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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 << "error: attempted clean up apparently failed -- aborting...\n"; |
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126 |
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127 abort (); |
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128 } |
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129 else |
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130 { |
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131 been_there_done_that = true; |
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132 |
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133 std::cerr << "error: " << sig_name << " -- stopping myself...\n"; |
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134 |
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135 save_user_variables (); |
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136 |
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137 if (sig_number < 0) |
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138 exit (1); |
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139 else |
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140 { |
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141 octave_set_signal_handler (sig_number, SIG_DFL); |
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142 |
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143 kill (getpid (), sig_number); |
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144 } |
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145 } |
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146 } |
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147 |
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148 // I know, not really a signal handler. |
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149 |
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150 static void |
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151 octave_new_handler (void) |
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152 { |
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153 std::cerr << "error: memory exhausted -- trying to return to prompt\n"; |
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154 |
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155 if (can_interrupt) |
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156 { |
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157 jump_to_top_level (); |
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158 panic_impossible (); |
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159 } |
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160 else |
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3162
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161 my_friendly_exit ("operator new", OCTAVE_MEMORY_EXHAUSTED_ERROR); |
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162 } |
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163 |
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164 sig_handler * |
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165 octave_set_signal_handler (int sig, sig_handler *handler) |
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166 { |
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167 #if defined (HAVE_POSIX_SIGNALS) |
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168 struct sigaction act, oact; |
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169 act.sa_handler = handler; |
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170 act.sa_flags = 0; |
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171 sigemptyset (&act.sa_mask); |
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172 sigemptyset (&oact.sa_mask); |
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173 sigaction (sig, &act, &oact); |
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174 return oact.sa_handler; |
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175 #else |
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176 return signal (sig, handler); |
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177 #endif |
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178 } |
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179 |
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180 static RETSIGTYPE |
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181 generic_sig_handler (int sig) |
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182 { |
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183 my_friendly_exit (sys_siglist[sig], sig); |
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184 |
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185 SIGHANDLER_RETURN (0); |
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186 } |
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187 |
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188 // Handle SIGCHLD. |
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189 |
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190 static RETSIGTYPE |
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191 sigchld_handler (int /* sig */) |
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192 { |
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193 volatile octave_interrupt_handler saved_interrupt_handler |
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194 = octave_ignore_interrupts (); |
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195 |
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196 // I wonder if this is really right, or if SIGCHLD should just be |
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197 // blocked on OS/2 systems the same as for systems with POSIX signal |
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198 // functions. |
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199 |
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200 #if defined (__EMX__) |
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201 volatile sig_handler *saved_sigchld_handler |
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202 = octave_set_signal_handler (SIGCHLD, SIG_IGN); |
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203 #endif |
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204 |
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205 sigset_t set, oset; |
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206 |
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207 BLOCK_CHILD (set, oset); |
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208 |
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2209
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209 int n = octave_child_list::length (); |
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210 |
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211 for (int i = 0; i < n; i++) |
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212 { |
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213 octave_child& elt = octave_child_list::elem (i); |
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214 |
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215 pid_t pid = elt.pid; |
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216 |
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217 if (pid > 0) |
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218 { |
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219 int status; |
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220 |
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221 if (waitpid (pid, &status, WNOHANG) > 0) |
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222 { |
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223 elt.pid = -1; |
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224 |
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225 octave_child::dead_child_handler f = elt.handler; |
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226 |
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227 if (f) |
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228 f (pid, status); |
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229 |
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230 break; |
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231 } |
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232 } |
