import sys
from _typeshed import (
    AnyStr_co,
    BytesPath,
    FileDescriptor,
    FileDescriptorLike,
    FileDescriptorOrPath,
    GenericPath,
    OpenBinaryMode,
    OpenBinaryModeReading,
    OpenBinaryModeUpdating,
    OpenBinaryModeWriting,
    OpenTextMode,
    ReadableBuffer,
    StrOrBytesPath,
    StrPath,
    SupportsLenAndGetItem,
    Unused,
    WriteableBuffer,
    structseq,
)
from abc import abstractmethod
from builtins import OSError
from collections.abc import Callable, Iterable, Iterator, Mapping, MutableMapping, Sequence
from contextlib import AbstractContextManager
from io import BufferedRandom, BufferedReader, BufferedWriter, FileIO, TextIOWrapper as _TextIOWrapper
from subprocess import Popen
from typing import (
    IO,
    Any,
    AnyStr,
    BinaryIO,
    Final,
    Generic,
    Literal,
    NoReturn,
    Protocol,
    TypeVar,
    final,
    overload,
    runtime_checkable,
)
from typing_extensions import Self, TypeAlias, Unpack, deprecated

from . import path as _path

if sys.version_info >= (3, 9):
    from types import GenericAlias

# This unnecessary alias is to work around various errors
path = _path

_T = TypeVar("_T")
_T1 = TypeVar("_T1")
_T2 = TypeVar("_T2")

# ----- os variables -----

error = OSError

supports_bytes_environ: bool

supports_dir_fd: set[Callable[..., Any]]
supports_fd: set[Callable[..., Any]]
supports_effective_ids: set[Callable[..., Any]]
supports_follow_symlinks: set[Callable[..., Any]]

if sys.platform != "win32":
    # Unix only
    PRIO_PROCESS: int
    PRIO_PGRP: int
    PRIO_USER: int

    F_LOCK: int
    F_TLOCK: int
    F_ULOCK: int
    F_TEST: 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

    if sys.platform != "linux" and sys.platform != "darwin":
        # In the os-module docs, these are marked as being available
        # on "Unix, not Emscripten, not WASI."
        # However, in the source code, a comment indicates they're "FreeBSD constants".
        # sys.platform could have one of many values on a FreeBSD Python build,
        # so the sys-module docs recommend doing `if sys.platform.startswith('freebsd')`
        # to detect FreeBSD builds. Unfortunately that would be too dynamic
        # for type checkers, however.
        SF_NODISKIO: int
        SF_MNOWAIT: int
        SF_SYNC: int

        if sys.version_info >= (3, 11):
            SF_NOCACHE: int

    if sys.platform == "linux":
        XATTR_SIZE_MAX: int
        XATTR_CREATE: int
        XATTR_REPLACE: int

    P_PID: int
    P_PGID: int
    P_ALL: int

    if sys.platform == "linux" and sys.version_info >= (3, 9):
        P_PIDFD: int

    WEXITED: int
    WSTOPPED: int
    WNOWAIT: int

    CLD_EXITED: int
    CLD_DUMPED: int
    CLD_TRAPPED: int
    CLD_CONTINUED: int

    if sys.version_info >= (3, 9):
        CLD_KILLED: int
        CLD_STOPPED: int

    # TODO: SCHED_RESET_ON_FORK not available on darwin?
    # TODO: SCHED_BATCH and SCHED_IDLE are linux only?
    SCHED_OTHER: int  # some flavors of Unix
    SCHED_BATCH: int  # some flavors of Unix
    SCHED_IDLE: int  # some flavors of Unix
    SCHED_SPORADIC: int  # some flavors of Unix
    SCHED_FIFO: int  # some flavors of Unix
    SCHED_RR: int  # some flavors of Unix
    SCHED_RESET_ON_FORK: int  # some flavors of Unix

if sys.platform != "win32":
    RTLD_LAZY: int
    RTLD_NOW: int
    RTLD_GLOBAL: int
    RTLD_LOCAL: int
    RTLD_NODELETE: int
    RTLD_NOLOAD: int

if sys.platform == "linux":
    RTLD_DEEPBIND: int
    GRND_NONBLOCK: int
    GRND_RANDOM: int

if sys.platform == "darwin" and sys.version_info >= (3, 12):
    PRIO_DARWIN_BG: int
    PRIO_DARWIN_NONUI: int
    PRIO_DARWIN_PROCESS: int
    PRIO_DARWIN_THREAD: int

SEEK_SET: int
SEEK_CUR: int
SEEK_END: int
if sys.platform != "win32":
    SEEK_DATA: int  # some flavors of Unix
    SEEK_HOLE: int  # some flavors of Unix

O_RDONLY: int
O_WRONLY: int
O_RDWR: int
O_APPEND: int
O_CREAT: int
O_EXCL: int
O_TRUNC: int
# We don't use sys.platform for O_* flags to denote platform-dependent APIs because some codes,
# including tests for mypy, use a more finer way than sys.platform before using these APIs
# See https://github.com/python/typeshed/pull/2286 for discussions
O_DSYNC: int  # Unix only
O_RSYNC: int  # Unix only
O_SYNC: int  # Unix only
O_NDELAY: int  # Unix only
O_NONBLOCK: int  # Unix only
O_NOCTTY: int  # Unix only
O_CLOEXEC: int  # Unix only
O_SHLOCK: int  # Unix only
O_EXLOCK: int  # Unix only
O_BINARY: int  # Windows only
O_NOINHERIT: int  # Windows only
O_SHORT_LIVED: int  # Windows only
O_TEMPORARY: int  # Windows only
O_RANDOM: int  # Windows only
O_SEQUENTIAL: int  # Windows only
O_TEXT: int  # Windows only
O_ASYNC: int  # Gnu extension if in C library
O_DIRECT: int  # Gnu extension if in C library
O_DIRECTORY: int  # Gnu extension if in C library
O_NOFOLLOW: int  # Gnu extension if in C library
O_NOATIME: int  # Gnu extension if in C library
O_PATH: int  # Gnu extension if in C library
O_TMPFILE: int  # Gnu extension if in C library
O_LARGEFILE: int  # Gnu extension if in C library
O_ACCMODE: int  # TODO: when does this exist?

