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TCDRAIN(P)			    POSIX Programmer's Manual			       TCDRAIN(P)

NAME
       tcdrain - wait for transmission of output

SYNOPSIS
       #include <termios.h>

       int tcdrain(int fildes);

DESCRIPTION
       The  tcdrain()  function shall block until all output written to the object referred to by
       fildes is transmitted.  The fildes argument is an open file descriptor associated  with	a
       terminal.

       Any  attempts  to  use  tcdrain() from a process which is a member of a background process
       group on a fildes associated with its controlling terminal, shall cause the process  group
       to  be  sent a SIGTTOU signal. If the calling process is blocking or ignoring SIGTTOU sig-
       nals, the process shall be allowed to perform the operation, and no signal is sent.

RETURN VALUE
       Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno
       set to indicate the error.

ERRORS
       The tcdrain() function shall fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       EINTR  A signal interrupted tcdrain().

       ENOTTY The file associated with fildes is not a terminal.

       The tcdrain() function may fail if:

       EIO    The  process  group  of the writing process is orphaned, and the writing process is
	      not ignoring or blocking SIGTTOU.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       tcflush() , the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 11, General  Ter-
       minal Interface, <termios.h>, <unistd.h>

COPYRIGHT
       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       TCDRAIN(P)
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