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ISATTY(3)		   Linux Programmer's Manual		     ISATTY(3)

NAME
       isatty -	test whether a file descriptor refers to a terminal

SYNOPSIS
       #include	<unistd.h>

       int isatty(int fd);

DESCRIPTION
       The  isatty()  function tests whether fd	is an open file	descriptor re-
       ferring to a terminal.

RETURN VALUE
       isatty()	returns	1 if fd	is an open file	descriptor referring to	a ter-
       minal; otherwise	0 is returned, and errno is set	to indicate the	error.

ERRORS
       EBADF  fd is not	a valid	file descriptor.

       EINVAL fd  refers to a file other than a	terminal.  POSIX.1-2001	speci-
	      fies the error ENOTTY for	this case.

CONFORMING TO
       SVr4, 4.3BSD, POSIX.1-2001.

SEE ALSO
       fstat(2), ttyname(3)

COLOPHON
       This page is part of release 3.53 of the	Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found	at http://www.kernel.org/doc/man-pages/.

Linux				  2008-12-03			     ISATTY(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON

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