Current File : //usr/lib/python3/dist-packages/bcc/utils.py
# Copyright 2016 Catalysts GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import ctypes as ct
import sys
import traceback
import warnings
import re
from .libbcc import lib
def _read_cpu_range(path):
cpus = []
with open(path, 'r') as f:
cpus_range_str = f.read()
for cpu_range in cpus_range_str.split(','):
rangeop = cpu_range.find('-')
if rangeop == -1:
cpus.append(int(cpu_range))
else:
start = int(cpu_range[:rangeop])
end = int(cpu_range[rangeop+1:])
cpus.extend(range(start, end+1))
return cpus
def get_online_cpus():
return _read_cpu_range('/sys/devices/system/cpu/online')
def get_possible_cpus():
return _read_cpu_range('/sys/devices/system/cpu/possible')
def detect_language(candidates, pid):
res = lib.bcc_procutils_language(pid)
language = ct.cast(res, ct.c_char_p).value.decode()
return language if language in candidates else None
FILESYSTEMENCODING = sys.getfilesystemencoding()
def printb(s, file=sys.stdout, nl=1):
"""
printb(s)
print a bytes object to stdout and flush
"""
buf = file.buffer if hasattr(file, "buffer") else file
buf.write(s)
if nl:
buf.write(b"\n")
file.flush()
class ArgString(object):
"""
ArgString(arg)
encapsulate a system argument that can be easily coerced to a bytes()
object, which is better for comparing to kernel or probe data (which should
never be en/decode()'ed).
"""
def __init__(self, arg):
if sys.version_info[0] >= 3:
self.s = arg
else:
self.s = arg.decode(FILESYSTEMENCODING)
def __bytes__(self):
return self.s.encode(FILESYSTEMENCODING)
def __str__(self):
return self.s
def warn_with_traceback(message, category, filename, lineno, file=None, line=None):
log = file if hasattr(file, "write") else sys.stderr
traceback.print_stack(f=sys._getframe(2), file=log)
log.write(warnings.formatwarning(message, category, filename, lineno, line))
# uncomment to get full tracebacks for invalid uses of python3+str in arguments
#warnings.showwarning = warn_with_traceback
_strict_bytes = False
def _assert_is_bytes(arg):
if arg is None:
return arg
if _strict_bytes:
assert type(arg) is bytes, "not a bytes object: %r" % arg
elif type(arg) is not bytes:
warnings.warn("not a bytes object: %r" % arg, DeprecationWarning, 2)
return ArgString(arg).__bytes__()
return arg
class StrcmpRewrite(object):
@staticmethod
def _generate_streq_function(string, probe_read_func, streq_functions,
probeid):
fname = "streq_%d" % probeid
streq_functions += """
static inline bool %s(char const *ignored, uintptr_t str) {
char needle[] = %s;
char haystack[sizeof(needle)];
%s(&haystack, sizeof(haystack), (void *)str);
for (int i = 0; i < sizeof(needle) - 1; ++i) {
if (needle[i] != haystack[i]) {
return false;
}
}
return true;
}
""" % (fname, string, probe_read_func)
return fname, streq_functions
@staticmethod
def rewrite_expr(expr, bin_cmp, is_user, probe_user_list, streq_functions,
probeid):
if bin_cmp:
STRCMP_RE = 'STRCMP\\(\"([^"]+)\\",(.+?)\\)'
else:
STRCMP_RE = 'STRCMP\\(("[^"]+\\"),(.+?)\\)'
matches = re.finditer(STRCMP_RE, expr)
for match in matches:
string = match.group(1)
probe_read_func = "bpf_probe_read"
# if user probe or @user tag is specified, use
# bpf_probe_read_user for char* read
if is_user or \
match.group(2).strip() in probe_user_list:
probe_read_func = "bpf_probe_read_user"
fname, streq_functions = StrcmpRewrite._generate_streq_function(
string, probe_read_func,
streq_functions, probeid)
probeid += 1
expr = expr.replace("STRCMP", fname, 1)
rdict = {
"expr": expr,
"streq_functions": streq_functions,
"probeid": probeid
}
return rdict
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