Python ctypes.get_errno() Examples

def umount(self):
        """Unmount disk."""
        if not self.mountpoint:
            return
        signals.emit("filesystems", "pre_umount", self)
        loops = losetup.get_loop_devices()
        for l in loops:
            if loops[l].is_used() and loops[l].get_filename() == self.path:
                dev = loops[l]
                break
        s = libc.umount2(ctypes.c_char_p(b(self.mountpoint)), 0)
        if s == -1:
            excmsg = "Failed to unmount {0}: {1}"
            raise errors.OperationFailedError(
                excmsg.format(self.id, os.strerror(ctypes.get_errno())))
        if self.crypt:
            crypto.luks_close(self.id)
        if dev:
            dev.unmount()
        signals.emit("filesystems", "post_umount", self)
        self.mountpoint = None 

def _sem_open(name, value=None):
    """ Construct or retrieve a semaphore with the given name

    If value is None, try to retrieve an existing named semaphore.
    Else create a new semaphore with the given value
    """
    if value is None:
        handle = pthread.sem_open(ctypes.c_char_p(name), 0)
    else:
        handle = pthread.sem_open(ctypes.c_char_p(name), SEM_OFLAG, SEM_PERM,
                                  ctypes.c_int(value))

    if handle == SEM_FAILURE:
        e = ctypes.get_errno()
        if e == errno.EEXIST:
            raise FileExistsError("a semaphore named %s already exists" % name)
        elif e == errno.ENOENT:
            raise FileNotFoundError('cannot find semaphore named %s' % name)
        elif e == errno.ENOSYS:
            raise NotImplementedError('No semaphore implementation on this '
                                      'system')
        else:
            raiseFromErrno()

    return handle 

def acquire(self, block=True, timeout=None):
        if self.kind == RECURSIVE_MUTEX and self._is_mine():
            self.count += 1
            return True

        if block and timeout is None:
            res = pthread.sem_wait(self.handle)
        elif not block or timeout <= 0:
            res = pthread.sem_trywait(self.handle)
        else:
            res = _sem_timedwait(self.handle, timeout)
        if res < 0:
            e = ctypes.get_errno()
            if e == errno.EINTR:
                return None
            elif e in [errno.EAGAIN, errno.ETIMEDOUT]:
                return False
            raiseFromErrno()
        self.count += 1
        self.ident = get_ident()
        return True 

def _check_errno(result, func, arguments):
    assert func.restype in [c_int, c_void_p]
    if (func.restype == c_int and result == -1) or (
        func.restype == c_void_p and c_void_p(result).value == c_void_p(-1).value
    ):
        errno = _ctypes.get_errno()
        try:
            func_name = func.__name__
        except AttributeError:
            func_name = "__unknown__"
        msg = (
            func_name
            + "("
            + ", ".join(map(str, arguments))
            + ") failed: "
            + _os.strerror(errno)
        )
        raise OSError(errno, msg)
    return result


# off_t is a signed integer type required for mmap.
# In my tests it is equal to long on both 32bit and 64bit x86 Linux. 

def monotonicTime(self, asSeconds = True):
        t = timespec()
        if self.clock_gettime(rmMonotonicTime.CLOCK_MONOTONIC_RAW , ctypes.pointer(t)) != 0:
            errno_ = ctypes.get_errno()
            if self.fallback:
                log.info("Monotonic Clock Error ! Reverting to time.time() fallback")
                return self.monotonicFallback(asSeconds)
            else:
                raise OSError(errno_, os.strerror(errno_))

        if asSeconds:
            return t.tv_sec

        return t.tv_sec + t.tv_nsec * 1e-9


#-----------------------------------------------------------------------------------------------
#
#
# 

def _remove_watch_for_path(self, path):
    logging.debug('_remove_watch_for_path(%r)', path)
    wd = self._directory_to_watch_descriptor[path]

    if InotifyFileWatcher._libc.inotify_rm_watch(self._inotify_fd, wd) < 0:
      # If the directory is deleted then the watch will removed automatically
      # and inotify_rm_watch will fail. Just log the error.
      logging.debug('inotify_rm_watch failed for %r: %d [%r]',
                    path,
                    ctypes.get_errno(),
                    errno.errorcode[ctypes.get_errno()])

    parent_path = os.path.dirname(path)
    if parent_path in self._directory_to_subdirs:
      self._directory_to_subdirs[parent_path].remove(path)

