[bug #63730] The "see" command hangs forever on a default Ubuntu installation

[Jerome Abela]

URL:
  <https://savannah.gnu.org/bugs/?63730>

                 Summary: The "see" command hangs forever on a default Ubuntu
installation
                 Project: Gforth
               Submitter: jeromelon
               Submitted: Mon 30 Jan 2023 02:01:22 PM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any


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Follow-up Comments:


-------------------------------------------------------
Date: Mon 30 Jan 2023 02:01:22 PM UTC By: Jerome Abela <jeromelon>
Steps to reproduce:
  * start gforth
  * run "see +"
The output is:
  Code +  
And then it hangs for ever.

This is due to the default value for /proc/sys/kernel/yama/ptrace_scope (1),
which only allows a process to trace its children, so the attach fails, so the
gdb script fails, so gdb never exits, and gforth waits forever for gdb to
exit.

It would be great to handle this case gracefully, for example by detecting
this case, and showing an error message instead of hanging.








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