569 lines
18 KiB
Rust
569 lines
18 KiB
Rust
// 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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//! Blocking posix-based file I/O
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use alloc::arc::Arc;
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use libc::{c_int, c_void};
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use libc;
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use std::c_str::CString;
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use std::mem;
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use std::rt::rtio;
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use std::rt::rtio::IoResult;
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use io::{retry, keep_going};
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use io::util;
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pub type fd_t = libc::c_int;
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struct Inner {
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fd: fd_t,
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close_on_drop: bool,
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}
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pub struct FileDesc {
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inner: Arc<Inner>
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}
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impl FileDesc {
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/// Create a `FileDesc` from an open C file descriptor.
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///
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/// The `FileDesc` will take ownership of the specified file descriptor and
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/// close it upon destruction if the `close_on_drop` flag is true, otherwise
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/// it will not close the file descriptor when this `FileDesc` is dropped.
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///
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/// Note that all I/O operations done on this object will be *blocking*, but
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/// they do not require the runtime to be active.
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pub fn new(fd: fd_t, close_on_drop: bool) -> FileDesc {
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FileDesc { inner: Arc::new(Inner {
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fd: fd,
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close_on_drop: close_on_drop
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}) }
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}
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// FIXME(#10465) these functions should not be public, but anything in
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// native::io wanting to use them is forced to have all the
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// rtio traits in scope
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pub fn inner_read(&mut self, buf: &mut [u8]) -> IoResult<uint> {
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let ret = retry(|| unsafe {
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libc::read(self.fd(),
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buf.as_mut_ptr() as *mut libc::c_void,
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buf.len() as libc::size_t) as libc::c_int
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});
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if ret == 0 {
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Err(util::eof())
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} else if ret < 0 {
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Err(super::last_error())
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} else {
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Ok(ret as uint)
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}
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}
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pub fn inner_write(&mut self, buf: &[u8]) -> IoResult<()> {
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let ret = keep_going(buf, |buf, len| {
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unsafe {
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libc::write(self.fd(), buf as *libc::c_void,
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len as libc::size_t) as i64
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}
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});
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if ret < 0 {
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Err(super::last_error())
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} else {
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Ok(())
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}
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}
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pub fn fd(&self) -> fd_t { self.inner.fd }
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}
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impl rtio::RtioFileStream for FileDesc {
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fn read(&mut self, buf: &mut [u8]) -> IoResult<int> {
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self.inner_read(buf).map(|i| i as int)
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}
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fn write(&mut self, buf: &[u8]) -> IoResult<()> {
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self.inner_write(buf)
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}
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fn pread(&mut self, buf: &mut [u8], offset: u64) -> IoResult<int> {
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match retry(|| unsafe {
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libc::pread(self.fd(), buf.as_ptr() as *libc::c_void,
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buf.len() as libc::size_t,
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offset as libc::off_t) as libc::c_int
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}) {
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-1 => Err(super::last_error()),
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n => Ok(n as int)
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}
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}
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fn pwrite(&mut self, buf: &[u8], offset: u64) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe {
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libc::pwrite(self.fd(), buf.as_ptr() as *libc::c_void,
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buf.len() as libc::size_t, offset as libc::off_t)
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} as c_int))
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}
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fn seek(&mut self, pos: i64, whence: rtio::SeekStyle) -> IoResult<u64> {
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let whence = match whence {
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rtio::SeekSet => libc::SEEK_SET,
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rtio::SeekEnd => libc::SEEK_END,
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rtio::SeekCur => libc::SEEK_CUR,
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};
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let n = unsafe { libc::lseek(self.fd(), pos as libc::off_t, whence) };
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if n < 0 {
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Err(super::last_error())
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} else {
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Ok(n as u64)
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}
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}
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fn tell(&self) -> IoResult<u64> {
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let n = unsafe { libc::lseek(self.fd(), 0, libc::SEEK_CUR) };
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if n < 0 {