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233 } |
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234 |
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235 octave_set_interrupt_handler (saved_interrupt_handler); |
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236 |
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237 UNBLOCK_CHILD (oset); |
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238 |
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239 #ifdef __EMX__ |
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240 octave_set_signal_handler (SIGCHLD, saved_sigchld_handler); |
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241 #endif |
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242 |
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243 MAYBE_ACK_SIGNAL (SIGCHLD); |
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244 |
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245 MAYBE_REINSTALL_SIGHANDLER (SIGCHLD, sigchld_handler); |
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246 |
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247 SIGHANDLER_RETURN (0); |
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248 } |
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249 |
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250 #if defined (__alpha__) |
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251 static RETSIGTYPE |
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252 sigfpe_handler (int /* sig */) |
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253 { |
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254 MAYBE_ACK_SIGNAL (SIGFPE); |
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255 |
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256 MAYBE_REINSTALL_SIGHANDLER (SIGFPE, sigfpe_handler); |
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257 |
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258 std::cerr << "error: floating point exception -- trying to return to prompt\n"; |
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259 |
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260 if (can_interrupt) |
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261 { |
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262 jump_to_top_level (); |
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263 panic_impossible (); |
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264 } |
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265 |
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266 SIGHANDLER_RETURN (0); |
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267 } |
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268 #endif |
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269 |
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270 #if 0 |
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271 #if defined (SIGWINCH) |
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272 static RETSIGTYPE |
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273 sigwinch_handler (int /* sig */) |
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274 { |
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275 MAYBE_ACK_SIGNAL (SIGWINCH); |
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276 |
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277 MAYBE_REINSTALL_SIGHANDLER (SIGWINCH, sigwinch_handler); |
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278 |
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279 command_editor::resize_terminal (); |
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280 |
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281 SIGHANDLER_RETURN (0); |
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282 } |
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283 #endif |
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3343
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284 #endif |
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285 |
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286 // Handle SIGINT by restarting the parser (see octave.cc). |
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287 // |
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288 // This also has to work for SIGBREAK (on systems that have it), so we |
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289 // use the value of sig, instead of just assuming that it is called |
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290 // for SIGINT only. |
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291 |
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292 static RETSIGTYPE |
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293 #if defined (ACK_USES_SIG) || defined (REINSTALL_USES_SIG) |
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294 sigint_handler (int sig) |
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295 #else |
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296 sigint_handler (int) |
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297 #endif |
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1
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298 { |
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299 MAYBE_ACK_SIGNAL (sig); |
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300 |
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301 MAYBE_REINSTALL_SIGHANDLER (sig, sigint_handler); |
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302 |
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303 if (can_interrupt) |
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304 { |
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305 jump_to_top_level (); |
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306 panic_impossible (); |
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307 } |
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308 |
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309 SIGHANDLER_RETURN (0); |
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310 } |
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311 |
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312 static RETSIGTYPE |
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313 sigpipe_handler (int /* sig */) |
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1
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314 { |
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315 MAYBE_ACK_SIGNAL (SIGPIPE); |
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316 |
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317 MAYBE_REINSTALL_SIGHANDLER (SIGPIPE, sigpipe_handler); |
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318 |
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1
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319 if (pipe_handler_error_count++ == 0) |
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320 std::cerr << "warning: broken pipe\n"; |
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321 |
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1358
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322 // Don't loop forever on account of this. |
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323 |
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1
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324 if (pipe_handler_error_count > 100) |
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325 jump_to_top_level (); |
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326 |
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327 SIGHANDLER_RETURN (0); |
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1
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328 } |
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329 |
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2705
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330 octave_interrupt_handler |
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331 octave_catch_interrupts (void) |
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332 { |
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2705
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333 octave_interrupt_handler retval; |
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334 |
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335 #ifdef SIGINT |
