/usr/lib/python3.7/ctypes/util.py is in libpython3.7-stdlib 3.7.0~b3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 | import os
import shutil
import subprocess
import sys
# find_library(name) returns the pathname of a library, or None.
if os.name == "nt":
def _get_build_version():
"""Return the version of MSVC that was used to build Python.
For Python 2.3 and up, the version number is included in
sys.version. For earlier versions, assume the compiler is MSVC 6.
"""
# This function was copied from Lib/distutils/msvccompiler.py
prefix = "MSC v."
i = sys.version.find(prefix)
if i == -1:
return 6
i = i + len(prefix)
s, rest = sys.version[i:].split(" ", 1)
majorVersion = int(s[:-2]) - 6
if majorVersion >= 13:
majorVersion += 1
minorVersion = int(s[2:3]) / 10.0
# I don't think paths are affected by minor version in version 6
if majorVersion == 6:
minorVersion = 0
if majorVersion >= 6:
return majorVersion + minorVersion
# else we don't know what version of the compiler this is
return None
def find_msvcrt():
"""Return the name of the VC runtime dll"""
version = _get_build_version()
if version is None:
# better be safe than sorry
return None
if version <= 6:
clibname = 'msvcrt'
elif version <= 13:
clibname = 'msvcr%d' % (version * 10)
else:
# CRT is no longer directly loadable. See issue23606 for the
# discussion about alternative approaches.
return None
# If python was built with in debug mode
import importlib.machinery
if '_d.pyd' in importlib.machinery.EXTENSION_SUFFIXES:
clibname += 'd'
return clibname+'.dll'
def find_library(name):
if name in ('c', 'm'):
return find_msvcrt()
# See MSDN for the REAL search order.
for directory in os.environ['PATH'].split(os.pathsep):
fname = os.path.join(directory, name)
if os.path.isfile(fname):
return fname
if fname.lower().endswith(".dll"):
continue
fname = fname + ".dll"
if os.path.isfile(fname):
return fname
return None
if os.name == "posix" and sys.platform == "darwin":
from ctypes.macholib.dyld import dyld_find as _dyld_find
def find_library(name):
possible = ['lib%s.dylib' % name,
'%s.dylib' % name,
'%s.framework/%s' % (name, name)]
for name in possible:
try:
return _dyld_find(name)
except ValueError:
continue
return None
if sys.platform.startswith("aix"):
# AIX has two styles of storing shared libraries
# GNU auto_tools refer to these as svr4 and aix
# svr4 (System V Release 4) is a regular file, often with .so as suffix
# AIX style uses an archive (suffix .a) with members (e.g., shr.o, libssl.so)
# see issue#26439 and _aix.py for more details
from ctypes._aix import find_library
elif os.name == "posix":
# Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
import re, tempfile
def _findLib_gcc(name):
# Run GCC's linker with the -t (aka --trace) option and examine the
# library name it prints out. The GCC command will fail because we
# haven't supplied a proper program with main(), but that does not
# matter.
expr = os.fsencode(r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name))
c_compiler = shutil.which('gcc')
if not c_compiler:
c_compiler = shutil.which('cc')
if not c_compiler:
# No C compiler available, give up
return None
temp = tempfile.NamedTemporaryFile()
try:
args = [c_compiler, '-Wl,-t', '-o', temp.name, '-l' + name]
env = dict(os.environ)
env['LC_ALL'] = 'C'
env['LANG'] = 'C'
try:
proc = subprocess.Popen(args,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
env=env)
except OSError: # E.g. bad executable
return None
with proc:
trace = proc.stdout.read()
finally:
try:
temp.close()
except FileNotFoundError:
# Raised if the file was already removed, which is the normal
# behaviour of GCC if linking fails
pass
res = re.search(expr, trace)
if not res:
return None
return os.fsdecode(res.group(0))
if sys.platform == "sunos5":
# use /usr/ccs/bin/dump on solaris
def _get_soname(f):
if not f:
return None
try:
proc = subprocess.Popen(("/usr/ccs/bin/dump", "-Lpv", f),
stdout=subprocess.PIPE,
stderr=subprocess.DEVNULL)
except OSError: # E.g. command not found
return None
with proc:
data = proc.stdout.read()
res = re.search(br'\[.*\]\sSONAME\s+([^\s]+)', data)
if not res:
return None
return os.fsdecode(res.group(1))
else:
def _get_soname(f):
# assuming GNU binutils / ELF
if not f:
return None
objdump = shutil.which('objdump')
if not objdump:
# objdump is not available, give up
return None
try:
proc = subprocess.Popen((objdump, '-p', '-j', '.dynamic', f),
stdout=subprocess.PIPE,
stderr=subprocess.DEVNULL)
except OSError: # E.g. bad executable
return None
with proc:
dump = proc.stdout.read()
res = re.search(br'\sSONAME\s+([^\s]+)', dump)
if not res:
return None
return os.fsdecode(res.group(1))
if sys.platform.startswith(("freebsd", "openbsd", "dragonfly")):
def _num_version(libname):
# "libxyz.so.MAJOR.MINOR" => [ MAJOR, MINOR ]
parts = libname.split(b".")