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Err(super::last_error())
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} else {
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Ok(n as u64)
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}
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}
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fn fsync(&mut self) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe { libc::fsync(self.fd()) }))
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}
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fn datasync(&mut self) -> IoResult<()> {
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return super::mkerr_libc(os_datasync(self.fd()));
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#[cfg(target_os = "macos")]
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#[cfg(target_os = "ios")]
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fn os_datasync(fd: c_int) -> c_int {
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unsafe { libc::fcntl(fd, libc::F_FULLFSYNC) }
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}
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#[cfg(target_os = "linux")]
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fn os_datasync(fd: c_int) -> c_int {
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retry(|| unsafe { libc::fdatasync(fd) })
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}
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#[cfg(not(target_os = "macos"), not(target_os = "ios"), not(target_os = "linux"))]
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fn os_datasync(fd: c_int) -> c_int {
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retry(|| unsafe { libc::fsync(fd) })
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}
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}
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fn truncate(&mut self, offset: i64) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe {
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libc::ftruncate(self.fd(), offset as libc::off_t)
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}))
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}
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fn fstat(&mut self) -> IoResult<rtio::FileStat> {
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let mut stat: libc::stat = unsafe { mem::zeroed() };
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match retry(|| unsafe { libc::fstat(self.fd(), &mut stat) }) {
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0 => Ok(mkstat(&stat)),
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_ => Err(super::last_error()),
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}
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}
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}
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impl rtio::RtioPipe for FileDesc {
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fn read(&mut self, buf: &mut [u8]) -> IoResult<uint> {
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self.inner_read(buf)
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}
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fn write(&mut self, buf: &[u8]) -> IoResult<()> {
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self.inner_write(buf)
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}
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fn clone(&self) -> Box<rtio::RtioPipe + Send> {
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box FileDesc { inner: self.inner.clone() } as Box<rtio::RtioPipe + Send>
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}
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// Only supported on named pipes currently. Note that this doesn't have an
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// impact on the std::io primitives, this is never called via
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// std::io::PipeStream. If the functionality is exposed in the future, then
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// these methods will need to be implemented.
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fn close_read(&mut self) -> IoResult<()> {
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Err(super::unimpl())
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}
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fn close_write(&mut self) -> IoResult<()> {
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Err(super::unimpl())
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}
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fn set_timeout(&mut self, _t: Option<u64>) {}
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fn set_read_timeout(&mut self, _t: Option<u64>) {}
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fn set_write_timeout(&mut self, _t: Option<u64>) {}
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}
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impl rtio::RtioTTY for FileDesc {
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fn read(&mut self, buf: &mut [u8]) -> IoResult<uint> {
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self.inner_read(buf)
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}
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fn write(&mut self, buf: &[u8]) -> IoResult<()> {
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self.inner_write(buf)
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}
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fn set_raw(&mut self, _raw: bool) -> IoResult<()> {
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Err(super::unimpl())
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}
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fn get_winsize(&mut self) -> IoResult<(int, int)> {
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Err(super::unimpl())
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}
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fn isatty(&self) -> bool { false }
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}
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impl Drop for Inner {
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fn drop(&mut self) {
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// closing stdio file handles makes no sense, so never do it. Also, note
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// that errors are ignored when closing a file descriptor. The reason
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// for this is that if an error occurs we don't actually know if the
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// file descriptor was closed or not, and if we retried (for something
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// like EINTR), we might close another valid file descriptor (opened
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// after we closed ours.
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if self.close_on_drop && self.fd > libc::STDERR_FILENO {
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let n = unsafe { libc::close(self.fd) };
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if n != 0 {
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println!("error {} when closing file descriptor {}", n,
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self.fd);
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}
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}
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}
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}
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pub struct CFile {
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file: *libc::FILE,
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fd: FileDesc,
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}
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impl CFile {
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/// Create a `CFile` from an open `FILE` pointer.
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///
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/// The `CFile` takes ownership of the `FILE` pointer and will close it upon
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/// destruction.
