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C/C++ Source or Header  |  1992-06-10  |  1.9 KB  |  72 lines
  1. /*-----------------------------------------------------------------------*
  2.  * filename - getcbrk.c
  3.  *
  4.  * function(s)
  5.  *        getcbrk - gets control-break setting
  6.  *        setcbrk - sets control-break setting
  7.  *-----------------------------------------------------------------------*/
  8.  
  9. /*
  10.  *      C/C++ Run Time Library - Version 5.0
  11.  *
  12.  *      Copyright (c) 1987, 1992 by Borland International
  13.  *      All Rights Reserved.
  14.  *
  15.  */
  16.  
  17.  
  18. #include <dos.h>
  19.  
  20. /*---------------------------------------------------------------------*
  21.  
  22. Name            getcbrk - gets control-break setting
  23.  
  24. Usage           int getcbrk(void);
  25.  
  26. Related
  27. functions usage int setcbrk(int value);
  28.  
  29. Prototype in    dos.h
  30.  
  31. Description     getcbrk uses the MS-DOS system call 0x33 to return
  32.                 the current setting of control-break checking.
  33.  
  34. Return value    getcbrk returns 0 if control-break checking is off
  35.                 and returns 1 if checking is on.
  36.  
  37. *---------------------------------------------------------------------*/
  38. int getcbrk(void)
  39. {
  40.         _AX = 0x3300;
  41.         geninterrupt(0x21);
  42.         return(_DL);
  43. }
  44.  
  45.  
  46. /*---------------------------------------------------------------------*
  47.  
  48. Name            setcbrk - sets control-break setting
  49.  
  50. Usage           int setcbrk(int value);
  51.  
  52. Prototype in    dos.h
  53.  
  54. Description     setcbrk uses the MS-DOS system call 0x33 to set control-break
  55.                 checking on or off.
  56.  
  57.                 value   = 0     Turns checking off (check only during
  58.                                 I/O to console, printer, or
  59.                                 communications devices)
  60.                 value   = 1     Turns checking on (check at every system call)
  61.  
  62. Return value    setcbrk returns value.
  63.  
  64. *---------------------------------------------------------------------*/
  65. int setcbrk(int cval)
  66. {
  67.         _AX = 0x3301;
  68.         _DL = cval;
  69.         geninterrupt(0x21);
  70.         return(_DL);
  71. }
  72.