mv std libs to library/

1 files changed, 0 insertions, 1310 deletions

diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
deleted file mode 100644
index acb18e6d064..00000000000
--- a/src/libstd/sys/unix/fs.rs
+++ /dev/null
@@ -1,1310 +0,0 @@
-use crate::os::unix::prelude::*;
-
-use crate::ffi::{CStr, CString, OsStr, OsString};
-use crate::fmt;
-use crate::io::{self, Error, ErrorKind, IoSlice, IoSliceMut, SeekFrom};
-use crate::mem;
-use crate::path::{Path, PathBuf};
-use crate::ptr;
-use crate::sync::Arc;
-use crate::sys::fd::FileDesc;
-use crate::sys::time::SystemTime;
-use crate::sys::{cvt, cvt_r};
-use crate::sys_common::{AsInner, FromInner};
-
-use libc::{c_int, mode_t};
-
-#[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "android"))]
-use libc::dirfd;
-#[cfg(any(target_os = "linux", target_os = "emscripten"))]
-use libc::fstatat64;
-#[cfg(not(any(
-    target_os = "linux",
-    target_os = "emscripten",
-    target_os = "solaris",
-    target_os = "illumos",
-    target_os = "l4re",
-    target_os = "fuchsia",
-    target_os = "redox"
-)))]
-use libc::readdir_r as readdir64_r;
-#[cfg(target_os = "android")]
-use libc::{
-    dirent as dirent64, fstat as fstat64, fstatat as fstatat64, lseek64, lstat as lstat64,
-    open as open64, stat as stat64,
-};
-#[cfg(not(any(
-    target_os = "linux",
-    target_os = "emscripten",
-    target_os = "l4re",
-    target_os = "android"
-)))]
-use libc::{
-    dirent as dirent64, fstat as fstat64, ftruncate as ftruncate64, lseek as lseek64,
-    lstat as lstat64, off_t as off64_t, open as open64, stat as stat64,
-};
-#[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "l4re"))]
-use libc::{
-    dirent64, fstat64, ftruncate64, lseek64, lstat64, off64_t, open64, readdir64_r, stat64,
-};
-
-pub use crate::sys_common::fs::remove_dir_all;
-
-pub struct File(FileDesc);
-
-// FIXME: This should be available on Linux with all `target_env`.
-// But currently only glibc exposes `statx` fn and structs.
-// We don't want to import unverified raw C structs here directly.
-// https://github.com/rust-lang/rust/pull/67774
-macro_rules! cfg_has_statx {
-    ({ $($then_tt:tt)* } else { $($else_tt:tt)* }) => {
-        cfg_if::cfg_if! {
-            if #[cfg(all(target_os = "linux", target_env = "gnu"))] {
-                $($then_tt)*
-            } else {
-                $($else_tt)*
-            }
-        }
-    };
-    ($($block_inner:tt)*) => {
-        #[cfg(all(target_os = "linux", target_env = "gnu"))]
-        {
-            $($block_inner)*
-        }
-    };
-}
-
-cfg_has_statx! {{
-    #[derive(Clone)]
-    pub struct FileAttr {
-        stat: stat64,
-        statx_extra_fields: Option<StatxExtraFields>,
-    }
-
-    #[derive(Clone)]
-    struct StatxExtraFields {
-        // This is needed to check if btime is supported by the filesystem.
-        stx_mask: u32,
-        stx_btime: libc::statx_timestamp,
-    }
-
-    // We prefer `statx` on Linux if available, which contains file creation time.
-    // Default `stat64` contains no creation time.
-    unsafe fn try_statx(
-        fd: c_int,
-        path: *const libc::c_char,
-        flags: i32,
-        mask: u32,
-    ) -> Option<io::Result<FileAttr>> {
-        use crate::sync::atomic::{AtomicU8, Ordering};
-
-        // Linux kernel prior to 4.11 or glibc prior to glibc 2.28 don't support `statx`
-        // We store the availability in global to avoid unnecessary syscalls.
-        // 0: Unknown
-        // 1: Not available
-        // 2: Available
-        static STATX_STATE: AtomicU8 = AtomicU8::new(0);
-        syscall! {
-            fn statx(
-                fd: c_int,
-                pathname: *const libc::c_char,
-                flags: c_int,
-                mask: libc::c_uint,
-                statxbuf: *mut libc::statx
-            ) -> c_int
-        }
-
-        match STATX_STATE.load(Ordering::Relaxed) {
-            0 => {
-                // It is a trick to call `statx` with NULL pointers to check if the syscall
-                // is available. According to the manual, it is expected to fail with EFAULT.
-                // We do this mainly for performance, since it is nearly hundreds times
-                // faster than a normal successful call.
-                let err = cvt(statx(0, ptr::null(), 0, libc::STATX_ALL, ptr::null_mut()))
-                    .err()
-                    .and_then(|e| e.raw_os_error());
-                // We don't check `err == Some(libc::ENOSYS)` because the syscall may be limited
-                // and returns `EPERM`. Listing all possible errors seems not a good idea.
-                // See: https://github.com/rust-lang/rust/issues/65662
-                if err != Some(libc::EFAULT) {
-                    STATX_STATE.store(1, Ordering::Relaxed);
-                    return None;
-                }
-                STATX_STATE.store(2, Ordering::Relaxed);
-            }
-            1 => return None,
-            _ => {}
-        }
-
-        let mut buf: libc::statx = mem::zeroed();
-        if let Err(err) = cvt(statx(fd, path, flags, mask, &mut buf)) {
-            return Some(Err(err));
-        }
-
-        // We cannot fill `stat64` exhaustively because of private padding fields.
