def _pipe_write(self, buf):
size = len(buf)
log("pipe_write: %i bytes", size) #binascii.hexlify(buf))
written = c_ulong(0)
r = WriteFile(self.pipe_handle, c_char_p(buf), len(buf),
byref(written), byref(self.write_overlapped))
log("WriteFile(..)=%s, len=%i", r, written.value)
if not r and self.pipe_handle:
e = GetLastError()
if e != ERROR_IO_PENDING:
log("WriteFile: %s", ERROR_STR.get(e, e))
r = WaitForSingleObject(self.write_event, INFINITE)
log("WaitForSingleObject(..)=%s, len=%i", WAIT_STR.get(r, r),
written.value)
if not self.pipe_handle:
#closed already!
return written.value
if r:
raise Exception(
"failed to write buffer to named pipe handle %s" %
self.pipe_handle)
if self.pipe_handle:
if not GetOverlappedResult(self.pipe_handle,
byref(self.write_overlapped),
byref(written), False):
e = GetLastError()
raise Exception("overlapped write failed: %s" %
ERROR_STR.get(e, e))
log("pipe_write: %i bytes written", written.value)
if self.pipe_handle:
FlushFileBuffers(self.pipe_handle)
#SetFilePointer(self.pipe_handle, 0, FILE_BEGIN)
return written.value
def _pipe_read(self, buf):
read = c_ulong(0)
r = ReadFile(self.pipe_handle, self.read_buffer_ptr, BUFSIZE,
byref(read), byref(self.read_overlapped))
log("ReadFile(..)=%i, len=%s", r, read.value)
if not r and self.pipe_handle:
e = GetLastError()
if e != ERROR_IO_PENDING:
log("ReadFile: %s", ERROR_STR.get(e, e))
r = WaitForSingleObject(self.read_event, INFINITE)
log("WaitForSingleObject(..)=%s, len=%s", WAIT_STR.get(r, r),
read.value)
if r and self.pipe_handle:
raise Exception("failed to read from named pipe handle %s" %
self.pipe_handle)
if self.pipe_handle:
if not GetOverlappedResult(self.pipe_handle,
byref(self.read_overlapped),
byref(read), False):
e = GetLastError()
if e != ERROR_BROKEN_PIPE:
raise Exception("overlapped read failed: %s" %
ERROR_STR.get(e, e))
if read.value == 0:
data = None
else:
data = string_at(self.read_buffer_ptr, read.value)
log("pipe_read: %i bytes", len(data or "")) #, binascii.hexlify(s))
return data