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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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2536
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27 #include <cstdlib> |
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1343
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28 #include <csignal> |
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2536
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29 |
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1344
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30 #include <new> |
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31 |
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1350
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32 #include <iostream.h> |
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33 |
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34 #ifdef HAVE_UNISTD_H |
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2442
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35 #ifdef HAVE_SYS_TYPES_H |
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834
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36 #include <sys/types.h> |
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2442
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37 #endif |
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834
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38 #include <unistd.h> |
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39 #endif |
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1343
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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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1
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44 #include "sighandlers.h" |
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1352
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45 #include "syswait.h" |
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2091
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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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2554
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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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3162
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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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2536
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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 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 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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3162
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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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635
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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 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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635
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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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3252
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211 for (int i = 0; i < n; i++) |
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212 { |
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3252
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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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2209
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216 |
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3252
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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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3252
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225 octave_child::dead_child_handler f = elt.handler; |
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226 |
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3252
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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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1230
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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 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 // Handle SIGINT by restarting the parser (see octave.cc). |
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271 // |
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272 // This also has to work for SIGBREAK (on systems that have it), so we |
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273 // use the value of sig, instead of just assuming that it is called |
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274 // for SIGINT only. |
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635
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275 |
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276 static RETSIGTYPE |
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277 #if defined (ACK_USES_SIG) || defined (REINSTALL_USES_SIG) |
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278 sigint_handler (int sig) |
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2931
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279 #else |
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280 sigint_handler (int) |
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281 #endif |
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1
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282 { |
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283 MAYBE_ACK_SIGNAL (sig); |
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284 |
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285 MAYBE_REINSTALL_SIGHANDLER (sig, sigint_handler); |
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286 |
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287 if (can_interrupt) |
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288 { |
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289 jump_to_top_level (); |
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290 panic_impossible (); |
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291 } |
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292 |
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2469
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293 SIGHANDLER_RETURN (0); |
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1
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294 } |
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295 |
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296 static RETSIGTYPE |
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297 sigpipe_handler (int /* sig */) |
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1
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298 { |
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2626
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299 MAYBE_ACK_SIGNAL (SIGPIPE); |
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300 |
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301 MAYBE_REINSTALL_SIGHANDLER (SIGPIPE, sigpipe_handler); |
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302 |
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1
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303 if (pipe_handler_error_count++ == 0) |
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2795
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304 cerr << "warning: broken pipe\n"; |
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1
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305 |
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1358
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306 // Don't loop forever on account of this. |
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307 |
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1
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308 if (pipe_handler_error_count > 100) |
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309 jump_to_top_level (); |
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310 |
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2469
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311 SIGHANDLER_RETURN (0); |
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1
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312 } |
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313 |
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2705
