1TCDRAIN(3P)                POSIX Programmer's Manual               TCDRAIN(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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11

NAME

13       tcdrain — wait for transmission of output
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SYNOPSIS

16       #include <termios.h>
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18       int tcdrain(int fildes);
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DESCRIPTION

21       The tcdrain() function shall block until  all  output  written  to  the
22       object  referred to by fildes is transmitted. The fildes argument is an
23       open file descriptor associated with a terminal.
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25       Any attempts to use tcdrain() from a process which is  a  member  of  a
26       background  process  group  on a fildes associated with its controlling
27       terminal, shall cause the process group to be sent  a  SIGTTOU  signal.
28       If  the  calling  thread  is blocking SIGTTOU signals or the process is
29       ignoring SIGTTOU signals, the process shall be allowed to  perform  the
30       operation, and no signal is sent.
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RETURN VALUE

33       Upon successful completion, 0 shall be returned. Otherwise, −1 shall be
34       returned and errno set to indicate the error.
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ERRORS

37       The tcdrain() function shall fail if:
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39       EBADF  The fildes argument is not a valid file descriptor.
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41       EINTR  A signal interrupted tcdrain().
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43       EIO    The process group of the writing process is orphaned, the  call‐
44              ing  thread  is  not  blocking  SIGTTOU,  and the process is not
45              ignoring SIGTTOU.
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47       ENOTTY The file associated with fildes is not a terminal.
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49       The following sections are informative.
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EXAMPLES

52       None.
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APPLICATION USAGE

55       None.
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RATIONALE

58       None.
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FUTURE DIRECTIONS

61       None.
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SEE ALSO

64       tcflush()
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66       The Base Definitions volume of POSIX.1‐2008, Chapter 11, General Termi‐
67       nal Interface, <termios.h>
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70       Portions  of  this text are reprinted and reproduced in electronic form
71       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
72       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
73       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
74       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
75       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
76       event of any discrepancy between this version and the original IEEE and
77       The Open Group Standard, the original IEEE and The Open Group  Standard
78       is  the  referee document. The original Standard can be obtained online
79       at http://www.unix.org/online.html .
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81       Any typographical or formatting errors that appear  in  this  page  are
82       most likely to have been introduced during the conversion of the source
83       files to man page format. To report such errors,  see  https://www.ker‐
84       nel.org/doc/man-pages/reporting_bugs.html .
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88IEEE/The Open Group                  2013                          TCDRAIN(3P)
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