nums = []
try:
while parts:
nums.insert(0, int(parts.pop()))
except ValueError:
pass
return nums or [sys.maxsize]
def find_library(name):
ename = re.escape(name)
expr = r':-l%s\.\S+ => \S*/(lib%s\.\S+)' % (ename, ename)
expr = os.fsencode(expr)
try:
proc = subprocess.Popen(('/sbin/ldconfig', '-r'),
stdout=subprocess.PIPE,
stderr=subprocess.DEVNULL)
except OSError: # E.g. command not found
data = b''
else:
with proc:
data = proc.stdout.read()
res = re.findall(expr, data)
if not res:
return _get_soname(_findLib_gcc(name))
res.sort(key=_num_version)
return os.fsdecode(res[-1])
elif sys.platform == "sunos5":
def _findLib_crle(name, is64):
if not os.path.exists('/usr/bin/crle'):
return None
env = dict(os.environ)
env['LC_ALL'] = 'C'
if is64:
args = ('/usr/bin/crle', '-64')
else:
args = ('/usr/bin/crle',)
paths = None
try:
proc = subprocess.Popen(args,
stdout=subprocess.PIPE,
stderr=subprocess.DEVNULL,
env=env)
except OSError: # E.g. bad executable
return None
with proc:
for line in proc.stdout:
line = line.strip()
if line.startswith(b'Default Library Path (ELF):'):
paths = os.fsdecode(line).split()[4]
if not paths:
return None
for dir in paths.split(":"):
libfile = os.path.join(dir, "lib%s.so" % name)
if os.path.exists(libfile):
return libfile
return None
def find_library(name, is64 = False):
return _get_soname(_findLib_crle(name, is64) or _findLib_gcc(name))
else:
def _findSoname_ldconfig(name):
import struct
# XXX this code assumes that we know all unames and that a single
# ABI is supported per uname; instead we should find what the
# ABI is (e.g. check ABI of current process) or simply ask libc
# to load the library for us
uname = os.uname()
# ARM has a variety of unames, e.g. armv7l
if uname.machine.startswith("arm"):
machine = "arm"
if struct.calcsize('l') == 4:
machine = uname.machine + '-32'
else:
machine = uname.machine + '-64'
mach_map = {
'x86_64-64': 'libc6,x86-64',
'ppc64-64': 'libc6,64bit',
'sparc64-64': 'libc6,64bit',
's390x-64': 'libc6,64bit',
'ia64-64': 'libc6,IA-64',
# this actually breaks on biarch or multiarch as the first
# library wins; uname doesn't tell us which ABI we're using
'arm-32': 'libc6(,hard-float)?',
}
abi_type = mach_map.get(machine, 'libc6')
# XXX assuming GLIBC's ldconfig (with option -p)
regex = r'\s+(lib%s\.[^\s]+)\s+\(%s'
regex = os.fsencode(regex % (re.escape(name), abi_type))
try:
with subprocess.Popen(['/sbin/ldconfig', '-p'],
stdin=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
stdout=subprocess.PIPE,
env={'LC_ALL': 'C', 'LANG': 'C'}) as p:
res = re.search(regex, p.stdout.read())
if res:
return os.fsdecode(res.group(1))
except OSError:
pass
def _findLib_ld(name):
# See issue #9998 for why this is needed
expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
cmd = ['ld', '-t']
libpath = os.environ.get('LD_LIBRARY_PATH')
if libpath:
for d in libpath.split(':'):
cmd.extend(['-L', d])
cmd.extend(['-o', os.devnull, '-l%s' % name])
result = None
try:
p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True)
out, _ = p.communicate()
res = re.search(expr, os.fsdecode(out))
if res:
result = res.group(0)
except Exception as e:
pass # result will be None
return result
def find_library(name):
# See issue #9998
return _findSoname_ldconfig(name) or \
_get_soname(_findLib_gcc(name) or _findLib_ld(name))
################################################################
# test code
def test():
from ctypes import cdll
if os.name == "nt":
print(cdll.msvcrt)
print(cdll.load("msvcrt"))
print(find_library("msvcrt"))
if os.name == "posix":
# find and load_version
print(find_library("m"))
print(find_library("c"))
print(find_library("bz2"))
# load
if sys.platform == "darwin":
print(cdll.LoadLibrary("libm.dylib"))
print(cdll.LoadLibrary("libcrypto.dylib"))
print(cdll.LoadLibrary("libSystem.dylib"))
print(cdll.LoadLibrary("System.framework/System"))
# issue-26439 - fix broken test call for AIX
elif sys.platform.startswith("aix"):
from ctypes import CDLL
if sys.maxsize < 2**32:
print(f"Using CDLL(name, os.RTLD_MEMBER): {CDLL('libc.a(shr.o)', os.RTLD_MEMBER)}")
print(f"Using cdll.LoadLibrary(): {cdll.LoadLibrary('libc.a(shr.o)')}")
# librpm.so is only available as 32-bit shared library
print(find_library("rpm"))
print(cdll.LoadLibrary("librpm.so"))
else:
print(f"Using CDLL(name, os.RTLD_MEMBER): {CDLL('libc.a(shr_64.o)', os.RTLD_MEMBER)}")
print(f"Using cdll.LoadLibrary(): {cdll.LoadLibrary('libc.a(shr_64.o)')}")
print(f"crypt\t:: {find_library('crypt')}")
print(f"crypt\t:: {cdll.LoadLibrary(find_library('crypt'))}")
print(f"crypto\t:: {find_library('crypto')}")
print(f"crypto\t:: {cdll.LoadLibrary(find_library('crypto'))}")
else:
print(cdll.LoadLibrary("libm.so"))
print(cdll.LoadLibrary("libcrypt.so"))
print(find_library("crypt"))
if __name__ == "__main__":
test()
|