ZCOM C I/F Library Routines
ZCNTL (3X)
Modes 5 and 7 are only meaningful when rcode is 3.
Some bits (when set) in the mode parameter can cause zcntl to behave differently. Refer to the NOTES section in zsend(3X) for details.
rcode | Control request code: |
|
| ZCOM_MRQCODE_CNTWR | (3) - Control write (length in len) |
| ZCOM_MRQCODE_TERM | (6) - Set terminal parameters |
| ZCOM_MRQCODE_ENB | (7) - Enable terminal |
| ZCOM_MRQCODE_DSB | (8) - Disable terminal |
| ZCOM_MRQCODE_ACT | (9) - Activate polling |
| ZCOM_MRQCODE_DEA | (10) - Deactivate pollin |
| To operate normally, a terminal ZLU must be enabled | |
| (rcode=ZCOM_MRQCODE_ENB) and activated | |
| (rcode=ZCOM_MRQCODE_ACT). If the terminal ZLU is deactivated | |
| (rcode=ZCOM_MRQCODE_DEA), the ZCOM subsystem cannot receive | |
| incoming messages from that terminal (used for | |
| disabled (rcode=ZCOM_MRQCODE_DSB), data messages can neither be | |
| sent nor received from the terminal. | |
| Request ZCOM_MRQCODE_TERM is used to configure a terminal with | |
| new parameters, which are protocol dependent. Control write request | |
| ZCOM_MRQCODE_CNTWR provides a means of passing protocol | |
| specific control information to a terminal. These two requests require | |
| setting up the ibuf and len parameters. | |
mhp | Pointer to message header. It contains some data fields to be sent with | |
| the data message. See the NOTES section in zsend(3X) for what fields | |
| must be set up by the caller. If NULL is specified, default values are used. | |
For its structure, refer to the subsection on ‘Message Header’ in the
172 | Chapter 4 |