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ISATTY   (3) manpage
ISATTY
3
2008-12-03
Linux
Linux Programmer's Manual
  • 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
  • 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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