centos man page for tcdrain

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 correspond-
       ing 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, Chapter 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 Technol-
       ogy -- 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(3P)