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1 /* |
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2 |
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3 Copyright (C) 1996 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 #include <csignal> |
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29 |
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30 #include <new> |
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31 |
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32 #include <iostream.h> |
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33 |
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34 #ifdef HAVE_UNISTD_H |
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35 #ifdef HAVE_SYS_TYPES_H |
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36 #include <sys/types.h> |
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37 #endif |
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38 #include <unistd.h> |
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39 #endif |
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40 |
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41 #include "error.h" |
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42 #include "load-save.h" |
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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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53 // Nonzero means we can be interrupted. |
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54 int can_interrupt = 0; |
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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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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 #else |
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78 #define MAYBE_REINSTALL_SIGHANDLER(sig, handler) \ |
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79 do { } while (0) |
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80 #endif |
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81 |
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82 #if defined (__EMX__) |
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83 #define MAYBE_ACK_SIGNAL(sig) \ |
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84 octave_set_signal_handler (sig, SIG_ACK) |
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85 #else |
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86 #define MAYBE_ACK_SIGNAL(sig) \ |
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87 do { } while (0) |
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88 #endif |
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89 |
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90 void |
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91 octave_save_signal_mask (void) |
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92 { |
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93 #if defined (HAVE_POSIX_SIGNALS) |
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94 sigprocmask (0, 0, &octave_signal_mask); |
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95 #endif |
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96 } |
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97 |
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98 void |
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99 octave_restore_signal_mask (void) |
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100 { |
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101 #if defined (HAVE_POSIX_SIGNALS) |
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102 sigprocmask (SIG_SETMASK, &octave_signal_mask, 0); |
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103 #endif |
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104 } |
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105 |
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106 static void |
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107 my_friendly_exit (const char *sig_name, int sig_number) |
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108 { |
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109 static bool been_there_done_that = false; |
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110 |
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111 if (been_there_done_that) |
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112 { |
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113 #if defined (SIGABRT) |
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114 octave_set_signal_handler (SIGABRT, SIG_DFL); |
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115 #endif |
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116 |
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117 error ("attempted clean up seems to have failed -- aborting..."); |
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118 |
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119 abort (); |
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120 } |
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121 else |
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122 { |
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123 been_there_done_that = true; |
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124 |
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125 error ("%s -- stopping myself...", sig_name); |
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126 |
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127 save_user_variables (); |
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128 |
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129 clean_up_and_exit (sig_number); |
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130 } |
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131 } |
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132 |
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133 // I know, not really a signal handler. |
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134 |
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135 static void |
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136 octave_new_handler (void) |
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137 { |
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138 error ("memory exhausted -- trying to return to prompt"); |
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139 |
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140 if (can_interrupt) |
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141 { |
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142 jump_to_top_level (); |
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143 panic_impossible (); |
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144 } |
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145 else |
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146 my_friendly_exit ("operator new", 1); |
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635
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147 } |
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148 |
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149 sig_handler * |
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150 octave_set_signal_handler (int sig, sig_handler *handler) |
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151 { |
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152 #if defined (HAVE_POSIX_SIGNALS) |
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153 struct sigaction act, oact; |
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154 act.sa_handler = handler; |
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155 act.sa_flags = 0; |
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156 sigemptyset (&act.sa_mask); |
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157 sigemptyset (&oact.sa_mask); |
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158 sigaction (sig, &act, &oact); |
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159 return oact.sa_handler; |
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160 #else |
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161 return signal (sig, handler); |
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162 #endif |
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163 } |
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164 |
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165 static RETSIGTYPE |
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166 generic_sig_handler (int sig) |
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167 { |
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168 my_friendly_exit (sys_siglist[sig], sig); |
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169 |
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170 SIGHANDLER_RETURN (0); |
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171 } |
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172 |
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173 // Handle SIGCHLD. |
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174 |
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175 static RETSIGTYPE |
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176 sigchld_handler (int /* sig */) |
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177 { |
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178 volatile octave_interrupt_handler saved_interrupt_handler |
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179 = octave_ignore_interrupts (); |
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180 |
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181 // I wonder if this is really right, or if SIGCHLD should just be |
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182 // blocked on OS/2 systems the same as for systems with POSIX signal |
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183 // functions. |
