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# Verify that systemtap static probes work
#
import subprocess
import sys
import sysconfig
import os
import unittest
from test.support import run_unittest, TESTFN, unlink
if '--with-systemtap' not in sysconfig.get_config_var('CONFIG_ARGS'):
raise unittest.SkipTest("Python was not configured --with-systemtap")
try:
_, stap_version = subprocess.Popen(["stap", "-V"],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
).communicate()
except OSError:
# This is what "no stap" looks like. There may, however, be other
# errors that manifest this way too.
raise unittest.SkipTest("Couldn't find stap on the path")
def invoke_systemtap_script(script, cmd):
# Start a child process, probing with the given systemtap script
# (passed as stdin to the "stap" tool)
# The script should be a bytes instance
# Return (stdout, stderr) pair
p = subprocess.Popen(["stap", "-", '-vv', '-c', cmd],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, err = p.communicate(input=script)
return out, err
# Verify that stap can run a simple "hello world"-style script
# This can fail for various reasons:
# - missing kernel headers
# - permissions (a non-root user needs to be in the "stapdev" group)
TRIVIAL_STAP_SCRIPT = b'probe begin { println("hello world") exit () }'
out, err = invoke_systemtap_script(TRIVIAL_STAP_SCRIPT, 'true')
if out != b'hello world\n':
raise unittest.SkipTest("Test systemtap script did not run; stderr was: %s" % err)
# We don't expect stderr to be empty, since we're invoking stap with "-vv": stap
# will (we hope) generate debugging output on stderr.
def invoke_python_under_systemtap(script, pythoncode=None, pythonfile=None):
# Start a child python process, probing with the given systemtap script
# (passed as stdin to the "stap" tool)
# The script should be a bytes instance
# Return (stdout, stderr) pair
if pythonfile:
pythoncmd = '%s %s' % (sys.executable, pythonfile)
else:
pythoncmd = '%s -c %r' % (sys.executable, pythoncode)
# The process tree of a stap invocation of a command goes through
# something like this:
# stap ->fork/exec(staprun; exec stapio ->f/e(-c cmd); exec staprun -r)
# and this trip through setuid leads to LD_LIBRARY_PATH being dropped,
# which would lead to an --enable-shared build of python failing to be
# find its libpython, with an error like:
# error while loading shared libraries: libpython3.3dm.so.1.0: cannot
# open shared object file: No such file or directory
# Hence we need to jump through some hoops to expose LD_LIBRARY_PATH to
# the invoked python process:
LD_LIBRARY_PATH = os.environ.get('LD_LIBRARY_PATH', '')
if LD_LIBRARY_PATH:
pythoncmd = 'env LD_LIBRARY_PATH=%s ' % LD_LIBRARY_PATH + pythoncmd
return invoke_systemtap_script(script, pythoncmd)
# When using the static markers, we need to supply the prefix of a systemtap
# dotted probe point that containing the marker.
# See http://sourceware.org/systemtap/langref/Probe_points.html
#
# We need to determine if this is a shared-library build
#
# Note that sysconfig can get this wrong; see:
# http://bugs.python.org/issue14774
#
if '--enable-shared' in sysconfig.get_config_var('CONFIG_ARGS'):
# For a shared-library build, the markers are in library(INSTSONAME):
INSTSONAME = sysconfig.get_config_var('INSTSONAME')
probe_prefix = 'process("%s").library("%s")' % (sys.executable, INSTSONAME)
else:
# For a non-shared-library build, we can simply use sys.executable:
probe_prefix = 'process("%s")' % sys.executable
# The following script ought to generate lots of lines showing recursive
# function entry and return, of the form:
# 11408 python(8274): => __contains__ in Lib/_abcoll.py:362
# 11414 python(8274): => __getitem__ in Lib/os.py:425
# 11418 python(8274): => encode in Lib/os.py:490
# 11424 python(8274): <= encode in Lib/os.py:493
# 11428 python(8274): <= __getitem__ in Lib/os.py:426
# 11433 python(8274): <= __contains__ in Lib/_abcoll.py:366
# where the column are:
# - time in microseconds since start of script
# - name of executable
# - PID of process
# and the remainder indicates the call/return hierarchy
hierarchy_script = ('''