-        let mut stat: stat64 = mem::zeroed();
-        // `c_ulong` on gnu-mips, `dev_t` otherwise
-        stat.st_dev = libc::makedev(buf.stx_dev_major, buf.stx_dev_minor) as _;
-        stat.st_ino = buf.stx_ino as libc::ino64_t;
-        stat.st_nlink = buf.stx_nlink as libc::nlink_t;
-        stat.st_mode = buf.stx_mode as libc::mode_t;
-        stat.st_uid = buf.stx_uid as libc::uid_t;
-        stat.st_gid = buf.stx_gid as libc::gid_t;
-        stat.st_rdev = libc::makedev(buf.stx_rdev_major, buf.stx_rdev_minor) as _;
-        stat.st_size = buf.stx_size as off64_t;
-        stat.st_blksize = buf.stx_blksize as libc::blksize_t;
-        stat.st_blocks = buf.stx_blocks as libc::blkcnt64_t;
-        stat.st_atime = buf.stx_atime.tv_sec as libc::time_t;
-        // `i64` on gnu-x86_64-x32, `c_ulong` otherwise.
-        stat.st_atime_nsec = buf.stx_atime.tv_nsec as _;
-        stat.st_mtime = buf.stx_mtime.tv_sec as libc::time_t;
-        stat.st_mtime_nsec = buf.stx_mtime.tv_nsec as _;
-        stat.st_ctime = buf.stx_ctime.tv_sec as libc::time_t;
-        stat.st_ctime_nsec = buf.stx_ctime.tv_nsec as _;
-
-        let extra = StatxExtraFields {
-            stx_mask: buf.stx_mask,
-            stx_btime: buf.stx_btime,
-        };
-
-        Some(Ok(FileAttr { stat, statx_extra_fields: Some(extra) }))
-    }
-
-} else {
-    #[derive(Clone)]
-    pub struct FileAttr {
-        stat: stat64,
-    }
-}}
-
-// all DirEntry's will have a reference to this struct
-struct InnerReadDir {
-    dirp: Dir,
-    root: PathBuf,
-}
-
-#[derive(Clone)]
-pub struct ReadDir {
-    inner: Arc<InnerReadDir>,
-    end_of_stream: bool,
-}
-
-struct Dir(*mut libc::DIR);
-
-unsafe impl Send for Dir {}
-unsafe impl Sync for Dir {}
-
-pub struct DirEntry {
-    entry: dirent64,
-    dir: ReadDir,
-    // We need to store an owned copy of the entry name
-    // on Solaris and Fuchsia because a) it uses a zero-length
-    // array to store the name, b) its lifetime between readdir
-    // calls is not guaranteed.
-    #[cfg(any(
-        target_os = "solaris",
-        target_os = "illumos",
-        target_os = "fuchsia",
-        target_os = "redox"
-    ))]
-    name: Box<[u8]>,
-}
-
-#[derive(Clone, Debug)]
-pub struct OpenOptions {
-    // generic
-    read: bool,
-    write: bool,
-    append: bool,
-    truncate: bool,
-    create: bool,
-    create_new: bool,
-    // system-specific
-    custom_flags: i32,
-    mode: mode_t,
-}
-
-#[derive(Clone, PartialEq, Eq, Debug)]
-pub struct FilePermissions {
-    mode: mode_t,
-}
-
-#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
-pub struct FileType {
-    mode: mode_t,
-}
-
-#[derive(Debug)]
-pub struct DirBuilder {
-    mode: mode_t,
-}
-
-cfg_has_statx! {{
-    impl FileAttr {
-        fn from_stat64(stat: stat64) -> Self {
-            Self { stat, statx_extra_fields: None }
-        }
-    }
-} else {
-    impl FileAttr {
-        fn from_stat64(stat: stat64) -> Self {
-            Self { stat }
-        }
-    }
-}}
-
-impl FileAttr {
-    pub fn size(&self) -> u64 {
-        self.stat.st_size as u64
-    }
-    pub fn perm(&self) -> FilePermissions {
-        FilePermissions { mode: (self.stat.st_mode as mode_t) }
-    }
-
-    pub fn file_type(&self) -> FileType {
-        FileType { mode: self.stat.st_mode as mode_t }
-    }
-}
-
-#[cfg(target_os = "netbsd")]
-impl FileAttr {
-    pub fn modified(&self) -> io::Result<SystemTime> {
-        Ok(SystemTime::from(libc::timespec {
-            tv_sec: self.stat.st_mtime as libc::time_t,
-            tv_nsec: self.stat.st_mtimensec as libc::c_long,
-        }))
-    }
-
-    pub fn accessed(&self) -> io::Result<SystemTime> {
-        Ok(SystemTime::from(libc::timespec {
-            tv_sec: self.stat.st_atime as libc::time_t,
-            tv_nsec: self.stat.st_atimensec as libc::c_long,
-        }))
-    }
-
-    pub fn created(&self) -> io::Result<SystemTime> {
-        Ok(SystemTime::from(libc::timespec {
-            tv_sec: self.stat.st_birthtime as libc::time_t,
-            tv_nsec: self.stat.st_birthtimensec as libc::c_long,
-        }))
-    }
-}
-
-#[cfg(not(target_os = "netbsd"))]
-impl FileAttr {
-    pub fn modified(&self) -> io::Result<SystemTime> {
-        Ok(SystemTime::from(libc::timespec {
-            tv_sec: self.stat.st_mtime as libc::time_t,
-            tv_nsec: self.stat.st_mtime_nsec as _,
-        }))
-    }
-
-    pub fn accessed(&self) -> io::Result<SystemTime> {
-        Ok(SystemTime::from(libc::timespec {
-            tv_sec: self.stat.st_atime as libc::time_t,
-            tv_nsec: self.stat.st_atime_nsec as _,
-        }))
-    }
-
-    #[cfg(any(
-        target_os = "freebsd",
-        target_os = "openbsd",
-        target_os = "macos",
-        target_os = "ios"
-    ))]
-    pub fn created(&self) -> io::Result<SystemTime> {
-        Ok(SystemTime::from(libc::timespec {
-            tv_sec: self.stat.st_birthtime as libc::time_t,
-            tv_nsec: self.stat.st_birthtime_nsec as libc::c_long,
-        }))
-    }
-
-    #[cfg(not(any(
-        target_os = "freebsd",
-        target_os = "openbsd",
-        target_os = "macos",
-        target_os = "ios"
-    )))]
-    pub fn created(&self) -> io::Result<SystemTime> {
-        cfg_has_statx! {
-            if let Some(ext) = &self.statx_extra_fields {
-                return if (ext.stx_mask & libc::STATX_BTIME) != 0 {
-                    Ok(SystemTime::from(libc::timespec {
-                        tv_sec: ext.stx_btime.tv_sec as libc::time_t,
-                        tv_nsec: ext.stx_btime.tv_nsec as _,
-                    }))
-                } else {
-                    Err(io::Error::new(
-                        io::ErrorKind::Other,
-                        "creation time is not available for the filesystem",
-                    ))
