test_util.py 文件源码

def write_data(self, fd, offset=0, size=None, pattern=None):
        """Write data to the file given by the file descriptor

           fd:
               File descriptor
           offset:
               File offset where data will be written to [default: 0]
           size:
               Total number of bytes to write [default: --filesize option]
           pattern:
               Data pattern to write to the file [default: data_pattern default]
        """
        if size is None:
            size = self.filesize

        while size > 0:
            # Write as much as wsize bytes per write call
            dsize = min(self.wsize, size)
            os.lseek(fd, offset, 0)
            count = os.write(fd, self.data_pattern(offset, dsize, pattern))
            size -= count
            offset += count