if sys.platform != "win32" and sys.platform != "darwin":
    # posix, but apparently missing on macos
    ST_APPEND: int
    ST_MANDLOCK: int
    ST_NOATIME: int
    ST_NODEV: int
    ST_NODIRATIME: int
    ST_NOEXEC: int
    ST_RELATIME: int
    ST_SYNCHRONOUS: int
    ST_WRITE: int

if sys.platform != "win32":
    NGROUPS_MAX: int
    ST_NOSUID: int
    ST_RDONLY: int

curdir: str
pardir: str
sep: str
if sys.platform == "win32":
    altsep: str
else:
    altsep: str | None
extsep: str
pathsep: str
defpath: str
linesep: str
devnull: str
name: str

F_OK: int
R_OK: int
W_OK: int
X_OK: int

_EnvironCodeFunc: TypeAlias = Callable[[AnyStr], AnyStr]

class _Environ(MutableMapping[AnyStr, AnyStr], Generic[AnyStr]):
    encodekey: _EnvironCodeFunc[AnyStr]
    decodekey: _EnvironCodeFunc[AnyStr]
    encodevalue: _EnvironCodeFunc[AnyStr]
    decodevalue: _EnvironCodeFunc[AnyStr]
    if sys.version_info >= (3, 9):
        def __init__(
            self,
            data: MutableMapping[AnyStr, AnyStr],
            encodekey: _EnvironCodeFunc[AnyStr],
            decodekey: _EnvironCodeFunc[AnyStr],
            encodevalue: _EnvironCodeFunc[AnyStr],
            decodevalue: _EnvironCodeFunc[AnyStr],
        ) -> None: ...
    else:
        putenv: Callable[[AnyStr, AnyStr], object]
        unsetenv: Callable[[AnyStr, AnyStr], object]
        def __init__(
            self,
            data: MutableMapping[AnyStr, AnyStr],
            encodekey: _EnvironCodeFunc[AnyStr],
            decodekey: _EnvironCodeFunc[AnyStr],
            encodevalue: _EnvironCodeFunc[AnyStr],
            decodevalue: _EnvironCodeFunc[AnyStr],
            putenv: Callable[[AnyStr, AnyStr], object],
            unsetenv: Callable[[AnyStr, AnyStr], object],
        ) -> None: ...

    def setdefault(self, key: AnyStr, value: AnyStr) -> AnyStr: ...
    def copy(self) -> dict[AnyStr, AnyStr]: ...
    def __delitem__(self, key: AnyStr) -> None: ...
    def __getitem__(self, key: AnyStr) -> AnyStr: ...
    def __setitem__(self, key: AnyStr, value: AnyStr) -> None: ...
    def __iter__(self) -> Iterator[AnyStr]: ...
    def __len__(self) -> int: ...
    if sys.version_info >= (3, 9):
        def __or__(self, other: Mapping[_T1, _T2]) -> dict[AnyStr | _T1, AnyStr | _T2]: ...
        def __ror__(self, other: Mapping[_T1, _T2]) -> dict[AnyStr | _T1, AnyStr | _T2]: ...
        # We use @overload instead of a Union for reasons similar to those given for
        # overloading MutableMapping.update in stdlib/typing.pyi
        # The type: ignore is needed due to incompatible __or__/__ior__ signatures
        @overload  # type: ignore[misc]
        def __ior__(self, other: Mapping[AnyStr, AnyStr]) -> Self: ...
        @overload
        def __ior__(self, other: Iterable[tuple[AnyStr, AnyStr]]) -> Self: ...

environ: _Environ[str]
if sys.platform != "win32":
    environb: _Environ[bytes]

if sys.version_info >= (3, 11) or sys.platform != "win32":
    EX_OK: int

if sys.platform != "win32":
    confstr_names: dict[str, int]
    pathconf_names: dict[str, int]
    sysconf_names: dict[str, int]

    EX_USAGE: int
    EX_DATAERR: int
    EX_NOINPUT: int
    EX_NOUSER: int
    EX_NOHOST: int
    EX_UNAVAILABLE: int
    EX_SOFTWARE: int
    EX_OSERR: int
    EX_OSFILE: int
    EX_CANTCREAT: int
    EX_IOERR: int
    EX_TEMPFAIL: int
    EX_PROTOCOL: int
    EX_NOPERM: int
    EX_CONFIG: int

# Exists on some Unix platforms, e.g. Solaris.
if sys.platform != "win32" and sys.platform != "darwin" and sys.platform != "linux":
    EX_NOTFOUND: int

P_NOWAIT: int
P_NOWAITO: int
P_WAIT: int
if sys.platform == "win32":
    P_DETACH: int
    P_OVERLAY: int

# wait()/waitpid() options
if sys.platform != "win32":
    WNOHANG: int  # Unix only
    WCONTINUED: int  # some Unix systems
    WUNTRACED: int  # Unix only

