Standard C Library (libc.so, libc.a)
Interfaces documented on this reference page conform to industry standards as follows:
tcflush(): XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
Specifies an open file descriptor associated with a terminal. Specifies one of the following: Flush data received but not read. Flush data written but not transmitted. Flush both data received but not read and data written but not transmitted.
The tcflush() function discards any data written to the object referred to by the filedes parameter, or data received but not read by the object referred to by filedes, depending on the value of the queue_selector parameter.
A process group is sent a SIGTTOU signal if the tcflush() function is called from one of its member processes. If the calling process is blocking or ignoring SIGTTOU signals, the process is allowed to perform the operation and no signal is sent.
Upon successful completion, a value of 0 (zero) is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
The tcflush() function sets errno to the specified values for the following conditions:
The filedes parameter does not specify a valid file descriptor. The queue_selector parameter does not specify a proper value. The file associated with the filedes parameter is not a terminal.
Functions: tcdrain(3), tcflow(3), tcsendbreak(3)
Files: termios (4)
Standards: standards(5) delim off