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Test Your Knowledge in Computers #367
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The Single UNIX Specification specifies vi, so every conforming UNIX system must have it.
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(opensolaris section 3c)
man page for isatty

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 5.11 24 Jul 2002 isatty(3C)

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