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[Python-Dev] Convert int() to size_t in Python/C

Martin Panter vadmium+py at gmail.com
Fri Apr 29 19:26:53 EDT 2016 
On 29 April 2016 at 18:25, Random832 <random832 at fastmail.com> wrote:
> On Fri, Apr 29, 2016, at 14:11, Marcos Dione wrote:
>>     These are not output parameters, even if they're pointers. they'r
>> using the NULL pointer to signal that the current offsets should not be
>> touched, to differentiate from a offset of 0. Something that in Python we
>> would use None.
>
> That's not actually true according to the documentation. (And if it
> were, they could simply use -1 rather than a null pointer)
> . . .
>        *  If off_in is not NULL, then off_in must point to a buffer that
>           specifies the starting offset where bytes from fd_in will be
>           read.
>           The file offset of fd_in is not changed, >>>but off_in is
>           adjusted
>           appropriately.<<<

Linux’s sendfile() syscall takes a similar offset parameter that may
be updated, but Python’s os.sendfile() wrapper does not return the
updated offset. Do you think we need to return the updated offsets for
copy_file_range()?
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