    # _directory_to_subdirs must be copied because it is mutated in the
    # recursive call.
    for subdir in frozenset(self._directory_to_subdirs[path]):
      self._remove_watch_for_path(subdir)

    del self._watch_to_directory[wd]
    del self._directory_to_watch_descriptor[path]
    del self._directory_to_subdirs[path] 

def open_dev(bt_device_id):
    """Open hci device socket."""
    # pylint: disable=no-member
    sock = socket.socket(socket.AF_BLUETOOTH, socket.SOCK_RAW, socket.BTPROTO_HCI)

    # Unlike Linux, FreeBSD has separate numbering depending on hardware
    # (ubt - USB bluetooth - is the most common, so convert numbers to that)
    if not isinstance(bt_device_id, str):
        bt_device_id = 'ubt{}hci'.format(bt_device_id)

    # Python's BTPROTO_HCI address parsing is busted: https://bugs.python.org/issue41130
    adr = SockaddrHci(ctypes.sizeof(SockaddrHci), socket.AF_BLUETOOTH, bt_device_id.ljust(32, '\0').encode('utf-8'))
    if libc.bind(sock.fileno(), ctypes.pointer(adr), ctypes.sizeof(SockaddrHci)) != 0:
        raise ConnectionError(ctypes.get_errno(), os.strerror(ctypes.get_errno()))
    if libc.connect(sock.fileno(), ctypes.pointer(adr), ctypes.sizeof(SockaddrHci)) != 0:
        raise ConnectionError(ctypes.get_errno(), os.strerror(ctypes.get_errno()))
    # pylint: enable=no-member

    fltr = HciRawFilter(0, NG_HCI_EVENT_MASK_LE)
    if libc.setsockopt(sock.fileno(),
                       SOL_HCI_RAW, SOL_HCI_RAW_FILTER,
                       ctypes.pointer(fltr), ctypes.sizeof(HciRawFilter)) != 0:
        raise ConnectionError(ctypes.get_errno(), os.strerror(ctypes.get_errno()))

    return sock 

def _ptrace(self, attach):
        op = ctypes.c_int(PTRACE_ATTACH if attach else PTRACE_DETACH)
        c_pid = c_pid_t(self.pid)
        null = ctypes.c_void_p()

        if not attach:
            os.kill(self.pid, signal.SIGSTOP)
            os.waitpid(self.pid, 0)

        err = c_ptrace(op, c_pid, null, null)

        if not attach:
            os.kill(self.pid, signal.SIGCONT)

        if err != 0:
            raise OSError("%s: %s"%(
                'PTRACE_ATTACH' if attach else 'PTRACE_DETACH',
                errno.errorcode.get(ctypes.get_errno(), 'UNKNOWN')
            )) 

def _is_zero(self):
        if sys.platform == 'darwin':
            # Handle broken get_value for mac ==> only Lock will work
            # as sem_get_value do not work properly
            if pthread.sem_trywait(self.handle) < 0:
                e = ctypes.get_errno()
                if e == errno.EAGAIN:
                    return True
                raise OSError(e, errno.errorcode[e])
            else:
                if pthread.sem_post(self.handle) < 0:
                    raiseFromErrno()
                return False
        else:
            value = ctypes.pointer(ctypes.c_int(-1))
            if pthread.sem_getvalue(self.handle, value) < 0:
                raiseFromErrno()
            return value.contents.value == 0 

