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1446
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370 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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1
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371 #endif |
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372 |
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1230
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373 #ifdef SIGCHLD |
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1446
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374 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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1230
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375 #endif |
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376 |
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3174
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377 // SIGCLD |
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378 // SIGCONT |
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379 |
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1
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380 #ifdef SIGEMT |
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1446
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381 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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1
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382 #endif |
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383 |
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384 #ifdef SIGFPE |
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1373
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385 #if defined (__alpha__) |
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1446
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386 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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1373
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387 #else |
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1446
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388 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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1
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389 #endif |
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1373
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390 #endif |
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1
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391 |
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392 #ifdef SIGHUP |
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1446
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393 octave_set_signal_handler (SIGHUP, generic_sig_handler); |
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1
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394 #endif |
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395 |
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396 #ifdef SIGILL |
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1446
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397 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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1
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398 #endif |
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399 |
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3174
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400 // SIGINFO |
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401 // SIGINT |
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402 |
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1
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403 #ifdef SIGIOT |
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1446
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404 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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1
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405 #endif |
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406 |
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407 #ifdef SIGLOST |
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1446
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408 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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1
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409 #endif |
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410 |
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411 #ifdef SIGPIPE |
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1446
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412 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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1
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413 #endif |
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414 |
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415 #ifdef SIGPOLL |
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1446
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416 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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1
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417 #endif |
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418 |
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419 #ifdef SIGPROF |
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1446
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420 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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1
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421 #endif |
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422 |
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3174
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423 // SIGPWR |
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424 |
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1
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425 #ifdef SIGQUIT |
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1446
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426 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
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1
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427 #endif |
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428 |
