implement sys/uio/writev according to POSIX standard. This vectorized IO
API is needed by many logging libraries to achieve atomic logging
multiple strings.
This has been added in 0071a79532e8d664b734956a431d8c8c942cc25e to
support TLS destructors. Return value of __cxa_thread_atexit is supposed
to be the same as std::atexit - zero on success, non-zero on failure.
Update the code to do just that (also be consistent with llvm-libc's
existing atexit / at_quick_exit implementations).
Add LIBC_ASSERT statements to FixedVector implementation, and zero out
the memory when the elements are removed to flag out-of-bound access and
dangling pointer/reference access.
This change unmasks the bug in one of FixedVector uses for atexit
handlers: dangling reference use, which was actually led to crashes in
the wild (with prod blockstore implementation). Fix it in this CL.
While working on strftime I noticed some constants were being defined in
unexpected places. One thing led to another, and I ended up doing a
major cleanup of the time functions.
What's included:
All uses of <time.h> in /src and /test removed (except for LibcTest.cpp)
The various time constants have been moved to time_constants.h, and the
`time_constants` namespace.
struct tm gets its own type indirection header now.
The .yaml files should live next to the corresponding .h.def
files in libc/include/, rather than next to the implementation of
the tool in libc/utils/hdrgen/. As with the .h.def files, there
is no need for a yaml/ subdirectory under include/. This simpler
layout is more natural for maintenance and also simplifies build
integration outside the LLVM CMake build.
Summary:
This was originally a hacked together function that served to just
implement some features for OpenMP. That has been moved into OpenMP
itself now that we have exported RPC properly. This can now be deleted.
docgen relies on the convention that we have a file foo.cpp in
libc/src/\<header\>/. Because the above functions weren't in libc/src/strings/
but rather libc/src/string/, docgen could not find that we had implemented
these.
Rather than add special carve outs to docgen, let's fix up our sources for
these 7 functions to stick with the existing conventions the rest of the
codebase follows.
Link: #118860Fixes: #118875
It seems that LIBC_TARGET_OS_IS_MACOS and LIBC_TARGET_OS_IS_IPHONE were
never actually used in the code, so these definitions can be removed.
I came across these because libc++ now depends on llvm-libc to build
(for from_chars), and the unguarded use of TargetConditionals.h broke
some of our downstream configurations. There are some platforms for
which `__APPLE__` is defined but that don't provide TargetConditionals.h.
If there is a need to keep defining those, the compiler also provides
some uglier macro definitions like __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
that do not require including any header.
Add a `clock_gettime` emulation layer and use it to implement the `time`
entrypoint.
For windows, the monotonic clock is emulated using `QPC`.
The realtime clock is emulated using `GetSystemTimePreciseAsFileTime`.
The previous implementation of the ctype functions assumed ASCII.
This patch changes to a switch/case implementation that looks odd, but
actually is easier for the compiler to understand and optimize.
