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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
       referring 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)