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- Subject: Re: No os.copy or lfs.copy?
- From: Brett Nash <nash@...>
- Date: Tue, 08 Apr 2008 16:48:54 +1000
On Tue, 2008-04-08 at 18:16 +1200, Geoff Leyland wrote:
> Thanks Gary,
> I hadn't really thought of that. I'm copying a "read-only" data file
> to a tmpname before I muck with it so I was thinking in shell
> If read/write might be slow, then os.execute's fine. The data might
> be tens or low hundreds of MB.
Copy is something which generally has to implemented in user space,
there isn't normally a system call to do it. Hence no POSIXy or Unixy
way of doing it.
Although if you want to be really tricky:
src = open("srcfile", O_RDONLY)
dst = open("dstfile", O_WRONLY);
splice(src,NULL, dst, NULL, st.st_size, 0);
Not exactly portable at the last step however...