-                };
-            }
-        }
-
-        Err(io::Error::new(
-            io::ErrorKind::Other,
-            "creation time is not available on this platform \
-                            currently",
-        ))
-    }
-}
-
-impl AsInner<stat64> for FileAttr {
-    fn as_inner(&self) -> &stat64 {
-        &self.stat
-    }
-}
-
-impl FilePermissions {
-    pub fn readonly(&self) -> bool {
-        // check if any class (owner, group, others) has write permission
-        self.mode & 0o222 == 0
-    }
-
-    pub fn set_readonly(&mut self, readonly: bool) {
-        if readonly {
-            // remove write permission for all classes; equivalent to `chmod a-w <file>`
-            self.mode &= !0o222;
-        } else {
-            // add write permission for all classes; equivalent to `chmod a+w <file>`
-            self.mode |= 0o222;
-        }
-    }
-    pub fn mode(&self) -> u32 {
-        self.mode as u32
-    }
-}
-
-impl FileType {
-    pub fn is_dir(&self) -> bool {
-        self.is(libc::S_IFDIR)
-    }
-    pub fn is_file(&self) -> bool {
-        self.is(libc::S_IFREG)
-    }
-    pub fn is_symlink(&self) -> bool {
-        self.is(libc::S_IFLNK)
-    }
-
-    pub fn is(&self, mode: mode_t) -> bool {
-        self.mode & libc::S_IFMT == mode
-    }
-}
-
-impl FromInner<u32> for FilePermissions {
-    fn from_inner(mode: u32) -> FilePermissions {
-        FilePermissions { mode: mode as mode_t }
-    }
-}
-
-impl fmt::Debug for ReadDir {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        // This will only be called from std::fs::ReadDir, which will add a "ReadDir()" frame.
-        // Thus the result will be e g 'ReadDir("/home")'
-        fmt::Debug::fmt(&*self.inner.root, f)
-    }
-}
-
-impl Iterator for ReadDir {
-    type Item = io::Result<DirEntry>;
-
-    #[cfg(any(
-        target_os = "solaris",
-        target_os = "fuchsia",
-        target_os = "redox",
-        target_os = "illumos"
-    ))]
-    fn next(&mut self) -> Option<io::Result<DirEntry>> {
-        use crate::slice;
-
-        unsafe {
-            loop {
-                // Although readdir_r(3) would be a correct function to use here because
-                // of the thread safety, on Illumos and Fuchsia the readdir(3C) function
-                // is safe to use in threaded applications and it is generally preferred
-                // over the readdir_r(3C) function.
-                super::os::set_errno(0);
-                let entry_ptr = libc::readdir(self.inner.dirp.0);
-                if entry_ptr.is_null() {
-                    // NULL can mean either the end is reached or an error occurred.
-                    // So we had to clear errno beforehand to check for an error now.
-                    return match super::os::errno() {
-                        0 => None,
-                        e => Some(Err(Error::from_raw_os_error(e))),
-                    };
-                }
-
-                let name = (*entry_ptr).d_name.as_ptr();
-                let namelen = libc::strlen(name) as usize;
-
-                let ret = DirEntry {
-                    entry: *entry_ptr,
-                    name: slice::from_raw_parts(name as *const u8, namelen as usize)
-                        .to_owned()
-                        .into_boxed_slice(),
-                    dir: self.clone(),
-                };
-                if ret.name_bytes() != b"." && ret.name_bytes() != b".." {
-                    return Some(Ok(ret));
-                }
-            }
-        }
-    }
-
-    #[cfg(not(any(
-        target_os = "solaris",
-        target_os = "fuchsia",
-        target_os = "redox",
-        target_os = "illumos"
-    )))]
-    fn next(&mut self) -> Option<io::Result<DirEntry>> {
-        if self.end_of_stream {
-            return None;
-        }
-
-        unsafe {
-            let mut ret = DirEntry { entry: mem::zeroed(), dir: self.clone() };
-            let mut entry_ptr = ptr::null_mut();
-            loop {
-                if readdir64_r(self.inner.dirp.0, &mut ret.entry, &mut entry_ptr) != 0 {
-                    if entry_ptr.is_null() {
-                        // We encountered an error (which will be returned in this iteration), but
-                        // we also reached the end of the directory stream. The `end_of_stream`
-                        // flag is enabled to make sure that we return `None` in the next iteration
-                        // (instead of looping forever)
-                        self.end_of_stream = true;
-                    }
-                    return Some(Err(Error::last_os_error()));
-                }
-                if entry_ptr.is_null() {
-                    return None;
-                }
-                if ret.name_bytes() != b"." && ret.name_bytes() != b".." {
-                    return Some(Ok(ret));
-                }
-            }
-        }
-    }
-}
-
-impl Drop for Dir {
-    fn drop(&mut self) {
-        let r = unsafe { libc::closedir(self.0) };
-        debug_assert_eq!(r, 0);
-    }
-}
-
-impl DirEntry {
-    pub fn path(&self) -> PathBuf {
-        self.dir.inner.root.join(OsStr::from_bytes(self.name_bytes()))
-    }
-
-    pub fn file_name(&self) -> OsString {
-        OsStr::from_bytes(self.name_bytes()).to_os_string()
-    }
-
-    #[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "android"))]
-    pub fn metadata(&self) -> io::Result<FileAttr> {
-        let fd = cvt(unsafe { dirfd(self.dir.inner.dirp.0) })?;
-        let name = self.entry.d_name.as_ptr();
-
-        cfg_has_statx! {
-            if let Some(ret) = unsafe { try_statx(
-                fd,
-                name,
-                libc::AT_SYMLINK_NOFOLLOW | libc::AT_STATX_SYNC_AS_STAT,
-                libc::STATX_ALL,
-            ) } {
