FM / ctypes

/usr/lib64/python2.6/ctypes

Name	Size	Mode	Actions
macholib/	-	0755	rm
util.py	8531	0644	edit dl rm
util.py.binutils-no-dep	8376	0644	edit dl rm
util.pyc	7493	0644	edit dl rm
util.pyo	7493	0644	edit dl rm
wintypes.py	5349	0644	edit dl rm
wintypes.pyc	5959	0644	edit dl rm
wintypes.pyo	5959	0644	edit dl rm
_endian.py	2041	0644	edit dl rm
_endian.pyc	2286	0644	edit dl rm
_endian.pyo	2286	0644	edit dl rm
__init__.py	17004	0644	edit dl rm
__init__.pyc	19936	0644	edit dl rm
__init__.pyo	19936	0644	edit dl rm

Edit: /usr/lib64/python2.6/ctypes/util.py (8531B)

######################################################################
#  This file should be kept compatible with Python 2.3, see PEP 291. #
######################################################################
import sys, os

# 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
        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'
        else:
            clibname = 'msvcr%d' % (version * 10)

# If python was built with in debug mode
        import imp
        if imp.get_suffixes()[0][0] == '_d.pyd':
            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 == "ce":
    # search path according to MSDN:
    # - absolute path specified by filename
    # - The .exe launch directory
    # - the Windows directory
    # - ROM dll files (where are they?)
    # - OEM specified search path: HKLM\Loader\SystemPath
    def find_library(name):
        return name

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

elif os.name == "posix":
    # Andreas Degert's find functions, using gcc, /sbin/ldconfig, objdump
    import re, tempfile, errno

def _findLib_gcc(name):
        expr = r'[^\s]*lib%s\.[^\s]*' % re.escape(name)
        fdout, ccout = tempfile.mkstemp()
        os.close(fdout)
        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;' \
              '$CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
        try:
            f = os.popen(cmd)
            trace = f.read()
            rv = f.close()
        finally:
            try:
                os.unlink(ccout)
            except OSError, e:
                if e.errno != errno.ENOENT:
                    raise
        if rv == 10:
            raise OSError, 'gcc or cc command not found'
        res = re.search(expr, trace)
        if not res:
            return None
        return res.group(0)

if sys.platform == "sunos5":
        # use /usr/ccs/bin/dump on solaris
        def _get_soname(f):
            if not f:
                return None
            cmd = "/usr/ccs/bin/dump -Lpv 2>/dev/null " + f
            res = re.search(r'\[.*\]\sSONAME\s+([^\s]+)', os.popen(cmd).read())
            if not res:
                return None
            return res.group(1)
    else:
        def _get_soname(f):
            # assuming GNU binutils / ELF
            if not f:
                return None
            cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
                  "objdump -p -j .dynamic 2>/dev/null " + f
            f = os.popen(cmd)
            dump = f.read()
            rv = f.close()
            if rv == 10:
                return os.path.basename(f) #  This is good for GLibc, I think,
                                           # and a dep on binutils is big (for
                                           # live CDs).
            res = re.search(r'\sSONAME\s+([^\s]+)', os.popen(cmd).read())
            if not res:
                return None
            return res.group(1)

if (sys.platform.startswith("freebsd")
        or sys.platform.startswith("openbsd")
        or sys.platform.startswith("dragonfly")):

def _num_version(libname):
            # "libxyz.so.MAJOR.MINOR" => [ MAJOR, MINOR ]
            parts = libname.split(".")
            nums = []
            try:
                while parts:
                    nums.insert(0, int(parts.pop()))
            except ValueError:
                pass
            return nums or [ sys.maxint ]

def find_library(name):
            ename = re.escape(name)
            expr = r':-l%s\.\S+ => \S*/(lib%s\.\S+)' % (ename, ename)
            res = re.findall(expr,
                             os.popen('/sbin/ldconfig -r 2>/dev/null').read())
            if not res:
                return _get_soname(_findLib_gcc(name))
            res.sort(cmp= lambda x,y: cmp(_num_version(x), _num_version(y)))
            return res[-1]

else:

def _findLib_ldconfig(name):
            # XXX assuming GLIBC's ldconfig (with option -p)
            expr = r'/[^\s]*lib%s\.[^\s]*' % re.escape(name)
            res = re.search(expr,
                            os.popen('/sbin/ldconfig -p 2>/dev/null').read())
            if not res:
                # Hm, this works only for libs needed by the python executable.
                cmd = 'ldd %s 2>/dev/null' % sys.executable
                res = re.search(expr, os.popen(cmd).read())
                if not res:
                    return None
            return res.group(0)

def _findSoname_ldconfig(name):
            import struct
            if struct.calcsize('l') == 4:
                machine = os.uname()[4] + '-32'
            else:
                machine = os.uname()[4] + '-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',
                }
            abi_type = mach_map.get(machine, 'libc6')

# XXX assuming GLIBC's ldconfig (with option -p)
            expr = r'(\S+)\s+$(%s(?:, OS ABI:[^$]*)?)\)[^/]*(/[^\s]*lib%s\.[^\s]*)' \
                   % (abi_type, re.escape(name))
            res = re.search(expr,
                            os.popen('LANG=C /sbin/ldconfig -p 2>/dev/null').read())
            if not res:
                return None
            return res.group(1)

def find_library(name):
            return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(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")

# getattr
##        print cdll.m
##        print cdll.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")
        else:
            print cdll.LoadLibrary("libm.so")
            print cdll.LoadLibrary("libcrypt.so")
            print find_library("crypt")

if __name__ == "__main__":
    test()

cmd: