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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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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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2931
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77 #define REINSTALL_USES_SIG 1 |
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2554
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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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211 if (n == 0) |
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212 { |
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213 waitpid (-1, 0, WNOHANG); |
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214 } |
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215 else |
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216 { |
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217 for (int i = 0; i < n; i++) |
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218 { |
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219 octave_child& elt = octave_child_list::elem (i); |
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2209
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220 |
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221 pid_t pid = elt.pid; |
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222 |
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223 if (pid > 0) |
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224 { |
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225 int status; |
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226 |
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227 if (waitpid (pid, &status, WNOHANG) > 0) |
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228 { |
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229 elt.pid = -1; |
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230 |
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231 octave_child::dead_child_handler f = elt.handler; |
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232 |
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233 if (f) |
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234 f (pid, status); |
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235 |
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236 break; |
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237 } |
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238 } |
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239 } |
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240 } |
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241 |
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242 octave_set_interrupt_handler (saved_interrupt_handler); |
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243 |
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244 UNBLOCK_CHILD (oset); |
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245 |
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246 #ifdef __EMX__ |
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247 octave_set_signal_handler (SIGCHLD, saved_sigchld_handler); |
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248 #endif |
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249 |
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250 MAYBE_ACK_SIGNAL (SIGCHLD); |
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251 |
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252 MAYBE_REINSTALL_SIGHANDLER (SIGCHLD, sigchld_handler); |
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253 |
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254 SIGHANDLER_RETURN (0); |
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255 } |
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256 |
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257 #if defined (__alpha__) |
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258 static RETSIGTYPE |
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259 sigfpe_handler (int /* sig */) |
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260 { |
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261 MAYBE_ACK_SIGNAL (SIGFPE); |
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262 |
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263 MAYBE_REINSTALL_SIGHANDLER (SIGFPE, sigfpe_handler); |
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264 |
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265 cerr << "error: floating point exception -- trying to return to prompt\n"; |
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266 |
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267 if (can_interrupt) |
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268 { |
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269 jump_to_top_level (); |
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270 panic_impossible (); |
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271 } |
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272 |
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273 SIGHANDLER_RETURN (0); |
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274 } |
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275 #endif |
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276 |
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635
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277 // Handle SIGINT by restarting the parser (see octave.cc). |
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278 // |
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279 // This also has to work for SIGBREAK (on systems that have it), so we |
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280 // use the value of sig, instead of just assuming that it is called |
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281 // for SIGINT only. |
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282 |
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283 static RETSIGTYPE |
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284 #if defined (ACK_USES_SIG) || defined (REINSTALL_USES_SIG) |
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285 sigint_handler (int sig) |
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2931
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286 #else |
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287 sigint_handler (int) |
