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eb063011ab
Replace os.popen() with subprocess.Popen. If the "gcc", "cc" or "objdump" command is not available, the code was supposed to raise an OSError exception. But there was a bug in the code. The shell code returns the exit code 10 if the required command is missing, and the code tries to check for the status 10. The problem is that os.popen() doesn't return the exit code directly, but a status which should be processed by os.WIFEXITED() and os.WEXITSTATUS(). In practice, the exception was never raised. The OSError exception was not documented and ctypes.util.find_library() is expected to return None if the library is not found. Based on patch by Victor Stinner.
309 lines
10 KiB
Python
309 lines
10 KiB
Python
import os
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import subprocess
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import sys
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# find_library(name) returns the pathname of a library, or None.
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if os.name == "nt":
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def _get_build_version():
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"""Return the version of MSVC that was used to build Python.
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For Python 2.3 and up, the version number is included in
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sys.version. For earlier versions, assume the compiler is MSVC 6.
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"""
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# This function was copied from Lib/distutils/msvccompiler.py
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prefix = "MSC v."
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i = sys.version.find(prefix)
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if i == -1:
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return 6
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i = i + len(prefix)
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s, rest = sys.version[i:].split(" ", 1)
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majorVersion = int(s[:-2]) - 6
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minorVersion = int(s[2:3]) / 10.0
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# I don't think paths are affected by minor version in version 6
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if majorVersion == 6:
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minorVersion = 0
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if majorVersion >= 6:
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return majorVersion + minorVersion
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# else we don't know what version of the compiler this is
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return None
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def find_msvcrt():
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"""Return the name of the VC runtime dll"""
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version = _get_build_version()
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if version is None:
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# better be safe than sorry
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return None
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if version <= 6:
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clibname = 'msvcrt'
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else:
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clibname = 'msvcr%d' % (version * 10)
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# If python was built with in debug mode
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import imp
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if imp.get_suffixes()[0][0] == '_d.pyd':
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clibname += 'd'
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return clibname+'.dll'
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def find_library(name):
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if name in ('c', 'm'):
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return find_msvcrt()
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# See MSDN for the REAL search order.
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for directory in os.environ['PATH'].split(os.pathsep):
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fname = os.path.join(directory, name)
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if os.path.isfile(fname):
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return fname
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if fname.lower().endswith(".dll"):
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continue
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fname = fname + ".dll"
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if os.path.isfile(fname):
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return fname
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return None
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if os.name == "ce":
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# search path according to MSDN:
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# - absolute path specified by filename
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# - The .exe launch directory
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# - the Windows directory
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# - ROM dll files (where are they?)
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# - OEM specified search path: HKLM\Loader\SystemPath
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def find_library(name):
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return name
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if os.name == "posix" and sys.platform == "darwin":
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from ctypes.macholib.dyld import dyld_find as _dyld_find
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def find_library(name):
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possible = ['lib%s.dylib' % name,
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'%s.dylib' % name,
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'%s.framework/%s' % (name, name)]
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for name in possible:
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try:
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return _dyld_find(name)
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except ValueError:
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continue
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return None
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elif os.name == "posix":
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# Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
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import re, tempfile, errno
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def _findLib_gcc(name):
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# Run GCC's linker with the -t (aka --trace) option and examine the
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# library name it prints out. The GCC command will fail because we
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# haven't supplied a proper program with main(), but that does not
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# matter.
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expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
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cmd = 'if type gcc >/dev/null 2>&1; then CC=gcc; elif type cc >/dev/null 2>&1; then CC=cc;else exit; fi;' \
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'LANG=C LC_ALL=C $CC -Wl,-t -o "$2" 2>&1 -l"$1"'
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temp = tempfile.NamedTemporaryFile()
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try:
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proc = subprocess.Popen((cmd, '_findLib_gcc', name, temp.name),
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shell=True,
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stdout=subprocess.PIPE)
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[trace, _] = proc.communicate()
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finally:
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try:
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temp.close()
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except OSError, e:
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# ENOENT is raised if the file was already removed, which is
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# the normal behaviour of GCC if linking fails
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if e.errno != errno.ENOENT:
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raise
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res = re.search(expr, trace)
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if not res:
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return None
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return res.group(0)
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if sys.platform == "sunos5":
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# use /usr/ccs/bin/dump on solaris
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def _get_soname(f):
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if not f:
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return None
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null = open(os.devnull, "wb")
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try:
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with null:
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proc = subprocess.Popen(("/usr/ccs/bin/dump", "-Lpv", f),
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stdout=subprocess.PIPE,
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stderr=null)
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except OSError: # E.g. command not found
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return None
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[data, _] = proc.communicate()
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res = re.search(br'\[.*\]\sSONAME\s+([^\s]+)', data)
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if not res:
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return None
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return res.group(1)
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else:
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def _get_soname(f):
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# assuming GNU binutils / ELF
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if not f:
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return None
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cmd = 'if ! type objdump >/dev/null 2>&1; then exit; fi;' \
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'objdump -p -j .dynamic 2>/dev/null "$1"'
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proc = subprocess.Popen((cmd, '_get_soname', f), shell=True,
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stdout=subprocess.PIPE)
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[dump, _] = proc.communicate()
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res = re.search(br'\sSONAME\s+([^\s]+)', dump)
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if not res:
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return None
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return res.group(1)
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if (sys.platform.startswith("freebsd")
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or sys.platform.startswith("openbsd")
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or sys.platform.startswith("dragonfly")):
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def _num_version(libname):
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# "libxyz.so.MAJOR.MINOR" => [ MAJOR, MINOR ]
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parts = libname.split(b".")