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184 |
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185 #if defined (__EMX__) |
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186 volatile sig_handler *saved_sigchld_handler |
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187 = octave_set_signal_handler (SIGCHLD, SIG_IGN); |
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188 #endif |
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189 |
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190 sigset_t set, oset; |
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191 |
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192 BLOCK_CHILD (set, oset); |
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193 |
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194 int n = octave_child_list::length (); |
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195 |
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196 if (n == 0) |
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197 { |
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198 waitpid (-1, 0, WNOHANG); |
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199 } |
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200 else |
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201 { |
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202 for (int i = 0; i < n; i++) |
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203 { |
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204 octave_child& elt = octave_child_list::elem (i); |
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205 |
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206 pid_t pid = elt.pid; |
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207 |
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208 if (pid > 0) |
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209 { |
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210 int status; |
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211 |
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212 if (waitpid (pid, &status, WNOHANG) > 0) |
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213 { |
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214 elt.pid = -1; |
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215 |
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216 octave_child::dead_child_handler f = elt.handler; |
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217 |
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218 if (f) |
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219 f (pid, status); |
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220 |
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221 break; |
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222 } |
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223 } |
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224 } |
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225 } |
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226 |
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227 octave_set_interrupt_handler (saved_interrupt_handler); |
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228 |
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229 UNBLOCK_CHILD (oset); |
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230 |
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231 #ifdef __EMX__ |
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232 octave_set_signal_handler (SIGCHLD, saved_sigchld_handler); |
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233 #endif |
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234 |
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235 MAYBE_ACK_SIGNAL (SIGCHLD); |
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236 |
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237 MAYBE_REINSTALL_SIGHANDLER (SIGCHLD, sigchld_handler); |
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238 |
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239 SIGHANDLER_RETURN (0); |
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240 } |
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241 |
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242 #if defined (__alpha__) |
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243 static RETSIGTYPE |
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244 sigfpe_handler (int /* sig */) |
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245 { |
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246 MAYBE_ACK_SIGNAL (SIGFPE); |
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247 |
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248 MAYBE_REINSTALL_SIGHANDLER (SIGFPE, sigfpe_handler); |
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249 |
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250 error ("floating point exception -- trying to return to prompt"); |
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251 |
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252 if (can_interrupt) |
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253 { |
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254 jump_to_top_level (); |
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255 panic_impossible (); |
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256 } |
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257 |
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258 SIGHANDLER_RETURN (0); |
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259 } |
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260 #endif |
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261 |
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262 // Handle SIGINT by restarting the parser (see octave.cc). |
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263 // |
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264 // This also has to work for SIGBREAK (on systems that have it), so we |
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265 // use the value of sig, instead of just assuming that it is called |
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266 // for SIGINT only. |
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267 |
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268 static RETSIGTYPE |
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269 sigint_handler (int sig) |
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270 { |
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271 MAYBE_ACK_SIGNAL (sig); |
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272 |
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273 MAYBE_REINSTALL_SIGHANDLER (sig, sigint_handler); |
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274 |
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275 if (can_interrupt) |
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276 { |
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277 jump_to_top_level (); |
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278 panic_impossible (); |
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279 } |
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280 |
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281 SIGHANDLER_RETURN (0); |
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282 } |
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283 |
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284 static RETSIGTYPE |
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285 sigpipe_handler (int /* sig */) |
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286 { |
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287 MAYBE_ACK_SIGNAL (SIGPIPE); |
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288 |
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289 MAYBE_REINSTALL_SIGHANDLER (SIGPIPE, sigpipe_handler); |
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290 |
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291 if (pipe_handler_error_count++ == 0) |
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292 warning ("broken pipe"); |
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293 |
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294 // Don't loop forever on account of this. |
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295 |
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296 if (pipe_handler_error_count > 100) |
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297 jump_to_top_level (); |
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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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302 octave_interrupt_handler |
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303 octave_catch_interrupts (void) |
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304 { |
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305 octave_interrupt_handler retval; |
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306 |
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307 #ifdef SIGINT |
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308 retval.int_handler = octave_set_signal_handler (SIGINT, sigint_handler); |
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309 #endif |
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310 |
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311 #ifdef SIGBREAK |
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312 retval.brk_handler = octave_set_signal_handler (SIGBREAK, sigint_handler); |
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313 #endif |
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314 |
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315 return retval; |
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316 } |
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317 |
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318 octave_interrupt_handler |
