System information

Rel. 7.0 and 8.0 Red Book for AIX

3. If the tty is still unusable, detach and re-attach the cable from the hung port.

AIX uses the DCD (Data Carrier Detect) signal to determine the presence of a device

attached to the port. Detaching and re-attaching the cable in many cases clears hung

processes.

To determine the location of the port for which the tty is configured, use the following

command:

lsdev -Cl tty0

The third column of the output of this command indicates the address of the tty. In the

following example, s1 indicates that the tty is configured for native serial port 1.

tty0 Available 00-00-s1-00 Asynchronous Terminal

4. It the tty is still unusable, flush the port by using the following command:

/usr/lbin/tty/stty-cxma flush tty0

This command is intended for tty's configured for ports of the 128-port adapter. In some

cases you can use this command to flush other tty ports.

5. If the tty is still unusable, on the keyboard of the hung terminal press the Q key while

holding down the Ctrl key (also known as Ctrl-Q) to resume any suspended output by

sending an Xon character.

6. If the unresponsive tty is on an AIX 4.x system, do the following:

• Enter the following command to get the major and minor numbers of the tty:

ls -l /dev/tty0

The system returns something like the following:

crw--w--w 1 root system 44,129 Aug 28 13:12 /dev/tty0

The major and minor numbers are 44 and 129 respectively.

• Enter the following command to reset this tty:

/usr/sbin/strreset -M 44 -m 129

7. Regardless of the system, if the tty is still unusable, bring the tty down to a DEFINED

state and then make it available. A program will sometimes open a tty port, modify some

attributes, and, when closing the port, not reset those attributes.

Enter the following command to make the tty unavailable to the system, but leave the

information concerning the tty in the database:

rmdev -l tty0

Enter the following command to reactivate the tty and make it available to the system:

mkdev -l tty0