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tcflush(3) Library Functions Manual tcflush(3) NAME tcflush - Flushes nontransmitted output data or nonread input data LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <termios.h> int tcflush( int filedes, int queue_selector); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: tcflush(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies an open file descriptor associated with a terminal. Speci- fies 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. DESCRIPTION The tcflush() function discards any data written to the object referred to by the filedes parameter, or data received but not read by the ob- ject referred to by filedes, depending on the value of the queue_selec- tor 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. RETURN VALUES 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. ERRORS The tcflush() function sets errno to the specified values for the fol- lowing conditions: The filedes parameter does not specify a valid file descriptor. The queue_selector parameter does not specify a proper value. The file as- sociated with the filedes parameter is not a terminal. RELATED INFORMATION Functions: tcdrain(3), tcflow(3), tcsendbreak(3) Files: termios (4) Standards: standards(5) delim off tcflush(3)