-                return ret;
-            }
-        }
-
-        let mut stat: stat64 = unsafe { mem::zeroed() };
-        cvt(unsafe { fstatat64(fd, name, &mut stat, libc::AT_SYMLINK_NOFOLLOW) })?;
-        Ok(FileAttr::from_stat64(stat))
-    }
-
-    #[cfg(not(any(target_os = "linux", target_os = "emscripten", target_os = "android")))]
-    pub fn metadata(&self) -> io::Result<FileAttr> {
-        lstat(&self.path())
-    }
-
-    #[cfg(any(target_os = "solaris", target_os = "illumos", target_os = "haiku"))]
-    pub fn file_type(&self) -> io::Result<FileType> {
-        lstat(&self.path()).map(|m| m.file_type())
-    }
-
-    #[cfg(not(any(target_os = "solaris", target_os = "illumos", target_os = "haiku")))]
-    pub fn file_type(&self) -> io::Result<FileType> {
-        match self.entry.d_type {
-            libc::DT_CHR => Ok(FileType { mode: libc::S_IFCHR }),
-            libc::DT_FIFO => Ok(FileType { mode: libc::S_IFIFO }),
-            libc::DT_LNK => Ok(FileType { mode: libc::S_IFLNK }),
-            libc::DT_REG => Ok(FileType { mode: libc::S_IFREG }),
-            libc::DT_SOCK => Ok(FileType { mode: libc::S_IFSOCK }),
-            libc::DT_DIR => Ok(FileType { mode: libc::S_IFDIR }),
-            libc::DT_BLK => Ok(FileType { mode: libc::S_IFBLK }),
-            _ => lstat(&self.path()).map(|m| m.file_type()),
-        }
-    }
-
-    #[cfg(any(
-        target_os = "macos",
-        target_os = "ios",
-        target_os = "linux",
-        target_os = "emscripten",
-        target_os = "android",
-        target_os = "solaris",
-        target_os = "illumos",
-        target_os = "haiku",
-        target_os = "l4re",
-        target_os = "fuchsia",
-        target_os = "redox"
-    ))]
-    pub fn ino(&self) -> u64 {
-        self.entry.d_ino as u64
-    }
-
-    #[cfg(any(
-        target_os = "freebsd",
-        target_os = "openbsd",
-        target_os = "netbsd",
-        target_os = "dragonfly"
-    ))]
-    pub fn ino(&self) -> u64 {
-        self.entry.d_fileno as u64
-    }
-
-    #[cfg(any(
-        target_os = "macos",
-        target_os = "ios",
-        target_os = "netbsd",
-        target_os = "openbsd",
-        target_os = "freebsd",
-        target_os = "dragonfly"
-    ))]
-    fn name_bytes(&self) -> &[u8] {
-        use crate::slice;
-        unsafe {
-            slice::from_raw_parts(
-                self.entry.d_name.as_ptr() as *const u8,
-                self.entry.d_namlen as usize,
-            )
-        }
-    }
-    #[cfg(any(
-        target_os = "android",
-        target_os = "linux",
-        target_os = "emscripten",
-        target_os = "l4re",
-        target_os = "haiku"
-    ))]
-    fn name_bytes(&self) -> &[u8] {
-        unsafe { CStr::from_ptr(self.entry.d_name.as_ptr()).to_bytes() }
-    }
-    #[cfg(any(
-        target_os = "solaris",
-        target_os = "illumos",
-        target_os = "fuchsia",
-        target_os = "redox"
-    ))]
-    fn name_bytes(&self) -> &[u8] {
-        &*self.name
-    }
-}
-
-impl OpenOptions {
-    pub fn new() -> OpenOptions {
-        OpenOptions {
-            // generic
-            read: false,
-            write: false,
-            append: false,
-            truncate: false,
-            create: false,
-            create_new: false,
-            // system-specific
-            custom_flags: 0,
-            mode: 0o666,
-        }
-    }
-
-    pub fn read(&mut self, read: bool) {
-        self.read = read;
-    }
-    pub fn write(&mut self, write: bool) {
-        self.write = write;
-    }
-    pub fn append(&mut self, append: bool) {
-        self.append = append;
-    }
-    pub fn truncate(&mut self, truncate: bool) {
-        self.truncate = truncate;
-    }
-    pub fn create(&mut self, create: bool) {
-        self.create = create;
-    }
-    pub fn create_new(&mut self, create_new: bool) {
-        self.create_new = create_new;
-    }
-
-    pub fn custom_flags(&mut self, flags: i32) {
-        self.custom_flags = flags;
-    }
-    pub fn mode(&mut self, mode: u32) {
-        self.mode = mode as mode_t;
-    }
-
-    fn get_access_mode(&self) -> io::Result<c_int> {
-        match (self.read, self.write, self.append) {
-            (true, false, false) => Ok(libc::O_RDONLY),
-            (false, true, false) => Ok(libc::O_WRONLY),
-            (true, true, false) => Ok(libc::O_RDWR),
-            (false, _, true) => Ok(libc::O_WRONLY | libc::O_APPEND),
-            (true, _, true) => Ok(libc::O_RDWR | libc::O_APPEND),
-            (false, false, false) => Err(Error::from_raw_os_error(libc::EINVAL)),
-        }
-    }
-
-    fn get_creation_mode(&self) -> io::Result<c_int> {
-        match (self.write, self.append) {
-            (true, false) => {}
-            (false, false) => {
-                if self.truncate || self.create || self.create_new {
-                    return Err(Error::from_raw_os_error(libc::EINVAL));
-                }
-            }
-            (_, true) => {
-                if self.truncate && !self.create_new {
-                    return Err(Error::from_raw_os_error(libc::EINVAL));
-                }
-            }
-        }
-
-        Ok(match (self.create, self.truncate, self.create_new) {
-            (false, false, false) => 0,
-            (true, false, false) => libc::O_CREAT,
-            (false, true, false) => libc::O_TRUNC,
-            (true, true, false) => libc::O_CREAT | libc::O_TRUNC,
-            (_, _, true) => libc::O_CREAT | libc::O_EXCL,
-        })
-    }
-}
-
-impl File {
-    pub fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> {
-        let path = cstr(path)?;
-        File::open_c(&path, opts)
-    }
-
-    pub fn open_c(path: &CStr, opts: &OpenOptions) -> io::Result<File> {
-        let flags = libc::O_CLOEXEC
-            | opts.get_access_mode()?