probe %s.mark("function__entry") {
filename = user_string($arg1);
funcname = user_string($arg2);
lineno = $arg3;
printf("%%s => %%s in %%s:%%d\\n", thread_indent(1), funcname, filename, lineno);
}
probe %s.mark("function__return") {
filename = user_string($arg1);
funcname = user_string($arg2);
lineno = $arg3;
printf("%%s <= %%s in %%s:%%d\\n", thread_indent(-1), funcname, filename, lineno);
}
''' % (probe_prefix, probe_prefix)).encode('utf-8')
class ErrorDumper:
# A context manager that dumps extra information if an exception is raised,
# to help track down why the problem occurred
def __init__(self, out, err):
self.out = out
self.err = err
def __enter__(self):
pass
def __exit__(self, type_, value, traceback):
if type_:
# an exception is being raised:
print('stdout: %s' % out.decode())
print('stderr: %s' % err.decode())
class SystemtapTests(unittest.TestCase):
def test_invoking_python(self):
# Ensure that we can invoke python under stap, with a trivial stap
# script:
out, err = invoke_python_under_systemtap(
b'probe begin { println("hello from stap") exit () }',
pythoncode="print('hello from python')")
with ErrorDumper(out, err):
self.assertIn(b'hello from stap', out)
self.assertIn(b'hello from python', out)
def test_function_entry(self):
# Ensure that the function_entry static marker works
out, err = invoke_python_under_systemtap(hierarchy_script)
# stdout ought to contain various lines showing recursive function
# entry and return (see above)
# Uncomment this for debugging purposes:
# print(out.decode('utf-8'))
# Executing the cmdline-supplied "pass":
# 0 python(8274): => <module> in <string>:1
# 5 python(8274): <= <module> in <string>:1
with ErrorDumper(out, err):
self.assertIn(b'=> <module> in <string>:1', out,
msg="stdout: %s\nstderr: %s\n" % (out, err))
def test_function_encoding(self):
# Ensure that function names containing non-Latin 1 code
# points are handled:
pythonfile = TESTFN
try:
unlink(pythonfile)
f = open(pythonfile, "wb")
f.write("""
# Sample script with non-ASCII filename, for use by test_systemtap.py
# Implicitly UTF-8
def 文字化け():
'''Function with non-ASCII identifier; I believe this reads "mojibake"'''
print("hello world!")
文字化け()
""".encode('utf-8'))
f.close()
out, err = invoke_python_under_systemtap(hierarchy_script,
pythonfile=pythonfile)
out_utf8 = out.decode('utf-8')
with ErrorDumper(out, err):
self.assertIn('=> <module> in %s:5' % pythonfile, out_utf8)
self.assertIn(' => 文字化け in %s:5' % pythonfile, out_utf8)
self.assertIn(' <= 文字化け in %s:7' % pythonfile, out_utf8)
self.assertIn('<= <module> in %s:9' % pythonfile, out_utf8)
finally:
unlink(pythonfile)
@unittest.skipIf(sys.getfilesystemencoding() == 'ascii',
'the test filename is not encodable with ASCII')
def test_filename_encoding(self):
# Ensure that scripts names containing non-Latin 1 code
# points are handled:
pythonfile = TESTFN + '_☠.py'
try:
unlink(pythonfile)
f = open(pythonfile, "wb")
f.write("""
def foo():
'''Function with non-ASCII identifier; I believe this reads "mojibake"'''
print("hello world!")
foo()
""".encode('utf-8'))
f.close()
out, err = invoke_python_under_systemtap(hierarchy_script,
pythonfile=pythonfile)
out_utf8 = out.decode('utf-8')
with ErrorDumper(out, err):
self.assertIn('=> <module> in %s:2' % pythonfile, out_utf8)
self.assertIn(' => foo in %s:2' % pythonfile, out_utf8)
self.assertIn(' <= foo in %s:4' % pythonfile, out_utf8)
self.assertIn('<= <module> in %s:6' % pythonfile, out_utf8)
finally:
unlink(pythonfile)
def test_main():
run_unittest(SystemtapTests)
if __name__ == "__main__":
test_main()