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319 octave_ignore_interrupts (void) |
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320 { |
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321 octave_interrupt_handler retval; |
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322 |
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323 #ifdef SIGINT |
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324 retval.int_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
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325 #endif |
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326 |
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327 #ifdef SIGBREAK |
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328 retval.brk_handler = octave_set_signal_handler (SIGBREAK, SIG_IGN); |
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329 #endif |
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330 |
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331 return retval; |
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332 } |
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333 |
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334 octave_interrupt_handler |
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335 octave_set_interrupt_handler (const volatile octave_interrupt_handler& h) |
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336 { |
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337 octave_interrupt_handler retval; |
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338 |
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339 #ifdef SIGINT |
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340 retval.int_handler = octave_set_signal_handler (SIGINT, h.int_handler); |
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341 #endif |
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342 |
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343 #ifdef SIGBREAK |
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344 retval.brk_handler = octave_set_signal_handler (SIGBREAK, h.brk_handler); |
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345 #endif |
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346 |
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347 return retval; |
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348 } |
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349 |
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635
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350 // Install all the handlers for the signals we might care about. |
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351 |
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352 void |
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353 install_signal_handlers (void) |
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354 { |
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635
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355 set_new_handler (octave_new_handler); |
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356 |
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357 octave_catch_interrupts (); |
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358 |
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359 #ifdef SIGABRT |
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360 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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1
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361 #endif |
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362 |
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363 #ifdef SIGALRM |
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364 octave_set_signal_handler (SIGALRM, generic_sig_handler); |
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1
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365 #endif |
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366 |
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367 #ifdef SIGBUS |
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368 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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369 #endif |
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370 |
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371 #ifdef SIGCHLD |
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372 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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373 #endif |
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374 |
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1
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375 #ifdef SIGEMT |
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376 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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1
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377 #endif |
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378 |
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379 #ifdef SIGFPE |
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380 #if defined (__alpha__) |
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381 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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382 #else |
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383 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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1
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384 #endif |
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1373
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385 #endif |
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1
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386 |
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387 #ifdef SIGHUP |
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388 octave_set_signal_handler (SIGHUP, 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 SIGILL |
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1446
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392 octave_set_signal_handler (SIGILL, 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 SIGIOT |
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1446
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396 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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1
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397 #endif |
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398 |
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399 #ifdef SIGLOST |
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1446
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400 octave_set_signal_handler (SIGLOST, 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 SIGPIPE |
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1446
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404 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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1
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405 #endif |
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406 |
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407 #ifdef SIGPOLL |
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1446
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408 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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1
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409 #endif |
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410 |
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411 #ifdef SIGPROF |
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1446
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412 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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1
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413 #endif |
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414 |
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415 #ifdef SIGQUIT |
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1446
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416 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
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1
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417 #endif |
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418 |
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419 #ifdef SIGSEGV |
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1446
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420 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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1
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421 #endif |
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422 |
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423 #ifdef SIGSYS |
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1446
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424 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
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1
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425 #endif |
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426 |
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427 #ifdef SIGTERM |
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1446
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428 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
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1
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429 #endif |
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430 |
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431 #ifdef SIGTRAP |
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1446
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432 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
