Mercurial > cpython-lru_cache-weakref

annotate Lib/ctypes/util.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents ac362fb3b86b
children 096e856a01aa
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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3
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4 # find_library(name) returns the pathname of a library, or None.
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5 if os.name == "nt":
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6
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7 def _get_build_version():
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8 """Return the version of MSVC that was used to build Python.
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9
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10 For Python 2.3 and up, the version number is included in
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11 sys.version. For earlier versions, assume the compiler is MSVC 6.
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12 """
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13 # This function was copied from Lib/distutils/msvccompiler.py
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14 prefix = "MSC v."
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15 i = sys.version.find(prefix)
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16 if i == -1:
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17 return 6
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18 i = i + len(prefix)
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19 s, rest = sys.version[i:].split(" ", 1)
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20 majorVersion = int(s[:-2]) - 6
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21 minorVersion = int(s[2:3]) / 10.0
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22 # I don't think paths are affected by minor version in version 6
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23 if majorVersion == 6:
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24 minorVersion = 0
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25 if majorVersion >= 6:
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26 return majorVersion + minorVersion
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27 # else we don't know what version of the compiler this is
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28 return None
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29
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30 def find_msvcrt():
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31 """Return the name of the VC runtime dll"""
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32 version = _get_build_version()
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33 if version is None:
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34 # better be safe than sorry
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35 return None
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36 if version <= 6:
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37 clibname = 'msvcrt'
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38 else:
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39 clibname = 'msvcr%d' % (version * 10)
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40
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41 # If python was built with in debug mode
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42 import imp
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43 if imp.get_suffixes()[0][0] == '_d.pyd':
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44 clibname += 'd'
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45 return clibname+'.dll'
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46
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47 def find_library(name):
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48 if name in ('c', 'm'):
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49 return find_msvcrt()
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50 # See MSDN for the REAL search order.
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51 for directory in os.environ['PATH'].split(os.pathsep):
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52 fname = os.path.join(directory, name)
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53 if os.path.isfile(fname):
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54 return fname
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55 if fname.lower().endswith(".dll"):
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56 continue
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57 fname = fname + ".dll"
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58 if os.path.isfile(fname):
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59 return fname
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60 return None
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61
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62 if os.name == "ce":
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63 # search path according to MSDN:
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64 # - absolute path specified by filename
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65 # - The .exe launch directory
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66 # - the Windows directory
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67 # - ROM dll files (where are they?)
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68 # - OEM specified search path: HKLM\Loader\SystemPath
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69 def find_library(name):
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70 return name
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71
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72 if os.name == "posix" and sys.platform == "darwin":
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73 from ctypes.macholib.dyld import dyld_find as _dyld_find
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74 def find_library(name):
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75 possible = ['lib%s.dylib' % name,
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76 '%s.dylib' % name,
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77 '%s.framework/%s' % (name, name)]
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78 for name in possible:
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79 try:
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80 return _dyld_find(name)
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81 except ValueError:
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82 continue
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83 return None
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84
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85 elif os.name == "posix":
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86 # Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
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87 import re, tempfile, errno
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88
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89 def _findLib_gcc(name):
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90 expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
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91 fdout, ccout = tempfile.mkstemp()
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92 os.close(fdout)
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93 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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94 '$CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
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95 try:
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96 f = os.popen(cmd)
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97 try:
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98 trace = f.read()
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99 finally:
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100 rv = f.close()
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101 finally:
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102 try:
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103 os.unlink(ccout)
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104 except OSError as e:
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105 if e.errno != errno.ENOENT:
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106 raise
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107 if rv == 10:
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108 raise OSError('gcc or cc command not found')
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109 res = re.search(expr, trace)
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110 if not res:
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111 return None
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112 return res.group(0)
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113
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114
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115 if sys.platform == "sunos5":
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116 # use /usr/ccs/bin/dump on solaris
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117 def _get_soname(f):
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118 if not f:
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119 return None
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120 cmd = "/usr/ccs/bin/dump -Lpv 2>/dev/null " + f
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121 with contextlib.closing(os.popen(cmd)) as f:
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122 data = f.read()
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123 res = re.search(r'\[.*\]\sSONAME\s+([^\s]+)', data)
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124 if not res:
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125 return None
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126 return res.group(1)
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127 else:
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128 def _get_soname(f):
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129 # assuming GNU binutils / ELF
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130 if not f:
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131 return None
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132 cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
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133 "objdump -p -j .dynamic 2>/dev/null " + f
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134 f = os.popen(cmd)
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135 dump = f.read()
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136 rv = f.close()
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137 if rv == 10:
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138 raise OSError('objdump command not found')
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139 with contextlib.closing(os.popen(cmd)) as f:
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140 data = f.read()
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141 res = re.search(r'\sSONAME\s+([^\s]+)', data)
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142 if not res:
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143 return None
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144 return res.group(1)
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145
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146 if (sys.platform.startswith("freebsd")
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147 or sys.platform.startswith("openbsd")
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148 or sys.platform.startswith("dragonfly")):
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149
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150 def _num_version(libname):
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151 # "libxyz.so.MAJOR.MINOR" => [ MAJOR, MINOR ]
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152 parts = libname.split(".")
