On Tue, 10 Feb 2026 05:13:47 -0500
"Alyssa M via 9fans" <[email protected]> wrote:
> On Monday, February 09, 2026, at 3:24 PM, ron minnich wrote:
> > as for mmap, there's already a defacto mmap happening for executables. They
> > are not read into memory. In fact, the first instruction you run in a
> > binary results in a page fault.
> I thinking one could bring the same transparent/defacto memory mapping to
> read(2) and write(2), so the API need not change at all.
That gets... interesting, from an FS semantics point of view.
What does this code print? Does it change with buffer sizes?
fd = open("x", ORDWR);
pwrite(fd, "foo", 4, 0);
read(fd, buf, 4);
pwrite(fd, "bar", 4, 0);
print("%s\n", buf);
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