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pub fn new(file: *libc::FILE) -> CFile {
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CFile {
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file: file,
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fd: FileDesc::new(unsafe { libc::fileno(file) }, false)
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}
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}
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pub fn flush(&mut self) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe { libc::fflush(self.file) }))
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}
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}
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impl rtio::RtioFileStream for CFile {
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fn read(&mut self, buf: &mut [u8]) -> IoResult<int> {
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let ret = keep_going(buf, |buf, len| {
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unsafe {
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libc::fread(buf as *mut libc::c_void, 1, len as libc::size_t,
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self.file) as i64
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}
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});
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if ret == 0 {
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Err(util::eof())
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} else if ret < 0 {
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Err(super::last_error())
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} else {
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Ok(ret as int)
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}
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}
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fn write(&mut self, buf: &[u8]) -> IoResult<()> {
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let ret = keep_going(buf, |buf, len| {
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unsafe {
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libc::fwrite(buf as *libc::c_void, 1, len as libc::size_t,
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self.file) as i64
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}
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});
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if ret < 0 {
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Err(super::last_error())
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} else {
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Ok(())
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}
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}
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fn pread(&mut self, buf: &mut [u8], offset: u64) -> IoResult<int> {
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self.flush().and_then(|()| self.fd.pread(buf, offset))
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}
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fn pwrite(&mut self, buf: &[u8], offset: u64) -> IoResult<()> {
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self.flush().and_then(|()| self.fd.pwrite(buf, offset))
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}
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fn seek(&mut self, pos: i64, style: rtio::SeekStyle) -> IoResult<u64> {
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let whence = match style {
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rtio::SeekSet => libc::SEEK_SET,
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rtio::SeekEnd => libc::SEEK_END,
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rtio::SeekCur => libc::SEEK_CUR,
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};
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let n = unsafe { libc::fseek(self.file, pos as libc::c_long, whence) };
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if n < 0 {
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Err(super::last_error())
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} else {
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Ok(n as u64)
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}
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}
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fn tell(&self) -> IoResult<u64> {
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let ret = unsafe { libc::ftell(self.file) };
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if ret < 0 {
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Err(super::last_error())
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} else {
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Ok(ret as u64)
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}
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}
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fn fsync(&mut self) -> IoResult<()> {
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self.flush().and_then(|()| self.fd.fsync())
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}
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fn datasync(&mut self) -> IoResult<()> {
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self.flush().and_then(|()| self.fd.fsync())
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}
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fn truncate(&mut self, offset: i64) -> IoResult<()> {
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self.flush().and_then(|()| self.fd.truncate(offset))
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}
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fn fstat(&mut self) -> IoResult<rtio::FileStat> {
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self.flush().and_then(|()| self.fd.fstat())
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}
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}
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impl Drop for CFile {
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fn drop(&mut self) {
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unsafe { let _ = libc::fclose(self.file); }
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}
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}
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pub fn open(path: &CString, fm: rtio::FileMode, fa: rtio::FileAccess)
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-> IoResult<FileDesc>
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{
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let flags = match fm {
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rtio::Open => 0,
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rtio::Append => libc::O_APPEND,
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rtio::Truncate => libc::O_TRUNC,
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};
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// Opening with a write permission must silently create the file.
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let (flags, mode) = match fa {
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rtio::Read => (flags | libc::O_RDONLY, 0),
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rtio::Write => (flags | libc::O_WRONLY | libc::O_CREAT,
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libc::S_IRUSR | libc::S_IWUSR),
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rtio::ReadWrite => (flags | libc::O_RDWR | libc::O_CREAT,
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libc::S_IRUSR | libc::S_IWUSR),
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};
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match retry(|| unsafe { libc::open(path.with_ref(|p| p), flags, mode) }) {
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-1 => Err(super::last_error()),
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fd => Ok(FileDesc::new(fd, true)),
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}
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}
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pub fn mkdir(p: &CString, mode: uint) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe {
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libc::mkdir(p.with_ref(|p| p), mode as libc::mode_t)
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}))
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}
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pub fn readdir(p: &CString) -> IoResult<Vec<CString>> {
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use libc::{dirent_t};
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use libc::{opendir, readdir_r, closedir};
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fn prune(root: &CString, dirs: Vec<Path>) -> Vec<CString> {
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let root = unsafe { CString::new(root.with_ref(|p| p), false) };
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let root = Path::new(root);
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dirs.move_iter().filter(|path| {
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path.as_vec() != bytes!(".") && path.as_vec() != bytes!("..")
