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     TTYNAME()                 UNIX System V                 TTYNAME()



     Name
          ttyname, isatty - find name of a terminal

     Syntax
          char *ttyname (fildes)
          int fildes;

          int isatty (fildes)
          int fildes;

     Description
          The ttyname function returns a pointer to a string
          containing the null-terminated path name of the terminal
          device associated with file descriptor fildes.

          isatty returns 1 if fildes is associated with a terminal
          device, 0 otherwise.

     Files
          /dev/*

     Diagnostics
          The ttyname function returns a NULL pointer if fildes does
          not describe a terminal device in directory /dev .

     Note
          The return value points to static data whose content is
          overwritten by each call.

     Standards Conformance
          isatty and ttyname are conformant with:
          AT&T SVID Issue 2, Select Code 307-127;
          The X/Open Portability Guide II of January 1987;
          IEEE POSIX Std 1003.1-1988 with C Standard Language-
          Dependent System Support;
          and NIST FIPS 151-1.
                                                (printed 6/20/89)