Perform a flow-control operation on a data stream
Synopsis:
#include <sys/dcmd_chr.h>
#define DCMD_CHR_TCFLOW __DIOT('T', 6, int) /* TCXONC */
Arguments to devctl():
| Argument |
Value |
| filedes |
A file descriptor that you obtained by opening the device. |
| dcmd |
DCMD_CHR_TCFLOW |
| dev_data_ptr |
A pointer to an int |
| n_bytes |
sizeof(int) |
| dev_info_ptr |
NULL |
Description:
This command performs a flow-control operation on the data stream associated
with the file descriptor passed to devctl().
It's also implemented as the
TCXONC
ioctl() command.
Note:
This command is for internal use, and you shouldn't use it directly.
Instead use the
tcflow()
cover function.
Input:
The action you want to perform (defined in <termios.h>):
- TCOOFF
- Use software flow control to suspend output on the device
associated with the file descriptor.
- TCOOFFHW
- Use hardware flow control to suspend output on the device
associated with the file descriptor.
- TCOON
- Use software flow control to resume output on the device
associated with the file descriptor.
- TCOONHW
- Use hardware flow control to resume output on the device
associated with the file descriptor.
- TCIOFF
- Cause input to be flow-controlled by sending a
STOP character immediately across the communication line associated
with the file descriptor, (that is, software flow control).
- TCIOFFHW
- Cause input to be flow-controlled by using hardware control.
- TCION
- Resume input by sending a START character immediately across
the communication line associated with
the file descriptor (that is, software flow control).
- TCIONHW
- Cause input to be resumed by using hardware flow control.