Using GDB as a Python interpreter

[Florian Weimer via Gdb <gdb@sourceware.org>]

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

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