def _create_file_from_fd(pfd):
    """Validates file description and creates a file-like object"""
    # -1 is returned on error: http://man7.org/linux/man-pages/man2/open.2.html#RETURN_VALUE
    if pfd == -1:
        INVALID_ARG_ERRNO = 22
        errno = ctypes.get_errno()
        if errno == INVALID_ARG_ERRNO:
            raise UnableToOpenPerfEvents('Invalid perf event file descriptor: {}, {}. '
                                         'For cgroup based perf counters it may indicate there is '
                                         'no enough hardware counters for measure all metrics!'
                                         'If traceback shows problem in perf_uncore '
                                         'it could be problem with PERF_FORMAT_GROUP in'
                                         'perf_event_attr structure for perf_event_open syscall.'
                                         'Older kernel cannot handle with extended format group.'
                                         'Kernel cannot be 3.10.0-862.el7.x86_64 or lower.'
                                         ''.format(errno, os.strerror(errno)))
        else:
            raise UnableToOpenPerfEvents('Invalid perf event file descriptor: {}, {}.'
                                         .format(errno, os.strerror(errno)))
    return os.fdopen(pfd, 'rb') 

def _migrate_page_call(pid, max_node, old_nodes, new_node) -> int:
    """Wrapper on migrate_pages function using libc syscall"""

    pid = int(pid)
    max = ctypes.c_ulong(max_node + 1)
    old = ctypes.pointer(ctypes.c_ulong(old_nodes))
    new = ctypes.pointer(ctypes.c_ulong(new_node))

    # Example memory_migrate(256, pid, 5, 13 -> b'1101', 2 -> b'0010')
    result = LIBC.syscall(NR_MIGRATE_PAGES, pid, max, old, new)

    if result == -1:
        errno = ctypes.get_errno()
        raise UnableToMigratePages('Unable to migrate pages: {}, {}.'
                                   .format(errno, os.strerror(errno)))
    log.log(TRACE, 'Number of not moved pages (return from migrate_pages syscall): %d', result)
    return result 

def getresgid():
    rgid = ctypes.c_long()
    egid = ctypes.c_long()
    sgid = ctypes.c_long()
    res = _libc.getresgid(ctypes.byref(rgid), ctypes.byref(egid), ctypes.byref(sgid))
    if res:
        raise OSError(ctypes.get_errno(), os.strerror(ctypes.get_errno()))
    return (rgid.value, egid.value, sgid.value) 

def getresuid():
    ruid = ctypes.c_long()
    euid = ctypes.c_long()
    suid = ctypes.c_long()
    res = _libc.getresuid(ctypes.byref(ruid), ctypes.byref(euid), ctypes.byref(suid))
    if res:
        raise OSError(ctypes.get_errno(), os.strerror(ctypes.get_errno()))
    return (ruid.value, euid.value, suid.value) 

def sendfile(fdout, fdin, offset, nbytes):
    if sys.platform == 'darwin':
        _sendfile.argtypes = [ctypes.c_int, ctypes.c_int, ctypes.c_uint64,
                              ctypes.POINTER(ctypes.c_uint64), ctypes.c_voidp,
                              ctypes.c_int]
        _nbytes = ctypes.c_uint64(nbytes)
        result = _sendfile(fdin, fdout, offset, _nbytes, None, 0)

        if result == -1:
            e = ctypes.get_errno()
            if e == errno.EAGAIN and _nbytes.value is not None:
                return _nbytes.value
            raise OSError(e, os.strerror(e))
        return _nbytes.value
    elif sys.platform in ('freebsd', 'dragonfly',):
        _sendfile.argtypes = [ctypes.c_int, ctypes.c_int, ctypes.c_uint64,
                              ctypes.c_uint64, ctypes.c_voidp,
                              ctypes.POINTER(ctypes.c_uint64), ctypes.c_int]
        _sbytes = ctypes.c_uint64()
        result = _sendfile(fdin, fdout, offset, nbytes, None, _sbytes, 0)
        if result == -1:
            e = ctypes.get_errno()
            if e == errno.EAGAIN and _sbytes.value is not None:
                return _sbytes.value
            raise OSError(e, os.strerror(e))
        return _sbytes.value

    else:
        _sendfile.argtypes = [ctypes.c_int, ctypes.c_int,
                ctypes.POINTER(ctypes.c_uint64), ctypes.c_size_t]