-            | opts.get_creation_mode()?
-            | (opts.custom_flags as c_int & !libc::O_ACCMODE);
-        // The third argument of `open64` is documented to have type `mode_t`. On
-        // some platforms (like macOS, where `open64` is actually `open`), `mode_t` is `u16`.
-        // However, since this is a variadic function, C integer promotion rules mean that on
-        // the ABI level, this still gets passed as `c_int` (aka `u32` on Unix platforms).
-        let fd = cvt_r(|| unsafe { open64(path.as_ptr(), flags, opts.mode as c_int) })?;
-        Ok(File(FileDesc::new(fd)))
-    }
-
-    pub fn file_attr(&self) -> io::Result<FileAttr> {
-        let fd = self.0.raw();
-
-        cfg_has_statx! {
-            if let Some(ret) = unsafe { try_statx(
-                fd,
-                b"\0" as *const _ as *const libc::c_char,
-                libc::AT_EMPTY_PATH | libc::AT_STATX_SYNC_AS_STAT,
-                libc::STATX_ALL,
-            ) } {
-                return ret;
-            }
-        }
-
-        let mut stat: stat64 = unsafe { mem::zeroed() };
-        cvt(unsafe { fstat64(fd, &mut stat) })?;
-        Ok(FileAttr::from_stat64(stat))
-    }
-
-    pub fn fsync(&self) -> io::Result<()> {
-        cvt_r(|| unsafe { os_fsync(self.0.raw()) })?;
-        return Ok(());
-
-        #[cfg(any(target_os = "macos", target_os = "ios"))]
-        unsafe fn os_fsync(fd: c_int) -> c_int {
-            libc::fcntl(fd, libc::F_FULLFSYNC)
-        }
-        #[cfg(not(any(target_os = "macos", target_os = "ios")))]
-        unsafe fn os_fsync(fd: c_int) -> c_int {
-            libc::fsync(fd)
-        }
-    }
-
-    pub fn datasync(&self) -> io::Result<()> {
-        cvt_r(|| unsafe { os_datasync(self.0.raw()) })?;
-        return Ok(());
-
-        #[cfg(any(target_os = "macos", target_os = "ios"))]
-        unsafe fn os_datasync(fd: c_int) -> c_int {
-            libc::fcntl(fd, libc::F_FULLFSYNC)
-        }
-        #[cfg(target_os = "linux")]
-        unsafe fn os_datasync(fd: c_int) -> c_int {
-            libc::fdatasync(fd)
-        }
-        #[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "linux")))]
-        unsafe fn os_datasync(fd: c_int) -> c_int {
-            libc::fsync(fd)
-        }
-    }
-
-    pub fn truncate(&self, size: u64) -> io::Result<()> {
-        #[cfg(target_os = "android")]
-        return crate::sys::android::ftruncate64(self.0.raw(), size);
-
-        #[cfg(not(target_os = "android"))]
-        {
-            use crate::convert::TryInto;
-            let size: off64_t =
-                size.try_into().map_err(|e| io::Error::new(io::ErrorKind::InvalidInput, e))?;
-            cvt_r(|| unsafe { ftruncate64(self.0.raw(), size) }).map(drop)
-        }
-    }
-
-    pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
-        self.0.read(buf)
-    }
-
-    pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        self.0.read_vectored(bufs)
-    }
-
-    #[inline]
-    pub fn is_read_vectored(&self) -> bool {
-        self.0.is_read_vectored()
-    }
-
-    pub fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
-        self.0.read_at(buf, offset)
-    }
-
-    pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
-        self.0.write(buf)
-    }
-
-    pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
-        self.0.write_vectored(bufs)
-    }
-
-    #[inline]
-    pub fn is_write_vectored(&self) -> bool {
-        self.0.is_write_vectored()
-    }
-
-    pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> {
-        self.0.write_at(buf, offset)
-    }
-
-    pub fn flush(&self) -> io::Result<()> {
-        Ok(())
-    }
-
-    pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> {
-        let (whence, pos) = match pos {
-            // Casting to `i64` is fine, too large values will end up as
-            // negative which will cause an error in `lseek64`.