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429 #ifdef SIGSEGV |
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1446
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430 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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1
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431 #endif |
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432 |
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3174
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433 // SIGSTOP |
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434 |
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1
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435 #ifdef SIGSYS |
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1446
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436 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
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1
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437 #endif |
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438 |
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439 #ifdef SIGTERM |
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1446
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440 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
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1
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441 #endif |
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442 |
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443 #ifdef SIGTRAP |
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1446
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444 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
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1
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445 #endif |
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446 |
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3174
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447 // SIGTSTP |
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448 // SIGTTIN |
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449 // SIGTTOU |
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450 // SIGURG |
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451 |
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1
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452 #ifdef SIGUSR1 |
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1446
|
453 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
|
1
|
454 #endif |
|
|
455 |
|
|
456 #ifdef SIGUSR2 |
|
1446
|
457 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
|
1
|
458 #endif |
|
|
459 |
|
|
460 #ifdef SIGVTALRM |
|
1446
|
461 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
|
1
|
462 #endif |
|
|
463 |
|
895
|
464 #ifdef SIGIO |
|
1446
|
465 octave_set_signal_handler (SIGIO, SIG_IGN); |
|
895
|
466 #endif |
|
|
467 |
|
3343
|
468 #if 0 |
|
3281
|
469 #ifdef SIGWINCH |
|
|
470 octave_set_signal_handler (SIGWINCH, sigwinch_handler); |
|
|
471 #endif |
|
3343
|
472 #endif |
|
3174
|
473 |
|
1
|
474 #ifdef SIGXCPU |
|
1446
|
475 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
|
1
|
476 #endif |
|
|
477 |
|
|
478 #ifdef SIGXFSZ |
|
1446
|
479 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
|
1
|
480 #endif |
|
|
481 } |
|
|
482 |
|
2209
|
483 octave_child_list *octave_child_list::instance = 0; |
|
|
484 |
|
2926
|
485 bool |
|
|
486 octave_child_list::instance_ok (void) |
|
|
487 { |
|
|
488 bool retval = true; |
|
|
489 |
|
|
490 if (! instance) |
|
|
491 instance = new octave_child_list (); |
|
|
492 |
|
|
493 if (! instance) |
|
|
494 { |
|
|
495 ::error ("unable to create child list object!"); |
|
|
496 |
|
|
497 retval = false; |
|
|
498 } |
|
|
499 |
|
|
500 return retval; |
|
|
501 } |
|
|
502 |
|
|
503 void |
|
|
504 octave_child_list::insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
505 { |
|
|
506 if (instance_ok ()) |
|
|
507 instance->do_insert (pid, f); |
|
|
508 } |
|
|
509 |
|
|
510 void |
|
|
511 octave_child_list::remove (pid_t pid) |
|
|
512 { |
|
|
513 if (instance_ok ()) |
|
|
514 instance->do_remove (pid); |
|
|
515 } |
|
|
516 |
|
|
517 int |
|
|
518 octave_child_list::length (void) |
|
|
519 { |
|
|
520 return (instance_ok ()) ? instance->do_length () : 0; |
|
|
521 } |
|
|
522 |
|
|
523 octave_child& |
|
|
524 octave_child_list::elem (int i) |
|
|
525 { |
|
|
526 static octave_child foo; |
|
|
527 |
|
|
528 return (instance_ok ()) ? instance->do_elem (i) : foo; |
|
|
529 } |
|
|
530 |
|
2209
|
531 void |
|
|
532 octave_child_list::do_insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
533 { |
|
|
534 // Insert item in first open slot, increasing size of list if |
|
|
535 // necessary. |
|
|
536 |
|
|
537 bool enlarge = true; |
|
|
538 |
|
|
539 for (int i = 0; i < curr_len; i++) |
|
|
540 { |
|
2305
|
541 octave_child& tmp = list (i); |
|
2209
|
542 |
|
|
543 if (tmp.pid < 0) |
|
|
544 { |
|
2305
|
545 list (i) = octave_child (pid, f); |
|
2209
|
546 enlarge = false; |
|
|
547 break; |
|
|
548 } |
|
|
549 } |
|
|
550 |
|
|
551 if (enlarge) |
|
|
552 { |
|
|
553 int total_len = list.length (); |
|
|
554 |
|
|
555 if (curr_len == total_len) |
|
|
556 { |
|
|
557 if (total_len == 0) |
|
|
558 list.resize (16); |
|
|
559 else |
|
|
560 list.resize (total_len * 2); |
|
|
561 } |
|
|
562 |
|
2305
|
563 list (curr_len) = octave_child (pid, f); |
|
2209
|
564 curr_len++; |
|
|
565 } |
|
|
566 } |
|
|
567 |
|
|
568 void |
|
2210
|
569 octave_child_list::do_remove (pid_t pid) |
|
|
570 { |
|
|
571 // Mark the record for PID invalid. |
|
|
572 |
|
|
573 for (int i = 0; i < curr_len; i++) |
|
|
574 { |
|
2305
|
575 octave_child& tmp = list (i); |
|
2210
|
576 |
|
|
577 if (tmp.pid == pid) |
|
|
578 { |
|
|
579 tmp.pid = -1; |
|
|
580 break; |
|
|
581 } |
|
|
582 } |
|
|
583 } |
|
|
584 |
|
2926
|
585 int |
|
|
586 octave_child_list::do_length (void) const |
|
|
587 { |
|
|
588 return curr_len; |
|
|
589 } |
|
|
590 |
|
|
591 octave_child& |
|
|
592 octave_child_list::do_elem (int i) |
|
2210
|
593 { |
|
2926
|
594 static octave_child foo; |
|
|
595 |
|
|
596 int n = do_length (); |
|
2210
|
597 |
|
2926
|
598 if (i >= 0 && i < n) |
|
|
599 return list (i); |
|
2210
|
600 else |
|
2926
|
601 return foo; |
|
2210
|
602 } |
|
|
603 |
|
1
|
604 /* |
|
|
605 ;;; Local Variables: *** |
|
|
606 ;;; mode: C++ *** |
|
|
607 ;;; End: *** |
|
|
608 */ |
