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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)

Check Out this Related Man Page

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
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