-            SeekFrom::Start(off) => (libc::SEEK_SET, off as i64),
-            SeekFrom::End(off) => (libc::SEEK_END, off),
-            SeekFrom::Current(off) => (libc::SEEK_CUR, off),
-        };
-        let n = cvt(unsafe { lseek64(self.0.raw(), pos, whence) })?;
-        Ok(n as u64)
-    }
-
-    pub fn duplicate(&self) -> io::Result<File> {
-        self.0.duplicate().map(File)
-    }
-
-    pub fn fd(&self) -> &FileDesc {
-        &self.0
-    }
-
-    pub fn into_fd(self) -> FileDesc {
-        self.0
-    }
-
-    pub fn set_permissions(&self, perm: FilePermissions) -> io::Result<()> {
-        cvt_r(|| unsafe { libc::fchmod(self.0.raw(), perm.mode) })?;
-        Ok(())
-    }
-}
-
-impl DirBuilder {
-    pub fn new() -> DirBuilder {
-        DirBuilder { mode: 0o777 }
-    }
-
-    pub fn mkdir(&self, p: &Path) -> io::Result<()> {
-        let p = cstr(p)?;
-        cvt(unsafe { libc::mkdir(p.as_ptr(), self.mode) })?;
-        Ok(())
-    }
-
-    pub fn set_mode(&mut self, mode: u32) {
-        self.mode = mode as mode_t;
-    }
-}
-
-fn cstr(path: &Path) -> io::Result<CString> {
-    Ok(CString::new(path.as_os_str().as_bytes())?)
-}
-
-impl FromInner<c_int> for File {
-    fn from_inner(fd: c_int) -> File {
-        File(FileDesc::new(fd))
-    }
-}
-
-impl fmt::Debug for File {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        #[cfg(target_os = "linux")]
-        fn get_path(fd: c_int) -> Option<PathBuf> {
-            let mut p = PathBuf::from("/proc/self/fd");
-            p.push(&fd.to_string());
-            readlink(&p).ok()
-        }
-
-        #[cfg(target_os = "macos")]
-        fn get_path(fd: c_int) -> Option<PathBuf> {
-            // FIXME: The use of PATH_MAX is generally not encouraged, but it
-            // is inevitable in this case because macOS defines `fcntl` with
-            // `F_GETPATH` in terms of `MAXPATHLEN`, and there are no
-            // alternatives. If a better method is invented, it should be used
-            // instead.
-            let mut buf = vec![0; libc::PATH_MAX as usize];
-            let n = unsafe { libc::fcntl(fd, libc::F_GETPATH, buf.as_ptr()) };
-            if n == -1 {
-                return None;
-            }
-            let l = buf.iter().position(|&c| c == 0).unwrap();
-            buf.truncate(l as usize);
-            buf.shrink_to_fit();
-            Some(PathBuf::from(OsString::from_vec(buf)))
-        }
-
-        #[cfg(not(any(target_os = "linux", target_os = "macos")))]
-        fn get_path(_fd: c_int) -> Option<PathBuf> {
-            // FIXME(#24570): implement this for other Unix platforms
-            None
-        }
-
-        #[cfg(any(target_os = "linux", target_os = "macos"))]
-        fn get_mode(fd: c_int) -> Option<(bool, bool)> {
-            let mode = unsafe { libc::fcntl(fd, libc::F_GETFL) };
-            if mode == -1 {
-                return None;
-            }
-            match mode & libc::O_ACCMODE {
-                libc::O_RDONLY => Some((true, false)),
-                libc::O_RDWR => Some((true, true)),
-                libc::O_WRONLY => Some((false, true)),
-                _ => None,
-            }
-        }
-
-        #[cfg(not(any(target_os = "linux", target_os = "macos")))]
-        fn get_mode(_fd: c_int) -> Option<(bool, bool)> {
-            // FIXME(#24570): implement this for other Unix platforms
-            None
-        }
-
-        let fd = self.0.raw();
-        let mut b = f.debug_struct("File");
-        b.field("fd", &fd);
-        if let Some(path) = get_path(fd) {
-            b.field("path", &path);
-        }
-        if let Some((read, write)) = get_mode(fd) {
-            b.field("read", &read).field("write", &write);
-        }
-        b.finish()
-    }
-}
-
-pub fn readdir(p: &Path) -> io::Result<ReadDir> {
-    let root = p.to_path_buf();
-    let p = cstr(p)?;
-    unsafe {
-        let ptr = libc::opendir(p.as_ptr());
-        if ptr.is_null() {
-            Err(Error::last_os_error())
-        } else {
-            let inner = InnerReadDir { dirp: Dir(ptr), root };
-            Ok(ReadDir { inner: Arc::new(inner), end_of_stream: false })
-        }
-    }
-}
-
-pub fn unlink(p: &Path) -> io::Result<()> {
-    let p = cstr(p)?;
-    cvt(unsafe { libc::unlink(p.as_ptr()) })?;
-    Ok(())
-}
-
-pub fn rename(old: &Path, new: &Path) -> io::Result<()> {
-    let old = cstr(old)?;
-    let new = cstr(new)?;
-    cvt(unsafe { libc::rename(old.as_ptr(), new.as_ptr()) })?;
-    Ok(())
-}
-
-pub fn set_perm(p: &Path, perm: FilePermissions) -> io::Result<()> {
-    let p = cstr(p)?;
-    cvt_r(|| unsafe { libc::chmod(p.as_ptr(), perm.mode) })?;
-    Ok(())
-}
-
-pub fn rmdir(p: &Path) -> io::Result<()> {
-    let p = cstr(p)?;
-    cvt(unsafe { libc::rmdir(p.as_ptr()) })?;
-    Ok(())
-}
-
-pub fn readlink(p: &Path) -> io::Result<PathBuf> {
-    let c_path = cstr(p)?;
-    let p = c_path.as_ptr();
-
-    let mut buf = Vec::with_capacity(256);
-
-    loop {
-        let buf_read =
-            cvt(unsafe { libc::readlink(p, buf.as_mut_ptr() as *mut _, buf.capacity()) })? as usize;
-
-        unsafe {
-            buf.set_len(buf_read);
-        }
-
-        if buf_read != buf.capacity() {
-            buf.shrink_to_fit();
-
-            return Ok(PathBuf::from(OsString::from_vec(buf)));
-        }
-
-        // Trigger the internal buffer resizing logic of `Vec` by requiring
-        // more space than the current capacity. The length is guaranteed to be
-        // the same as the capacity due to the if statement above.
