This was originally added when we were using the mcount hooking
technique, to prevent the nop from floating above the frame pointer
creation. Now we use a better codegen technique for hooking so it's no
longer needed to sacrifice performance by using this flag.
When we removed the com suffix from ape binaries, we broke the build for
ape's python for any case-insensitive file system, i.e. Windows and XNU,
because there is a third_party/python/Python that gets mirrored in the o
directory with the python object files and clashes with the binary name.
This patch hacks around this by renaming the binary to "python3" so that
it no longer clashes with that directory.
At least on macOS, `strlen(getenv("TMPDIR"))` is 50. We now allow a /tmp
that takes up to 120 or so bytes to spell. Instead of overflowing, we do
a bounds check and the function fails successfully on even longer /tmps.
Fixes#1108 (os.tmpname crashes redbean)
This was a good idea back when we were only using it to build various
open source projects. However it no longer makes sense that many more
people are depending on cosmocc, to develop new software. Our tooling
shouldn't be making these kinds of decisions for the user.
This change solves the XNU crash loop mystery. Apple's documentation
claims to support this feature, but they only define the constant in
their header files. The kernel acknowledges thi SA_RESETHAND bit, by
clearing it from the sa_flags state, returns zero, and does nothing.
7d31fc3 made it safe to register ape with the binfmt P flag. Older files
will still get their paths passed via argv[0] and everything should just
work. This also restores the F flag that was rolled back alongside the P
flag; this seems like a good idea to me now. It makes it so /usr/bin/ape
is kind of part of the kernel; simply replacing the file will not change
the loader used. The binfmt will have to be reregistered as well.
ape/apeinstall.sh will already nag you if there's an existing binfmt for
ape. It might be nice to make it actually replace the registration.
This reverts commit df648fb174.
We're now able to pretty print a C++ backtrace upon crashing in pretty
much any runtime execution scenario. The default pledge sandbox policy
on Linux is now to return EPERM. If you call pledge and have debugging
functions linked (e.g. GetSymbolTable) then the symbol table shall get
loaded before any security policy is put in place. This change updates
build/bootstrap/fixupobj too and fixes some other sneaky build errors.
For this to work, a loader has to be able to tell the difference between
an ‘old’ and a ‘new’ binary. This is achieved via a repurposing of ELF’s
e_flags field. We previously tried to use the padding in e_ident for it,
but binutils was resetting it to zero in e.g. strip.
This introduces one new ELF flag for cosmopolitan binaries. It is called
`EF_APE_MODERN`. We choose 0x101ca75, "lol cat 5".
It should now be safe to install the ape loader binfmt registration with
the `P` flag.
It's now possible to safely print C++ backtraces from signal handlers.
This symbol demangler doesn't need malloc, tls, or even static memory.
Additionally, this change makes it 2x faster and adds test cases. It's
almost as performant and accurate as the libcxxabi implementation now.
I took one canonical IANA zone ID from each of the different colored
regions in this article, except those that do not observe DST and do
not have a Google office. See the "Time in Europe" Wikipedia article.
As to which canonical ID to use, this was somewhat arbitrary. Brussels
was obvious, as the de facto capital of the EU. For the rest, I mostly
just went with lexicographic ordering of the most recognizable options.
I've sorted the American zones. This Keeps the U.S. ones together but
does everything alphabetically otherwise. I've added the remaining
Canadian zones These have DST (and Newfoundland is off by a half-
hour from a UTC interval) so they cannot use Etc/. The Pacific/ zones
are sort of sorted. The Chathan Islands have been added. This is the
last of the zones I believe with a non-integer hour offset from UTC.
Cosmopolitan now supports 104 time zones. They're embedded inside any
binary that links the localtime() function. Doing so adds about 100kb
to the binary size. This change also gets time zones working properly
on Windows for the first time. It's not needed to have /etc/localtime
exist on Windows, since we can get this information from WIN32. We're
also now updated to the latest version of Paul Eggert's TZ library.
Signals are extremely difficult to unit test reliably. This is why
functions like sigsuspend() exist. When testing something else and
portably it becomes impossible without access to kernel internals.
OpenMP flakes in QEMU on one of my workstations. I don't think the
support is production worthy, because there's been issues on MacOS
additionally. It works great for every experiment I've used it for
though. However a flaky test is worse than no test at all. So it's
removed until someone takes an interest in productionizing it.
We have an optimized version of zlib from the Chromium project.
We need it for a lot of our libc services. It would be nice to export
this to user applications if we can, since projects like llamafile are
already depending on it under the private namespace, to avoid
needing to link zlib twice.
The feenableexcept() and fedisableexcept() APIs are now provided which
let you detect when NaNs appear the moment it happens from anywhere in
your program. Tests have also been added for the mission critical math
functions expf() and erff(), whose perfect operation has been assured.
See examples/trapping.c to see how to use this powerful functionality.
