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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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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <cstdlib> |
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28 |
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29 #include <iostream> |
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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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33 #ifdef HAVE_SYS_TYPES_H |
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34 #include <sys/types.h> |
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35 #endif |
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36 #include <unistd.h> |
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37 #endif |
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38 |
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39 #include "cmd-edit.h" |
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40 |
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1352
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41 #include "error.h" |
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1373
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42 #include "load-save.h" |
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2091
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43 #include "pager.h" |
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44 #include "sighandlers.h" |
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45 #include "syswait.h" |
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46 #include "toplev.h" |
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47 #include "utils.h" |
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48 |
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49 // Nonzero means we have already printed a message for this series of |
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50 // SIGPIPES. We assume that the writer will eventually give up. |
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51 int pipe_handler_error_count = 0; |
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52 |
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3018
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53 // TRUE means we can be interrupted. |
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54 bool can_interrupt = false; |
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55 |
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2016
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56 // Allow us to save the signal mask and then restore it to the most |
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57 // recently saved value. This is necessary when using the POSIX |
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58 // signal handling interface on some systems calling longjmp out of |
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59 // the signal handler to get to the top level on an interrupt doesn't |
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60 // restore the original signal mask. Alternatively, we could use |
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61 // sigsetjmp/siglongjmp, but saving and restoring the signal mask |
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62 // ourselves works ok and seems simpler just now. |
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63 |
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64 #if defined (HAVE_POSIX_SIGNALS) |
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65 static sigset_t octave_signal_mask; |
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66 #endif |
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67 |
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2469
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68 #if RETSIGTYPE == void |
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69 #define SIGHANDLER_RETURN(status) return |
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70 #else |
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71 #define SIGHANDLER_RETURN(status) return status |
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72 #endif |
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73 |
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74 #if defined (MUST_REINSTALL_SIGHANDLERS) |
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75 #define MAYBE_REINSTALL_SIGHANDLER(sig, handler) \ |
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76 octave_set_signal_handler (sig, handler) |
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77 #define REINSTALL_USES_SIG 1 |
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78 #else |
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79 #define MAYBE_REINSTALL_SIGHANDLER(sig, handler) \ |
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80 do { } while (0) |
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81 #endif |
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82 |
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83 #if defined (__EMX__) |
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84 #define MAYBE_ACK_SIGNAL(sig) \ |
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85 octave_set_signal_handler (sig, SIG_ACK) |
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86 #define ACK_USES_SIG 1 |
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87 #else |
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88 #define MAYBE_ACK_SIGNAL(sig) \ |
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89 do { } while (0) |
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90 #endif |
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91 |
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92 #if defined (SIGABRT) |
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93 #define OCTAVE_MEMORY_EXHAUSTED_ERROR SIGABRT |
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94 #else |
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95 #define OCTAVE_MEMORY_EXHAUSTED_ERROR (-1) |
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96 #endif |
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97 |
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98 void |
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99 octave_save_signal_mask (void) |
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100 { |
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101 #if defined (HAVE_POSIX_SIGNALS) |
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102 sigprocmask (0, 0, &octave_signal_mask); |
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103 #endif |
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104 } |
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105 |
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106 void |
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107 octave_restore_signal_mask (void) |
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108 { |
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109 #if defined (HAVE_POSIX_SIGNALS) |
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110 sigprocmask (SIG_SETMASK, &octave_signal_mask, 0); |
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111 #endif |
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112 } |
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113 |
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114 static void |
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115 my_friendly_exit (const char *sig_name, int sig_number) |
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116 { |
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117 static bool been_there_done_that = false; |
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118 |
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119 if (been_there_done_that) |
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120 { |
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121 #if defined (SIGABRT) |
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122 octave_set_signal_handler (SIGABRT, SIG_DFL); |
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123 #endif |
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124 |
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125 std::cerr << "panic: attempted clean up apparently failed -- aborting...\n"; |
