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Re: iovec member reuse
On Sun, Jan 18, 2009 at 04:21:43PM +0000, Iain Hibbert wrote:
> Query: is it safe to re-use an iovec array without re-initialising it?
In userspace, yes. The documentation of readv and writev says that the
iov array is const, and that probably means standards say so also,
although I haven't looked.
But, note that iovecs that are placed in struct uio in the kernel are
*not* const; uiomove advances the pointers as data is transferred.
For the system calls this is done on an in-kernel copy that isn't
David A. Holland
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