pread/pwrite (was Re: files: direct access - NOT sequential)

Alex Martelli aleax at aleax.it
Wed Apr 16 00:00:25 CEST 2003


On Tuesday 15 April 2003 08:21 pm, Jeff Epler wrote:
   ...
> pread() call.  (if you *always* want to append to the file, there's a way
> to do that now with write(), isn't there? opening with os.open(,O_APPEND)

Yep, but if you sometimes want to append and sometimes to write to
a specific offset?

> / file(,"a").  Hm, what does pwrite() do on a file opened with
> O_APPEND?)

No idea (not familiar with pwrite &c).

> I was really thing in "wrap C routines to Python" mode, not "what would
> be a useful way to expose this kind of functionality to Python" mode...

Then Guido will likely not be all that interested, since the redesign I was
mentioning is about getting _away_ from dependencies on the underlying
C libraries.  Maybe there's a space for these platform-dependent syscalls
in posix.* or whatever for specific platforms, I dunno.

> that library in another thread you'd want this.  Blech.  But if you're
> writing a Python program you'd probably never use something as primitive
> as a single file object shared in multiple threads.

Me?  I sure wouldn't, right.  But if others are doing it, perhaps module
posix should expose this, I dunno.


Alex






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