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314 octave_interrupt_handler |
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2554
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315 octave_catch_interrupts (void) |
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316 { |
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2705
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317 octave_interrupt_handler retval; |
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318 |
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319 #ifdef SIGINT |
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320 retval.int_handler = octave_set_signal_handler (SIGINT, sigint_handler); |
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2554
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321 #endif |
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322 |
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323 #ifdef SIGBREAK |
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2705
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324 retval.brk_handler = octave_set_signal_handler (SIGBREAK, sigint_handler); |
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2554
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325 #endif |
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2705
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326 |
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327 return retval; |
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2554
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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_ignore_interrupts (void) |
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2554
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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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2554
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335 #ifdef SIGINT |
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2705
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336 retval.int_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
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2554
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337 #endif |
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338 |
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339 #ifdef SIGBREAK |
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2705
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340 retval.brk_handler = octave_set_signal_handler (SIGBREAK, SIG_IGN); |
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2554
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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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344 } |
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345 |
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346 octave_interrupt_handler |
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347 octave_set_interrupt_handler (const volatile octave_interrupt_handler& h) |
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348 { |
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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, h.int_handler); |
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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, h.brk_handler); |
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357 #endif |
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358 |
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359 return retval; |
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1651
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360 } |
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361 |
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635
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362 // Install all the handlers for the signals we might care about. |
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363 |
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1
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364 void |
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365 install_signal_handlers (void) |
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366 { |
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635
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367 set_new_handler (octave_new_handler); |
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368 |
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2554
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369 octave_catch_interrupts (); |
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370 |
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1
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371 #ifdef SIGABRT |
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1446
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372 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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1
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373 #endif |
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374 |
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375 #ifdef SIGALRM |
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1446
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376 octave_set_signal_handler (SIGALRM, 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 SIGBUS |
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1446
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380 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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1
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381 #endif |
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382 |
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1230
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383 #ifdef SIGCHLD |
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1446
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384 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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1230
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385 #endif |
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386 |
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3174
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387 // SIGCLD |
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388 // SIGCONT |
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389 |
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1
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390 #ifdef SIGEMT |
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1446
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391 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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1
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392 #endif |
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393 |
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394 #ifdef SIGFPE |
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1373
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395 #if defined (__alpha__) |
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1446
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396 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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1373
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397 #else |
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1446
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398 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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1
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399 #endif |
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1373
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400 #endif |
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1
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401 |
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402 #ifdef SIGHUP |
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1446
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403 octave_set_signal_handler (SIGHUP, generic_sig_handler); |
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1
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404 #endif |
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405 |
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406 #ifdef SIGILL |
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1446
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407 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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1
