isatty(3c) [sunos man page]

isatty(3C)						   Standard C Library Functions 						isatty(3C)

NAME

       isatty - test for a terminal device

SYNOPSIS

       #include <unistd.h>

       int isatty(int fildes);

DESCRIPTION

       The isatty() function tests whether fildes, an open file descriptor, is associated with a terminal device.

RETURN VALUES

       The isatty() function returns 1 if fildes is associated with a terminal; otherwise it returns 0 and may set errno to indicate the error.

ERRORS

       The isatty() function may fail if:

       EBADF	       The fildes argument is not a valid open file descriptor.

       ENOTTY	       The fildes argument is not associated with a terminal.

USAGE

       The  isatty()  function does not necessarily indicate that a human being is available for interaction via fildes. It is quite possible that
       non-terminal devices are connected to the communications line.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ttyname(3C), attributes(5), standards(5)

SunOS 5.10							    24 Jul 2002 							isatty(3C)

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