TMP_MAX: int  # Undocumented, but used by tempfile

# ----- os classes (structures) -----
@final
class stat_result(structseq[float], tuple[int, int, int, int, int, int, int, float, float, float]):
    # The constructor of this class takes an iterable of variable length (though it must be at least 10).
    #
    # However, this class behaves like a tuple of 10 elements,
    # no matter how long the iterable supplied to the constructor is.
    # https://github.com/python/typeshed/pull/6560#discussion_r767162532
    #
    # The 10 elements always present are st_mode, st_ino, st_dev, st_nlink,
    # st_uid, st_gid, st_size, st_atime, st_mtime, st_ctime.
    #
    # More items may be added at the end by some implementations.
    if sys.version_info >= (3, 10):
        __match_args__: Final = ("st_mode", "st_ino", "st_dev", "st_nlink", "st_uid", "st_gid", "st_size")

    @property
    def st_mode(self) -> int: ...  # protection bits,
    @property
    def st_ino(self) -> int: ...  # inode number,
    @property
    def st_dev(self) -> int: ...  # device,
    @property
    def st_nlink(self) -> int: ...  # number of hard links,
    @property
    def st_uid(self) -> int: ...  # user id of owner,
    @property
    def st_gid(self) -> int: ...  # group id of owner,
    @property
    def st_size(self) -> int: ...  # size of file, in bytes,
    @property
    def st_atime(self) -> float: ...  # time of most recent access,
    @property
    def st_mtime(self) -> float: ...  # time of most recent content modification,
    # platform dependent (time of most recent metadata change on Unix, or the time of creation on Windows)
    if sys.version_info >= (3, 12) and sys.platform == "win32":
        @property
        @deprecated(
            "Use st_birthtime instead to retrieve the file creation time. In the future, this property will contain the last metadata change time."
        )
        def st_ctime(self) -> float: ...
    else:
        @property
        def st_ctime(self) -> float: ...

    @property
    def st_atime_ns(self) -> int: ...  # time of most recent access, in nanoseconds
    @property
    def st_mtime_ns(self) -> int: ...  # time of most recent content modification in nanoseconds
    # platform dependent (time of most recent metadata change on Unix, or the time of creation on Windows) in nanoseconds
    @property
    def st_ctime_ns(self) -> int: ...
    if sys.platform == "win32":
        @property
        def st_file_attributes(self) -> int: ...
        @property
        def st_reparse_tag(self) -> int: ...
        if sys.version_info >= (3, 12):
            @property
            def st_birthtime(self) -> float: ...  # time of file creation in seconds
            @property
            def st_birthtime_ns(self) -> int: ...  # time of file creation in nanoseconds
    else:
        @property
        def st_blocks(self) -> int: ...  # number of blocks allocated for file
        @property
        def st_blksize(self) -> int: ...  # filesystem blocksize
        @property
        def st_rdev(self) -> int: ...  # type of device if an inode device
        if sys.platform != "linux":
            # These properties are available on MacOS, but not Ubuntu.
            # On other Unix systems (such as FreeBSD), the following attributes may be
            # available (but may be only filled out if root tries to use them):
            @property
            def st_gen(self) -> int: ...  # file generation number
            @property
            def st_birthtime(self) -> float: ...  # time of file creation in seconds
    if sys.platform == "darwin":
        @property
        def st_flags(self) -> int: ...  # user defined flags for file
    # Attributes documented as sometimes appearing, but deliberately omitted from the stub: `st_creator`, `st_rsize`, `st_type`.
    # See https://github.com/python/typeshed/pull/6560#issuecomment-991253327

@runtime_checkable
class PathLike(Protocol[AnyStr_co]):
    @abstractmethod
    def __fspath__(self) -> AnyStr_co: ...

@overload
def listdir(path: StrPath | None = None) -> list[str]: ...
@overload
def listdir(path: BytesPath) -> list[bytes]: ...
@overload
def listdir(path: int) -> list[str]: ...
@final
class DirEntry(Generic[AnyStr]):
    # This is what the scandir iterator yields
    # The constructor is hidden

    @property
    def name(self) -> AnyStr: ...
    @property
    def path(self) -> AnyStr: ...
    def inode(self) -> int: ...
    def is_dir(self, *, follow_symlinks: bool = True) -> bool: ...
    def is_file(self, *, follow_symlinks: bool = True) -> bool: ...
    def is_symlink(self) -> bool: ...
    def stat(self, *, follow_symlinks: bool = True) -> stat_result: ...
    def __fspath__(self) -> AnyStr: ...
    if sys.version_info >= (3, 9):
        def __class_getitem__(cls, item: Any) -> GenericAlias: ...
    if sys.version_info >= (3, 12):
        def is_junction(self) -> bool: ...

@final
class statvfs_result(structseq[int], tuple[int, int, int, int, int, int, int, int, int, int, int]):
    if sys.version_info >= (3, 10):
        __match_args__: Final = (
            "f_bsize",
            "f_frsize",
            "f_blocks",
            "f_bfree",
            "f_bavail",
            "f_files",
            "f_ffree",
            "f_favail",
            "f_flag",
            "f_namemax",
        )

    @property
    def f_bsize(self) -> int: ...
    @property
    def f_frsize(self) -> int: ...
    @property
    def f_blocks(self) -> int: ...
    @property
    def f_bfree(self) -> int: ...
    @property
    def f_bavail(self) -> int: ...
    @property
    def f_files(self) -> int: ...
    @property
    def f_ffree(self) -> int: ...
    @property
    def f_favail(self) -> int: ...
    @property
    def f_flag(self) -> int: ...
    @property
    def f_namemax(self) -> int: ...
    @property
    def f_fsid(self) -> int: ...