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126 abort (); |
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127 } |
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128 else |
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129 { |
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130 been_there_done_that = true; |
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131 |
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132 std::cerr << "panic: " << sig_name << " -- stopping myself...\n"; |
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133 |
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134 save_user_variables (); |
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135 |
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136 if (sig_number < 0) |
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137 exit (1); |
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138 else |
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139 { |
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140 octave_set_signal_handler (sig_number, SIG_DFL); |
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141 |
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142 #if defined (HAVE_RAISE) |
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143 raise (sig_number); |
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144 #elif defined (HAVE_KILL) |
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145 kill (getpid (), sig_number); |
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146 #else |
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147 exit (1); |
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148 #endif |
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149 } |
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150 |
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151 } |
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152 } |
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153 |
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154 // I know, not really a signal handler. |
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155 |
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156 static void |
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157 octave_new_handler (void) |
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158 { |
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159 std::cerr << "error: memory exhausted -- trying to return to prompt\n"; |
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160 |
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161 if (can_interrupt) |
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162 { |
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163 jump_to_top_level (); |
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164 panic_impossible (); |
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165 } |
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166 else |
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167 my_friendly_exit ("operator new", OCTAVE_MEMORY_EXHAUSTED_ERROR); |
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168 } |
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169 |
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170 sig_handler * |
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171 octave_set_signal_handler (int sig, sig_handler *handler) |
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172 { |
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173 #if defined (HAVE_POSIX_SIGNALS) |
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174 struct sigaction act, oact; |
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175 act.sa_handler = handler; |
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176 act.sa_flags = 0; |
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177 sigemptyset (&act.sa_mask); |
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178 sigemptyset (&oact.sa_mask); |
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179 sigaction (sig, &act, &oact); |
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180 return oact.sa_handler; |
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181 #else |
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182 return signal (sig, handler); |
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183 #endif |
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184 } |
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185 |
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186 static RETSIGTYPE |
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187 generic_sig_handler (int sig) |
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188 { |
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189 my_friendly_exit (sys_siglist[sig], sig); |
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190 |
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191 SIGHANDLER_RETURN (0); |
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192 } |
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193 |
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194 // Handle SIGCHLD. |
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195 |
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196 #ifdef SIGCHLD |
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197 static RETSIGTYPE |
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198 sigchld_handler (int /* sig */) |
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199 { |
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200 volatile octave_interrupt_handler saved_interrupt_handler |
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201 = octave_ignore_interrupts (); |
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202 |
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203 // I wonder if this is really right, or if SIGCHLD should just be |
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204 // blocked on OS/2 systems the same as for systems with POSIX signal |
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205 // functions. |
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206 |
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207 #if defined (__EMX__) |
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208 volatile sig_handler *saved_sigchld_handler |
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209 = octave_set_signal_handler (SIGCHLD, SIG_IGN); |
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210 #endif |
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211 |
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212 sigset_t set, oset; |
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213 |
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214 BLOCK_CHILD (set, oset); |
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215 |
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216 int n = octave_child_list::length (); |
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217 |
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218 for (int i = 0; i < n; i++) |
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219 { |
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220 octave_child& elt = octave_child_list::elem (i); |
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221 |
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222 pid_t pid = elt.pid; |
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223 |
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224 if (pid > 0) |
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225 { |
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226 int status; |
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227 |
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228 if (waitpid (pid, &status, WNOHANG) > 0) |
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229 { |
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230 elt.pid = -1; |
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231 |
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232 octave_child::dead_child_handler f = elt.handler; |
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233 |
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234 if (f) |
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235 f (pid, status); |
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236 |
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237 break; |
