isatty(3c) — CX/UX 6.20



ttyname(3C)                                           ttyname(3C)



NAME
     ttyname, isatty - find name of a terminal

SYNOPSIS
     char *ttyname (fildes)
     int fildes;

     int isatty (fildes)
     int fildes;

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

     If isatty returns 0, errno will be set to indicate the rea-
     son:

     [EBADF]        the fildes argument is not a valid open file
                    descriptor, or

     [ENOTTY]       the fildes argument is not associated with a
                    terminal.

NOTES
     The return value of ttyname points to static data whose con-
     tent is overwritten by each call.


















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