[Bug bpf/27818] New: tapset function pgrp() not working with the bpf runtime

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27818

            Bug ID: 27818
           Summary: tapset function pgrp() not working with the bpf
                    runtime
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bpf
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

The pgrp() tapset function does not work with the bpf runtime:

```
[agentzh@fed32-min ~/git/systemtap.new 0 (master)]$ /opt/stap/bin/stap --bpf -e
'probe oneshot { println(pgrp()) }'
semantic error: unresolved function pgrp (similar: pp, gid, pn, cpu, pid):
identifier 'pgrp' at <input>:1:25
        source: probe oneshot { println(pgrp()) }
                                        ^

Pass 2: analysis failed.  [man error::pass2]
```

while the kernel runtime works:

```
[agentzh@fed32-min ~/git/systemtap.new 1 (master)]$ /opt/stap/bin/stap -e
'probe oneshot { println(pgrp()) }'
83822
```

It'll be great if we can have this covered in ebpf. Thanks!

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