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238 } |
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239 } |
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240 } |
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241 |
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242 octave_set_interrupt_handler (saved_interrupt_handler); |
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243 |
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244 UNBLOCK_CHILD (oset); |
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245 |
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246 #ifdef __EMX__ |
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247 octave_set_signal_handler (SIGCHLD, saved_sigchld_handler); |
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248 #endif |
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249 |
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250 MAYBE_ACK_SIGNAL (SIGCHLD); |
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251 |
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252 MAYBE_REINSTALL_SIGHANDLER (SIGCHLD, sigchld_handler); |
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253 |
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254 SIGHANDLER_RETURN (0); |
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255 } |
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256 #endif /* defined(SIGCHLD) */ |
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257 |
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258 #ifdef SIGFPE |
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259 #if defined (__alpha__) |
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260 static RETSIGTYPE |
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261 sigfpe_handler (int /* sig */) |
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262 { |
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263 MAYBE_ACK_SIGNAL (SIGFPE); |
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264 |
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265 MAYBE_REINSTALL_SIGHANDLER (SIGFPE, sigfpe_handler); |
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266 |
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267 std::cerr << "error: floating point exception -- trying to return to prompt\n"; |
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268 |
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269 if (can_interrupt) |
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270 { |
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271 jump_to_top_level (); |
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272 panic_impossible (); |
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273 } |
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274 |
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275 SIGHANDLER_RETURN (0); |
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276 } |
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277 #endif /* defined(__alpha__) */ |
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278 #endif /* defined(SIGFPE) */ |
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279 |
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280 #if 0 |
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281 #if defined (SIGWINCH) |
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282 static RETSIGTYPE |
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283 sigwinch_handler (int /* sig */) |
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284 { |
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285 MAYBE_ACK_SIGNAL (SIGWINCH); |
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286 |
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287 MAYBE_REINSTALL_SIGHANDLER (SIGWINCH, sigwinch_handler); |
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288 |
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289 command_editor::resize_terminal (); |
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290 |
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291 SIGHANDLER_RETURN (0); |
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292 } |
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293 #endif |
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3343
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294 #endif |
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295 |
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635
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296 // Handle SIGINT by restarting the parser (see octave.cc). |
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297 // |
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298 // This also has to work for SIGBREAK (on systems that have it), so we |
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299 // use the value of sig, instead of just assuming that it is called |
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300 // for SIGINT only. |
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301 |
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302 static RETSIGTYPE |
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303 #if defined (ACK_USES_SIG) || defined (REINSTALL_USES_SIG) |
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304 sigint_handler (int sig) |
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2931
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305 #else |
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306 sigint_handler (int) |
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307 #endif |
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1
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308 { |
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309 MAYBE_ACK_SIGNAL (sig); |
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310 |
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311 MAYBE_REINSTALL_SIGHANDLER (sig, sigint_handler); |
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312 |
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1
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313 if (can_interrupt) |
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314 { |
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315 jump_to_top_level (); |
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316 panic_impossible (); |
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317 } |
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318 |
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319 SIGHANDLER_RETURN (0); |
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1
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320 } |
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321 |
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4064
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322 #ifdef SIGPIPE |
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1
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323 static RETSIGTYPE |
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324 sigpipe_handler (int /* sig */) |
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325 { |
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326 MAYBE_ACK_SIGNAL (SIGPIPE); |
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327 |
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328 MAYBE_REINSTALL_SIGHANDLER (SIGPIPE, sigpipe_handler); |
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329 |
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1
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330 if (pipe_handler_error_count++ == 0) |
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3531
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331 std::cerr << "warning: broken pipe\n"; |
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1
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332 |
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1358
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333 // Don't loop forever on account of this. |
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334 |
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1
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335 if (pipe_handler_error_count > 100) |
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336 jump_to_top_level (); |
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337 |
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2469
