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TTYNAME(3)               BSD Library Functions Manual               TTYNAME(3)

NAME
     isatty, ttyname, ttyslot -- get name of associated terminal (tty) from file descriptor

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     isatty(int fildes);

     char *
     ttyname(int fildes);

     int
     ttyslot(void);

DESCRIPTION
     These functions operate on the system file descriptors for terminal type devices.  These descriptors
     are not related to the standard I/O FILE typedef, but refer to the special device files found in /dev
     and named /dev/ttyxx and for which an entry exists in the initialization file /etc/ttys.  (See
     ttys(5).)

     The isatty() function determines if the file descriptor fildes refers to a valid terminal type device.

     The ttyname() function gets the related device name of a file descriptor for which isatty() is true.

     The ttyslot() function fetches the current process' control terminal number from the ttys(5) file
     entry.

RETURN VALUES
     The ttyname() function returns the null terminated name if the device is found and isatty() is true;
     otherwise, a NULL pointer is returned.

     The ttyslot() function returns the unit number of the device file if found; otherwise, the value zero
     is returned.

FILES
     /dev/*
     /etc/ttys

SEE ALSO
     ioctl(2), ttys(5)

HISTORY
     A isatty(), ttyname(), and ttyslot() function appeared in Version 7 AT&T UNIX.

BUGS
     The ttyname() function leaves its result in an internal static object and returns a pointer to that
     object.  Subsequent calls to ttyname() will modify the same object.

BSD                              June 4, 1993                              BSD