Fenrir
8 years ago
8 changed files with 3553 additions and 23 deletions
@ -0,0 +1,575 @@
@@ -0,0 +1,575 @@
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// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use os::unix::prelude::*; |
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use ffi::{CString, CStr, OsString, OsStr}; |
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use fmt; |
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use io::{self, Error, ErrorKind, SeekFrom}; |
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use libc::{self, c_int, mode_t}; |
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use mem; |
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use path::{Path, PathBuf}; |
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use ptr; |
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use sync::Arc; |
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use sys::fd::FileDesc; |
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use sys::time::SystemTime; |
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use sys::{cvt, cvt_r}; |
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use sys_common::{AsInner, FromInner}; |
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use libc::{stat as stat64, fstat as fstat64, lstat as lstat64, lseek as lseek64, |
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dirent as dirent64, open as open64, ftruncate as ftruncate64, off_t as off64_t}; |
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use libc::{readdir_r as readdir64_r}; |
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pub struct File(FileDesc); |
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#[derive(Clone)] |
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pub struct FileAttr { |
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stat: stat64, |
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} |
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pub struct ReadDir { |
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dirp: Dir, |
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root: Arc<PathBuf>, |
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} |
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struct Dir(*mut libc::DIR); |
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unsafe impl Send for Dir {} |
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unsafe impl Sync for Dir {} |
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pub struct DirEntry { |
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entry: dirent64, |
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root: Arc<PathBuf>, |
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} |
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#[derive(Clone, Debug)] |
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pub struct OpenOptions { |
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// generic
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read: bool, |
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write: bool, |
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append: bool, |
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truncate: bool, |
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create: bool, |
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create_new: bool, |
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// system-specific
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custom_flags: i32, |
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mode: mode_t, |
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} |
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#[derive(Clone, PartialEq, Eq, Debug)] |
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pub struct FilePermissions { mode: mode_t } |
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#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)] |
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pub struct FileType { mode: mode_t } |
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#[derive(Debug)] |
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pub struct DirBuilder { mode: mode_t } |
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impl FileAttr { |
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pub fn size(&self) -> u64 { self.stat.st_size as u64 } |
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pub fn perm(&self) -> FilePermissions { |
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FilePermissions { mode: (self.stat.st_mode as mode_t) & 0o777 } |
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} |
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pub fn file_type(&self) -> FileType { |
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FileType { mode: self.stat.st_mode as mode_t } |
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} |
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} |
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impl FileAttr { |
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pub fn modified(&self) -> io::Result<SystemTime> { |
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Ok(SystemTime::from(libc::timespec { |
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tv_sec: self.stat.st_mtime as libc::time_t, |
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tv_nsec: 0, |
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})) |
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} |
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pub fn accessed(&self) -> io::Result<SystemTime> { |
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Ok(SystemTime::from(libc::timespec { |
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tv_sec: self.stat.st_atime as libc::time_t, |
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tv_nsec: 0, |
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})) |
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} |
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pub fn created(&self) -> io::Result<SystemTime> { |
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Err(io::Error::new(io::ErrorKind::Other, |
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"creation time is not available on this platform \ |
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currently")) |
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} |
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} |
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impl AsInner<stat64> for FileAttr { |
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fn as_inner(&self) -> &stat64 { &self.stat } |
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} |
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impl FilePermissions { |
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pub fn readonly(&self) -> bool { self.mode & 0o222 == 0 } |
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pub fn set_readonly(&mut self, readonly: bool) { |
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if readonly { |
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self.mode &= !0o222; |
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} else { |
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self.mode |= 0o222; |
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} |
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} |
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pub fn mode(&self) -> u32 { self.mode as u32 } |
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} |
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impl FileType { |
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pub fn is_dir(&self) -> bool { self.is(libc::S_IFDIR) } |
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pub fn is_file(&self) -> bool { self.is(libc::S_IFREG) } |
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pub fn is_symlink(&self) -> bool { self.is(libc::S_IFLNK) } |
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pub fn is(&self, mode: mode_t) -> bool { self.mode & libc::S_IFMT == mode } |
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} |
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impl FromInner<u32> for FilePermissions { |
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fn from_inner(mode: u32) -> FilePermissions { |
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FilePermissions { mode: mode as mode_t } |
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} |
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} |
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impl fmt::Debug for ReadDir { |
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
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// This will only be called from std::fs::ReadDir, which will add a "ReadDir()" frame.