# ----- os function stubs -----
def fsencode(filename: StrOrBytesPath) -> bytes: ...
def fsdecode(filename: StrOrBytesPath) -> str: ...
@overload
def fspath(path: str) -> str: ...
@overload
def fspath(path: bytes) -> bytes: ...
@overload
def fspath(path: PathLike[AnyStr]) -> AnyStr: ...
def get_exec_path(env: Mapping[str, str] | None = None) -> list[str]: ...
def getlogin() -> str: ...
def getpid() -> int: ...
def getppid() -> int: ...
def strerror(code: int, /) -> str: ...
def umask(mask: int, /) -> int: ...
@final
class uname_result(structseq[str], tuple[str, str, str, str, str]):
    if sys.version_info >= (3, 10):
        __match_args__: Final = ("sysname", "nodename", "release", "version", "machine")

    @property
    def sysname(self) -> str: ...
    @property
    def nodename(self) -> str: ...
    @property
    def release(self) -> str: ...
    @property
    def version(self) -> str: ...
    @property
    def machine(self) -> str: ...

if sys.platform != "win32":
    def ctermid() -> str: ...
    def getegid() -> int: ...
    def geteuid() -> int: ...
    def getgid() -> int: ...
    def getgrouplist(user: str, group: int, /) -> list[int]: ...
    def getgroups() -> list[int]: ...  # Unix only, behaves differently on Mac
    def initgroups(username: str, gid: int, /) -> None: ...
    def getpgid(pid: int) -> int: ...
    def getpgrp() -> int: ...
    def getpriority(which: int, who: int) -> int: ...
    def setpriority(which: int, who: int, priority: int) -> None: ...
    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: ...
    def setgid(gid: int, /) -> None: ...
    def setgroups(groups: Sequence[int], /) -> None: ...
    def setpgrp() -> None: ...
    def setpgid(pid: int, pgrp: int, /) -> None: ...
    def setregid(rgid: int, egid: 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: ...
    def setuid(uid: int, /) -> None: ...
    def uname() -> uname_result: ...

@overload
def getenv(key: str) -> str | None: ...
@overload
def getenv(key: str, default: _T) -> str | _T: ...

if sys.platform != "win32":
    @overload
    def getenvb(key: bytes) -> bytes | None: ...
    @overload
    def getenvb(key: bytes, default: _T) -> bytes | _T: ...
    def putenv(name: StrOrBytesPath, value: StrOrBytesPath, /) -> None: ...
    def unsetenv(name: StrOrBytesPath, /) -> None: ...

else:
    def putenv(name: str, value: str, /) -> None: ...

    if sys.version_info >= (3, 9):
        def unsetenv(name: str, /) -> None: ...

_Opener: TypeAlias = Callable[[str, int], int]

@overload
def fdopen(
    fd: int,
    mode: OpenTextMode = "r",
    buffering: int = -1,
    encoding: str | None = None,
    errors: str | None = ...,
    newline: str | None = ...,
    closefd: bool = ...,
    opener: _Opener | None = ...,
) -> _TextIOWrapper: ...
@overload
def fdopen(
    fd: int,
    mode: OpenBinaryMode,
    buffering: Literal[0],
    encoding: None = None,
    errors: None = None,
    newline: None = None,
    closefd: bool = ...,
    opener: _Opener | None = ...,
) -> FileIO: ...
@overload
def fdopen(
    fd: int,
    mode: OpenBinaryModeUpdating,
    buffering: Literal[-1, 1] = -1,
    encoding: None = None,
    errors: None = None,
    newline: None = None,
    closefd: bool = ...,
    opener: _Opener | None = ...,
) -> BufferedRandom: ...
@overload
def fdopen(
    fd: int,
    mode: OpenBinaryModeWriting,
    buffering: Literal[-1, 1] = -1,
    encoding: None = None,
    errors: None = None,
    newline: None = None,
    closefd: bool = ...,
    opener: _Opener | None = ...,
) -> BufferedWriter: ...
@overload
def fdopen(
    fd: int,
    mode: OpenBinaryModeReading,
    buffering: Literal[-1, 1] = -1,
    encoding: None = None,
    errors: None = None,
    newline: None = None,
    closefd: bool = ...,
    opener: _Opener | None = ...,
) -> BufferedReader: ...
@overload
def fdopen(
    fd: int,
    mode: OpenBinaryMode,
    buffering: int = -1,
    encoding: None = None,
    errors: None = None,
    newline: None = None,
    closefd: bool = ...,
    opener: _Opener | None = ...,
) -> BinaryIO: ...
@overload
def fdopen(
    fd: int,
    mode: str,
    buffering: int = -1,
    encoding: str | None = None,
    errors: str | None = ...,
    newline: str | None = ...,
    closefd: bool = ...,
    opener: _Opener | None = ...,
) -> IO[Any]: ...
def close(fd: int) -> None: ...
def closerange(fd_low: int, fd_high: int, /) -> None: ...
def device_encoding(fd: int) -> str | None: ...
def dup(fd: int, /) -> int: ...
def dup2(fd: int, fd2: int, inheritable: bool = True) -> int: ...
def fstat(fd: int) -> stat_result: ...
def ftruncate(fd: int, length: int, /) -> None: ...
def fsync(fd: FileDescriptorLike) -> None: ...
def isatty(fd: int, /) -> bool: ...

if sys.platform != "win32" and sys.version_info >= (3, 11):
    def login_tty(fd: int, /) -> None: ...

if sys.version_info >= (3, 11):
    def lseek(fd: int, position: int, whence: int, /) -> int: ...

else:
    def lseek(fd: int, position: int, how: int, /) -> int: ...

def open(path: StrOrBytesPath, flags: int, mode: int = 0o777, *, dir_fd: int | None = None) -> int: ...
def pipe() -> tuple[int, int]: ...
def read(fd: int, length: int, /) -> bytes: ...

