|TCFLUSH(3P)||POSIX Programmer's Manual||TCFLUSH(3P)|
int tcflush(int fildes, int 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.
- The fildes argument is not a valid file descriptor.
- The queue_selector argument is not a supported value.
- The process group of the writing process is orphaned, the calling thread is not blocking SIGTTOU, and the process is not ignoring SIGTTOU.
- The file associated with fildes is not a terminal.
The following sections are informative.
The Base Definitions volume of POSIX.1‐2017, Chapter 11, General Terminal Interface, <termios.h>
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|2017||IEEE/The Open Group|