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153 nums = []
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154 try:
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155 while parts:
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156 nums.insert(0, int(parts.pop()))
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157 except ValueError:
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158 pass
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159 return nums or [ sys.maxsize ]
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160
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161 def find_library(name):
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162 ename = re.escape(name)
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163 expr = r':-l%s\.\S+ => \S*/(lib%s\.\S+)' % (ename, ename)
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164 with contextlib.closing(os.popen('/sbin/ldconfig -r 2>/dev/null')) as f:
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165 data = f.read()
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166 res = re.findall(expr, data)
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167 if not res:
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168 return _get_soname(_findLib_gcc(name))
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169 res.sort(key=_num_version)
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170 return res[-1]
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171
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172 else:
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173
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174 def _findSoname_ldconfig(name):
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175 import struct
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176 if struct.calcsize('l') == 4:
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177 machine = os.uname()[4] + '-32'
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178 else:
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179 machine = os.uname()[4] + '-64'
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180 mach_map = {
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181 'x86_64-64': 'libc6,x86-64',
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182 'ppc64-64': 'libc6,64bit',
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183 'sparc64-64': 'libc6,64bit',
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184 's390x-64': 'libc6,64bit',
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185 'ia64-64': 'libc6,IA-64',
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186 }
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187 abi_type = mach_map.get(machine, 'libc6')
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188
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189 # XXX assuming GLIBC's ldconfig (with option -p)
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190 expr = r'\s+(lib%s\.[^\s]+)\s+\(%s' % (re.escape(name), abi_type)
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191 with contextlib.closing(os.popen('LC_ALL=C LANG=C /sbin/ldconfig -p 2>/dev/null')) as f:
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192 data = f.read()
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193 res = re.search(expr, data)
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194 if not res:
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195 return None
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196 return res.group(1)
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197
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198 def find_library(name):
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199 return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(name))
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200
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201 ################################################################
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202 # test code
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203
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204 def test():
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205 from ctypes import cdll
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206 if os.name == "nt":
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207 print(cdll.msvcrt)
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208 print(cdll.load("msvcrt"))
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209 print(find_library("msvcrt"))
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210
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211 if os.name == "posix":
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212 # find and load_version
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213 print(find_library("m"))
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214 print(find_library("c"))
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215 print(find_library("bz2"))
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216
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217 # getattr
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218 ## print cdll.m
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219 ## print cdll.bz2
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220
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221 # load
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222 if sys.platform == "darwin":
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223 print(cdll.LoadLibrary("libm.dylib"))
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224 print(cdll.LoadLibrary("libcrypto.dylib"))
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225 print(cdll.LoadLibrary("libSystem.dylib"))
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226 print(cdll.LoadLibrary("System.framework/System"))
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227 else:
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228 print(cdll.LoadLibrary("libm.so"))
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229 print(cdll.LoadLibrary("libcrypt.so"))
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230 print(find_library("crypt"))
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231
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232 if __name__ == "__main__":
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233 test()