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Diffstat (limited to 'ctr-std/src/sys/horizon/fs.rs')
| -rw-r--r-- | ctr-std/src/sys/horizon/fs.rs | 928 |
1 files changed, 0 insertions, 928 deletions
diff --git a/ctr-std/src/sys/horizon/fs.rs b/ctr-std/src/sys/horizon/fs.rs deleted file mode 100644 index f370d9c..0000000 --- a/ctr-std/src/sys/horizon/fs.rs +++ /dev/null @@ -1,928 +0,0 @@ -// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT -// file at the top-level directory of this distribution and at -// http://rust-lang.org/COPYRIGHT. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -use os::unix::prelude::*; - -use ffi::{CString, CStr, OsString, OsStr}; -use fmt; -use io::{self, Error, ErrorKind, SeekFrom}; -use libc::{self, c_int, mode_t}; -use mem; -use path::{Path, PathBuf}; -use ptr; -use sync::Arc; -use sys::fd::FileDesc; -use sys::time::SystemTime; -use sys::{cvt, cvt_r}; -use sys_common::{AsInner, FromInner}; - -#[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "l4re"))] -use libc::{stat64, fstat64, lstat64, off64_t, ftruncate64, lseek64, dirent64, readdir64_r, open64}; -#[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "android"))] -use libc::{fstatat, dirfd}; -#[cfg(target_os = "android")] -use libc::{stat as stat64, fstat as fstat64, lstat as lstat64, lseek64, - dirent as dirent64, open as open64}; -#[cfg(not(any(target_os = "linux", - target_os = "emscripten", - target_os = "l4re", - target_os = "android")))] -use libc::{stat as stat64, fstat as fstat64, lstat as lstat64, off_t as off64_t, - ftruncate as ftruncate64, lseek as lseek64, dirent as dirent64, open as open64}; -#[cfg(not(any(target_os = "linux", - target_os = "emscripten", - target_os = "solaris", - target_os = "l4re", - target_os = "fuchsia")))] -use libc::{readdir_r as readdir64_r}; - -pub struct File(FileDesc); - -#[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(Arc<InnerReadDir>); - -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 = "fuchsia"))] - 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 } - -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: 0 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: 0 as _, - })) - } - - #[cfg(any(target_os = "bitrig", - 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 = "bitrig", - target_os = "freebsd", - target_os = "openbsd", - target_os = "macos", - target_os = "ios")))] - pub fn created(&self) -> io::Result<SystemTime> { - 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.0.root, f) - } -} - -impl Iterator for ReadDir { - type Item = io::Result<DirEntry>; - - #[cfg(any(target_os = "solaris", target_os = "fuchsia"))] - fn next(&mut self) -> Option<io::Result<DirEntry>> { - 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.0.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() as *const u8; - 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")))] - fn next(&mut self) -> Option<io::Result<DirEntry>> { - unsafe { - let mut ret = DirEntry { - entry: mem::zeroed(), - dir: self.clone(), - }; - let mut entry_ptr = ptr::null_mut(); - loop { - if readdir64_r(self.0.dirp.0, &mut ret.entry, &mut entry_ptr) != 0 { - 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.0.