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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 terminal; 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 specifies 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 3.54 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/.