Mercurial > cpython-lru_cache-weakref

annotate Lib/ctypes/util.py @ 79691:05c8928362ee

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Merge __next__ method link fixes with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 12 Oct 2012 13:46:37 +0300
parents 460407f35aa9
children 73574de2068b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 import sys, os
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2 import contextlib
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19d9f0a177de Issue #11258: Speed up ctypes.util.find_library() under Linux by a factor
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3 import subprocess
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4
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5 # find_library(name) returns the pathname of a library, or None.
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6 if os.name == "nt":
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7
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8 def _get_build_version():
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9 """Return the version of MSVC that was used to build Python.
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10
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11 For Python 2.3 and up, the version number is included in
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12 sys.version. For earlier versions, assume the compiler is MSVC 6.
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13 """
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14 # This function was copied from Lib/distutils/msvccompiler.py
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15 prefix = "MSC v."
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16 i = sys.version.find(prefix)
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17 if i == -1:
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18 return 6
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19 i = i + len(prefix)
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20 s, rest = sys.version[i:].split(" ", 1)
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21 majorVersion = int(s[:-2]) - 6
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22 minorVersion = int(s[2:3]) / 10.0
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23 # I don't think paths are affected by minor version in version 6
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24 if majorVersion == 6:
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25 minorVersion = 0
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26 if majorVersion >= 6:
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27 return majorVersion + minorVersion
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28 # else we don't know what version of the compiler this is
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29 return None
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30
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31 def find_msvcrt():
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32 """Return the name of the VC runtime dll"""
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33 version = _get_build_version()
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34 if version is None:
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35 # better be safe than sorry
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36 return None
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37 if version <= 6:
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38 clibname = 'msvcrt'
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39 else:
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40 clibname = 'msvcr%d' % (version * 10)
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41
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42 # If python was built with in debug mode
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43 import importlib.machinery
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44 if '_d.pyd' in importlib.machinery.EXTENSION_SUFFIXES:
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45 clibname += 'd'
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46 return clibname+'.dll'
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47
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48 def find_library(name):
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49 if name in ('c', 'm'):
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50 return find_msvcrt()
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51 # See MSDN for the REAL search order.
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52 for directory in os.environ['PATH'].split(os.pathsep):
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53 fname = os.path.join(directory, name)
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54 if os.path.isfile(fname):
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55 return fname
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56 if fname.lower().endswith(".dll"):
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57 continue
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58 fname = fname + ".dll"
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59 if os.path.isfile(fname):
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60 return fname
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61 return None
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62
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63 if os.name == "ce":
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64 # search path according to MSDN:
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65 # - absolute path specified by filename
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66 # - The .exe launch directory
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67 # - the Windows directory
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68 # - ROM dll files (where are they?)
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69 # - OEM specified search path: HKLM\Loader\SystemPath
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70 def find_library(name):
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71 return name
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72
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73 if os.name == "posix" and sys.platform == "darwin":
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74 from ctypes.macholib.dyld import dyld_find as _dyld_find
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75 def find_library(name):
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76 possible = ['lib%s.dylib' % name,
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77 '%s.dylib' % name,
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78 '%s.framework/%s' % (name, name)]
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79 for name in possible:
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80 try:
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81 return _dyld_find(name)
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82 except ValueError:
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83 continue
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84 return None
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85
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86 elif os.name == "posix":
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87 # Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
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88 import re, tempfile, errno
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89
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90 def _findLib_gcc(name):
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91 expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
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92 fdout, ccout = tempfile.mkstemp()
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93 os.close(fdout)
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94 cmd = 'if type gcc >/dev/null 2>&1; then CC=gcc; elif type cc >/dev/null 2>&1; then CC=cc;else exit 10; fi;' \
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95 '$CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
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96 try:
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97 f = os.popen(cmd)
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98 try:
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99 trace = f.read()
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100 finally:
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101 rv = f.close()
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102 finally:
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103 try:
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104 os.unlink(ccout)
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105 except OSError as e:
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106 if e.errno != errno.ENOENT:
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107 raise
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108 if rv == 10:
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109 raise OSError('gcc or cc command not found')
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110 res = re.search(expr, trace)
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111 if not res:
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112 return None
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113 return res.group(0)
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114
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115
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116 if sys.platform == "sunos5":
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117 # use /usr/ccs/bin/dump on solaris
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118 def _get_soname(f):
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119 if not f:
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120 return None
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121 cmd = "/usr/ccs/bin/dump -Lpv 2>/dev/null " + f
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122 with contextlib.closing(os.popen(cmd)) as f:
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123 data = f.read()
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124 res = re.search(r'\[.*\]\sSONAME\s+([^\s]+)', data)
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125 if not res:
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126 return None
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127 return res.group(1)
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128 else:
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129 def _get_soname(f):
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130 # assuming GNU binutils / ELF
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131 if not f:
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132 return None
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133 cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
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134 "objdump -p -j .dynamic 2>/dev/null " + f
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135 f = os.popen(cmd)
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136 dump = f.read()
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137 rv = f.close()
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138 if rv == 10:
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139 raise OSError('objdump command not found')
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140 res = re.search(r'\sSONAME\s+([^\s]+)', dump)
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141 if not res:
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142 return None
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143 return res.group(1)
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144
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145 if sys.platform.startswith(("freebsd", "openbsd", "dragonfly")):
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146
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147 def _num_version(libname):
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148 # "libxyz.so.MAJOR.MINOR" => [ MAJOR, MINOR ]
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149 parts = libname.split(".")
