Thank you Dan.

Dan Fandrich wrote:
> On Thu, Nov 04, 2010 at 01:29:39PM -0400, German Escallon wrote:
>
>> My application continuously downloads several XML files through cURL
>> FTP methods at a certain interval (say once every hour).
>> Also, another process reads those files and performs operations on
>> them (read, mv, cp, etc) at a different interval.
>>
>> Does anyone know if the WRITE_DATA operation is atomic?
>> In other words. Is it safe to assume that if I'm downloading file X,
>> and another process is trying to access X while curl_easy_perform is
>> writing to it, the other process will not get a corrupted or partial
>> file? I'm attaching some sample code. Thank you in advance.
>>
>
> A server could theoretically send the XML file a byte at a time, spread out
> over 20 minutes. Depending on the file size and the libc buffering, the
> file on disk could slowly increase in size by the same amount. If you're
> concerned that clients not have access to the file as it's thus written,
> then you'll have to take explicit steps to avoid it. The obvious ways
> would be to lock the file as it's downloading, or download it to a temporary
> location then atomically move it into the right location once it's complete.
>
>
>>>> Dan
>>>>
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Received on 2010-11-04