-        buf.reserve(1);
-    }
-}
-
-pub fn symlink(src: &Path, dst: &Path) -> io::Result<()> {
-    let src = cstr(src)?;
-    let dst = cstr(dst)?;
-    cvt(unsafe { libc::symlink(src.as_ptr(), dst.as_ptr()) })?;
-    Ok(())
-}
-
-pub fn link(src: &Path, dst: &Path) -> io::Result<()> {
-    let src = cstr(src)?;
-    let dst = cstr(dst)?;
-    cvt(unsafe { libc::link(src.as_ptr(), dst.as_ptr()) })?;
-    Ok(())
-}
-
-pub fn stat(p: &Path) -> io::Result<FileAttr> {
-    let p = cstr(p)?;
-
-    cfg_has_statx! {
-        if let Some(ret) = unsafe { try_statx(
-            libc::AT_FDCWD,
-            p.as_ptr(),
-            libc::AT_STATX_SYNC_AS_STAT,
-            libc::STATX_ALL,
-        ) } {
-            return ret;
-        }
-    }
-
-    let mut stat: stat64 = unsafe { mem::zeroed() };
-    cvt(unsafe { stat64(p.as_ptr(), &mut stat) })?;
-    Ok(FileAttr::from_stat64(stat))
-}
-
-pub fn lstat(p: &Path) -> io::Result<FileAttr> {
-    let p = cstr(p)?;
-
-    cfg_has_statx! {
-        if let Some(ret) = unsafe { try_statx(
-            libc::AT_FDCWD,
-            p.as_ptr(),
-            libc::AT_SYMLINK_NOFOLLOW | libc::AT_STATX_SYNC_AS_STAT,
-            libc::STATX_ALL,
-        ) } {
-            return ret;
-        }
-    }
-
-    let mut stat: stat64 = unsafe { mem::zeroed() };
-    cvt(unsafe { lstat64(p.as_ptr(), &mut stat) })?;
-    Ok(FileAttr::from_stat64(stat))
-}
-
-pub fn canonicalize(p: &Path) -> io::Result<PathBuf> {
-    let path = CString::new(p.as_os_str().as_bytes())?;
-    let buf;
-    unsafe {
-        let r = libc::realpath(path.as_ptr(), ptr::null_mut());
-        if r.is_null() {
-            return Err(io::Error::last_os_error());
-        }
-        buf = CStr::from_ptr(r).to_bytes().to_vec();
-        libc::free(r as *mut _);
-    }
-    Ok(PathBuf::from(OsString::from_vec(buf)))
-}
-
-fn open_from(from: &Path) -> io::Result<(crate::fs::File, crate::fs::Metadata)> {
-    use crate::fs::File;
-
-    let reader = File::open(from)?;
-    let metadata = reader.metadata()?;
-    if !metadata.is_file() {
-        return Err(Error::new(
-            ErrorKind::InvalidInput,
-            "the source path is not an existing regular file",
-        ));
-    }
-    Ok((reader, metadata))
-}
-
-fn open_to_and_set_permissions(
-    to: &Path,
-    reader_metadata: crate::fs::Metadata,
-) -> io::Result<(crate::fs::File, crate::fs::Metadata)> {
-    use crate::fs::OpenOptions;
-    use crate::os::unix::fs::{OpenOptionsExt, PermissionsExt};
-
-    let perm = reader_metadata.permissions();
-    let writer = OpenOptions::new()
-        // create the file with the correct mode right away
-        .mode(perm.mode())
-        .write(true)
-        .create(true)
-        .truncate(true)
-        .open(to)?;
-    let writer_metadata = writer.metadata()?;
-    if writer_metadata.is_file() {
-        // Set the correct file permissions, in case the file already existed.
-        // Don't set the permissions on already existing non-files like
-        // pipes/FIFOs or device nodes.
-        writer.set_permissions(perm)?;
-    }
-    Ok((writer, writer_metadata))
-}
-
-#[cfg(not(any(
-    target_os = "linux",
-    target_os = "android",
-    target_os = "macos",
-    target_os = "ios"
-)))]
-pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
-    let (mut reader, reader_metadata) = open_from(from)?;
-    let (mut writer, _) = open_to_and_set_permissions(to, reader_metadata)?;
-
-    io::copy(&mut reader, &mut writer)
-}
-
-#[cfg(any(target_os = "linux", target_os = "android"))]
-pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
-    use crate::cmp;
-    use crate::sync::atomic::{AtomicBool, Ordering};
-
-    // Kernel prior to 4.5 don't have copy_file_range
-    // We store the availability in a global to avoid unnecessary syscalls
-    static HAS_COPY_FILE_RANGE: AtomicBool = AtomicBool::new(true);
-
-    unsafe fn copy_file_range(
-        fd_in: libc::c_int,
-        off_in: *mut libc::loff_t,
-        fd_out: libc::c_int,
-        off_out: *mut libc::loff_t,
-        len: libc::size_t,
-        flags: libc::c_uint,
-    ) -> libc::c_long {
-        libc::syscall(libc::SYS_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags)
-    }
-
-    let (mut reader, reader_metadata) = open_from(from)?;
-    let len = reader_metadata.len();
-    let (mut writer, _) = open_to_and_set_permissions(to, reader_metadata)?;
-
-    let has_copy_file_range = HAS_COPY_FILE_RANGE.load(Ordering::Relaxed);
-    let mut written = 0u64;
-    while written < len {
-        let copy_result = if has_copy_file_range {
-            let bytes_to_copy = cmp::min(len - written, usize::MAX as u64) as usize;
-            let copy_result = unsafe {
-                // We actually don't have to adjust the offsets,
-                // because copy_file_range adjusts the file offset automatically
-                cvt(copy_file_range(
-                    reader.as_raw_fd(),
-                    ptr::null_mut(),
-                    writer.as_raw_fd(),
-                    ptr::null_mut(),
-                    bytes_to_copy,
-                    0,
-                ))
-            };
-            if let Err(ref copy_err) = copy_result {
-                match copy_err.raw_os_error() {
-                    Some(libc::ENOSYS) | Some(libc::EPERM) => {
-                        HAS_COPY_FILE_RANGE.store(false, Ordering::Relaxed);