        _offset = ctypes.c_uint64(offset)
        sent = _sendfile(fdout, fdin, _offset, nbytes)
        if sent == -1:
            e = ctypes.get_errno()
            raise OSError(e, os.strerror(e))
        return sent 

def __call__(self, *args):
        ret = self.f(*args)
        if not ret and get_errno():
            raise PyperclipWindowsException("Error calling " + self.f.__name__)
        return ret 

def get_errno():
        raise NotImplementedError(
            'Your python version does not support errno/last_error'
        ) 

def _raise_error():
        """
        Raises errors for inotify failures.
        """
        err = ctypes.get_errno()
        if err == errno.ENOSPC:
            raise OSError("inotify watch limit reached")
        elif err == errno.EMFILE:
            raise OSError("inotify instance limit reached")
        else:
            raise OSError(os.strerror(err)) 

def monotonic():
    t = timespec()
    if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(t)) != 0:
        errno_ = ctypes.get_errno()
        raise OSError(errno_, os.strerror(errno_))
    return t.tv_sec * 1000000000 + t.tv_nsec 

def __call__(self, *args):
        ret = self.f(*args)
        if not ret and get_errno():
            raise PyperclipWindowsException("Error calling " + self.f.__name__)
        return ret 

def __init__(self, message, *args, **kwargs):
        self.errno = ctypes.get_errno()
        message += " ERRNO=(%d)" % (self.errno,)

        super(InotifyError, self).__init__(message, *args, **kwargs) 

def setresuid(ruid=-1, euid=-1, suid=-1):
    ruid = ctypes.c_long(ruid)
    euid = ctypes.c_long(euid)
    suid = ctypes.c_long(suid)
    res = _libc.setresuid(ruid, euid, suid)
    if res:
        raise OSError(ctypes.get_errno(), os.strerror(ctypes.get_errno())) 

def __call__(self, *args):
        ret = self.f(*args)
        if not ret and get_errno():
            raise PyperclipWindowsException("Error calling " + self.f.__name__)
        return ret 

def condPersonality(per=None):
    if per is None or per in ('noarch',):
        return
    if personality_defs.get(per, None) is None:
        return
    res = _libc.personality(personality_defs[per])
    if res == -1:
        raise OSError(ctypes.get_errno(), os.strerror(ctypes.get_errno())) 

def unshare(flags):
    getLog().debug("Unsharing. Flags: %s", flags)
    try:
        res = _libc.unshare(flags)
        if res:
            raise exception.UnshareFailed(os.strerror(ctypes.get_errno()))
    except AttributeError:
        pass 

def errno():
        return ctypes.get_errno() 

def get_errno(self):
        return ctypes.get_errno() 

def clock_gettime(clk_id):
    tp = timespec()
    if _clock_gettime(clk_id, ctypes.byref(tp)) < 0:
        err = ctypes.get_errno()
        msg = errno.errorcode[err]
        if err == errno.EINVAL:
            msg += (
                " The clk_id specified is not supported on this system" " clk_id=%r"
            ) % (clk_id,)
        raise OSError(err, msg)
    return tp.tv_sec + tp.tv_nsec * 1e-9 

def monotonic():
                """Monotonic clock, cannot go backward."""
                ts = timespec()
                if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(ts)):
                    errno = ctypes.get_errno()
                    raise OSError(errno, os.strerror(errno))
                return ts.tv_sec + ts.tv_nsec / 1.0e9

        # Perform a sanity-check. 

def get_errno(self):
        return ctypes.get_errno() 

def get_errno(self):
        return ctypes.get_errno()