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}).map(|path| root.join(path).to_c_str()).collect()
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}
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extern {
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fn rust_dirent_t_size() -> libc::c_int;
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fn rust_list_dir_val(ptr: *mut dirent_t) -> *libc::c_char;
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}
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let size = unsafe { rust_dirent_t_size() };
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let mut buf = Vec::<u8>::with_capacity(size as uint);
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let ptr = buf.as_mut_slice().as_mut_ptr() as *mut dirent_t;
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let dir_ptr = p.with_ref(|buf| unsafe { opendir(buf) });
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if dir_ptr as uint != 0 {
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let mut paths = vec!();
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let mut entry_ptr = 0 as *mut dirent_t;
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while unsafe { readdir_r(dir_ptr, ptr, &mut entry_ptr) == 0 } {
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if entry_ptr.is_null() { break }
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let cstr = unsafe {
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CString::new(rust_list_dir_val(entry_ptr), false)
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};
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paths.push(Path::new(cstr));
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}
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assert_eq!(unsafe { closedir(dir_ptr) }, 0);
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Ok(prune(p, paths))
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} else {
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Err(super::last_error())
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}
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}
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pub fn unlink(p: &CString) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe { libc::unlink(p.with_ref(|p| p)) }))
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}
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pub fn rename(old: &CString, new: &CString) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe {
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libc::rename(old.with_ref(|p| p), new.with_ref(|p| p))
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}))
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}
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pub fn chmod(p: &CString, mode: uint) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe {
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libc::chmod(p.with_ref(|p| p), mode as libc::mode_t)
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}))
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}
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pub fn rmdir(p: &CString) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe {
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libc::rmdir(p.with_ref(|p| p))
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}))
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}
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pub fn chown(p: &CString, uid: int, gid: int) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe {
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libc::chown(p.with_ref(|p| p), uid as libc::uid_t,
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gid as libc::gid_t)
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}))
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}
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pub fn readlink(p: &CString) -> IoResult<CString> {
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let p = p.with_ref(|p| p);
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let mut len = unsafe { libc::pathconf(p, libc::_PC_NAME_MAX) };
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if len == -1 {
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len = 1024; // FIXME: read PATH_MAX from C ffi?
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}
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let mut buf: Vec<u8> = Vec::with_capacity(len as uint);
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match retry(|| unsafe {
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libc::readlink(p, buf.as_ptr() as *mut libc::c_char,
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len as libc::size_t) as libc::c_int
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}) {
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-1 => Err(super::last_error()),
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n => {
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assert!(n > 0);
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unsafe { buf.set_len(n as uint); }
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Ok(buf.as_slice().to_c_str())
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}