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408 #endif |
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409 |
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3174
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410 // SIGINFO |
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411 // SIGINT |
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412 |
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1
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413 #ifdef SIGIOT |
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1446
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414 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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1
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415 #endif |
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416 |
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417 #ifdef SIGLOST |
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1446
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418 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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1
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419 #endif |
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420 |
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421 #ifdef SIGPIPE |
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1446
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422 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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1
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423 #endif |
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424 |
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425 #ifdef SIGPOLL |
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1446
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426 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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1
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427 #endif |
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428 |
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429 #ifdef SIGPROF |
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1446
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430 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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1
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431 #endif |
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432 |
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3174
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433 // SIGPWR |
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434 |
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1
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435 #ifdef SIGQUIT |
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1446
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436 octave_set_signal_handler (SIGQUIT, 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 SIGSEGV |
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1446
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440 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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1
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441 #endif |
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442 |
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3174
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443 // SIGSTOP |
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444 |
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1
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445 #ifdef SIGSYS |
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1446
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446 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
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1
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447 #endif |
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448 |
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449 #ifdef SIGTERM |
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1446
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450 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
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1
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451 #endif |
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452 |
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453 #ifdef SIGTRAP |
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1446
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454 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
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1
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455 #endif |
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456 |
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3174
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457 // SIGTSTP |
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458 // SIGTTIN |
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459 // SIGTTOU |
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460 // SIGURG |
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461 |
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1
|
462 #ifdef SIGUSR1 |
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1446
|
463 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
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1
|
464 #endif |
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465 |
|
|
466 #ifdef SIGUSR2 |
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1446
|
467 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
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1
|
468 #endif |
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|
469 |
|
|
470 #ifdef SIGVTALRM |
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1446
|
471 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
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1
|
472 #endif |
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473 |
|
895
|
474 #ifdef SIGIO |
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1446
|
475 octave_set_signal_handler (SIGIO, SIG_IGN); |
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895
|
476 #endif |
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477 |
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3174
|
478 // SIGWINCH |
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|
479 |
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1
|
480 #ifdef SIGXCPU |
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1446
|
481 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
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1
|
482 #endif |
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483 |
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484 #ifdef SIGXFSZ |
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1446
|
485 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
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1
|
486 #endif |
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|
487 } |
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488 |
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886
|
489 #ifndef HAVE_SYS_SIGLIST |
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839
|
490 char *sys_siglist[NSIG + 1] = |
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491 { |
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492 #ifdef AIX |
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493 /* AIX has changed the signals a bit */ |
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494 "bogus signal", /* 0 */ |
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495 "hangup", /* 1 SIGHUP */ |
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496 "interrupt", /* 2 SIGINT */ |
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497 "quit", /* 3 SIGQUIT */ |
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498 "illegal instruction", /* 4 SIGILL */ |
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499 "trace trap", /* 5 SIGTRAP */ |
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500 "IOT instruction", /* 6 SIGIOT */ |
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501 "crash likely", /* 7 SIGDANGER */ |
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502 "floating point exception", /* 8 SIGFPE */ |
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503 "kill", /* 9 SIGKILL */ |
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504 "bus error", /* 10 SIGBUS */ |
