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#!/usr/bin/env python
#
# USAGE: test_usdt3.py
#
# Copyright 2018 Facebook, Inc
# Licensed under the Apache License, Version 2.0 (the "License")
from __future__ import print_function
from bcc import BPF, USDT
from unittest import main, TestCase
from subprocess import Popen, PIPE
import ctypes as ct
import inspect, os, tempfile
class TestUDST(TestCase):
def setUp(self):
common_h = b"""
#include "folly/tracing/StaticTracepoint.h"
static inline void record_val(int val)
{
FOLLY_SDT(test, probe, val);
FOLLY_SDT(test_dup_name, probe, val);
}
extern void record_a(int val);
extern void record_b(int val);
"""
a_c = b"""
#include <stdio.h>
#include "common.h"
void record_a(int val)
{
record_val(val);
}
"""
b_c = b"""
#include <stdio.h>
#include "common.h"
void record_b(int val)
{
record_val(val);
}
"""
m_c = b"""
#include <stdio.h>
#include <unistd.h>
#include "common.h"
int main() {
while (1) {
record_a(1);
record_b(2);
record_val(3);
sleep(1);
}
return 0;
}
"""
# BPF program
self.bpf_text = """
BPF_PERF_OUTPUT(event);
int do_trace(struct pt_regs *ctx) {
int result = 0;
bpf_usdt_readarg(1, ctx, &result);
event.perf_submit(ctx, &result, sizeof(result));
return 0;
};
"""
def _create_file(name, text):
text_file = open(name, "wb")
text_file.write(text)
text_file.close()
# Create source files
self.tmp_dir = tempfile.mkdtemp()
print("temp directory: " + self.tmp_dir)
_create_file(self.tmp_dir + "/common.h", common_h)
_create_file(self.tmp_dir + "/a.cpp", a_c)
_create_file(self.tmp_dir + "/b.cpp", b_c)
_create_file(self.tmp_dir + "/m.cpp", m_c)
# Compilation
# the usdt test:probe exists in liba.so, libb.so and a.out
include_path = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe()))) + "/include"
a_src = self.tmp_dir + "/a.cpp"
a_obj = self.tmp_dir + "/a.o"
a_lib = self.tmp_dir + "/liba.so"
b_src = self.tmp_dir + "/b.cpp"
b_obj = self.tmp_dir + "/b.o"
b_lib = self.tmp_dir + "/libb.so"
m_src = self.tmp_dir + "/m.cpp"
m_bin = self.tmp_dir + "/a.out"
m_linker_opt = " -L" + self.tmp_dir + " -la -lb"
self.assertEqual(os.system("gcc -I" + include_path + " -fpic -c -o " + a_obj + " " + a_src), 0)
self.assertEqual(os.system("gcc -I" + include_path + " -fpic -c -o " + b_obj + " " + b_src), 0)
self.assertEqual(os.system("gcc -shared -o " + a_lib + " " + a_obj), 0)
self.assertEqual(os.system("gcc -shared -o " + b_lib + " " + b_obj), 0)
self.assertEqual(os.system("gcc -I" + include_path + " " + m_src + " -o " + m_bin + m_linker_opt), 0)
# Run the application
self.app = Popen([m_bin], env=dict(os.environ, LD_LIBRARY_PATH=self.tmp_dir))
os.system("../../tools/tplist.py -vvv -p " + str(self.app.pid))
def test_attach1(self):
# enable USDT probe from given PID and verifier generated BPF programs
u = USDT(pid=int(self.app.pid))
u.enable_probe(probe="test:probe", fn_name="do_trace")
b = BPF(text=self.bpf_text, usdt_contexts=[u])
# processing events
self.probe_value_1 = 0
self.probe_value_2 = 0
self.probe_value_3 = 0
self.probe_value_other = 0
def print_event(cpu, data, size):
result = ct.cast(data, ct.POINTER(ct.c_int)).contents
if result.value == 1:
self.probe_value_1 = 1
elif result.value == 2:
self.probe_value_2 = 1
elif result.value == 3:
self.probe_value_3 = 1
else:
self.probe_value_other = 1
b["event"].open_perf_buffer(print_event)
for i in range(100):
if (self.probe_value_1 == 0 or
self.probe_value_2 == 0 or
self.probe_value_3 == 0 or
self.probe_value_other != 0):
b.perf_buffer_poll()
else:
break;
self.assertTrue(self.probe_value_1 != 0)
self.assertTrue(self.probe_value_2 != 0)
self.assertTrue(self.probe_value_3 != 0)
self.assertTrue(self.probe_value_other == 0)
def tearDown(self):
# kill the subprocess, clean the environment
self.app.kill()
self.app.wait()
os.system("rm -rf " + self.tmp_dir)
if __name__ == "__main__":
main()
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