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55 lines
1.5 KiB
55 lines
1.5 KiB
#!/usr/bin/env python
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# Copyright (c) PLUMgrid, Inc.
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# Licensed under the Apache License, Version 2.0 (the "License")
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import bcc
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import distutils.version
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import os
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import unittest
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def kernel_version_ge(major, minor):
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# True if running kernel is >= X.Y
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version = distutils.version.LooseVersion(os.uname()[2]).version
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if version[0] > major:
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return True
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if version[0] < major:
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return False
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if minor and version[1] < minor:
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return False
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return True
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@unittest.skipUnless(kernel_version_ge(4,6), "requires kernel >= 4.6")
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class TestStackid(unittest.TestCase):
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def test_simple(self):
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b = bcc.BPF(text="""
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#include <uapi/linux/ptrace.h>
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struct bpf_map;
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BPF_STACK_TRACE(stack_traces, 10240);
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BPF_HASH(stack_entries, int, int);
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BPF_HASH(stub);
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int kprobe__htab_map_lookup_elem(struct pt_regs *ctx, struct bpf_map *map, u64 *k) {
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int id = stack_traces.get_stackid(ctx, BPF_F_REUSE_STACKID);
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if (id < 0)
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return 0;
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int key = 1;
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stack_entries.update(&key, &id);
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return 0;
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}
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""")
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stub = b["stub"]
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stack_traces = b["stack_traces"]
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stack_entries = b["stack_entries"]
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try: x = stub[stub.Key(1)]
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except: pass
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k = stack_entries.Key(1)
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self.assertIn(k, stack_entries)
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stackid = stack_entries[k]
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self.assertIsNotNone(stackid)
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stack = stack_traces[stackid].ip
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self.assertEqual(b.ksym(stack[0]), b"htab_map_lookup_elem")
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if __name__ == "__main__":
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unittest.main()
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