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}
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}
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pub fn symlink(src: &CString, dst: &CString) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe {
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libc::symlink(src.with_ref(|p| p), dst.with_ref(|p| p))
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}))
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}
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pub fn link(src: &CString, dst: &CString) -> IoResult<()> {
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super::mkerr_libc(retry(|| unsafe {
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libc::link(src.with_ref(|p| p), dst.with_ref(|p| p))
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}))
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}
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fn mkstat(stat: &libc::stat) -> rtio::FileStat {
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// FileStat times are in milliseconds
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fn mktime(secs: u64, nsecs: u64) -> u64 { secs * 1000 + nsecs / 1000000 }
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|
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#[cfg(not(target_os = "linux"), not(target_os = "android"))]
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fn flags(stat: &libc::stat) -> u64 { stat.st_flags as u64 }
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#[cfg(target_os = "linux")] #[cfg(target_os = "android")]
|
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fn flags(_stat: &libc::stat) -> u64 { 0 }
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#[cfg(not(target_os = "linux"), not(target_os = "android"))]
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fn gen(stat: &libc::stat) -> u64 { stat.st_gen as u64 }
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#[cfg(target_os = "linux")] #[cfg(target_os = "android")]
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fn gen(_stat: &libc::stat) -> u64 { 0 }
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|
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rtio::FileStat {
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size: stat.st_size as u64,
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kind: stat.st_mode as u64,
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|
perm: stat.st_mode as u64,
|
|
created: mktime(stat.st_ctime as u64, stat.st_ctime_nsec as u64),
|
|
modified: mktime(stat.st_mtime as u64, stat.st_mtime_nsec as u64),
|
|
accessed: mktime(stat.st_atime as u64, stat.st_atime_nsec as u64),
|
|
device: stat.st_dev as u64,
|
|
inode: stat.st_ino as u64,
|
|
rdev: stat.st_rdev as u64,
|
|
nlink: stat.st_nlink as u64,
|
|
uid: stat.st_uid as u64,
|
|
gid: stat.st_gid as u64,
|
|
blksize: stat.st_blksize as u64,
|
|
blocks: stat.st_blocks as u64,
|
|
flags: flags(stat),
|
|
gen: gen(stat),
|
|
}
|
|
}
|
|
|
|
pub fn stat(p: &CString) -> IoResult<rtio::FileStat> {
|
|
let mut stat: libc::stat = unsafe { mem::zeroed() };
|
|
match retry(|| unsafe { libc::stat(p.with_ref(|p| p), &mut stat) }) {
|
|
0 => Ok(mkstat(&stat)),
|
|
_ => Err(super::last_error()),
|
|
}
|
|
}
|
|
|
|
pub fn lstat(p: &CString) -> IoResult<rtio::FileStat> {
|
|
let mut stat: libc::stat = unsafe { mem::zeroed() };
|
|
match retry(|| unsafe { libc::lstat(p.with_ref(|p| p), &mut stat) }) {
|
|
0 => Ok(mkstat(&stat)),
|
|
_ => Err(super::last_error()),
|
|
}
|
|
}
|
|
|
|
pub fn utime(p: &CString, atime: u64, mtime: u64) -> IoResult<()> {
|
|
let buf = libc::utimbuf {
|
|
actime: (atime / 1000) as libc::time_t,
|
|
modtime: (mtime / 1000) as libc::time_t,
|
|
};
|
|
super::mkerr_libc(retry(|| unsafe {
|
|
libc::utime(p.with_ref(|p| p), &buf)
|
|
}))
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::{CFile, FileDesc};
|
|
use libc;
|
|
use std::os;
|
|
use std::rt::rtio::{RtioFileStream, SeekSet};
|
|
|
|
#[ignore(cfg(target_os = "freebsd"))] // hmm, maybe pipes have a tiny buffer
|
|
#[test]
|
|
fn test_file_desc() {
|
|
// Run this test with some pipes so we don't have to mess around with
|
|
// opening or closing files.
|
|
let os::Pipe { input, out } = os::pipe();
|
|
let mut reader = FileDesc::new(input, true);
|
|
let mut writer = FileDesc::new(out, true);
|
|
|
|
writer.inner_write(bytes!("test")).ok().unwrap();
|
|
let mut buf = [0u8, ..4];
|
|
match reader.inner_read(buf) {
|
|
Ok(4) => {
|
|
assert_eq!(buf[0], 't' as u8);
|
|
assert_eq!(buf[1], 'e' as u8);
|
|
assert_eq!(buf[2], 's' as u8);
|
|
assert_eq!(buf[3], 't' as u8);
|
|
}
|
|
r => fail!("invalid read: {:?}", r)
|
|
}
|
|
|
|
assert!(writer.inner_read(buf).is_err());
|
|
assert!(reader.inner_write(buf).is_err());
|
|
}
|
|
|
|
#[test]
|
|
fn test_cfile() {
|
|
unsafe {
|
|
let f = libc::tmpfile();
|
|
assert!(!f.is_null());
|
|
let mut file = CFile::new(f);
|
|
|
|
file.write(bytes!("test")).ok().unwrap();
|
|
let mut buf = [0u8, ..4];
|
|
let _ = file.seek(0, SeekSet).ok().unwrap();
|
|
match file.read(buf) {
|
|
Ok(4) => {
|
|
assert_eq!(buf[0], 't' as u8);
|
|
assert_eq!(buf[1], 'e' as u8);
|
|
assert_eq!(buf[2], 's' as u8);
|
|
assert_eq!(buf[3], 't' as u8);
|
|
}
|
|
r => fail!("invalid read: {:?}", r)
|
|
}
|
|
}
|
|
}
|
|
}
|