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Standard C Library Functionsisatty(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 TYPEATTRIBUTE VALUE
MT-LevelMT-Safe

SEE ALSO

 

ttyname(3C), attributes(5)


SunOS 5.9Go To TopLast Changed 29 Dec 1996

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.