os: fix platform availability (#3832)

stdlib/3/os/__init__.pyi

@@ -35,20 +35,22 @@ if sys.platform != 'win32':
     F_ULOCK: int
     F_TEST: int
 
-    POSIX_FADV_NORMAL: int
-    POSIX_FADV_SEQUENTIAL: int
-    POSIX_FADV_RANDOM: int
-    POSIX_FADV_NOREUSE: int
-    POSIX_FADV_WILLNEED: int
-    POSIX_FADV_DONTNEED: int
+    if sys.platform != "darwin":
+        POSIX_FADV_NORMAL: int
+        POSIX_FADV_SEQUENTIAL: int
+        POSIX_FADV_RANDOM: int
+        POSIX_FADV_NOREUSE: int
+        POSIX_FADV_WILLNEED: int
+        POSIX_FADV_DONTNEED: int
 
     SF_NODISKIO: int
     SF_MNOWAIT: int
     SF_SYNC: int
 
-    XATTR_SIZE_MAX: int  # Linux only
-    XATTR_CREATE: int  # Linux only
-    XATTR_REPLACE: int  # Linux only
+    if sys.platform == "linux":
+        XATTR_SIZE_MAX: int
+        XATTR_CREATE: int
+        XATTR_REPLACE: int
 
     P_PID: int
     P_PGID: int
@@ -338,8 +340,9 @@ if sys.platform != 'win32':
     def getpgrp() -> int: ...
     def getpriority(which: int, who: int) -> int: ...
     def setpriority(which: int, who: int, priority: int) -> None: ...
-    def getresuid() -> Tuple[int, int, int]: ...
-    def getresgid() -> Tuple[int, int, int]: ...
+    if sys.platform != "darwin":
+        def getresuid() -> Tuple[int, int, int]: ...
+        def getresgid() -> Tuple[int, int, int]: ...
     def getuid() -> int: ...
     def setegid(__egid: int) -> None: ...
     def seteuid(__euid: int) -> None: ...
@@ -348,8 +351,9 @@ if sys.platform != 'win32':
     def setpgrp() -> None: ...
     def setpgid(__pid: int, __pgrp: int) -> None: ...
     def setregid(__rgid: int, __egid: int) -> None: ...
-    def setresgid(rgid: int, egid: int, sgid: int) -> None: ...
-    def setresuid(ruid: int, euid: int, suid: int) -> None: ...
+    if sys.platform != "darwin":
+        def setresgid(rgid: int, egid: int, sgid: int) -> None: ...
+        def setresuid(ruid: int, euid: int, suid: int) -> None: ...
     def setreuid(__ruid: int, __euid: int) -> None: ...
     def getsid(__pid: int) -> int: ...
     def setsid() -> None: ...
@@ -390,7 +394,8 @@ if sys.platform != 'win32':
     # Unix only
     def fchmod(fd: int, mode: int) -> None: ...
     def fchown(fd: int, uid: int, gid: int) -> None: ...
-    def fdatasync(fd: int) -> None: ...  # Unix only, not Mac
+    if sys.platform != "darwin":
+        def fdatasync(fd: int) -> None: ...  # Unix only, not Mac
     def fpathconf(__fd: int, __name: Union[str, int]) -> int: ...
     def fstatvfs(__fd: int) -> statvfs_result: ...
     def ftruncate(__fd: int, __length: int) -> None: ...
@@ -399,9 +404,10 @@ if sys.platform != 'win32':
     def isatty(__fd: int) -> bool: ...
     def lockf(__fd: int, __command: int, __length: int) -> None: ...
     def openpty() -> Tuple[int, int]: ...  # some flavors of Unix
-    def pipe2(flags: int) -> Tuple[int, int]: ...  # some flavors of Unix
-    def posix_fallocate(fd: int, offset: int, length: int) -> None: ...
-    def posix_fadvise(fd: int, offset: int, length: int, advice: int) -> None: ...
+    if sys.platform != "darwin":
+        def pipe2(flags: int) -> Tuple[int, int]: ...  # some flavors of Unix
+        def posix_fallocate(fd: int, offset: int, length: int) -> None: ...
+        def posix_fadvise(fd: int, offset: int, length: int, advice: int) -> None: ...
     def pread(__fd: int, __length: int, __offset: int) -> bytes: ...
     def pwrite(__fd: int, __buffer: bytes, __offset: int) -> int: ...
     @overload
@@ -558,11 +564,12 @@ if sys.platform != 'win32':
         def fwalk(top: str = ..., topdown: bool = ...,
                   onerror: Optional[_OnError] = ..., *, follow_symlinks: bool = ...,
                   dir_fd: Optional[int] = ...) -> Iterator[Tuple[str, List[str], List[str], int]]: ...
-    def getxattr(path: _FdOrPathType, attribute: _PathType, *, follow_symlinks: bool = ...) -> bytes: ...  # Linux only
-    def listxattr(path: _FdOrPathType, *, follow_symlinks: bool = ...) -> List[str]: ...  # Linux only
-    def removexattr(path: _FdOrPathType, attribute: _PathType, *, follow_symlinks: bool = ...) -> None: ...  # Linux only
-    def setxattr(path: _FdOrPathType, attribute: _PathType, value: bytes, flags: int = ..., *,
-                 follow_symlinks: bool = ...) -> None: ...  # Linux only
+    if sys.platform == "linux":
+        def getxattr(path: _FdOrPathType, attribute: _PathType, *, follow_symlinks: bool = ...) -> bytes: ...
+        def listxattr(path: _FdOrPathType, *, follow_symlinks: bool = ...) -> List[str]: ...
+        def removexattr(path: _FdOrPathType, attribute: _PathType, *, follow_symlinks: bool = ...) -> None: ...
+        def setxattr(path: _FdOrPathType, attribute: _PathType, value: bytes, flags: int = ..., *,
+                     follow_symlinks: bool = ...) -> None: ...
 
 def abort() -> NoReturn: ...
 # These are defined as execl(file, *args) but the first *arg is mandatory.
@@ -590,7 +597,8 @@ if sys.platform != 'win32':
     def forkpty() -> Tuple[int, int]: ...  # some flavors of Unix
     def killpg(__pgid: int, __signal: int) -> None: ...
     def nice(__increment: int) -> int: ...
-    def plock(op: int) -> None: ...  # ???op is int?
+    if sys.platform != "darwin":
+        def plock(op: int) -> None: ...  # ???op is int?
 
 class _wrap_close(_TextIOWrapper):
     def close(self) -> Optional[int]: ...  # type: ignore
@@ -648,7 +656,8 @@ if sys.platform != 'win32':
     def getloadavg() -> Tuple[float, float, float]: ...
     def sysconf(__name: Union[str, int]) -> int: ...
 if sys.version_info >= (3, 6):
-    def getrandom(size: int, flags: int = ...) -> bytes: ...
+    if sys.platform == "linux":
+        def getrandom(size: int, flags: int = ...) -> bytes: ...
 def urandom(__size: int) -> bytes: ...
 
 if sys.version_info >= (3, 7):