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C/C++ Source or Header  |  1979-04-19  |  116 b   |  11 lines
  1. #include <sgtty.h>
  2.  
  3. /* is unit c a tty? */
  4. isatty(c)
  5.     int c;
  6. {
  7.     struct sgttyb tty;
  8.  
  9.     return (gtty(c, &tty) == 0);
  10. }
  11.