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// Thus the result will be e g 'ReadDir("/home")'
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fmt::Debug::fmt(&*self.root, f) |
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} |
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} |
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impl Iterator for ReadDir { |
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type Item = io::Result<DirEntry>; |
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fn next(&mut self) -> Option<io::Result<DirEntry>> { |
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unsafe { |
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let mut ret = DirEntry { |
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entry: mem::zeroed(), |
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root: self.root.clone() |
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}; |
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let mut entry_ptr = ptr::null_mut(); |
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loop { |
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if readdir64_r(self.dirp.0, &mut ret.entry, &mut entry_ptr) != 0 { |
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return Some(Err(Error::last_os_error())) |
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} |
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if entry_ptr.is_null() { |
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return None |
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} |
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if ret.name_bytes() != b"." && ret.name_bytes() != b".." { |
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return Some(Ok(ret)) |
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} |
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} |
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} |
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} |
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} |
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impl Drop for Dir { |
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fn drop(&mut self) { |
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let r = unsafe { libc::closedir(self.0) }; |
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debug_assert_eq!(r, 0); |
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} |
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} |
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impl DirEntry { |
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pub fn path(&self) -> PathBuf { |
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self.root.join(OsStr::from_bytes(self.name_bytes())) |
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} |
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pub fn file_name(&self) -> OsString { |
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OsStr::from_bytes(self.name_bytes()).to_os_string() |
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} |
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pub fn metadata(&self) -> io::Result<FileAttr> { |
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lstat(&self.path()) |
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} |
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pub fn file_type(&self) -> io::Result<FileType> { |
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match self.entry.d_type { |
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libc::DT_CHR => Ok(FileType { mode: libc::S_IFCHR }), |
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libc::DT_FIFO => Ok(FileType { mode: libc::S_IFIFO }), |
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libc::DT_LNK => Ok(FileType { mode: libc::S_IFLNK }), |
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libc::DT_REG => Ok(FileType { mode: libc::S_IFREG }), |
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libc::DT_SOCK => Ok(FileType { mode: libc::S_IFSOCK }), |
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libc::DT_DIR => Ok(FileType { mode: libc::S_IFDIR }), |
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libc::DT_BLK => Ok(FileType { mode: libc::S_IFBLK }), |
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_ => lstat(&self.path()).map(|m| m.file_type()), |
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} |
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} |
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pub fn ino(&self) -> u64 { |
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self.entry.d_ino as u64 |
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} |
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fn name_bytes(&self) -> &[u8] { |
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unsafe { |
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CStr::from_ptr(self.entry.d_name.as_ptr()).to_bytes() |
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} |
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} |
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} |
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impl OpenOptions { |
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pub fn new() -> OpenOptions { |
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OpenOptions { |
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// generic
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read: false, |
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write: false, |
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append: false, |
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truncate: false, |
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create: false, |
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create_new: false, |
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// system-specific
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custom_flags: 0, |
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mode: 0o666, |
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} |
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} |
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pub fn read(&mut self, read: bool) { self.read = read; } |
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pub fn write(&mut self, write: bool) { self.write = write; } |
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pub fn append(&mut self, append: bool) { self.append = append; } |
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pub fn truncate(&mut self, truncate: bool) { self.truncate = truncate; } |
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pub fn create(&mut self, create: bool) { self.create = create; } |
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pub fn create_new(&mut self, create_new: bool) { self.create_new = create_new; } |
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pub fn custom_flags(&mut self, flags: i32) { self.custom_flags = flags; } |
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pub fn mode(&mut self, mode: u32) { self.mode = mode as mode_t; } |
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fn get_access_mode(&self) -> io::Result<c_int> { |
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match (self.read, self.write, self.append) { |
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(true, false, false) => Ok(libc::O_RDONLY), |
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(false, true, false) => Ok(libc::O_WRONLY), |
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(true, true, false) => Ok(libc::O_RDWR), |
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(false, _, true) => Ok(libc::O_WRONLY | libc::O_APPEND), |
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(true, _, true) => Ok(libc::O_RDWR | libc::O_APPEND), |
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(false, false, false) => Err(Error::from_raw_os_error(libc::EINVAL)), |
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} |
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} |
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fn get_creation_mode(&self) -> io::Result<c_int> { |
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match (self.write, self.append) { |
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(true, false) => {} |
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(false, false) => |
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if self.truncate || self.create || self.create_new { |
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return Err(Error::from_raw_os_error(libc::EINVAL)); |
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}, |
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(_, true) => |
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if self.truncate && !self.create_new { |
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return Err(Error::from_raw_os_error(libc::EINVAL)); |
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}, |
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} |
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Ok(match (self.create, self.truncate, self.create_new) { |
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(false, false, false) => 0, |
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(true, false, false) => libc::O_CREAT, |
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(false, true, false) => libc::O_TRUNC, |
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(true, true, false) => libc::O_CREAT | libc::O_TRUNC, |
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(_, _, true) => libc::O_CREAT | libc::O_EXCL, |
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}) |
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} |
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} |
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impl File { |
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pub fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> { |
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let path = cstr(path)?; |
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File::open_c(&path, opts) |
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} |
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pub fn open_c(path: &CStr, opts: &OpenOptions) -> io::Result<File> { |
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let flags = libc::O_CLOEXEC | |
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opts.get_access_mode()? | |
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opts.get_creation_mode()? | |
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(opts.custom_flags as c_int & !libc::O_ACCMODE); |
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let fd = cvt_r(|| unsafe { |
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open64(path.as_ptr(), flags, opts.mode as c_int) |
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})?; |
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let fd = FileDesc::new(fd); |
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// Currently the standard library supports Linux 2.6.18 which did not
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// have the O_CLOEXEC flag (passed above). If we're running on an older
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// Linux kernel then the flag is just ignored by the OS, so we continue
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// to explicitly ask for a CLOEXEC fd here.
