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:

• If queue_selector is TCIFLUSH it flushes data received but not read. 

• If queue_selector is TCOFLUSH it flushes data written but not transmitted. 

• 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 terminal, 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:

SEE ALSO

tcdrain(3), attributes(5), termio(7I)

SunOS 5.6  —  Last change: 29 Dec 1996