tcflush(3p) - phpMan

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  corresponding
       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 back-
       ground 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 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                          TCFLUSH(3P)