File I/O : sync, async and direct??

From: Sean (seanatpurdue_at_hotmail.com)
Date: 05/30/05

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    Date: Mon, 30 May 2005 16:59:09 -0500

    What's the default option in an option, such as open("/tmp/mytest", O_RDWR)?

    what is the difference of o_sync and o_async for the block device? It
    seems there is no difference for block device such as disk(at least for
    a write, I guess), isn't it? --coz the data will be buffered in the
    kernel anyway.

    Can someone explain it? thanks.

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