if sys.version_info >= (3, 12) or sys.platform != "win32":
    def get_blocking(fd: int, /) -> bool: ...
    def set_blocking(fd: int, blocking: bool, /) -> None: ...

if sys.platform != "win32":
    def fchmod(fd: int, mode: int) -> None: ...
    def fchown(fd: int, uid: int, gid: int) -> None: ...
    def fpathconf(fd: int, name: str | int, /) -> int: ...
    def fstatvfs(fd: int, /) -> statvfs_result: ...
    def lockf(fd: int, command: int, length: int, /) -> None: ...
    def openpty() -> tuple[int, int]: ...  # some flavors of Unix
    if sys.platform != "darwin":
        def fdatasync(fd: FileDescriptorLike) -> None: ...
        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: ReadableBuffer, offset: int, /) -> int: ...
    # In CI, stubtest sometimes reports that these are available on MacOS, sometimes not
    def preadv(fd: int, buffers: SupportsLenAndGetItem[WriteableBuffer], offset: int, flags: int = 0, /) -> int: ...
    def pwritev(fd: int, buffers: SupportsLenAndGetItem[ReadableBuffer], offset: int, flags: int = 0, /) -> int: ...
    if sys.platform != "darwin":
        if sys.version_info >= (3, 10):
            RWF_APPEND: int  # docs say available on 3.7+, stubtest says otherwise
        RWF_DSYNC: int
        RWF_SYNC: int
        RWF_HIPRI: int
        RWF_NOWAIT: int

    if sys.platform == "linux":
        def sendfile(out_fd: FileDescriptor, in_fd: FileDescriptor, offset: int | None, count: int) -> int: ...
    else:
        def sendfile(
            out_fd: FileDescriptor,
            in_fd: FileDescriptor,
            offset: int,
            count: int,
            headers: Sequence[ReadableBuffer] = ...,
            trailers: Sequence[ReadableBuffer] = ...,
            flags: int = 0,
        ) -> int: ...  # FreeBSD and Mac OS X only

    def readv(fd: int, buffers: SupportsLenAndGetItem[WriteableBuffer], /) -> int: ...
    def writev(fd: int, buffers: SupportsLenAndGetItem[ReadableBuffer], /) -> int: ...

@final
class terminal_size(structseq[int], tuple[int, int]):
    if sys.version_info >= (3, 10):
        __match_args__: Final = ("columns", "lines")

    @property
    def columns(self) -> int: ...
    @property
    def lines(self) -> int: ...

def get_terminal_size(fd: int = ..., /) -> terminal_size: ...
def get_inheritable(fd: int, /) -> bool: ...
def set_inheritable(fd: int, inheritable: bool, /) -> None: ...

if sys.platform == "win32":
    def get_handle_inheritable(handle: int, /) -> bool: ...
    def set_handle_inheritable(handle: int, inheritable: bool, /) -> None: ...

if sys.platform != "win32":
    # Unix only
    def tcgetpgrp(fd: int, /) -> int: ...
    def tcsetpgrp(fd: int, pgid: int, /) -> None: ...
    def ttyname(fd: int, /) -> str: ...

def write(fd: int, data: ReadableBuffer, /) -> int: ...
def access(
    path: FileDescriptorOrPath, mode: int, *, dir_fd: int | None = None, effective_ids: bool = False, follow_symlinks: bool = True
) -> bool: ...
def chdir(path: FileDescriptorOrPath) -> None: ...

if sys.platform != "win32":
    def fchdir(fd: FileDescriptorLike) -> None: ...

def getcwd() -> str: ...
def getcwdb() -> bytes: ...
def chmod(path: FileDescriptorOrPath, mode: int, *, dir_fd: int | None = None, follow_symlinks: bool = True) -> None: ...

if sys.platform != "win32" and sys.platform != "linux":
    def chflags(path: StrOrBytesPath, flags: int, follow_symlinks: bool = True) -> None: ...  # some flavors of Unix
    def lchflags(path: StrOrBytesPath, flags: int) -> None: ...
    def lchmod(path: StrOrBytesPath, mode: int) -> None: ...

if sys.platform != "win32":
    def chroot(path: StrOrBytesPath) -> None: ...
    def chown(
        path: FileDescriptorOrPath, uid: int, gid: int, *, dir_fd: int | None = None, follow_symlinks: bool = True
    ) -> None: ...
    def lchown(path: StrOrBytesPath, uid: int, gid: int) -> None: ...

def link(
    src: StrOrBytesPath,
    dst: StrOrBytesPath,
    *,
    src_dir_fd: int | None = None,
    dst_dir_fd: int | None = None,
    follow_symlinks: bool = True,
) -> None: ...
def lstat(path: StrOrBytesPath, *, dir_fd: int | None = None) -> stat_result: ...
def mkdir(path: StrOrBytesPath, mode: int = 0o777, *, dir_fd: int | None = None) -> None: ...

if sys.platform != "win32":
    def mkfifo(path: StrOrBytesPath, mode: int = 0o666, *, dir_fd: int | None = None) -> None: ...  # Unix only

def makedirs(name: StrOrBytesPath, mode: int = 0o777, exist_ok: bool = False) -> None: ...