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336 retval.int_handler = octave_set_signal_handler (SIGINT, sigint_handler); |
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337 #endif |
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338 |
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339 #ifdef SIGBREAK |
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340 retval.brk_handler = octave_set_signal_handler (SIGBREAK, sigint_handler); |
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341 #endif |
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2705
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342 |
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343 return retval; |
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2554
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344 } |
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345 |
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2705
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346 octave_interrupt_handler |
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347 octave_ignore_interrupts (void) |
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2554
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348 { |
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2705
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349 octave_interrupt_handler retval; |
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350 |
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351 #ifdef SIGINT |
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352 retval.int_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
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353 #endif |
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354 |
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355 #ifdef SIGBREAK |
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356 retval.brk_handler = octave_set_signal_handler (SIGBREAK, SIG_IGN); |
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2554
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357 #endif |
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358 |
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359 return retval; |
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360 } |
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361 |
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362 octave_interrupt_handler |
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363 octave_set_interrupt_handler (const volatile octave_interrupt_handler& h) |
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364 { |
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365 octave_interrupt_handler retval; |
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366 |
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367 #ifdef SIGINT |
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368 retval.int_handler = octave_set_signal_handler (SIGINT, h.int_handler); |
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369 #endif |
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370 |
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371 #ifdef SIGBREAK |
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372 retval.brk_handler = octave_set_signal_handler (SIGBREAK, h.brk_handler); |
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373 #endif |
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374 |
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375 return retval; |
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1651
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376 } |
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377 |
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635
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378 // Install all the handlers for the signals we might care about. |
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379 |
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1
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380 void |
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381 install_signal_handlers (void) |
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382 { |
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3503
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383 std::set_new_handler (octave_new_handler); |
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635
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384 |
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2554
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385 octave_catch_interrupts (); |
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386 |
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1
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387 #ifdef SIGABRT |
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1446
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388 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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1
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389 #endif |
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390 |
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391 #ifdef SIGALRM |
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1446
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392 octave_set_signal_handler (SIGALRM, generic_sig_handler); |
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1
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393 #endif |
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394 |
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395 #ifdef SIGBUS |
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1446
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396 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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1
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397 #endif |
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398 |
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1230
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399 #ifdef SIGCHLD |
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1446
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400 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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1230
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401 #endif |
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402 |
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3174
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403 // SIGCLD |
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404 // SIGCONT |
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405 |
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1
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406 #ifdef SIGEMT |
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1446
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407 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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1
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408 #endif |
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409 |
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410 #ifdef SIGFPE |
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1373
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411 #if defined (__alpha__) |
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1446
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412 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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1373
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413 #else |
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1446
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414 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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1
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415 #endif |
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1373
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416 #endif |
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1
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417 |
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418 #ifdef SIGHUP |
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1446