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288 #endif |
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1
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289 { |
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290 MAYBE_ACK_SIGNAL (sig); |
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291 |
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292 MAYBE_REINSTALL_SIGHANDLER (sig, sigint_handler); |
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293 |
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1
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294 if (can_interrupt) |
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295 { |
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296 jump_to_top_level (); |
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297 panic_impossible (); |
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298 } |
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299 |
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2469
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300 SIGHANDLER_RETURN (0); |
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301 } |
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302 |
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303 static RETSIGTYPE |
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304 sigpipe_handler (int /* sig */) |
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1
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305 { |
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306 MAYBE_ACK_SIGNAL (SIGPIPE); |
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307 |
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308 MAYBE_REINSTALL_SIGHANDLER (SIGPIPE, sigpipe_handler); |
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309 |
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1
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310 if (pipe_handler_error_count++ == 0) |
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2795
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311 cerr << "warning: broken pipe\n"; |
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1
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312 |
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1358
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313 // Don't loop forever on account of this. |
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314 |
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1
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315 if (pipe_handler_error_count > 100) |
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316 jump_to_top_level (); |
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317 |
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2469
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318 SIGHANDLER_RETURN (0); |
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1
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319 } |
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320 |
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2705
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321 octave_interrupt_handler |
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322 octave_catch_interrupts (void) |
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323 { |
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2705
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324 octave_interrupt_handler retval; |
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325 |
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326 #ifdef SIGINT |
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2705
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327 retval.int_handler = octave_set_signal_handler (SIGINT, sigint_handler); |
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2554
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328 #endif |
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329 |
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330 #ifdef SIGBREAK |
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2705
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331 retval.brk_handler = octave_set_signal_handler (SIGBREAK, sigint_handler); |
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2554
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332 #endif |
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2705
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333 |
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334 return retval; |
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2554
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335 } |
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336 |
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2705
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337 octave_interrupt_handler |
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338 octave_ignore_interrupts (void) |
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2554
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339 { |
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2705
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340 octave_interrupt_handler retval; |
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341 |
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2554
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342 #ifdef SIGINT |
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2705
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343 retval.int_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
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2554
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344 #endif |
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345 |
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346 #ifdef SIGBREAK |
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2705
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347 retval.brk_handler = octave_set_signal_handler (SIGBREAK, SIG_IGN); |
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2554
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348 #endif |
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2705
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349 |
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350 return retval; |
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351 } |
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352 |