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150 nums = []
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151 try:
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152 while parts:
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153 nums.insert(0, int(parts.pop()))
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154 except ValueError:
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155 pass
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156 return nums or [ sys.maxsize ]
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157
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158 def find_library(name):
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159 ename = re.escape(name)
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160 expr = r':-l%s\.\S+ => \S*/(lib%s\.\S+)' % (ename, ename)
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161 with contextlib.closing(os.popen('/sbin/ldconfig -r 2>/dev/null')) as f:
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162 data = f.read()
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163 res = re.findall(expr, data)
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164 if not res:
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165 return _get_soname(_findLib_gcc(name))
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166 res.sort(key=_num_version)
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167 return res[-1]
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168
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169 else:
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170
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171 def _findSoname_ldconfig(name):
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172 import struct
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173 if struct.calcsize('l') == 4:
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174 machine = os.uname().machine + '-32'
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175 else:
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176 machine = os.uname().machine + '-64'
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177 mach_map = {
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178 'x86_64-64': 'libc6,x86-64',
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179 'ppc64-64': 'libc6,64bit',
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180 'sparc64-64': 'libc6,64bit',
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181 's390x-64': 'libc6,64bit',
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182 'ia64-64': 'libc6,IA-64',
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183 }
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184 abi_type = mach_map.get(machine, 'libc6')
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185
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186 # XXX assuming GLIBC's ldconfig (with option -p)
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187 regex = os.fsencode(
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188 '\s+(lib%s\.[^\s]+)\s+\(%s' % (re.escape(name), abi_type))
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189 try:
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190 with subprocess.Popen(['/sbin/ldconfig', '-p'],
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191 stdin=subprocess.DEVNULL,
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192 stderr=subprocess.DEVNULL,
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193 stdout=subprocess.PIPE,
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194 env={'LC_ALL': 'C', 'LANG': 'C'}) as p:
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195 res = re.search(regex, p.stdout.read())
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196 if res:
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197 return os.fsdecode(res.group(1))
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198 except OSError:
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199 pass
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200
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201 def find_library(name):
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202 return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(name))
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203
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204 ################################################################
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205 # test code
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206
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207 def test():
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208 from ctypes import cdll
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209 if os.name == "nt":
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210 print(cdll.msvcrt)
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211 print(cdll.load("msvcrt"))
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212 print(find_library("msvcrt"))
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213
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214 if os.name == "posix":
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215 # find and load_version
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216 print(find_library("m"))
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217 print(find_library("c"))
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218 print(find_library("bz2"))
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219
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220 # getattr
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221 ## print cdll.m
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222 ## print cdll.bz2
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223
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224 # load
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225 if sys.platform == "darwin":
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226 print(cdll.LoadLibrary("libm.dylib"))
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227 print(cdll.LoadLibrary("libcrypto.dylib"))
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228 print(cdll.LoadLibrary("libSystem.dylib"))
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229 print(cdll.LoadLibrary("System.framework/System"))
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230 else:
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231 print(cdll.LoadLibrary("libm.so"))
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232 print(cdll.LoadLibrary("libcrypt.so"))
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233 print(find_library("crypt"))
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234
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235 if __name__ == "__main__":
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236 test()