ttyname(3)                          CLIX                          ttyname(3)



  NAME

    ttyname, isatty - Gets the name of a terminal

  LIBRARY

    Standard C Library (libc.a)

  SYNOPSIS

    char *ttyname(
      int file_descriptor );

    int isatty(
      int file_descriptor );

  PARAMETERS

    file_descriptor   Specifies an open file descriptor.

  DESCRIPTION

    The ttyname() function returns a pointer to a string containing the null-
    terminated pathname of the terminal device associated with file descriptor
    specified by the file_descriptor parameter.  A NULL pointer is returned if
    the file descriptor does not describe a terminal device in the /dev
    directory.

    The return value of ttyname() points to static data that is overwritten by
    each call.

    The isatty() function determines if the device associated with the file
    descriptor specified by the file_descriptor parameter is a terminal.

  FILES

    /dev/*   Directory for device files.

  RETURN VALUES

    The ttyname() function returns a pointer to a string containing the null-
    terminated pathname of the terminal device associated with
    file_descriptor.  A NULL pointer is returned if the file descriptor does
    not describe a terminal device in the /dev directory.

    The isatty() function returns a value of 1 if the specified file
    descriptor is associated with a terminal.  If the file descriptor is not
    associated with a terminal, a value of 0 is returned.

  RELATED INFORMATION




  2/94 - Intergraph Corporation                                              1

  ttyname(3)                          CLIX                          ttyname(3)



    Functions:  ttyslot(3)





















































  2                                              Intergraph Corporation - 2/94