Flush the input or output stream
Synopsis:
#include <sys/dcmd_chr.h>
#define DCMD_CHR_TCFLUSH __DIOT(_CMD_IOCTL_TTY, 16, int) /* TIOCFLUSH */
Arguments to devctl():
| Argument |
Value |
| filedes |
A file descriptor that you obtained by opening the device. |
| dcmd |
DCMD_CHR_TCFLUSH |
| dev_data_ptr |
A pointer to an int |
| n_bytes |
sizeof(int) |
| dev_info_ptr |
NULL |
Description:
This command flushes the input and/or output stream associated with the file descriptor.
It's also implemented as the
TIOCFLUSH
ioctl() command.
Note:
This command is for internal use, and you shouldn't use it directly.
Instead use the
tcflush()
cover function.
Input:
The queue selector; one of:
- TCIFLUSH — discard all data that's received,
but not yet read, on the device associated with fildes.
- TCOFLUSH —
discard all data that's written, but not yet transmitted, on
the device associated with fildes.
- TCIOFLUSH —
discard all data that's written, but not yet transmitted,
as well as all data that's received, but not yet read, on
the device associated with fildes.