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//
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// The CLOEXEC flag, however, is supported on versions of OSX/BSD/etc
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// that we support, so we only do this on Linux currently.
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if cfg!(target_os = "linux") { |
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fd.set_cloexec()?; |
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} |
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Ok(File(fd)) |
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} |
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pub fn file_attr(&self) -> io::Result<FileAttr> { |
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let mut stat: stat64 = unsafe { mem::zeroed() }; |
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cvt(unsafe { |
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fstat64(self.0.raw(), &mut stat) |
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})?; |
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Ok(FileAttr { stat: stat }) |
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} |
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pub fn fsync(&self) -> io::Result<()> { |
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cvt_r(|| unsafe { libc::fsync(self.0.raw()) })?; |
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Ok(()) |
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} |
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pub fn datasync(&self) -> io::Result<()> { |
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cvt_r(|| unsafe { os_datasync(self.0.raw()) })?; |
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return Ok(()); |
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unsafe fn os_datasync(fd: c_int) -> c_int { libc::fsync(fd) } |
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} |
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pub fn truncate(&self, size: u64) -> io::Result<()> { |
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return cvt_r(|| unsafe { |
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ftruncate64(self.0.raw(), size as off64_t) |
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}).map(|_| ()); |
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} |
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pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> { |
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self.0.read(buf) |
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} |
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pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> { |
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self.0.read_to_end(buf) |
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} |
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pub fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> { |
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self.0.read_at(buf, offset) |
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} |
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pub fn write(&self, buf: &[u8]) -> io::Result<usize> { |
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self.0.write(buf) |
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} |
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pub fn write_at(&self, buf: &[u8], offset: u64) -> io::Result<usize> { |
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self.0.write_at(buf, offset) |
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} |
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pub fn flush(&self) -> io::Result<()> { Ok(()) } |
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pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> { |
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let (whence, pos) = match pos { |
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// Casting to `i64` is fine, too large values will end up as
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// negative which will cause an error in `lseek64`.
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SeekFrom::Start(off) => (libc::SEEK_SET, off as i64), |
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SeekFrom::End(off) => (libc::SEEK_END, off), |
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SeekFrom::Current(off) => (libc::SEEK_CUR, off), |
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}; |
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let n = cvt(unsafe { lseek64(self.0.raw(), pos, whence) })?; |
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Ok(n as u64) |
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} |
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pub fn duplicate(&self) -> io::Result<File> { |
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self.0.duplicate().map(File) |
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} |
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pub fn fd(&self) -> &FileDesc { &self.0 } |
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pub fn into_fd(self) -> FileDesc { self.0 } |
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pub fn set_permissions(&self, perm: FilePermissions) -> io::Result<()> { |
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cvt_r(|| unsafe { libc::fchmod(self.0.raw(), perm.mode) })?; |
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Ok(()) |
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} |
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} |
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impl DirBuilder { |
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pub fn new() -> DirBuilder { |
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DirBuilder { mode: 0o777 } |
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} |
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pub fn mkdir(&self, p: &Path) -> io::Result<()> { |
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let p = cstr(p)?; |
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cvt(unsafe { libc::mkdir(p.as_ptr(), self.mode) })?; |
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Ok(()) |
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} |
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pub fn set_mode(&mut self, mode: u32) { |
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self.mode = mode as mode_t; |
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} |
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} |
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fn cstr(path: &Path) -> io::Result<CString> { |
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Ok(CString::new(path.as_os_str().as_bytes())?) |
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} |
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impl FromInner<c_int> for File { |
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fn from_inner(fd: c_int) -> File { |
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File(FileDesc::new(fd)) |
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} |
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} |
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impl fmt::Debug for File { |
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
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fn get_path(_fd: c_int) -> Option<PathBuf> { |
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// FIXME(#24570): implement this for other Unix platforms
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None |
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} |
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fn get_mode(_fd: c_int) -> Option<(bool, bool)> { |
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// FIXME(#24570): implement this for other Unix platforms
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None |
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} |
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let fd = self.0.raw(); |
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let mut b = f.debug_struct("File"); |
