Upgrade libuv to v1.46.0

uvloop/handles/process.pxd

@@ -34,7 +34,7 @@ cdef class UVProcess(UVHandle):
  cdef _init_env(self, dict env)
  cdef _init_files(self, _stdin, _stdout, _stderr)
  cdef _init_options(self, list args, dict env, cwd, start_new_session,
- _stdin, _stdout, _stderr)
+ _stdin, _stdout, _stderr, bint force_fork)
 
  cdef _close_after_spawn(self, int fd)
 

uvloop/handles/process.pyx

@@ -46,9 +46,17 @@ cdef class UVProcess(UVHandle):
  # callbacks have a chance to avoid casting *something* into UVHandle.
  self._handle.data = NULL
 
+ force_fork = False
+ if system.PLATFORM_IS_APPLE and not (
+ preexec_fn is None
+ and not pass_fds
+ ):
+ # see _execute_child() in CPython/subprocess.py
+ force_fork = True
+
  try:
  self._init_options(args, env, cwd, start_new_session,
- _stdin, _stdout, _stderr)
+ _stdin, _stdout, _stderr, force_fork)
 
  restore_inheritable = set()
  if pass_fds:
@@ -232,7 +240,7 @@ cdef class UVProcess(UVHandle):
  return ret
 
  cdef _init_options(self, list args, dict env, cwd, start_new_session,
- _stdin, _stdout, _stderr):
+ _stdin, _stdout, _stderr, bint force_fork):
 
  memset(&self.options, 0, sizeof(uv.uv_process_options_t))
 
@@ -246,6 +254,21 @@ cdef class UVProcess(UVHandle):
  if start_new_session:
  self.options.flags |= uv.UV_PROCESS_DETACHED
 
+ if force_fork:
+ # This is a hack to work around the change in libuv 1.44:
+ # > macos: use posix_spawn instead of fork
+ # where Python subprocess options like preexec_fn are
+ # crippled. CPython only uses posix_spawn under a pretty
+ # strict list of conditions (see subprocess.py), and falls
+ # back to using fork() otherwise. We'd like to simulate such
+ # behavior with libuv, but unfortunately libuv doesn't
+ # provide explicit API to choose such implementation detail.
+ # Based on current (libuv 1.46) behavior, setting
+ # UV_PROCESS_SETUID or UV_PROCESS_SETGID would reliably make
+ # libuv fallback to use fork, so let's just use it for now.
+ self.options.flags |= uv.UV_PROCESS_SETUID
+ self.options.uid = uv.getuid()
+
  if cwd is not None:
  cwd = os_fspath(cwd)
 

uvloop/includes/uv.pxd

@@ -1,5 +1,6 @@
 from libc.stdint cimport uint16_t, uint32_t, uint64_t, int64_t
 from posix.types cimport gid_t, uid_t
+from posix.unistd cimport getuid
 
 from . cimport system