In commit 714ce72882 (bootstrap: Make libuv available during bootstrap,
2017-09-13, v3.10.0-rc1~106^2) we modified libuv to use POSIX interfaces
during bootstrap. However, some code still expects `TARGET_OS_IPHONE`
to be defined on Apple platforms to either `0` or `1`. In order to
offer this, include `<TargetConditionals.h>` on Apple platforms even
when bootstrapping.
libuv upstream commit `2475296c` (build: make code compilable for iOS on
Xcode, 2020-01-18, v1.35.0~47) added a `defined(TARGET_OS_IPHONE)`
preprocessor condition, but `TARGET_OS_IPHONE` is always defined on
Apple to either 0 or 1.
libuv upstream commit `4a972bf0` (aix: Fix broken cmpxchgi() XL C++
specialization., 2019-09-06, v1.32.0~5) broke compilation with this
compiler. According to
https://www.ibm.com/support/knowledgecenter/SSGH3R_16.1.0/com.ibm.xlcpp161.aix.doc/migrate/migrate_to_xlclang.html
XLClang 16.1 for AIX does not support `__sync_val_compare_and_swap`.
The documentation suggests using C++11 atomic operations instead, but
this is C code. For now fall back to the non-atomic equivalent used
before so we can at least compile. Add a FIXME comment for this.
The `F_BARRIERFSYNC` constant was not added until the macOS 10.11 SDK.
Hard-code its value instead. This approach is backported from upstream
libuv PR 2334.
In commit beb991110d (Remove now-unused code once used on IRIX,
2019-01-11, v3.14.0-rc1~167^2) we removed remnants of IRIX support.
Also remove remnants of MIPSpro compiler support.
Headers in `uv/` can include each other without the `uv/` prefix. Using
the prefix assumes that the location of `uv/` is in the include file
search path, but it is possible to include `uv.h` via a longer path.
Some platforms (e.g. GNU/Hurd) do not define PATH_MAX. Add a few other
variants and a fallback constant. Also use alternatives where possible:
* For readlink(), use lstat() to read the length of the link first.
If it is not a symlink, report EINVAL before trying to allocate.
If the size reports as zero, fall back one of the PATH_MAX variants.
* For realpath(), POSIX 2008 allows us to pass a NULL buffer
to tell it to malloc() internally.
This patch was inspired by downstream patches in Debian packaging
for issues 897061 and 909011.
Issue: #18337
Upstream libuv commits:
* node-v0.6.0~28 (linux: use ioctl(FIONBIO) to set O_NONBLOCK, saves a syscall, 2011-10-29)
* v1.11.0~11 (unix: use async-signal safe functions between fork and exec, 2016-12-12)
left an asymmetry in the way O_NONBLOCK is set and cleared. Normally
ioctl/FIONBIO is used for both. However, uv_spawn uses fcntl/O_NONBLOCK
to clear O_NONBLOCK between fork and exec. This fails on Linux/sparc64
where setting via ioctl/FIONBIO actually sets two bits (in O_NDELAY)
that cause clearing via fcntl/O_NONBLOCK to be silently ignored (though
clearing via ioctl/FIONBIO or fcntl/O_NDELAY works).
Since CMake commit v3.11.0-rc1~117^2 (CTest: Re-implement test process
handling using libuv, 2017-12-10), CTest uses libuv. On Linux/sparc64
child processes have been started with non-blocking output pipes. This
can lead to write errors or lost output from children not prepared to
deal with `EAGAIN` on stdout or stderr.
Fix this for now by switching libuv back to fcntl/O_NONBLOCK to set and
clear O_NONBLOCK when compiled on Linux/sparc64.
LibUV-Issue: 1830
Fixes: #17941
Implement it on Linux, FreeBSD, and Windows for now, and fail with
UV_ENOTSUP on other platforms.
Backported from upstream libuv PR 1527, scheduled for inclusion
in libuv 2.0.
Implement it on Linux, FreeBSD, and Windows for now, and return
UV_ENOTSUP on other platforms.
Backported from upstream libuv PR 1527, scheduled for inclusion
in libuv 2.0.
BSD `signal(2)` semantics make some system calls (e.g. for `write`)
restartable when interrupted by a signal handler. Use `SA_RESTART` to
enable these semantics everywhere that supports them.
This is required by C++ stream libraries that interpret `EINTR` as any
other error, set `badbit`, and stop writing. I've observed this with
`libstdc++` during a `std::cout.flush()` call interrupted by `SIGCHLD`.
On UNIX, build only the parts of libuv we need for the filesystem,
process, and poll abstractions using the POSIX poll() backend. This
avoids many platform-specific conditions. On Windows, build all of
libuv; there are no conditional alternatives anyway.
