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From: Florian Weimer <fweimer@redhat.com>
To: gdb@sourceware.org
Subject: Using GDB as a Python interpreter
Date: Sat, 01 Jul 2023 10:53:10 +0200
Message-ID: <87sfa8vwqx.fsf@oldenburg.str.redhat.com>
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I want to run a Python script with GDB, from the shell command line,
without having to create two files.

I came up with the hack included below, but it's not particularly nice.
The downside is that the script file name must end in =E2=80=9C.py=E2=80=9D=
, which would
not allow to install the script in /usr/bin for most distributions.  I
don't see a way to override that.

Thanks,
Florian

#!/usr/bin/python

if 'gdb' not in globals():
    import sys
    import os

    pid, =3D sys.argv[1:]
    os.execvp('gdb', [
        'gdb', '--batch',
        '-ex', 'set debuginfod enabled off',
        '-ex', 'attach ' + pid,
        '-x', __file__,
    ])

dl_ns =3D gdb.lookup_global_symbol('_rtld_global').value()['_dl_ns']
nsid_min, nsid_max =3D dl_ns.type.range()
for nsid in range(nsid_min, nsid_max + 1):
    l =3D dl_ns[nsid]['_ns_loaded']
    if not l:
        continue
    print('namespace', nsid)
    while l:
        print('  {!r}'.format(l['l_name'].string()))
        ln =3D l['l_libname']
        while ln:
            print('    alias {!r}'.format(ln['name'].string()))
            ln =3D ln['next']
        l =3D l['l_next']