• 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 3.19 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/.
  

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