if sys.platform != "win32":
    def mknod(path: StrOrBytesPath, mode: int = 0o600, device: int = 0, *, dir_fd: int | None = None) -> None: ...
    def major(device: int, /) -> int: ...
    def minor(device: int, /) -> int: ...
    def makedev(major: int, minor: int, /) -> int: ...
    def pathconf(path: FileDescriptorOrPath, name: str | int) -> int: ...  # Unix only

def readlink(path: GenericPath[AnyStr], *, dir_fd: int | None = None) -> AnyStr: ...
def remove(path: StrOrBytesPath, *, dir_fd: int | None = None) -> None: ...
def removedirs(name: StrOrBytesPath) -> None: ...
def rename(src: StrOrBytesPath, dst: StrOrBytesPath, *, src_dir_fd: int | None = None, dst_dir_fd: int | None = None) -> None: ...
def renames(old: StrOrBytesPath, new: StrOrBytesPath) -> None: ...
def replace(
    src: StrOrBytesPath, dst: StrOrBytesPath, *, src_dir_fd: int | None = None, dst_dir_fd: int | None = None
) -> None: ...
def rmdir(path: StrOrBytesPath, *, dir_fd: int | None = None) -> None: ...

class _ScandirIterator(Iterator[DirEntry[AnyStr]], AbstractContextManager[_ScandirIterator[AnyStr]]):
    def __next__(self) -> DirEntry[AnyStr]: ...
    def __exit__(self, *args: Unused) -> None: ...
    def close(self) -> None: ...

@overload
def scandir(path: None = None) -> _ScandirIterator[str]: ...
@overload
def scandir(path: int) -> _ScandirIterator[str]: ...
@overload
def scandir(path: GenericPath[AnyStr]) -> _ScandirIterator[AnyStr]: ...
def stat(path: FileDescriptorOrPath, *, dir_fd: int | None = None, follow_symlinks: bool = True) -> stat_result: ...

if sys.platform != "win32":
    def statvfs(path: FileDescriptorOrPath) -> statvfs_result: ...  # Unix only

def symlink(
    src: StrOrBytesPath, dst: StrOrBytesPath, target_is_directory: bool = False, *, dir_fd: int | None = None
) -> None: ...

if sys.platform != "win32":
    def sync() -> None: ...  # Unix only

def truncate(path: FileDescriptorOrPath, length: int) -> None: ...  # Unix only up to version 3.4
def unlink(path: StrOrBytesPath, *, dir_fd: int | None = None) -> None: ...
def utime(
    path: FileDescriptorOrPath,
    times: tuple[int, int] | tuple[float, float] | None = None,
    *,
    ns: tuple[int, int] = ...,
    dir_fd: int | None = None,
    follow_symlinks: bool = True,
) -> None: ...

_OnError: TypeAlias = Callable[[OSError], object]

def walk(
    top: GenericPath[AnyStr], topdown: bool = True, onerror: _OnError | None = None, followlinks: bool = False
) -> Iterator[tuple[AnyStr, list[AnyStr], list[AnyStr]]]: ...

if sys.platform != "win32":
    @overload
    def fwalk(
        top: StrPath = ".",
        topdown: bool = True,
        onerror: _OnError | None = None,
        *,
        follow_symlinks: bool = False,
        dir_fd: int | None = None,
    ) -> Iterator[tuple[str, list[str], list[str], int]]: ...
    @overload
    def fwalk(
        top: BytesPath,
        topdown: bool = True,
        onerror: _OnError | None = None,
        *,
        follow_symlinks: bool = False,
        dir_fd: int | None = None,
    ) -> Iterator[tuple[bytes, list[bytes], list[bytes], int]]: ...
    if sys.platform == "linux":
        def getxattr(path: FileDescriptorOrPath, attribute: StrOrBytesPath, *, follow_symlinks: bool = True) -> bytes: ...
        def listxattr(path: FileDescriptorOrPath | None = None, *, follow_symlinks: bool = True) -> list[str]: ...
        def removexattr(path: FileDescriptorOrPath, attribute: StrOrBytesPath, *, follow_symlinks: bool = True) -> None: ...
        def setxattr(
            path: FileDescriptorOrPath,
            attribute: StrOrBytesPath,
            value: ReadableBuffer,
            flags: int = 0,
            *,
            follow_symlinks: bool = True,
        ) -> None: ...

def abort() -> NoReturn: ...

# These are defined as execl(file, *args) but the first *arg is mandatory.
def execl(file: StrOrBytesPath, *args: Unpack[tuple[StrOrBytesPath, Unpack[tuple[StrOrBytesPath, ...]]]]) -> NoReturn: ...
def execlp(file: StrOrBytesPath, *args: Unpack[tuple[StrOrBytesPath, Unpack[tuple[StrOrBytesPath, ...]]]]) -> NoReturn: ...

# These are: execle(file, *args, env) but env is pulled from the last element of the args.
def execle(
    file: StrOrBytesPath, *args: Unpack[tuple[StrOrBytesPath, Unpack[tuple[StrOrBytesPath, ...]], _ExecEnv]]
) -> NoReturn: ...
def execlpe(
    file: StrOrBytesPath, *args: Unpack[tuple[StrOrBytesPath, Unpack[tuple[StrOrBytesPath, ...]], _ExecEnv]]
) -> NoReturn: ...

