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