resource: various fixes (#3747)

* resource: mark positional-only args
* resource: alias error to OSError
* resource: no longer seems incomplete

At least for Linux and Mac. Might be some things missing for FreeBSD

* resource: fix platform availability
* resource: update whitelist

stdlib/3/resource.pyi

@@ -1,7 +1,6 @@
 # Stubs for resource
 
-# NOTE: These are incomplete!
-
+import sys
 from typing import Tuple, Optional, NamedTuple
 
 RLIMIT_AS: int
@@ -10,20 +9,21 @@ RLIMIT_CPU: int
 RLIMIT_DATA: int
 RLIMIT_FSIZE: int
 RLIMIT_MEMLOCK: int
-RLIMIT_MSGQUEUE: int
-RLIMIT_NICE: int
 RLIMIT_NOFILE: int
 RLIMIT_NPROC: int
-RLIMIT_OFILE: int
 RLIMIT_RSS: int
-RLIMIT_RTPRIO: int
-RLIMIT_RTTIME: int
-RLIMIT_SIGPENDING: int
 RLIMIT_STACK: int
 RLIM_INFINITY: int
 RUSAGE_CHILDREN: int
 RUSAGE_SELF: int
-RUSAGE_THREAD: int
+if sys.platform == "linux":
+    RLIMIT_MSGQUEUE: int
+    RLIMIT_NICE: int
+    RLIMIT_OFILE: int
+    RLIMIT_RTPRIO: int
+    RLIMIT_RTTIME: int
+    RLIMIT_SIGPENDING: int
+    RUSAGE_THREAD: int
 
 class _RUsage(NamedTuple):
     ru_utime: float
@@ -44,10 +44,10 @@ class _RUsage(NamedTuple):
     ru_nivcsw: int
 
 def getpagesize() -> int: ...
-def getrlimit(resource: int) -> Tuple[int, int]: ...
-def getrusage(who: int) -> _RUsage: ...
-def prlimit(pid: int, resource: int, limits: Optional[Tuple[int, int]]) -> Tuple[int, int]: ...
-def setrlimit(resource: int, limits: Tuple[int, int]) -> None: ...
+def getrlimit(__resource: int) -> Tuple[int, int]: ...
+def getrusage(__who: int) -> _RUsage: ...
+def setrlimit(__resource: int, __limits: Tuple[int, int]) -> None: ...
+if sys.platform == "linux":
+    def prlimit(pid: int, resource: int, limits: Optional[Tuple[int, int]]) -> Tuple[int, int]: ...
 
-# NOTE: This is an alias of OSError in Python 3.3.
-class error(Exception): ...
+error = OSError

tests/stubtest_whitelists/py38.txt

@@ -198,9 +198,6 @@ pyclbr.Function.__init__
 queue.SimpleQueue.__init__
 random.Random.getrandbits
 random.getrandbits
-resource.getrlimit
-resource.getrusage
-resource.setrlimit
 secrets.SystemRandom.getstate
 secrets.compare_digest
 select.epoll.__exit__