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.0.dirp.0)})?; - let mut stat: stat64 = unsafe { mem::zeroed() }; - cvt(unsafe { - fstatat(fd, - self.entry.d_name.as_ptr() as *const u8, - &mut stat as *mut _ as *mut _, - libc::AT_SYMLINK_NOFOLLOW) - })?; - Ok(FileAttr { stat: 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 = "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 = "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 = "haiku", - target_os = "l4re", - target_os = "fuchsia"))] - pub fn ino(&self) -> u64 { - self.entry.d_ino as u64 - } - - #[cfg(any(target_os = "freebsd", - target_os = "openbsd", - target_os = "bitrig", - 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", - target_os = "bitrig"))] - fn name_bytes(&self) -> &[u8] { - unsafe { - ::slice::from_raw_parts(self.entry.d_name.as_ptr() as *const u8 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", - target_os = "horizon"))] - fn name_bytes(&self) -> &[u8] { - unsafe { - CStr::from_ptr(self.entry.d_name.as_ptr() as *const i8).to_bytes() - } - } - #[cfg(any(target_os = "solaris", - target_os = "fuchsia"))] - 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); - let fd = cvt_r(|| unsafe { - open64(path.as_ptr() as *const u8, flags, opts.mode as c_int) - })?; - let fd = FileDesc::new(fd); - - // Currently the standard library supports Linux 2.6.18 which did not - // have the O_CLOEXEC flag (passed above). If we're running on an older - // Linux kernel then the flag is just ignored by the OS. After we open - // the first file, we check whether it has CLOEXEC set. If it doesn't, - // we will explicitly ask for a CLOEXEC fd for every further file we - // open, if it does, we will skip that step. - // - // The CLOEXEC flag, however, is supported on versions of macOS/BSD/etc - // that we support, so we only do this on Linux currently. - #[cfg(target_os = "linux")] - fn ensure_cloexec(fd: &FileDesc) -> io::Result<()> { - use sync::atomic::{AtomicUsize, Ordering}; - - const OPEN_CLOEXEC_UNKNOWN: usize = 0; - const OPEN_CLOEXEC_SUPPORTED: usize = 1; - const OPEN_CLOEXEC_NOTSUPPORTED: usize = 2; - static OPEN_CLOEXEC: AtomicUsize = AtomicUsize::new(OPEN_CLOEXEC_UNKNOWN); - - let need_to_set; - match OPEN_CLOEXEC.load(Ordering::Relaxed) { - OPEN_CLOEXEC_UNKNOWN => { - need_to_set = !fd.get_cloexec()?; - OPEN_CLOEXEC.store(if need_to_set { - OPEN_CLOEXEC_NOTSUPPORTED - } else { - OPEN_CLOEXEC_SUPPORTED - }, Ordering::Relaxed); - }, - OPEN_CLOEXEC_SUPPORTED => need_to_set = false, - OPEN_CLOEXEC_NOTSUPPORTED => need_to_set = true, - _ => unreachable!(), - } - if need_to_set { - fd.set_cloexec()?; - } - Ok(()) - } - - #[cfg(not(target_os = "linux"))] - fn ensure_cloexec(_: &FileDesc) -> io::Result<()> { - Ok(()) - } - - ensure_cloexec(&fd)?; - Ok(File(fd)) - } - - pub fn file_attr(&self) -> io::Result<FileAttr> { - let mut stat: stat64 = unsafe { mem::zeroed() }; - cvt(unsafe { - fstat64(self.0.raw(), &mut stat) - })?; - Ok(FileAttr { stat: stat }) - } - - pub fn fsync(&self) -> io::Result<()> { - cvt_r(|| unsafe { libc::fsync(self.0.raw()) })?; - Ok(()) - } - - 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 ::sys::android::ftruncate64(self.0.raw(), size); - - #[cfg(not(target_os = "android"))] - return cvt_r(|| unsafe { - ftruncate64(self.0.raw(), size as off64_t) - }).map(|_| ()); - } - - pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> { - self.0.read(buf) - } - - 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_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), - }; - #[cfg(target_os = "emscripten")] - let pos = pos as i32; - 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() as *const u8, 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() as *const u8) }; - 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() as *const u8); - if ptr.is_null() { - Err(Error::last_os_error()) - } else { - let inner = InnerReadDir { dirp: Dir(ptr), root }; - Ok(ReadDir(Arc::new(inner))) - } - } -} - -pub fn unlink(p: &Path) -> io::Result<()> { - let p = cstr(p)?; - cvt(unsafe { libc::unlink(p.as_ptr() as *const u8) })?; - 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() as *const u8, new.as_ptr() as *const u8) })?; - Ok(()) -} - -pub fn set_perm(p: &Path, perm: FilePermissions) -> io::Result<()> { - let p = cstr(p)?; - cvt_r(|| unsafe { libc::chmod(p.as_ptr() as *const u8, perm.mode) })?; - Ok(()) -} - -pub fn rmdir(p: &Path) -> io::Result<()> { - let p = cstr(p)?; - cvt(unsafe { libc::rmdir(p.as_ptr() as *const u8) })?; - Ok(()) -} - -pub fn remove_dir_all(path: &Path) -> io::Result<()> { - let filetype = lstat(path)?.file_type(); - if filetype.is_symlink() { - unlink(path) - } else { - remove_dir_all_recursive(path) - } -} - -fn remove_dir_all_recursive(path: &Path) -> io::Result<()> { - for child in readdir(path)? { - let child = child?; - if child.file_type()?.is_dir() { - remove_dir_all_recursive(&child.path())?; - } else { - unlink(&child.path())?; - } - } - rmdir(path) -} - -pub fn readlink(p: &Path) -> io::Result<PathBuf> { - let c_path = cstr(p)?; - let p = c_path.as_ptr() as *const u8; - - 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() as *const u8, dst.as_ptr() as *const u8) })?; - 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() as *const u8, dst.as_ptr() as *const u8) })?; - Ok(()) -} - -pub fn stat(p: &Path) -> io::Result<FileAttr> { - let p = cstr(p)?; - let mut stat: stat64 = unsafe { mem::zeroed() }; - cvt(unsafe { - stat64(p.as_ptr() as *const u8, &mut stat as *mut _ as *mut _) - })?; - Ok(FileAttr { stat: stat }) -} - -pub fn lstat(p: &Path) -> io::Result<FileAttr> { - let p = cstr(p)?; - let mut stat: stat64 = unsafe { mem::zeroed() }; - cvt(unsafe { - lstat64(p.as_ptr() as *const u8, &mut stat as *mut _ as *mut _) - })?; - Ok(FileAttr { stat: 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() as *const u8, ptr::null_mut()); - if r.is_null() { - return Err(io::Error::last_os_error()) - } - buf = CStr::from_ptr(r as *const i8).to_bytes().to_vec(); - libc::free(r as *mut _); - } - Ok(PathBuf::from(OsString::from_vec(buf))) -} - -#[cfg(not(any(target_os = "linux", target_os = "android")))] -pub fn copy(from: &Path, to: &Path) -> io::Result<u64> { - use fs::File; - if !from.is_file() { - return Err(Error::new(ErrorKind::InvalidInput, - "the source path is not an existing regular file")) - } - - let mut reader = File::open(from)?; - let mut writer = File::create(to)?; - let perm = reader.metadata()?.permissions(); - - let ret = io::copy(&mut reader, &mut writer)?; - writer.set_permissions(perm)?; - Ok(ret) -} - -#[cfg(any(target_os = "linux", target_os = "android"))] -pub fn copy(from: &Path, to: &Path) -> io::Result<u64> { - use cmp; - use fs::File; - use sync::atomic::{AtomicBool, Ordering}; - - // Kernel prior to 4.5 don't have copy_file_range - // We store the availability in a global to avoid unneccessary 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, - ) - } - - if !from.is_file() { - return Err(Error::new(ErrorKind::InvalidInput, - "the source path is not an existing regular file")) - } - - let mut reader = File::open(from)?; - let mut writer = File::create(to)?; - let (perm, len) = { - let metadata = reader.metadata()?; - (metadata.permissions(), metadata.size()) - }; - - 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_value() 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::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) - assert_eq!(written, 0); - let ret = io::copy(&mut reader, &mut writer)?; - writer.set_permissions(perm)?; - return Ok(ret) - }, - _ => return Err(err), - } - } - } - } - writer.set_permissions(perm)?; - Ok(written) -} |