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353 octave_interrupt_handler |
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354 octave_set_interrupt_handler (const volatile octave_interrupt_handler& h) |
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355 { |
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356 octave_interrupt_handler retval; |
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357 |
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358 #ifdef SIGINT |
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359 retval.int_handler = octave_set_signal_handler (SIGINT, h.int_handler); |
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360 #endif |
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361 |
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362 #ifdef SIGBREAK |
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363 retval.brk_handler = octave_set_signal_handler (SIGBREAK, h.brk_handler); |
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364 #endif |
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365 |
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366 return retval; |
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1651
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367 } |
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368 |
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635
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369 // Install all the handlers for the signals we might care about. |
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370 |
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1
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371 void |
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372 install_signal_handlers (void) |
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373 { |
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635
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374 set_new_handler (octave_new_handler); |
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375 |
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2554
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376 octave_catch_interrupts (); |
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377 |
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1
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378 #ifdef SIGABRT |
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1446
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379 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
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1
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380 #endif |
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381 |
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382 #ifdef SIGALRM |
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1446
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383 octave_set_signal_handler (SIGALRM, generic_sig_handler); |
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1
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384 #endif |
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385 |
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386 #ifdef SIGBUS |
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1446
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387 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
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1
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388 #endif |
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389 |
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1230
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390 #ifdef SIGCHLD |
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1446
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391 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
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1230
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392 #endif |
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393 |
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1
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394 #ifdef SIGEMT |
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1446
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395 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
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1
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396 #endif |
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397 |
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398 #ifdef SIGFPE |
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1373
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399 #if defined (__alpha__) |
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1446
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400 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
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1373
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401 #else |
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1446
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402 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
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1
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403 #endif |
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1373
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404 #endif |
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1
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405 |
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406 #ifdef SIGHUP |
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1446
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407 octave_set_signal_handler (SIGHUP, generic_sig_handler); |
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1
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408 #endif |
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409 |
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410 #ifdef SIGILL |
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1446
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411 octave_set_signal_handler (SIGILL, generic_sig_handler); |
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1
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412 #endif |
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413 |