# The docs say `args: tuple or list of strings`
# The implementation enforces tuple or list so we can't use Sequence.
# Not separating out PathLike[str] and PathLike[bytes] here because it doesn't make much difference
# in practice, and doing so would explode the number of combinations in this already long union.
# All these combinations are necessary due to list being invariant.
_ExecVArgs: TypeAlias = (
    tuple[StrOrBytesPath, ...]
    | list[bytes]
    | list[str]
    | list[PathLike[Any]]
    | list[bytes | str]
    | list[bytes | PathLike[Any]]
    | list[str | PathLike[Any]]
    | list[bytes | str | PathLike[Any]]
)
# Depending on the OS, the keys and values are passed either to
# PyUnicode_FSDecoder (which accepts str | ReadableBuffer) or to
# PyUnicode_FSConverter (which accepts StrOrBytesPath). For simplicity,
# we limit to str | bytes.
_ExecEnv: TypeAlias = Mapping[bytes, bytes | str] | Mapping[str, bytes | str]

def execv(path: StrOrBytesPath, argv: _ExecVArgs, /) -> NoReturn: ...
def execve(path: FileDescriptorOrPath, argv: _ExecVArgs, env: _ExecEnv) -> NoReturn: ...
def execvp(file: StrOrBytesPath, args: _ExecVArgs) -> NoReturn: ...
def execvpe(file: StrOrBytesPath, args: _ExecVArgs, env: _ExecEnv) -> NoReturn: ...
def _exit(status: int) -> NoReturn: ...
def kill(pid: int, signal: int, /) -> None: ...

if sys.platform != "win32":
    # Unix only
    def fork() -> int: ...
    def forkpty() -> tuple[int, int]: ...  # some flavors of Unix
    def killpg(pgid: int, signal: int, /) -> None: ...
    def nice(increment: int, /) -> int: ...
    if sys.platform != "darwin":
        def plock(op: int, /) -> None: ...  # ???op is int?

class _wrap_close(_TextIOWrapper):
    def __init__(self, stream: _TextIOWrapper, proc: Popen[str]) -> None: ...
    def close(self) -> int | None: ...  # type: ignore[override]

def popen(cmd: str, mode: str = "r", buffering: int = -1) -> _wrap_close: ...
def spawnl(mode: int, file: StrOrBytesPath, arg0: StrOrBytesPath, *args: StrOrBytesPath) -> int: ...
def spawnle(mode: int, file: StrOrBytesPath, arg0: StrOrBytesPath, *args: Any) -> int: ...  # Imprecise sig

if sys.platform != "win32":
    def spawnv(mode: int, file: StrOrBytesPath, args: _ExecVArgs) -> int: ...
    def spawnve(mode: int, file: StrOrBytesPath, args: _ExecVArgs, env: _ExecEnv) -> int: ...

else:
    def spawnv(mode: int, path: StrOrBytesPath, argv: _ExecVArgs, /) -> int: ...
    def spawnve(mode: int, path: StrOrBytesPath, argv: _ExecVArgs, env: _ExecEnv, /) -> int: ...

def system(command: StrOrBytesPath) -> int: ...
@final
class times_result(structseq[float], tuple[float, float, float, float, float]):
    if sys.version_info >= (3, 10):
        __match_args__: Final = ("user", "system", "children_user", "children_system", "elapsed")

    @property
    def user(self) -> float: ...
    @property
    def system(self) -> float: ...
    @property
    def children_user(self) -> float: ...
    @property
    def children_system(self) -> float: ...
    @property
    def elapsed(self) -> float: ...

def times() -> times_result: ...
def waitpid(pid: int, options: int, /) -> tuple[int, int]: ...

if sys.platform == "win32":
    if sys.version_info >= (3, 10):
        def startfile(
            filepath: StrOrBytesPath,
            operation: str = ...,
            arguments: str = "",
            cwd: StrOrBytesPath | None = None,
            show_cmd: int = 1,
        ) -> None: ...
    else:
        def startfile(filepath: StrOrBytesPath, operation: str = ...) -> None: ...

else:
    def spawnlp(mode: int, file: StrOrBytesPath, arg0: StrOrBytesPath, *args: StrOrBytesPath) -> int: ...
    def spawnlpe(mode: int, file: StrOrBytesPath, arg0: StrOrBytesPath, *args: Any) -> int: ...  # Imprecise signature
    def spawnvp(mode: int, file: StrOrBytesPath, args: _ExecVArgs) -> int: ...
    def spawnvpe(mode: int, file: StrOrBytesPath, args: _ExecVArgs, env: _ExecEnv) -> int: ...
    def wait() -> tuple[int, int]: ...  # Unix only
    if sys.platform != "darwin":
        @final
        class waitid_result(structseq[int], tuple[int, int, int, int, int]):
            if sys.version_info >= (3, 10):
                __match_args__: Final = ("si_pid", "si_uid", "si_signo", "si_status", "si_code")

            @property
            def si_pid(self) -> int: ...
            @property
            def si_uid(self) -> int: ...
            @property
            def si_signo(self) -> int: ...
            @property
            def si_status(self) -> int: ...
            @property
            def si_code(self) -> int: ...

        def waitid(idtype: int, ident: int, options: int, /) -> waitid_result | None: ...

    from resource import struct_rusage

    def wait3(options: int) -> tuple[int, int, struct_rusage]: ...
    def wait4(pid: int, options: int) -> tuple[int, int, struct_rusage]: ...
    def WCOREDUMP(status: int, /) -> bool: ...
    def WIFCONTINUED(status: int) -> bool: ...
    def WIFSTOPPED(status: int) -> bool: ...
    def WIFSIGNALED(status: int) -> bool: ...
    def WIFEXITED(status: int) -> bool: ...
    def WEXITSTATUS(status: int) -> int: ...
    def WSTOPSIG(status: int) -> int: ...
    def WTERMSIG(status: int) -> int: ...
    def posix_spawn(
        path: StrOrBytesPath,
        argv: _ExecVArgs,
        env: _ExecEnv,
        /,
        *,
        file_actions: Sequence[tuple[Any, ...]] | None = ...,
        setpgroup: int | None = ...,
        resetids: bool = ...,
        setsid: bool = ...,
        setsigmask: Iterable[int] = ...,
        setsigdef: Iterable[int] = ...,
        scheduler: tuple[Any, sched_param] | None = ...,
    ) -> int: ...
    def posix_spawnp(
        path: StrOrBytesPath,
        argv: _ExecVArgs,
        env: _ExecEnv,
        /,
        *,
        file_actions: Sequence[tuple[Any, ...]] | None = ...,
        setpgroup: int | None = ...,
        resetids: bool = ...,
        setsid: bool = ...,
        setsigmask: Iterable[int] = ...,
        setsigdef: Iterable[int] = ...,
        scheduler: tuple[Any, sched_param] | None = ...,
    ) -> int: ...
    POSIX_SPAWN_OPEN: int
    POSIX_SPAWN_CLOSE: int
    POSIX_SPAWN_DUP2: int

if sys.platform != "win32":
    @final
    class sched_param(structseq[int], tuple[int]):
        if sys.version_info >= (3, 10):
            __match_args__: Final = ("sched_priority",)

        def __new__(cls, sched_priority: int) -> Self: ...
        @property
        def sched_priority(self) -> int: ...