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b.field("fd", &fd); |
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if let Some(path) = get_path(fd) { |
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b.field("path", &path); |
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} |
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if let Some((read, write)) = get_mode(fd) { |
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b.field("read", &read).field("write", &write); |
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} |
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b.finish() |
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} |
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} |
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pub fn readdir(p: &Path) -> io::Result<ReadDir> { |
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let root = Arc::new(p.to_path_buf()); |
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let p = cstr(p)?; |
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unsafe { |
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let ptr = libc::opendir(p.as_ptr()); |
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if ptr.is_null() { |
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Err(Error::last_os_error()) |
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} else { |
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Ok(ReadDir { dirp: Dir(ptr), root: root }) |
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} |
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} |
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} |
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pub fn unlink(p: &Path) -> io::Result<()> { |
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let p = cstr(p)?; |
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cvt(unsafe { libc::unlink(p.as_ptr()) })?; |
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Ok(()) |
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} |
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pub fn rename(old: &Path, new: &Path) -> io::Result<()> { |
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let old = cstr(old)?; |
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let new = cstr(new)?; |
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cvt(unsafe { libc::rename(old.as_ptr(), new.as_ptr()) })?; |
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Ok(()) |
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} |
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pub fn set_perm(p: &Path, perm: FilePermissions) -> io::Result<()> { |
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let p = cstr(p)?; |
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cvt_r(|| unsafe { libc::chmod(p.as_ptr(), perm.mode) })?; |
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Ok(()) |
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} |
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pub fn rmdir(p: &Path) -> io::Result<()> { |
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let p = cstr(p)?; |
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cvt(unsafe { libc::rmdir(p.as_ptr()) })?; |
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Ok(()) |
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} |
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pub fn remove_dir_all(path: &Path) -> io::Result<()> { |
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let filetype = lstat(path)?.file_type(); |
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if filetype.is_symlink() { |
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unlink(path) |
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} else { |
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remove_dir_all_recursive(path) |
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} |
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} |
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|
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fn remove_dir_all_recursive(path: &Path) -> io::Result<()> { |
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for child in readdir(path)? { |
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let child = child?; |
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if child.file_type()?.is_dir() { |
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remove_dir_all_recursive(&child.path())?; |
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} else { |
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unlink(&child.path())?; |
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} |
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} |
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rmdir(path) |
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} |
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|
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pub fn readlink(p: &Path) -> io::Result<PathBuf> { |
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let c_path = cstr(p)?; |
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let p = c_path.as_ptr(); |
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let mut buf = Vec::with_capacity(256); |
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|
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loop { |
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let buf_read = cvt(unsafe { |
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libc::readlink(p, buf.as_mut_ptr() as *mut _, buf.capacity()) |
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})? as usize; |
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|
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unsafe { buf.set_len(buf_read); } |
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|
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if buf_read != buf.capacity() { |
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buf.shrink_to_fit(); |
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|
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return Ok(PathBuf::from(OsString::from_vec(buf))); |
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} |
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|
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// Trigger the internal buffer resizing logic of `Vec` by requiring
|
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// more space than the current capacity. The length is guaranteed to be
|
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// the same as the capacity due to the if statement above.
|
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buf.reserve(1); |
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} |
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} |
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|
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pub fn symlink(src: &Path, dst: &Path) -> io::Result<()> { |
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let src = cstr(src)?; |
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let dst = cstr(dst)?; |
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cvt(unsafe { libc::symlink(src.as_ptr(), dst.as_ptr()) })?; |
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Ok(()) |
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} |
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|
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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)?; |
||||
let mut stat: stat64 = unsafe { mem::zeroed() }; |
||||
cvt(unsafe { |
||||
stat64(p.as_ptr(), &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(), &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(), 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))) |
||||
} |
||||
|
||||
pub fn copy(from: &Path, to: &Path) -> io::Result<u64> { |
||||
use fs::{File, set_permissions}; |
||||
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)?; |
||||
set_permissions(to, perm)?; |
||||
Ok(ret) |
||||
} |
||||
Loading…
Reference in new issue