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#![unstable(reason = "not public", issue = "0", feature = "fd")]
use crate::io::{self, Read};
use crate::mem;
use crate::sys::{cvt, syscall};
use crate::sys_common::AsInner;
pub struct FileDesc {
fd: usize,
}
impl FileDesc {
pub fn new(fd: usize) -> FileDesc {
FileDesc { fd }
}
pub fn raw(&self) -> usize { self.fd }
/// Extracts the actual file descriptor without closing it.
pub fn into_raw(self) -> usize {
let fd = self.fd;
mem::forget(self);
fd
}
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
cvt(syscall::read(self.fd, buf))
}
pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
let mut me = self;
(&mut me).read_to_end(buf)
}
pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
cvt(syscall::write(self.fd, buf))
}
pub fn duplicate(&self) -> io::Result<FileDesc> {
self.duplicate_path(&[])
}
pub fn duplicate_path(&self, path: &[u8]) -> io::Result<FileDesc> {
let new_fd = cvt(syscall::dup(self.fd, path))?;
Ok(FileDesc::new(new_fd))
}
pub fn nonblocking(&self) -> io::Result<bool> {
let flags = cvt(syscall::fcntl(self.fd, syscall::F_GETFL, 0))?;
Ok(flags & syscall::O_NONBLOCK == syscall::O_NONBLOCK)
}
pub fn set_cloexec(&self) -> io::Result<()> {
let mut flags = cvt(syscall::fcntl(self.fd, syscall::F_GETFD, 0))?;
flags |= syscall::O_CLOEXEC;
cvt(syscall::fcntl(self.fd, syscall::F_SETFD, flags)).and(Ok(()))
}
pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
let mut flags = cvt(syscall::fcntl(self.fd, syscall::F_GETFL, 0))?;
if nonblocking {
flags |= syscall::O_NONBLOCK;
} else {
flags &= !syscall::O_NONBLOCK;
}
cvt(syscall::fcntl(self.fd, syscall::F_SETFL, flags)).and(Ok(()))
}
}
impl<'a> Read for &'a FileDesc {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
(**self).read(buf)
}
}
impl AsInner<usize> for FileDesc {
fn as_inner(&self) -> &usize { &self.fd }
}
impl Drop for FileDesc {
fn drop(&mut self) {
// Note that errors are ignored when closing a file descriptor. The
// reason for this is that if an error occurs we don't actually know if
// the file descriptor was closed or not, and if we retried (for
// something like EINTR), we might close another valid file descriptor
// (opened after we closed ours.
let _ = syscall::close(self.fd);
}
}
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