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1 /* |
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2 |
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3 Copyright (C) 2002 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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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <cstring> |
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28 |
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29 #include <new> |
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30 |
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31 // Include signal.h, not csignal since the latter might only define |
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32 // the ANSI standard C signal interface. |
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33 |
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34 #include <signal.h> |
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35 |
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36 #include "quit.h" |
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37 |
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38 octave_jmp_buf current_context; |
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39 |
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40 void (*octave_interrupt_hook) (void) = 0; |
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41 void (*octave_bad_alloc_hook) (void) = 0; |
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42 |
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43 void |
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44 octave_save_current_context (void *save_buf) |
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45 { |
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46 std::memcpy (save_buf, current_context, sizeof (octave_jmp_buf)); |
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47 } |
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48 |
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49 void |
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50 octave_restore_current_context (void *save_buf) |
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51 { |
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52 std::memcpy (current_context, save_buf, sizeof (octave_jmp_buf)); |
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53 } |
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54 |
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55 void |
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56 octave_jump_to_enclosing_context (void) |
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57 { |
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58 #if defined (OCTAVE_HAVE_SIG_JUMP) |
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59 siglongjmp (current_context, 1); |
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60 #else |
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61 longjmp (current_context, 1); |
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62 #endif |
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63 } |
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64 |
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65 // Allow us to save the signal mask and then restore it to the most |
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66 // recently saved value. This is necessary when using the POSIX |
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67 // signal handling interface on some systems calling longjmp out of |
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68 // the signal handler to get to the top level on an interrupt doesn't |
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69 // restore the original signal mask. Alternatively, we could use |
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70 // sigsetjmp/siglongjmp, but saving and restoring the signal mask |
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71 // ourselves works ok and seems simpler just now. |
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72 |
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73 #if defined (HAVE_POSIX_SIGNALS) |
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74 static sigset_t octave_signal_mask; |
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75 #endif |
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76 |
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77 void |
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78 octave_save_signal_mask (void) |
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79 { |
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80 #if defined (HAVE_POSIX_SIGNALS) |
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81 sigprocmask (0, 0, &octave_signal_mask); |
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82 #endif |
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83 } |
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84 |
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85 void |
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86 octave_restore_signal_mask (void) |
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87 { |
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88 #if defined (HAVE_POSIX_SIGNALS) |
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89 sigprocmask (SIG_SETMASK, &octave_signal_mask, 0); |
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90 #endif |
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91 } |
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92 |
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93 sig_atomic_t octave_interrupt_immediately = 0; |
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94 |
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95 sig_atomic_t octave_interrupt_state = 0; |
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96 |
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97 sig_atomic_t octave_allocation_error = 0; |
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98 |
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99 void |
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100 octave_throw_interrupt_exception (void) |
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101 { |
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102 if (octave_interrupt_hook) |
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103 octave_interrupt_hook (); |
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104 |
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105 throw octave_interrupt_exception (); |
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106 } |
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107 |
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108 void |
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109 octave_throw_bad_alloc (void) |
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110 { |
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111 if (octave_bad_alloc_hook) |
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112 octave_bad_alloc_hook (); |
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113 |
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114 throw std::bad_alloc (); |
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115 } |
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116 |
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117 /* |
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118 ;;; Local Variables: *** |
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119 ;;; mode: C++ *** |
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120 ;;; End: *** |
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121 */ |