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1
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433 #endif |
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434 |
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435 #ifdef SIGUSR1 |
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1446
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436 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
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1
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437 #endif |
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438 |
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439 #ifdef SIGUSR2 |
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1446
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440 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
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1
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441 #endif |
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442 |
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443 #ifdef SIGVTALRM |
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1446
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444 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
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1
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445 #endif |
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446 |
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895
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447 #ifdef SIGIO |
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1446
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448 octave_set_signal_handler (SIGIO, SIG_IGN); |
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895
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449 #endif |
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450 |
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1
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451 #ifdef SIGXCPU |
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1446
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452 octave_set_signal_handler (SIGXCPU, 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 SIGXFSZ |
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1446
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456 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
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1
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457 #endif |
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458 } |
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459 |
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886
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460 #ifndef HAVE_SYS_SIGLIST |
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839
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461 char *sys_siglist[NSIG + 1] = |
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462 { |
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463 #ifdef AIX |
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464 /* AIX has changed the signals a bit */ |
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465 "bogus signal", /* 0 */ |
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466 "hangup", /* 1 SIGHUP */ |
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467 "interrupt", /* 2 SIGINT */ |
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468 "quit", /* 3 SIGQUIT */ |
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469 "illegal instruction", /* 4 SIGILL */ |
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470 "trace trap", /* 5 SIGTRAP */ |
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471 "IOT instruction", /* 6 SIGIOT */ |
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472 "crash likely", /* 7 SIGDANGER */ |
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473 "floating point exception", /* 8 SIGFPE */ |
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474 "kill", /* 9 SIGKILL */ |
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475 "bus error", /* 10 SIGBUS */ |
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476 "segmentation violation", /* 11 SIGSEGV */ |
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477 "bad argument to system call", /* 12 SIGSYS */ |
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478 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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479 "alarm clock", /* 14 SIGALRM */ |
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480 "software termination signum", /* 15 SIGTERM */ |
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481 "user defined signal 1", /* 16 SIGUSR1 */ |
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482 "user defined signal 2", /* 17 SIGUSR2 */ |
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483 "death of a child", /* 18 SIGCLD */ |
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484 "power-fail restart", /* 19 SIGPWR */ |
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485 "bogus signal", /* 20 */ |
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486 "bogus signal", /* 21 */ |
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487 "bogus signal", /* 22 */ |
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488 "bogus signal", /* 23 */ |
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489 "bogus signal", /* 24 */ |
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490 "LAN I/O interrupt", /* 25 SIGAIO */ |
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491 "PTY I/O interrupt", /* 26 SIGPTY */ |
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492 "I/O intervention required", /* 27 SIGIOINT */ |
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493 "HFT grant", /* 28 SIGGRANT */ |
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494 "HFT retract", /* 29 SIGRETRACT */ |
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495 "HFT sound done", /* 30 SIGSOUND */ |
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496 "HFT input ready", /* 31 SIGMSG */ |
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497 #else /* not AIX */ |
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2512
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498 #ifdef __EMX__ |
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499 "bogus signal #0", /* 0 */ |
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500 "hangup", /* 1 SIGHUP */ |
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501 "interrupt (Ctrl-C)", /* 2 SIGINT (Ctrl-C) */ |
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502 "quit", /* 3 SIGQUIT */ |
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503 "illegal instruction", /* 4 SIGILL */ |
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504 "single step", /* 5 SIGTRAP */ |
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505 "abort", /* 6 SIGABRT */ |
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506 "EMT instruction", /* 7 SIGEMT */ |
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507 "floating point exception", /* 8 SIGFPE */ |
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508 "kill", /* 9 SIGKILL */ |
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509 "bus error", /* 10 SIGBUS */ |
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510 "segmentation violation", /* 11 SIGSEGV */ |
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511 "bad argument to system call", /* 12 SIGSYS */ |
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512 "broken pipe", /* 13 SIGPIPE */ |
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513 "alarm clock", /* 14 SIGALRM */ |
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514 "software termination signum", /* 15 SIGTERM */ |
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515 "user defined signal 1", /* 16 SIGUSR1 */ |
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516 "user defined signal 2", /* 17 SIGUSR2 */ |
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517 "death of a child", /* 18 SIGCHLD */ |
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518 "bogus signal #20", /* 19 */ |
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519 "bogus signal #21", /* 20 */ |
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520 "break (Ctrl-Break)", /* 21 SIGBREAK */ |
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521 #else /* not __EMX__ */ |
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839
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522 "bogus signal", /* 0 */ |
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523 "hangup", /* 1 SIGHUP */ |
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524 "interrupt", /* 2 SIGINT */ |
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525 "quit", /* 3 SIGQUIT */ |
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526 "illegal instruction", /* 4 SIGILL */ |
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527 "trace trap", /* 5 SIGTRAP */ |
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528 "IOT instruction", /* 6 SIGIOT */ |
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529 "EMT instruction", /* 7 SIGEMT */ |
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530 "floating point exception", /* 8 SIGFPE */ |
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531 "kill", /* 9 SIGKILL */ |
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532 "bus error", /* 10 SIGBUS */ |
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533 "segmentation violation", /* 11 SIGSEGV */ |
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534 "bad argument to system call", /* 12 SIGSYS */ |
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535 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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536 "alarm clock", /* 14 SIGALRM */ |
