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TCDRAIN(3P)		   POSIX Programmer's Manual		   TCDRAIN(3P)

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	 thread	 is blocking SIGTTOU signals or the process is
       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().

       EIO    The process group of the writing process is orphaned, the	 call‐
	      ing  thread  is  not  blocking  SIGTTOU,	and the process is not
	      ignoring SIGTTOU.

       ENOTTY The file associated with fildes is not a terminal.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       tcflush()

       The Base Definitions volume of POSIX.1‐2008, Chapter 11, General Termi‐
       nal Interface, <termios.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  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.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			   TCDRAIN(3P)

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