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nums = []
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try:
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while parts:
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nums.insert(0, int(parts.pop()))
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except ValueError:
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pass
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return nums or [sys.maxint]
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def find_library(name):
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ename = re.escape(name)
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expr = r':-l%s\.\S+ => \S*/(lib%s\.\S+)' % (ename, ename)
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null = open(os.devnull, 'wb')
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try:
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with null:
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proc = subprocess.Popen(('/sbin/ldconfig', '-r'),
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stdout=subprocess.PIPE,
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stderr=null)
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except OSError: # E.g. command not found
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data = b''
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else:
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[data, _] = proc.communicate()
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res = re.findall(expr, data)
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if not res:
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return _get_soname(_findLib_gcc(name))
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res.sort(key=_num_version)
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return res[-1]
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elif sys.platform == "sunos5":
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def _findLib_crle(name, is64):
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if not os.path.exists('/usr/bin/crle'):
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return None
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env = dict(os.environ)
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env['LC_ALL'] = 'C'
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if is64:
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args = ('/usr/bin/crle', '-64')
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else:
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args = ('/usr/bin/crle',)
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paths = None
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null = open(os.devnull, 'wb')
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try:
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with null:
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proc = subprocess.Popen(args,
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stdout=subprocess.PIPE,
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stderr=null,
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env=env)
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except OSError: # E.g. bad executable
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return None
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try:
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for line in proc.stdout:
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line = line.strip()
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if line.startswith(b'Default Library Path (ELF):'):
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paths = line.split()[4]
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finally:
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proc.stdout.close()
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proc.wait()
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if not paths:
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return None
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for dir in paths.split(":"):
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libfile = os.path.join(dir, "lib%s.so" % name)
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if os.path.exists(libfile):
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return libfile
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return None
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def find_library(name, is64 = False):
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return _get_soname(_findLib_crle(name, is64) or _findLib_gcc(name))
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else:
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def _findSoname_ldconfig(name):
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import struct
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if struct.calcsize('l') == 4:
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machine = os.uname()[4] + '-32'
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else:
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machine = os.uname()[4] + '-64'
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mach_map = {
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'x86_64-64': 'libc6,x86-64',
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'ppc64-64': 'libc6,64bit',
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'sparc64-64': 'libc6,64bit',
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's390x-64': 'libc6,64bit',
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'ia64-64': 'libc6,IA-64',
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}
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abi_type = mach_map.get(machine, 'libc6')
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# XXX assuming GLIBC's ldconfig (with option -p)
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expr = r'\s+(lib%s\.[^\s]+)\s+\(%s' % (re.escape(name), abi_type)
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env = dict(os.environ)
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env['LC_ALL'] = 'C'
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env['LANG'] = 'C'
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null = open(os.devnull, 'wb')
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try:
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with null:
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p = subprocess.Popen(['/sbin/ldconfig', '-p'],
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stderr=null,
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stdout=subprocess.PIPE,
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env=env)
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except OSError: # E.g. command not found
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return None
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[data, _] = p.communicate()
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res = re.search(expr, data)
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if not res:
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return None
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return res.group(1)
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def find_library(name):
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return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(name))
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################################################################
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# test code
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def test():
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from ctypes import cdll
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if os.name == "nt":
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print cdll.msvcrt
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print cdll.load("msvcrt")
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print find_library("msvcrt")
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if os.name == "posix":
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# find and load_version
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print find_library("m")
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print find_library("c")
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print find_library("bz2")
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# getattr
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## print cdll.m
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## print cdll.bz2
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# load
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if sys.platform == "darwin":
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print cdll.LoadLibrary("libm.dylib")
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print cdll.LoadLibrary("libcrypto.dylib")
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print cdll.LoadLibrary("libSystem.dylib")
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print cdll.LoadLibrary("System.framework/System")
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else:
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print cdll.LoadLibrary("libm.so")
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print cdll.LoadLibrary("libcrypt.so")
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print find_library("crypt")
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if __name__ == "__main__":
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test()
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