ttyslot(3) [bsd man page]

TTYNAME(3)						     Library Functions Manual							TTYNAME(3)

NAME

       ttyname, isatty, ttyslot - find name of a terminal

SYNOPSIS

       char *ttyname(filedes)

       isatty(filedes)

       ttyslot()

DESCRIPTION

       Ttyname returns a pointer to the null-terminated path name of the terminal device associated with file descriptor filedes (this is a system
       file descriptor and has nothing to do with the standard I/O FILE typedef).

       Isatty returns 1 if filedes is associated with a terminal device, 0 otherwise.

       Ttyslot returns the number of the entry in the ttys(5) file for the control terminal of the current process.

FILES

       /dev/*
       /etc/ttys

SEE ALSO

       ioctl(2), ttys(5)

DIAGNOSTICS

       Ttyname returns a null pointer (0) if filedes does not describe a terminal device in directory `/dev'.

       Ttyslot returns 0 if `/etc/ttys' is inaccessible or if it cannot determine the control terminal.

BUGS

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

7th Edition							   May 15, 1985 							TTYNAME(3)

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