-                    }
-                    _ => {}
-                }
-            }
-            copy_result
-        } else {
-            Err(io::Error::from_raw_os_error(libc::ENOSYS))
-        };
-        match copy_result {
-            Ok(ret) => written += ret as u64,
-            Err(err) => {
-                match err.raw_os_error() {
-                    Some(os_err)
-                        if os_err == libc::ENOSYS
-                            || os_err == libc::EXDEV
-                            || os_err == libc::EINVAL
-                            || os_err == libc::EPERM =>
-                    {
-                        // Try fallback io::copy if either:
-                        // - Kernel version is < 4.5 (ENOSYS)
-                        // - Files are mounted on different fs (EXDEV)
-                        // - copy_file_range is disallowed, for example by seccomp (EPERM)
-                        // - copy_file_range cannot be used with pipes or device nodes (EINVAL)
-                        assert_eq!(written, 0);
-                        return io::copy(&mut reader, &mut writer);
-                    }
-                    _ => return Err(err),
-                }
-            }
-        }
-    }
-    Ok(written)
-}
-
-#[cfg(any(target_os = "macos", target_os = "ios"))]
-pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
-    use crate::sync::atomic::{AtomicBool, Ordering};
-
-    const COPYFILE_ACL: u32 = 1 << 0;
-    const COPYFILE_STAT: u32 = 1 << 1;
-    const COPYFILE_XATTR: u32 = 1 << 2;
-    const COPYFILE_DATA: u32 = 1 << 3;
-
-    const COPYFILE_SECURITY: u32 = COPYFILE_STAT | COPYFILE_ACL;
-    const COPYFILE_METADATA: u32 = COPYFILE_SECURITY | COPYFILE_XATTR;
-    const COPYFILE_ALL: u32 = COPYFILE_METADATA | COPYFILE_DATA;
-
-    const COPYFILE_STATE_COPIED: u32 = 8;
-
-    #[allow(non_camel_case_types)]
-    type copyfile_state_t = *mut libc::c_void;
-    #[allow(non_camel_case_types)]
-    type copyfile_flags_t = u32;
-
-    extern "C" {
-        fn fcopyfile(
-            from: libc::c_int,
-            to: libc::c_int,
-            state: copyfile_state_t,
-            flags: copyfile_flags_t,
-        ) -> libc::c_int;
-        fn copyfile_state_alloc() -> copyfile_state_t;
-        fn copyfile_state_free(state: copyfile_state_t) -> libc::c_int;
-        fn copyfile_state_get(
-            state: copyfile_state_t,
-            flag: u32,
-            dst: *mut libc::c_void,
-        ) -> libc::c_int;
-    }
-
-    struct FreeOnDrop(copyfile_state_t);
-    impl Drop for FreeOnDrop {
-        fn drop(&mut self) {
-            // The code below ensures that `FreeOnDrop` is never a null pointer
-            unsafe {
-                // `copyfile_state_free` returns -1 if the `to` or `from` files
-                // cannot be closed. However, this is not considered this an
-                // error.
-                copyfile_state_free(self.0);
-            }
-        }
-    }
-
-    // MacOS prior to 10.12 don't support `fclonefileat`
-    // We store the availability in a global to avoid unnecessary syscalls
-    static HAS_FCLONEFILEAT: AtomicBool = AtomicBool::new(true);
-    syscall! {
-        fn fclonefileat(
-            srcfd: libc::c_int,
-            dst_dirfd: libc::c_int,
-            dst: *const libc::c_char,
-            flags: libc::c_int
-        ) -> libc::c_int
-    }
-
-    let (reader, reader_metadata) = open_from(from)?;
-
-    // Opportunistically attempt to create a copy-on-write clone of `from`
-    // using `fclonefileat`.
-    if HAS_FCLONEFILEAT.load(Ordering::Relaxed) {
-        let to = cstr(to)?;
-        let clonefile_result =
-            cvt(unsafe { fclonefileat(reader.as_raw_fd(), libc::AT_FDCWD, to.as_ptr(), 0) });
-        match clonefile_result {
-            Ok(_) => return Ok(reader_metadata.len()),
-            Err(err) => match err.raw_os_error() {
-                // `fclonefileat` will fail on non-APFS volumes, if the
-                // destination already exists, or if the source and destination
-                // are on different devices. In all these cases `fcopyfile`
-                // should succeed.
-                Some(libc::ENOTSUP) | Some(libc::EEXIST) | Some(libc::EXDEV) => (),
-                Some(libc::ENOSYS) => HAS_FCLONEFILEAT.store(false, Ordering::Relaxed),
-                _ => return Err(err),
-            },
-        }
-    }
-
-    // Fall back to using `fcopyfile` if `fclonefileat` does not succeed.
-    let (writer, writer_metadata) = open_to_and_set_permissions(to, reader_metadata)?;
-
-    // We ensure that `FreeOnDrop` never contains a null pointer so it is
-    // always safe to call `copyfile_state_free`
-    let state = unsafe {
-        let state = copyfile_state_alloc();
-        if state.is_null() {
-            return Err(crate::io::Error::last_os_error());
-        }
-        FreeOnDrop(state)
-    };
-
-    let flags = if writer_metadata.is_file() { COPYFILE_ALL } else { COPYFILE_DATA };
-
-    cvt(unsafe { fcopyfile(reader.as_raw_fd(), writer.as_raw_fd(), state.0, flags) })?;
-
-    let mut bytes_copied: libc::off_t = 0;
-    cvt(unsafe {
-        copyfile_state_get(
-            state.0,
-            COPYFILE_STATE_COPIED,
-            &mut bytes_copied as *mut libc::off_t as *mut libc::c_void,
-        )
-    })?;
-    Ok(bytes_copied as u64)
-}