centos man page for tcflush

TCFLUSH(3P)						     POSIX Programmer's Manual						       TCFLUSH(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
       tcflush - flush non-transmitted output data, non-read input data, or both

SYNOPSIS
       #include <termios.h>

       int tcflush(int fildes, int queue_selector);

DESCRIPTION
       Upon successful completion, tcflush() shall discard data written to the object referred to by fildes (an open  file  descriptor	associated
       with a terminal) but not transmitted, or data received but not read, depending on the value of queue_selector:

	* If queue_selector is TCIFLUSH, it shall flush data received but not read.

	* If queue_selector is TCOFLUSH, it shall flush data written but not transmitted.

	* If queue_selector is TCIOFLUSH, it shall flush both data received but not read and data written but not transmitted.

       Attempts to use tcflush() from a process which is a member of a background process group on a fildes associated with its controlling termi-
       nal 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 tcflush() function shall fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       EINVAL The queue_selector argument is not a supported value.

       ENOTTY The file associated with fildes is not a terminal.

       The tcflush() 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
       tcdrain(), 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							       TCFLUSH(3P)