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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 signal.h, not csignal since the latter might only define |
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28 // the ANSI standard C signal interface. |
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29 |
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30 #include <signal.h> |
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31 |
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32 #include "quit.h" |
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33 |
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34 jmp_buf current_context; |
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35 |
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36 void |
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37 octave_save_current_context (void *save_buf) |
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38 { |
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39 memcpy (save_buf, current_context, sizeof (jmp_buf)); |
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40 } |
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41 |
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42 void |
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43 octave_restore_current_context (void *save_buf) |
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44 { |
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45 memcpy (current_context, save_buf, sizeof (jmp_buf)); |
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46 } |
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47 |
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48 void |
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49 octave_jump_to_enclosing_context (void) |
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50 { |
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51 longjmp (current_context, 1); |
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52 } |
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53 |
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54 // Allow us to save the signal mask and then restore it to the most |
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55 // recently saved value. This is necessary when using the POSIX |
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56 // signal handling interface on some systems calling longjmp out of |
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57 // the signal handler to get to the top level on an interrupt doesn't |
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58 // restore the original signal mask. Alternatively, we could use |
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59 // sigsetjmp/siglongjmp, but saving and restoring the signal mask |
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60 // ourselves works ok and seems simpler just now. |
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61 |
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62 #if defined (HAVE_POSIX_SIGNALS) |
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63 static sigset_t octave_signal_mask; |
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64 #endif |
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65 |
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66 void |
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67 octave_save_signal_mask (void) |
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68 { |
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69 #if defined (HAVE_POSIX_SIGNALS) |
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70 sigprocmask (0, 0, &octave_signal_mask); |
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71 #endif |
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72 } |
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73 |
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74 void |
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75 octave_restore_signal_mask (void) |
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76 { |
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77 #if defined (HAVE_POSIX_SIGNALS) |
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78 sigprocmask (SIG_SETMASK, &octave_signal_mask, 0); |
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79 #endif |
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80 } |
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81 |
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82 #if defined (USE_EXCEPTIONS_FOR_INTERRUPTS) |
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83 |
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84 int octave_interrupt_immediately = 0; |
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85 |
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86 int octave_interrupt_state = 0; |
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87 |
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88 void |
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89 octave_throw_interrupt_exception (void) |
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90 { |
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91 throw octave_interrupt_exception (); |
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92 } |
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93 |
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94 #endif |
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95 |
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96 /* |
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97 ;;; Local Variables: *** |
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98 ;;; mode: C++ *** |
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99 ;;; End: *** |
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100 */ |
