tcflush(3C) Standard C Library Functions tcflush(3C)
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() discards 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:
o If queue_selector is TCIFLUSH it flushes data received but not read.
o If queue_selector is TCOFLUSH it flushes data written but not transmitted.
o If queue_selector is TCIOFLUSH it flushes 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, will cause the process group to be sent a SIGTTOU signal. If the calling process is blocking or ignoring SIGTTOU signals, the process
is allowed to perform the operation, and no signal is sent.
RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.
ERRORS
The tcflush() function will 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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-------------------------------+
|Interface Stability |Standard |
+-----------------------------+-------------------------------+
|MT-Level |MT-Safe, and Async-Signal-Safe |
+-----------------------------+-------------------------------+
SEE ALSO
tcdrain(3C), attributes(5), standards(5), termio(7I)
SunOS 5.11 14 Aug 2002 tcflush(3C)