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537 "software termination signum", /* 15 SIGTERM */ |
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538 "user defined signal 1", /* 16 SIGUSR1 */ |
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539 "user defined signal 2", /* 17 SIGUSR2 */ |
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540 "death of a child", /* 18 SIGCLD */ |
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541 "power-fail restart", /* 19 SIGPWR */ |
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542 #ifdef sun |
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543 "window size change", /* 20 SIGWINCH */ |
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544 "urgent socket condition", /* 21 SIGURG */ |
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545 "pollable event occured", /* 22 SIGPOLL */ |
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546 "stop (cannot be caught or ignored)", /* 23 SIGSTOP */ |
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547 "user stop requested from tty", /* 24 SIGTSTP */ |
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548 "stopped process has been continued", /* 25 SIGCONT */ |
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549 "background tty read attempted", /* 26 SIGTTIN */ |
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550 "background tty write attempted", /* 27 SIGTTOU */ |
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551 "virtual timer expired", /* 28 SIGVTALRM */ |
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552 "profiling timer expired", /* 29 SIGPROF */ |
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553 "exceeded cpu limit", /* 30 SIGXCPU */ |
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554 "exceeded file size limit", /* 31 SIGXFSZ */ |
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555 "process's lwps are blocked", /* 32 SIGWAITING */ |
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556 "special signal used by thread library", /* 33 SIGLWP */ |
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557 #ifdef SIGFREEZE |
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558 "Special Signal Used By CPR", /* 34 SIGFREEZE */ |
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559 #endif |
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560 #ifdef SIGTHAW |
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561 "Special Signal Used By CPR", /* 35 SIGTHAW */ |
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562 #endif |
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563 #endif /* sun */ |
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2512
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564 #endif /* __EMX__ */ |
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565 #endif /* AIX */ |
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839
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566 0 |
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567 }; |
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568 #endif |
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569 |
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2209
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570 octave_child_list *octave_child_list::instance = 0; |
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571 |
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572 void |
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573 octave_child_list::do_insert (pid_t pid, octave_child::dead_child_handler f) |
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574 { |
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575 // Insert item in first open slot, increasing size of list if |
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576 // necessary. |
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577 |
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578 bool enlarge = true; |
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579 |
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580 for (int i = 0; i < curr_len; i++) |
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581 { |
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2305
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582 octave_child& tmp = list (i); |
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2209
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583 |
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584 if (tmp.pid < 0) |
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585 { |
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2305
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586 list (i) = octave_child (pid, f); |
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2209
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587 enlarge = false; |
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588 break; |
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589 } |
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590 } |
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591 |
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592 if (enlarge) |
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593 { |
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594 int total_len = list.length (); |
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595 |
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596 if (curr_len == total_len) |
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597 { |
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598 if (total_len == 0) |
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599 list.resize (16); |
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600 else |
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601 list.resize (total_len * 2); |
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602 } |
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603 |
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2305
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604 list (curr_len) = octave_child (pid, f); |
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2209
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605 curr_len++; |
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606 } |
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607 } |
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608 |
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609 void |
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610 octave_child_list::insert (pid_t pid, octave_child::dead_child_handler f) |
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611 { |
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612 if (! instance) |
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613 instance = new octave_child_list (); |
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614 |
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615 if (instance) |
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616 instance->do_insert (pid, f); |
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617 else |
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618 panic_impossible (); |
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619 } |
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620 |
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2210
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621 void |
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622 octave_child_list::do_remove (pid_t pid) |
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623 { |
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624 // Mark the record for PID invalid. |
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625 |
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626 for (int i = 0; i < curr_len; i++) |
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627 { |
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2305
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628 octave_child& tmp = list (i); |
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2210
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629 |
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630 if (tmp.pid == pid) |
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631 { |
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632 tmp.pid = -1; |
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633 break; |
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634 } |
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635 } |
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636 } |
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637 |
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638 void |
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639 octave_child_list::remove (pid_t pid) |
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640 { |
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641 if (! instance) |
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642 instance = new octave_child_list (); |
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643 |
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644 if (instance) |
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645 instance->do_remove (pid); |
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646 else |
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647 panic_impossible (); |
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648 } |
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649 |
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1
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650 /* |
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651 ;;; Local Variables: *** |
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652 ;;; mode: C++ *** |
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653 ;;; End: *** |
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654 */ |
