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sql/log.cc
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      my_off_t offset= BIN_LOG_HEADER_SIZE + FLAGS_OFFSET;
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      my_off_t org_position= my_tell(log_file.file, MYF(0));
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      uchar flags= 0;            // clearing LOG_EVENT_BINLOG_IN_USE_F
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      my_pwrite(log_file.file, &flags, 1, offset, MYF(0));
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      /*
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        Restore position so that anything we have in the IO_cache is written
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        to the correct position.
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        We need the seek here, as my_pwrite() is not guaranteed to keep the
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        original position on system that doesn't support pwrite().
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      */
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      my_seek(log_file.file, org_position, MY_SEEK_SET, MYF(0));
 
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      pwrite(log_file.file, &flags, 1, offset);
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    }
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    /* this will cleanup IO_CACHE, sync and close the file */