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414 #ifdef SIGIOT |
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1446
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415 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
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1
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416 #endif |
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417 |
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418 #ifdef SIGLOST |
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1446
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419 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
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1
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420 #endif |
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421 |
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422 #ifdef SIGPIPE |
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1446
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423 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
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1
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424 #endif |
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425 |
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426 #ifdef SIGPOLL |
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1446
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427 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
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1
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428 #endif |
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429 |
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430 #ifdef SIGPROF |
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1446
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431 octave_set_signal_handler (SIGPROF, generic_sig_handler); |
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1
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432 #endif |
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433 |
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434 #ifdef SIGQUIT |
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1446
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435 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
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1
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436 #endif |
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437 |
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438 #ifdef SIGSEGV |
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1446
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439 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
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1
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440 #endif |
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441 |
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442 #ifdef SIGSYS |
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1446
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443 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
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1
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444 #endif |
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445 |
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446 #ifdef SIGTERM |
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1446
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447 octave_set_signal_handler (SIGTERM, generic_sig_handler); |
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1
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448 #endif |
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449 |
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450 #ifdef SIGTRAP |
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1446
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451 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
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1
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452 #endif |
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453 |
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454 #ifdef SIGUSR1 |
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1446
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455 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
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1
|
456 #endif |
|
|
457 |
|
|
458 #ifdef SIGUSR2 |
|
1446
|
459 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
|
1
|
460 #endif |
|
|
461 |
|
|
462 #ifdef SIGVTALRM |
|
1446
|
463 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
|
1
|
464 #endif |
|
|
465 |
|
895
|
466 #ifdef SIGIO |
|
1446
|
467 octave_set_signal_handler (SIGIO, SIG_IGN); |
|
895
|
468 #endif |
|
|
469 |
|
1
|
470 #ifdef SIGXCPU |
|
1446
|
471 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
|
1
|
472 #endif |
|
|
473 |
|
|
474 #ifdef SIGXFSZ |
|
1446
|
475 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
|
1
|
476 #endif |
|
|
477 } |
|
|
478 |
|
886
|
479 #ifndef HAVE_SYS_SIGLIST |
|
839
|
480 char *sys_siglist[NSIG + 1] = |
|
|
481 { |
|
|
482 #ifdef AIX |
|
|
483 /* AIX has changed the signals a bit */ |
|
|
484 "bogus signal", /* 0 */ |
|
|
485 "hangup", /* 1 SIGHUP */ |
|
|
486 "interrupt", /* 2 SIGINT */ |
|
|
487 "quit", /* 3 SIGQUIT */ |
|
|
488 "illegal instruction", /* 4 SIGILL */ |
|
|
489 "trace trap", /* 5 SIGTRAP */ |
|
|
490 "IOT instruction", /* 6 SIGIOT */ |
|
|
491 "crash likely", /* 7 SIGDANGER */ |
|
|
492 "floating point exception", /* 8 SIGFPE */ |
|
|
493 "kill", /* 9 SIGKILL */ |
|
|
494 "bus error", /* 10 SIGBUS */ |
|
|
495 "segmentation violation", /* 11 SIGSEGV */ |
|
|
496 "bad argument to system call", /* 12 SIGSYS */ |
|
|
497 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
|
|
498 "alarm clock", /* 14 SIGALRM */ |
|
|
499 "software termination signum", /* 15 SIGTERM */ |
|
|
500 "user defined signal 1", /* 16 SIGUSR1 */ |
|
|
501 "user defined signal 2", /* 17 SIGUSR2 */ |
|
|
502 "death of a child", /* 18 SIGCLD */ |
|
|
503 "power-fail restart", /* 19 SIGPWR */ |
|
|
504 "bogus signal", /* 20 */ |
|
|
505 "bogus signal", /* 21 */ |
|
|
506 "bogus signal", /* 22 */ |
|
|
507 "bogus signal", /* 23 */ |
|
|
508 "bogus signal", /* 24 */ |
|
|
509 "LAN I/O interrupt", /* 25 SIGAIO */ |
|
|
510 "PTY I/O interrupt", /* 26 SIGPTY */ |
|
|
