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#!/usr/bin/env python3
# Copyright (c) Suchakra Sharma <suchakrapani.sharma@polymtl.ca>
# Licensed under the Apache License, Version 2.0 (the "License")
from bcc import BPF, _get_num_open_probes, TRACEFS
import os
import sys
from unittest import main, TestCase
class TestKprobeCnt(TestCase):
def setUp(self):
self.b = BPF(text=b"""
int wololo(void *ctx) {
return 0;
}
""")
self.b.attach_kprobe(event_re=b"^vfs_.*", fn_name=b"wololo")
def test_attach1(self):
actual_cnt = 0
with open("%s/available_filter_functions" % TRACEFS, "rb") as f:
for line in f:
if line.startswith(b"vfs_"):
actual_cnt += 1
open_cnt = self.b.num_open_kprobes()
self.assertEqual(actual_cnt, open_cnt)
def tearDown(self):
self.b.cleanup()
class TestProbeGlobalCnt(TestCase):
def setUp(self):
self.b1 = BPF(text=b"""int count(void *ctx) { return 0; }""")
self.b2 = BPF(text=b"""int count(void *ctx) { return 0; }""")
def test_probe_quota(self):
self.b1.attach_kprobe(event=b"schedule", fn_name=b"count")
self.b2.attach_kprobe(event=b"submit_bio", fn_name=b"count")
self.assertEqual(1, self.b1.num_open_kprobes())
self.assertEqual(1, self.b2.num_open_kprobes())
self.assertEqual(2, _get_num_open_probes())
self.b1.cleanup()
self.b2.cleanup()
self.assertEqual(0, _get_num_open_probes())
class TestAutoKprobe(TestCase):
def setUp(self):
self.b = BPF(text=b"""
int kprobe__schedule(void *ctx) { return 0; }
int kretprobe__schedule(void *ctx) { return 0; }
""")
def test_count(self):
self.assertEqual(2, self.b.num_open_kprobes())
def tearDown(self):
self.b.cleanup()
class TestProbeQuota(TestCase):
def setUp(self):
self.b = BPF(text=b"""int count(void *ctx) { return 0; }""")
def test_probe_quota(self):
with self.assertRaises(Exception):
self.b.attach_kprobe(event_re=b".*", fn_name=b"count")
def test_uprobe_quota(self):
with self.assertRaises(Exception):
self.b.attach_uprobe(name=b"c", sym_re=b".*", fn_name=b"count")
def tearDown(self):
self.b.cleanup()
class TestProbeNotExist(TestCase):
def setUp(self):
self.b = BPF(text=b"""int count(void *ctx) { return 0; }""")
def test_not_exist(self):
with self.assertRaises(Exception):
self.b.attach_kprobe(event=b"___doesnotexist", fn_name=b"count")
def tearDown(self):
self.b.cleanup()
if __name__ == "__main__":
main()
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