In which case EWOULDBLOCK is set while a write operation

In which case EWOULDBLOCK is set while a write operation

[Saquib Imam]

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In which case EWOULDBLOCK / EAGAIN is set while a write operation ?

 

Can any one give detailed processing of a write operation for a file system
with journaling , like EXT3 File System.

 

Thanks & Regards,

Saquib Imam 

 


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Re: In which case EWOULDBLOCK is set while a write operation

[Mulyadi Santosa]

Hi..

> In which case EWOULDBLOCK / EAGAIN is set while a write operation ?

i think it will happen if you use O_NONBLOCK but writing operation
itself will clearly block (for numerous reasons e.g block needs to be
allocated first and so on).

> Can any one give detailed processing of a write operation for a file system
> with journaling , like EXT3 File System.

better grab book like Understanding the Linux kernel 3rd edition or
Linux Device Driver 3rd edition. It is explained quite extensively
there.

regards,

Mulyadi.

Re: In which case EWOULDBLOCK is set while a write operation

[Erik Mouw]

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On Tue, Dec 18, 2007 at 11:27:49AM +0530, Saquib Imam wrote:
> In which case EWOULDBLOCK / EAGAIN is set while a write operation ?

From write(2):

ERRORS
       EAGAIN Non-blocking  I/O  has  been  selected  using O_NONBLOCK and the
              write would block.


Erik

-- 
They're all fools. Don't worry. Darwin may be slow, but he'll
eventually get them. -- Matthew Lammers in alt.sysadmin.recovery

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