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

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

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 signals, 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, Chap‐
       ter 11, General Terminal 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 original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			    TCDRAIN(P)

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