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505 "segmentation violation", /* 11 SIGSEGV */ |
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506 "bad argument to system call", /* 12 SIGSYS */ |
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507 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
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508 "alarm clock", /* 14 SIGALRM */ |
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509 "software termination signum", /* 15 SIGTERM */ |
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510 "user defined signal 1", /* 16 SIGUSR1 */ |
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511 "user defined signal 2", /* 17 SIGUSR2 */ |
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512 "death of a child", /* 18 SIGCLD */ |
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513 "power-fail restart", /* 19 SIGPWR */ |
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514 "bogus signal", /* 20 */ |
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515 "bogus signal", /* 21 */ |
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|
516 "bogus signal", /* 22 */ |
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|
517 "bogus signal", /* 23 */ |
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|
518 "bogus signal", /* 24 */ |
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519 "LAN I/O interrupt", /* 25 SIGAIO */ |
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520 "PTY I/O interrupt", /* 26 SIGPTY */ |
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521 "I/O intervention required", /* 27 SIGIOINT */ |
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522 "HFT grant", /* 28 SIGGRANT */ |
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|
523 "HFT retract", /* 29 SIGRETRACT */ |
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|
524 "HFT sound done", /* 30 SIGSOUND */ |
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|
525 "HFT input ready", /* 31 SIGMSG */ |
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|
526 #else /* not AIX */ |
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2512
|
527 #ifdef __EMX__ |
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|
528 "bogus signal #0", /* 0 */ |
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529 "hangup", /* 1 SIGHUP */ |
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530 "interrupt (Ctrl-C)", /* 2 SIGINT (Ctrl-C) */ |
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531 "quit", /* 3 SIGQUIT */ |
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532 "illegal instruction", /* 4 SIGILL */ |
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533 "single step", /* 5 SIGTRAP */ |
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|
534 "abort", /* 6 SIGABRT */ |
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|
535 "EMT instruction", /* 7 SIGEMT */ |
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|
536 "floating point exception", /* 8 SIGFPE */ |
|
|
537 "kill", /* 9 SIGKILL */ |
|
|
538 "bus error", /* 10 SIGBUS */ |
|
|
539 "segmentation violation", /* 11 SIGSEGV */ |
|
|
540 "bad argument to system call", /* 12 SIGSYS */ |
|
|
541 "broken pipe", /* 13 SIGPIPE */ |
|
|
542 "alarm clock", /* 14 SIGALRM */ |
|
|
543 "software termination signum", /* 15 SIGTERM */ |
|
|
544 "user defined signal 1", /* 16 SIGUSR1 */ |
|
|
545 "user defined signal 2", /* 17 SIGUSR2 */ |
|
|
546 "death of a child", /* 18 SIGCHLD */ |
|
|
547 "bogus signal #20", /* 19 */ |
|
|
548 "bogus signal #21", /* 20 */ |
|
|
549 "break (Ctrl-Break)", /* 21 SIGBREAK */ |
|
|
550 #else /* not __EMX__ */ |
|
839
|
551 "bogus signal", /* 0 */ |
|
|
552 "hangup", /* 1 SIGHUP */ |
|
|
553 "interrupt", /* 2 SIGINT */ |
|
|
554 "quit", /* 3 SIGQUIT */ |
|
|
555 "illegal instruction", /* 4 SIGILL */ |
|
|
556 "trace trap", /* 5 SIGTRAP */ |
|
|
557 "IOT instruction", /* 6 SIGIOT */ |
|
|
558 "EMT instruction", /* 7 SIGEMT */ |
|
|
559 "floating point exception", /* 8 SIGFPE */ |
|
|
560 "kill", /* 9 SIGKILL */ |
|
|
561 "bus error", /* 10 SIGBUS */ |
|
|
562 "segmentation violation", /* 11 SIGSEGV */ |
|
|
563 "bad argument to system call", /* 12 SIGSYS */ |
|
|
564 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
|
|
565 "alarm clock", /* 14 SIGALRM */ |
|
|
566 "software termination signum", /* 15 SIGTERM */ |
|
|
567 "user defined signal 1", /* 16 SIGUSR1 */ |
|
|
568 "user defined signal 2", /* 17 SIGUSR2 */ |
|
|
569 "death of a child", /* 18 SIGCLD */ |
|
|
570 "power-fail restart", /* 19 SIGPWR */ |
|
|
571 #ifdef sun |
|
|
572 "window size change", /* 20 SIGWINCH */ |
|
|
573 "urgent socket condition", /* 21 SIGURG */ |
|
|
574 "pollable event occured", /* 22 SIGPOLL */ |
|
|
575 "stop (cannot be caught or ignored)", /* 23 SIGSTOP */ |
|
|
576 "user stop requested from tty", /* 24 SIGTSTP */ |
|
|
577 "stopped process has been continued", /* 25 SIGCONT */ |
|
|
578 "background tty read attempted", /* 26 SIGTTIN */ |
|
|
579 "background tty write attempted", /* 27 SIGTTOU */ |
|
|
580 "virtual timer expired", /* 28 SIGVTALRM */ |
|
|
581 "profiling timer expired", /* 29 SIGPROF */ |
|
|
582 "exceeded cpu limit", /* 30 SIGXCPU */ |
|
|
583 "exceeded file size limit", /* 31 SIGXFSZ */ |
|
|
584 "process's lwps are blocked", /* 32 SIGWAITING */ |
|
|
585 "special signal used by thread library", /* 33 SIGLWP */ |
|
|
586 #ifdef SIGFREEZE |
|
|
587 "Special Signal Used By CPR", /* 34 SIGFREEZE */ |
|
|
588 #endif |
|
|
589 #ifdef SIGTHAW |
|
|
590 "Special Signal Used By CPR", /* 35 SIGTHAW */ |
|
|
591 #endif |
|
|
592 #endif /* sun */ |
|
2512
|
593 #endif /* __EMX__ */ |
|
|
594 #endif /* AIX */ |
|
839
|
595 0 |
|
|
596 }; |
|
|
597 #endif |
|
|
598 |
|
2209
|
599 octave_child_list *octave_child_list::instance = 0; |
|
|
600 |
|
2926
|
601 bool |
|
|
602 octave_child_list::instance_ok (void) |
|
|
603 { |
|
|
604 bool retval = true; |
|
|
605 |
|
|
606 if (! instance) |
|
|
607 instance = new octave_child_list (); |
|
|
608 |
|
|
609 if (! instance) |
|
|
610 { |
|
|
611 ::error ("unable to create child list object!"); |
|
|
612 |
|
|
613 retval = false; |
|
|
614 } |
|
|
615 |
|
|
616 return retval; |
|
|
617 } |
|
|
618 |
|
|
619 void |
|
|
620 octave_child_list::insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
621 { |
|
|
622 if (instance_ok ()) |
|
|
623 instance->do_insert (pid, f); |
|
|
624 } |
|
|
625 |
|
|
626 void |
|
|
627 octave_child_list::remove (pid_t pid) |
|
|
628 { |
|
|
629 if (instance_ok ()) |
|
|
630 instance->do_remove (pid); |
|
|
631 } |
|
|
632 |
|
|
633 int |
|
|
634 octave_child_list::length (void) |
|
|
635 { |
|
|
636 return (instance_ok ()) ? instance->do_length () : 0; |
|
|
637 } |
|
|
638 |
|
|
639 octave_child& |
|
|
640 octave_child_list::elem (int i) |
|
|
641 { |
|
|
642 static octave_child foo; |
|
|
643 |
|
|
644 return (instance_ok ()) ? instance->do_elem (i) : foo; |
|
|
645 } |
|
|
646 |
|
2209
|
647 void |
|
|
648 octave_child_list::do_insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
649 { |
|
|
650 // Insert item in first open slot, increasing size of list if |
|
|
651 // necessary. |
|
|
652 |
|
|
653 bool enlarge = true; |
|
|
654 |
|
|
655 for (int i = 0; i < curr_len; i++) |
|
|
656 { |
|
2305
|
657 octave_child& tmp = list (i); |
|
2209
|
658 |
|
|
659 if (tmp.pid < 0) |
|
|
660 { |
|
2305
|
661 list (i) = octave_child (pid, f); |
|
2209
|
662 enlarge = false; |
|
|
663 break; |
|
|
664 } |
|
|
665 } |
|
|
666 |
|
|
667 if (enlarge) |
|
|
668 { |
|
|
669 int total_len = list.length (); |
|
|
670 |
|
|
671 if (curr_len == total_len) |
|
|
672 { |
|
|
673 if (total_len == 0) |
|
|
674 list.resize (16); |
|
|
675 else |
|
|
676 list.resize (total_len * 2); |
|
|
677 } |
|
|
678 |
|
2305
|
679 list (curr_len) = octave_child (pid, f); |
|
2209
|
680 curr_len++; |
|
|
681 } |
|
|
682 } |
|
|
683 |
|
|
684 void |
|
2210
|
685 octave_child_list::do_remove (pid_t pid) |
|
|
686 { |
|
|
687 // Mark the record for PID invalid. |
|
|
688 |
|
|
689 for (int i = 0; i < curr_len; i++) |
|
|
690 { |
|
2305
|
691 octave_child& tmp = list (i); |
|
2210
|
692 |
|
|
693 if (tmp.pid == pid) |
|
|
694 { |
|
|
695 tmp.pid = -1; |
|
|
696 break; |
|
|
697 } |
|
|
698 } |
|
|
699 } |
|
|
700 |
|
2926
|
701 int |
|
|
702 octave_child_list::do_length (void) const |
|
|
703 { |
|
|
704 return curr_len; |
|
|
705 } |
|
|
706 |
|
|
707 octave_child& |
|
|
708 octave_child_list::do_elem (int i) |
|
2210
|
709 { |
|
2926
|
710 static octave_child foo; |
|
|
711 |
|
|
712 int n = do_length (); |
|
2210
|
713 |
|
2926
|
714 if (i >= 0 && i < n) |
|
|
715 return list (i); |
|
2210
|
716 else |
|
2926
|
717 return foo; |
|
2210
|
718 } |
|
|
719 |
|
1
|
720 /* |
|
|
721 ;;; Local Variables: *** |
|
|
722 ;;; mode: C++ *** |
|
|
723 ;;; End: *** |
|
|
724 */ |
