HP 3000 Manuals HP 3000 Manuals
Debug Input/Output - The System Console
Under normal circumstances, Debug Input/Output is typically directed to
the user's terminal. However, during the following occasions, Debug I/O
is redirected to the MPE XL system console:
* During the bootstrap process (until the system is up), all Debug I/O
is directed to the system console.
* All system process debugging uses the system console.
* All job debugging uses the system console. The environment variable
JOB_DEBUG allows jobs to enter Debug.
* The environment variable CONSOLE_DEBUG can be used to cause all
processes that are entering Debug for the first time to use the
system console.
* The environment variable CONSOLE_IO can be used to cause all
debugging for the current process to be directed to the system
console.
* The environment variable TERM_LDEV allows the use of any terminal for
debugging. A privileged procedure, DEBUG_AT_LDEV (ldev : ldev_type),
is also available to enter the debugger and direct I/O to the
specified terminal LDEV.
When Debug is using the system console, the following technique is
recommended to prevent confusion while sharing the console with the CI:
$cmdebug > :restore
Running RESTORE prevents unwanted terminal reads from the console's CI.
See the ENV command for detailed descriptions of all of the environment
variables mentioned above.