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419 octave_set_signal_handler (SIGHUP, 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 SIGILL |
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1446
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423 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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1
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424 #endif |
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425 |
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3174
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426 // SIGINFO |
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427 // SIGINT |
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428 |
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1
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429 #ifdef SIGIOT |
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1446
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430 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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1
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431 #endif |
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432 |
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433 #ifdef SIGLOST |
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1446
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434 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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1
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435 #endif |
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436 |
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437 #ifdef SIGPIPE |
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1446
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438 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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1
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439 #endif |
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440 |
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441 #ifdef SIGPOLL |
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1446
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442 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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1
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443 #endif |
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444 |
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445 #ifdef SIGPROF |
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1446
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446 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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1
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447 #endif |
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448 |
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3174
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449 // SIGPWR |
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450 |
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1
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451 #ifdef SIGQUIT |
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1446
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452 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
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1
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453 #endif |
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454 |
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455 #ifdef SIGSEGV |
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1446
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456 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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1
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457 #endif |
|
|
458 |
|
3174
|
459 // SIGSTOP |
|
|
460 |
|
1
|
461 #ifdef SIGSYS |
|
1446
|
462 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
|
1
|
463 #endif |
|
|
464 |
|
|
465 #ifdef SIGTERM |
|
1446
|
466 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
|
1
|
467 #endif |
|
|
468 |
|
|
469 #ifdef SIGTRAP |
|
1446
|
470 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
|
1
|
471 #endif |
|
|
472 |
|
3174
|
473 // SIGTSTP |
|
|
474 // SIGTTIN |
|
|
475 // SIGTTOU |
|
|
476 // SIGURG |
|
|
477 |
|
1
|
478 #ifdef SIGUSR1 |
|
1446
|
479 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
|
1
|
480 #endif |
|
|
481 |
|
|
482 #ifdef SIGUSR2 |
|
1446
|
483 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
|
1
|
484 #endif |
|
|
485 |
|
|
486 #ifdef SIGVTALRM |
|
1446
|
487 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
|
1
|
488 #endif |
|
|
489 |
|
895
|
490 #ifdef SIGIO |
|
1446
|
491 octave_set_signal_handler (SIGIO, SIG_IGN); |
|
895
|
492 #endif |
|
|
493 |
|
3343
|
494 #if 0 |
|
3281
|
495 #ifdef SIGWINCH |
|
|
496 octave_set_signal_handler (SIGWINCH, sigwinch_handler); |
|
|
497 #endif |
|
3343
|
498 #endif |
|
3174
|
499 |
|
1
|
500 #ifdef SIGXCPU |
|
1446
|
501 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
|
1
|
502 #endif |
|
|
503 |
|
|
504 #ifdef SIGXFSZ |
|
1446
|
505 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
|
1
|
506 #endif |
|
|
507 } |
|
|
508 |
|
2209
|
509 octave_child_list *octave_child_list::instance = 0; |
|
|
510 |
|
2926
|
511 bool |
|
|
512 octave_child_list::instance_ok (void) |
|
|
513 { |
|
|
514 bool retval = true; |
|
|
515 |
|
|
516 if (! instance) |
|
|
517 instance = new octave_child_list (); |
|
|
518 |
|
|
519 if (! instance) |
|
|
520 { |
|
|
521 ::error ("unable to create child list object!"); |
|
|
522 |
|
|
523 retval = false; |
|
|
524 } |
|
|
525 |
|
|
526 return retval; |
|
|
527 } |
|
|
528 |
|
|
529 void |
|
|
530 octave_child_list::insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
531 { |
|
|
532 if (instance_ok ()) |
|
|
533 instance->do_insert (pid, f); |
|
|
534 } |
|
|
535 |
|
|
536 void |
|
|
537 octave_child_list::remove (pid_t pid) |
|
|
538 { |
|
|
539 if (instance_ok ()) |
|
|
540 instance->do_remove (pid); |
|
|
541 } |
|
|
542 |
|
|
543 int |
|
|
544 octave_child_list::length (void) |
|
|
545 { |
|
|
546 return (instance_ok ()) ? instance->do_length () : 0; |
|
|
547 } |
|
|
548 |
|
|
549 octave_child& |
|
|
550 octave_child_list::elem (int i) |
|
|
551 { |
|
|
552 static octave_child foo; |
|
|
553 |
|
|
554 return (instance_ok ()) ? instance->do_elem (i) : foo; |
|
|
555 } |
|
|
556 |
|
2209
|
557 void |
|
|
558 octave_child_list::do_insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
559 { |
|
|
560 // Insert item in first open slot, increasing size of list if |
|
|
561 // necessary. |
|
|
562 |
|
|
563 bool enlarge = true; |
|
|
564 |
|
|
565 for (int i = 0; i < curr_len; i++) |
|
|
566 { |
|
2305
|
567 octave_child& tmp = list (i); |
|
2209
|
568 |
|
|
569 if (tmp.pid < 0) |
|
|
570 { |
|
2305
|
571 list (i) = octave_child (pid, f); |
|
2209
|
572 enlarge = false; |
|
|
573 break; |
|
|
574 } |
|
|
575 } |
|
|
576 |
|
|
577 if (enlarge) |
|
|
578 { |
|
|
579 int total_len = list.length (); |
|
|
580 |
|
|
581 if (curr_len == total_len) |
|
|
582 { |
|
|
583 if (total_len == 0) |
|
|
584 list.resize (16); |
|
|
585 else |
|
|
586 list.resize (total_len * 2); |
|
|
587 } |
|
|
588 |
|
2305
|
589 list (curr_len) = octave_child (pid, f); |
|
2209
|
590 curr_len++; |
|
|
591 } |
|
|
592 } |
|
|
593 |
|
|
594 void |
|
2210
|
595 octave_child_list::do_remove (pid_t pid) |
|
|
596 { |
|
|
597 // Mark the record for PID invalid. |
|
|
598 |
|
|
599 for (int i = 0; i < curr_len; i++) |
|
|
600 { |
|
2305
|
601 octave_child& tmp = list (i); |
|
2210
|
602 |
|
|
603 if (tmp.pid == pid) |
|
|
604 { |
|
|
605 tmp.pid = -1; |
|
|
606 break; |
|
|
607 } |
|
|
608 } |
|
|
609 } |
|
|
610 |
|
2926
|
611 int |
|
|
612 octave_child_list::do_length (void) const |
|
|
613 { |
|
|
614 return curr_len; |
|
|
615 } |
|
|
616 |
|
|
617 octave_child& |
|
|
618 octave_child_list::do_elem (int i) |
|
2210
|
619 { |
|
2926
|
620 static octave_child foo; |
|
|
621 |
|
|
622 int n = do_length (); |
|
2210
|
623 |
|
2926
|
624 if (i >= 0 && i < n) |
|
|
625 return list (i); |
|
2210
|
626 else |
|
2926
|
627 return foo; |
|
2210
|
628 } |
|
|
629 |
|
1
|
630 /* |
|
|
631 ;;; Local Variables: *** |
|
|
632 ;;; mode: C++ *** |
|
|
633 ;;; End: *** |
|
|
634 */ |
