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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 terminal; other-
       wise 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 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2008-12-03                         ISATTY(3)

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