511 "I/O intervention required", /* 27 SIGIOINT */ |
|
|
512 "HFT grant", /* 28 SIGGRANT */ |
|
|
513 "HFT retract", /* 29 SIGRETRACT */ |
|
|
514 "HFT sound done", /* 30 SIGSOUND */ |
|
|
515 "HFT input ready", /* 31 SIGMSG */ |
|
|
516 #else /* not AIX */ |
|
2512
|
517 #ifdef __EMX__ |
|
|
518 "bogus signal #0", /* 0 */ |
|
|
519 "hangup", /* 1 SIGHUP */ |
|
|
520 "interrupt (Ctrl-C)", /* 2 SIGINT (Ctrl-C) */ |
|
|
521 "quit", /* 3 SIGQUIT */ |
|
|
522 "illegal instruction", /* 4 SIGILL */ |
|
|
523 "single step", /* 5 SIGTRAP */ |
|
|
524 "abort", /* 6 SIGABRT */ |
|
|
525 "EMT instruction", /* 7 SIGEMT */ |
|
|
526 "floating point exception", /* 8 SIGFPE */ |
|
|
527 "kill", /* 9 SIGKILL */ |
|
|
528 "bus error", /* 10 SIGBUS */ |
|
|
529 "segmentation violation", /* 11 SIGSEGV */ |
|
|
530 "bad argument to system call", /* 12 SIGSYS */ |
|
|
531 "broken pipe", /* 13 SIGPIPE */ |
|
|
532 "alarm clock", /* 14 SIGALRM */ |
|
|
533 "software termination signum", /* 15 SIGTERM */ |
|
|
534 "user defined signal 1", /* 16 SIGUSR1 */ |
|
|
535 "user defined signal 2", /* 17 SIGUSR2 */ |
|
|
536 "death of a child", /* 18 SIGCHLD */ |
|
|
537 "bogus signal #20", /* 19 */ |
|
|
538 "bogus signal #21", /* 20 */ |
|
|
539 "break (Ctrl-Break)", /* 21 SIGBREAK */ |
|
|
540 #else /* not __EMX__ */ |
|
839
|
541 "bogus signal", /* 0 */ |
|
|
542 "hangup", /* 1 SIGHUP */ |
|
|
543 "interrupt", /* 2 SIGINT */ |
|
|
544 "quit", /* 3 SIGQUIT */ |
|
|
545 "illegal instruction", /* 4 SIGILL */ |
|
|
546 "trace trap", /* 5 SIGTRAP */ |
|
|
547 "IOT instruction", /* 6 SIGIOT */ |
|
|
548 "EMT instruction", /* 7 SIGEMT */ |
|
|
549 "floating point exception", /* 8 SIGFPE */ |
|
|
550 "kill", /* 9 SIGKILL */ |
|
|
551 "bus error", /* 10 SIGBUS */ |
|
|
552 "segmentation violation", /* 11 SIGSEGV */ |
|
|
553 "bad argument to system call", /* 12 SIGSYS */ |
|
|
554 "write on a pipe with no one to read it", /* 13 SIGPIPE */ |
|
|
555 "alarm clock", /* 14 SIGALRM */ |
|
|
556 "software termination signum", /* 15 SIGTERM */ |
|
|
557 "user defined signal 1", /* 16 SIGUSR1 */ |
|
|
558 "user defined signal 2", /* 17 SIGUSR2 */ |
|
|
559 "death of a child", /* 18 SIGCLD */ |
|
|
560 "power-fail restart", /* 19 SIGPWR */ |
|
|
561 #ifdef sun |
|
|
562 "window size change", /* 20 SIGWINCH */ |
|
|
563 "urgent socket condition", /* 21 SIGURG */ |
|
|
564 "pollable event occured", /* 22 SIGPOLL */ |
|
|
565 "stop (cannot be caught or ignored)", /* 23 SIGSTOP */ |
|
|
566 "user stop requested from tty", /* 24 SIGTSTP */ |
|
|
567 "stopped process has been continued", /* 25 SIGCONT */ |
|
|
568 "background tty read attempted", /* 26 SIGTTIN */ |
|
|
569 "background tty write attempted", /* 27 SIGTTOU */ |
|
|
570 "virtual timer expired", /* 28 SIGVTALRM */ |
|
|
571 "profiling timer expired", /* 29 SIGPROF */ |
|
|
572 "exceeded cpu limit", /* 30 SIGXCPU */ |
|
|
573 "exceeded file size limit", /* 31 SIGXFSZ */ |
|
|
574 "process's lwps are blocked", /* 32 SIGWAITING */ |
|
|
575 "special signal used by thread library", /* 33 SIGLWP */ |
|
|
576 #ifdef SIGFREEZE |
|
|
577 "Special Signal Used By CPR", /* 34 SIGFREEZE */ |
|
|
578 #endif |
|
|
579 #ifdef SIGTHAW |
|
|
580 "Special Signal Used By CPR", /* 35 SIGTHAW */ |
|
|
581 #endif |
|
|
582 #endif /* sun */ |
|
2512
|
583 #endif /* __EMX__ */ |
|
|
584 #endif /* AIX */ |
|
839
|
585 0 |
|
|
586 }; |
|
|
587 #endif |
|
|
588 |
|
2209
|
589 octave_child_list *octave_child_list::instance = 0; |
|
|
590 |
|
2926
|
591 bool |
|
|
592 octave_child_list::instance_ok (void) |
|
|
593 { |
|
|
594 bool retval = true; |
|
|
595 |
|
|
596 if (! instance) |
|
|
597 instance = new octave_child_list (); |
|
|
598 |
|
|
599 if (! instance) |
|
|
600 { |
|
|
601 ::error ("unable to create child list object!"); |
|
|
602 |
|
|
603 retval = false; |
|
|
604 } |
|
|
605 |
|
|
606 return retval; |
|
|
607 } |
|
|
608 |
|
|
609 void |
|
|
610 octave_child_list::insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
611 { |
|
|
612 if (instance_ok ()) |
|
|
613 instance->do_insert (pid, f); |
|
|
614 } |
|
|
615 |
|
|
616 void |
|
|
617 octave_child_list::remove (pid_t pid) |
|
|
618 { |
|
|
619 if (instance_ok ()) |
|
|
620 instance->do_remove (pid); |
|
|
621 } |
|
|
622 |
|
|
623 int |
|
|
624 octave_child_list::length (void) |
|
|
625 { |
|
|
626 return (instance_ok ()) ? instance->do_length () : 0; |
|
|
627 } |
|
|
628 |
|
|
629 octave_child& |
|
|
630 octave_child_list::elem (int i) |
|
|
631 { |
|
|
632 static octave_child foo; |
|
|
633 |
|
|
634 return (instance_ok ()) ? instance->do_elem (i) : foo; |
|
|
635 } |
|
|
636 |
|
2209
|
637 void |
|
|
638 octave_child_list::do_insert (pid_t pid, octave_child::dead_child_handler f) |
|
|
639 { |
|
|
640 // Insert item in first open slot, increasing size of list if |
|
|
641 // necessary. |
|
|
642 |
|
|
643 bool enlarge = true; |
|
|
644 |
|
|
645 for (int i = 0; i < curr_len; i++) |
|
|
646 { |
|
2305
|
647 octave_child& tmp = list (i); |
|
2209
|
648 |
|
|
649 if (tmp.pid < 0) |
|
|
650 { |
|
2305
|
651 list (i) = octave_child (pid, f); |
|
2209
|
652 enlarge = false; |
|
|
653 break; |
|
|
654 } |
|
|
655 } |
|
|
656 |
|
|
657 if (enlarge) |
|
|
658 { |
|
|
659 int total_len = list.length (); |
|
|
660 |
|
|
661 if (curr_len == total_len) |
|
|
662 { |
|
|
663 if (total_len == 0) |
|
|
664 list.resize (16); |
|
|
665 else |
|
|
666 list.resize (total_len * 2); |
|
|
667 } |
|
|
668 |
|
2305
|
669 list (curr_len) = octave_child (pid, f); |
|
2209
|
670 curr_len++; |
|
|
671 } |
|
|
672 } |
|
|
673 |
|
|
674 void |
|
2210
|
675 octave_child_list::do_remove (pid_t pid) |
|
|
676 { |
|
|
677 // Mark the record for PID invalid. |
|
|
678 |
|
|
679 for (int i = 0; i < curr_len; i++) |
|
|
680 { |
|
2305
|
681 octave_child& tmp = list (i); |
|
2210
|
682 |
|
|
683 if (tmp.pid == pid) |
|
|
684 { |
|
|
685 tmp.pid = -1; |
|
|
686 break; |
|
|
687 } |
|
|
688 } |
|
|
689 } |
|
|
690 |
|
2926
|
691 int |
|
|
692 octave_child_list::do_length (void) const |
|
|
693 { |
|
|
694 return curr_len; |
|
|
695 } |
|
|
696 |
|
|
697 octave_child& |
|
|
698 octave_child_list::do_elem (int i) |
|
2210
|
699 { |
|
2926
|
700 static octave_child foo; |
|
|
701 |
|
|
702 int n = do_length (); |
|
2210
|
703 |
|
2926
|
704 if (i >= 0 && i < n) |
|
|
705 return list (i); |
|
2210
|
706 else |
|
2926
|
707 return foo; |
|
2210
|
708 } |
|
|
709 |
|
1
|
710 /* |
|
|
711 ;;; Local Variables: *** |
|
|
712 ;;; mode: C++ *** |
|
|
713 ;;; End: *** |
|
|
714 */ |