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338 SIGHANDLER_RETURN (0); |
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1
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339 } |
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4064
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340 #endif /* defined(SIGPIPE) */ |
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341 |
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2705
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342 octave_interrupt_handler |
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343 octave_catch_interrupts (void) |
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344 { |
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2705
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345 octave_interrupt_handler retval; |
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346 |
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347 #ifdef SIGINT |
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348 retval.int_handler = octave_set_signal_handler (SIGINT, sigint_handler); |
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2554
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349 #endif |
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350 |
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351 #ifdef SIGBREAK |
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352 retval.brk_handler = octave_set_signal_handler (SIGBREAK, sigint_handler); |
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353 #endif |
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2705
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354 |
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355 return retval; |
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2554
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356 } |
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357 |
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2705
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358 octave_interrupt_handler |
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359 octave_ignore_interrupts (void) |
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2554
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360 { |
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2705
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361 octave_interrupt_handler retval; |
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362 |
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2554
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363 #ifdef SIGINT |
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2705
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364 retval.int_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
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2554
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365 #endif |
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366 |
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367 #ifdef SIGBREAK |
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368 retval.brk_handler = octave_set_signal_handler (SIGBREAK, SIG_IGN); |
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2554
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369 #endif |
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2705
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370 |
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371 return retval; |
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372 } |
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373 |
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374 octave_interrupt_handler |
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375 octave_set_interrupt_handler (const volatile octave_interrupt_handler& h) |
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376 { |
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377 octave_interrupt_handler retval; |
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378 |
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379 #ifdef SIGINT |
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380 retval.int_handler = octave_set_signal_handler (SIGINT, h.int_handler); |
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381 #endif |
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382 |
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383 #ifdef SIGBREAK |
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384 retval.brk_handler = octave_set_signal_handler (SIGBREAK, h.brk_handler); |
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385 #endif |
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386 |
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387 return retval; |
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1651
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388 } |
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389 |
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635
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390 // Install all the handlers for the signals we might care about. |
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391 |
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1
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392 void |
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393 install_signal_handlers (void) |
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394 { |
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3503
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395 std::set_new_handler (octave_new_handler); |
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635
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396 |
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2554
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397 octave_catch_interrupts (); |
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398 |
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1
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399 #ifdef SIGABRT |
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1446
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400 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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1
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401 #endif |
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402 |
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403 #ifdef SIGALRM |
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1446
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404 octave_set_signal_handler (SIGALRM, 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 SIGBUS |
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1446
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408 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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1
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409 #endif |
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410 |
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1230
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411 #ifdef SIGCHLD |
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1446
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412 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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1230
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413 #endif |
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414 |
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3174
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415 // SIGCLD |
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416 // SIGCONT |
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417 |
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1
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418 #ifdef SIGEMT |
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1446
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419 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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1
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420 #endif |
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421 |
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422 #ifdef SIGFPE |
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1373
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423 #if defined (__alpha__) |
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1446
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424 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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1373
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425 #else |
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1446
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426 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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1
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427 #endif |
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1373
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428 #endif |
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1
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429 |
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430 #ifdef SIGHUP |
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1446
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431 octave_set_signal_handler (SIGHUP, generic_sig_handler); |
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1
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432 #endif |
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433 |
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434 #ifdef SIGILL |
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1446
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435 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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1
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436 #endif |
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437 |
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3174
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438 // SIGINFO |
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439 // SIGINT |
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440 |
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1
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441 #ifdef SIGIOT |
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1446
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442 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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1
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443 #endif |
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444 |
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445 #ifdef SIGLOST |
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1446
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446 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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1
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447 #endif |
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448 |
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449 #ifdef SIGPIPE |
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1446
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450 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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1
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451 #endif |
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452 |
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453 #ifdef SIGPOLL |
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1446
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454 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
|
1
|
455 #endif |
|
|
456 |
|
|
457 #ifdef SIGPROF |
|
1446
|
458 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
|
1
|
459 #endif |
|
|
460 |
|
3174
|
461 // SIGPWR |
|
|
462 |
|
1
|
463 #ifdef SIGQUIT |
|
1446
|
464 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
|
1
|
465 #endif |
|
|
466 |
|
|
467 #ifdef SIGSEGV |
|
1446
|
468 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
|
1
|
469 #endif |
|
|
470 |
|
3174
|
471 // SIGSTOP |
|
|
472 |
|
1
|
473 #ifdef SIGSYS |
|
1446
|
474 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
|
1
|
475 #endif |
|
|
476 |
|
|
477 #ifdef SIGTERM |
|
1446
|
478 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
|
1
|
479 #endif |
|
|
480 |
|
|
481 #ifdef SIGTRAP |
|
1446
|
482 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
|
1
|
483 #endif |
|
|
484 |
|
3174
|
485 // SIGTSTP |
|
|
486 // SIGTTIN |
|
|
487 // SIGTTOU |
|
|
488 // SIGURG |
|
|
489 |
|
1
|
490 #ifdef SIGUSR1 |
|
1446
|
491 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
|
1
|
492 #endif |
|
|
493 |
|
|
494 #ifdef SIGUSR2 |
|
1446
|
495 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
|
1
|
496 #endif |
|
|
497 |
|
|
498 #ifdef SIGVTALRM |
|
1446
|
499 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
|
1
|
500 #endif |
|
|
501 |
|
895
|
502 #ifdef SIGIO |
|
1446
|
503 octave_set_signal_handler (SIGIO, SIG_IGN); |
|
895
|
504 #endif |
|
|
505 |
|
3343
|
506 #if 0 |
|
3281
|
507 #ifdef SIGWINCH |
|
|
508 octave_set_signal_handler (SIGWINCH, sigwinch_handler); |
|
|
509 #endif |
|
3343
|
510 #endif |
|
3174
|
511 |
|
1
|
512 #ifdef SIGXCPU |
|
1446
|
513 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
|
1
|
514 #endif |
|
|
515 |
|
|
516 #ifdef SIGXFSZ |
|
1446
|
517 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
|
1
|
518 #endif |
|
|
519 } |
|
|
520 |
|
2209
|
521 octave_child_list *octave_child_list::instance = 0; |
|
|
522 |
|
2926
|
523 bool |
|
|
524 octave_child_list::instance_ok (void) |
|
|
525 { |
|
|
526 bool retval = true; |
|
|
527 |
|
|
528 if (! instance) |
|
|
529 instance = new octave_child_list (); |
|
|
530 |
|
|
531 if (! instance) |
|
|
532 { |
|
|
533 ::error ("unable to create child list object!"); |
|
|
534 |
|
|
535 retval = false; |
|
|
536 } |
|
|
537 |
|
|
538 return retval; |
|
|
539 } |
|
|
540 |
|
|
541 void |
|
|
542 octave_child_list::insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
543 { |
|
|
544 if (instance_ok ()) |
|
|
545 instance->do_insert (pid, f); |
|
|
546 } |
|
|
547 |
|
|
548 void |
|
|
549 octave_child_list::remove (pid_t pid) |
|
|
550 { |
|
|
551 if (instance_ok ()) |
|
|
552 instance->do_remove (pid); |
|
|
553 } |
|
|
554 |
|
|
555 int |
|
|
556 octave_child_list::length (void) |
|
|
557 { |
|
|
558 return (instance_ok ()) ? instance->do_length () : 0; |
|
|
559 } |
|
|
560 |
|
|
561 octave_child& |
|
|
562 octave_child_list::elem (int i) |
|
|
563 { |
|
|
564 static octave_child foo; |
|
|
565 |
|
|
566 return (instance_ok ()) ? instance->do_elem (i) : foo; |
|
|
567 } |
|
|
568 |
|
2209
|
569 void |
|
|
570 octave_child_list::do_insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
571 { |
|
|
572 // Insert item in first open slot, increasing size of list if |
|
|
573 // necessary. |
|
|
574 |
|
|
575 bool enlarge = true; |
|
|
576 |
|
|
577 for (int i = 0; i < curr_len; i++) |
|
|
578 { |
|
2305
|
579 octave_child& tmp = list (i); |
|
2209
|
580 |
|
|
581 if (tmp.pid < 0) |
|
|
582 { |
|
2305
|
583 list (i) = octave_child (pid, f); |
|
2209
|
584 enlarge = false; |
|
|
585 break; |
|
|
586 } |
|
|
587 } |
|
|
588 |
|
|
589 if (enlarge) |
|
|
590 { |
|
|
591 int total_len = list.length (); |
|
|
592 |
|
|
593 if (curr_len == total_len) |
|
|
594 { |
|
|
595 if (total_len == 0) |
|
|
596 list.resize (16); |
|
|
597 else |
|
|
598 list.resize (total_len * 2); |
|
|
599 } |
|
|
600 |
|
2305
|
601 list (curr_len) = octave_child (pid, f); |
|
2209
|
602 curr_len++; |
|
|
603 } |
|
|
604 } |
|
|
605 |
|
|
606 void |
|
2210
|
607 octave_child_list::do_remove (pid_t pid) |
|
|
608 { |
|
|
609 // Mark the record for PID invalid. |
|
|
610 |
|
|
611 for (int i = 0; i < curr_len; i++) |
|
|
612 { |
|
2305
|
613 octave_child& tmp = list (i); |
|
2210
|
614 |
|
|
615 if (tmp.pid == pid) |
|
|
616 { |
|
|
617 tmp.pid = -1; |
|
|
618 break; |
|
|
619 } |
|
|
620 } |
|
|
621 } |
|
|
622 |
|
2926
|
623 int |
|
|
624 octave_child_list::do_length (void) const |
|
|
625 { |
|
|
626 return curr_len; |
|
|
627 } |
|
|
628 |
|
|
629 octave_child& |
|
|
630 octave_child_list::do_elem (int i) |
|
2210
|
631 { |
|
2926
|
632 static octave_child foo; |
|
|
633 |
|
|
634 int n = do_length (); |
|
2210
|
635 |
|
2926
|
636 if (i >= 0 && i < n) |
|
|
637 return list (i); |
|
2210
|
638 else |
|
2926
|
639 return foo; |
|
2210
|
640 } |
|
|
641 |
|
1
|
642 /* |
|
|
643 ;;; Local Variables: *** |
|
|
644 ;;; mode: C++ *** |
|
|
645 ;;; End: *** |
|
|
646 */ |
