PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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

PROLOG         top

       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         top

       tcflush — flush non-transmitted output data, non-read input data, or
       both

SYNOPSIS         top

       #include <termios.h>
       int tcflush(int fildes, int queue_selector);

DESCRIPTION         top

       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
       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         top

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

ERRORS         top

       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.
       EIO    The process group of the writing process is orphaned, the
              calling 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         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       tcdrain(3p)
       The Base Definitions volume of POSIX.1‐2008, Chapter 11, General
       Terminal Interface, termios.h(0p)

COPYRIGHT         top

       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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                 2013                         TCFLUSH(3P)

Pages that refer to this page: termios.h(0p)tcdrain(3p)