DCMD_CHR_TCFLUSH
QNX SDP8.0Devctl and Ioctl CommandsDeveloper
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 filedes.
- TCOFLUSH — discard all data that's written, but not yet transmitted, on the device associated with filedes.
- 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 filedes.
Output:
None.
See also:
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