    def sched_get_priority_min(policy: int) -> int: ...  # some flavors of Unix
    def sched_get_priority_max(policy: int) -> int: ...  # some flavors of Unix
    def sched_yield() -> None: ...  # some flavors of Unix
    if sys.platform != "darwin":
        def sched_setscheduler(pid: int, policy: int, param: sched_param, /) -> None: ...  # some flavors of Unix
        def sched_getscheduler(pid: int, /) -> int: ...  # some flavors of Unix
        def sched_rr_get_interval(pid: int, /) -> float: ...  # some flavors of Unix
        def sched_setparam(pid: int, param: sched_param, /) -> None: ...  # some flavors of Unix
        def sched_getparam(pid: int, /) -> sched_param: ...  # some flavors of Unix
        def sched_setaffinity(pid: int, mask: Iterable[int], /) -> None: ...  # some flavors of Unix
        def sched_getaffinity(pid: int, /) -> set[int]: ...  # some flavors of Unix

def cpu_count() -> int | None: ...

if sys.platform != "win32":
    # Unix only
    def confstr(name: str | int, /) -> str | None: ...
    def getloadavg() -> tuple[float, float, float]: ...
    def sysconf(name: str | int, /) -> int: ...

if sys.platform == "linux":
    def getrandom(size: int, flags: int = 0) -> bytes: ...

def urandom(size: int, /) -> bytes: ...

if sys.platform != "win32":
    def register_at_fork(
        *,
        before: Callable[..., Any] | None = ...,
        after_in_parent: Callable[..., Any] | None = ...,
        after_in_child: Callable[..., Any] | None = ...,
    ) -> None: ...

if sys.platform == "win32":
    class _AddedDllDirectory:
        path: str | None
        def __init__(self, path: str | None, cookie: _T, remove_dll_directory: Callable[[_T], object]) -> None: ...
        def close(self) -> None: ...
        def __enter__(self) -> Self: ...
        def __exit__(self, *args: Unused) -> None: ...

    def add_dll_directory(path: str) -> _AddedDllDirectory: ...

if sys.platform == "linux":
    MFD_CLOEXEC: int
    MFD_ALLOW_SEALING: int
    MFD_HUGETLB: int
    MFD_HUGE_SHIFT: int
    MFD_HUGE_MASK: int
    MFD_HUGE_64KB: int
    MFD_HUGE_512KB: int
    MFD_HUGE_1MB: int
    MFD_HUGE_2MB: int
    MFD_HUGE_8MB: int
    MFD_HUGE_16MB: int
    MFD_HUGE_32MB: int
    MFD_HUGE_256MB: int
    MFD_HUGE_512MB: int
    MFD_HUGE_1GB: int
    MFD_HUGE_2GB: int
    MFD_HUGE_16GB: int
    def memfd_create(name: str, flags: int = ...) -> int: ...
    def copy_file_range(src: int, dst: int, count: int, offset_src: int | None = ..., offset_dst: int | None = ...) -> int: ...

if sys.version_info >= (3, 9):
    def waitstatus_to_exitcode(status: int) -> int: ...

    if sys.platform == "linux":
        def pidfd_open(pid: int, flags: int = ...) -> int: ...

if sys.version_info >= (3, 12) and sys.platform == "win32":
    def listdrives() -> list[str]: ...
    def listmounts(volume: str) -> list[str]: ...
    def listvolumes() -> list[str]: ...

if sys.version_info >= (3, 10) and sys.platform == "linux":
    EFD_CLOEXEC: int
    EFD_NONBLOCK: int
    EFD_SEMAPHORE: int
    SPLICE_F_MORE: int
    SPLICE_F_MOVE: int
    SPLICE_F_NONBLOCK: int
    def eventfd(initval: int, flags: int = 524288) -> FileDescriptor: ...
    def eventfd_read(fd: FileDescriptor) -> int: ...
    def eventfd_write(fd: FileDescriptor, value: int) -> None: ...
    def splice(
        src: FileDescriptor,
        dst: FileDescriptor,
        count: int,
        offset_src: int | None = ...,
        offset_dst: int | None = ...,
        flags: int = 0,
    ) -> int: ...

if sys.version_info >= (3, 12) and sys.platform == "linux":
    CLONE_FILES: int
    CLONE_FS: int
    CLONE_NEWCGROUP: int
    CLONE_NEWIPC: int
    CLONE_NEWNET: int
    CLONE_NEWNS: int
    CLONE_NEWPID: int
    CLONE_NEWTIME: int
    CLONE_NEWUSER: int
    CLONE_NEWUTS: int
    CLONE_SIGHAND: int
    CLONE_SYSVSEM: int
    CLONE_THREAD: int
    CLONE_VM: int
    def unshare(flags: int) -> None: ...
    def setns(fd: FileDescriptorLike, nstype: int = 0) -> None: ...
