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#![unstable(reason = "not public", issue = "0", feature = "fd")]
use prelude::v1::*;
use io::{self, Read};
use libc::{self, c_int, size_t, c_void};
use mem;
use sync::atomic::{AtomicBool, Ordering};
use sys::cvt;
use sys_common::AsInner;
use sys_common::io::read_to_end_uninitialized;
pub struct FileDesc {
fd: c_int,
}
impl FileDesc {
pub fn new(fd: c_int) -> FileDesc {
FileDesc { fd: fd }
}
pub fn raw(&self) -> c_int { self.fd }
pub fn into_raw(self) -> c_int {
let fd = self.fd;
mem::forget(self);
fd
}
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
let ret = cvt(unsafe {
libc::read(self.fd,
buf.as_mut_ptr() as *mut c_void,
buf.len() as size_t)
})?;
Ok(ret as usize)
}
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> {
let ret = cvt(unsafe {
libc::write(self.fd,
buf.as_ptr() as *const c_void,
buf.len() as size_t)
})?;
Ok(ret as usize)
}
#[cfg(not(any(target_env = "newlib", target_os = "solaris", target_os = "emscripten")))]
pub fn set_cloexec(&self) {
unsafe {
let ret = libc::ioctl(self.fd, libc::FIOCLEX);
debug_assert_eq!(ret, 0);
}
}
#[cfg(any(target_env = "newlib", target_os = "solaris", target_os = "emscripten"))]
pub fn set_cloexec(&self) {
unsafe {
let previous = libc::fcntl(self.fd, libc::F_GETFD);
let ret = libc::fcntl(self.fd, libc::F_SETFD, previous | libc::FD_CLOEXEC);
debug_assert_eq!(ret, 0);
}
}
pub fn set_nonblocking(&self, nonblocking: bool) {
unsafe {
let previous = libc::fcntl(self.fd, libc::F_GETFL);
debug_assert!(previous != -1);
let new = if nonblocking {
previous | libc::O_NONBLOCK
} else {
previous & !libc::O_NONBLOCK
};
let ret = libc::fcntl(self.fd, libc::F_SETFL, new);
debug_assert!(ret != -1);
}
}
pub fn duplicate(&self) -> io::Result<FileDesc> {
#[cfg(target_os = "android")]
use libc::F_DUPFD as F_DUPFD_CLOEXEC;
#[cfg(not(target_os = "android"))]
use libc::F_DUPFD_CLOEXEC;
let make_filedesc = |fd| {
let fd = FileDesc::new(fd);
fd.set_cloexec();
fd
};
static TRY_CLOEXEC: AtomicBool =
AtomicBool::new(!cfg!(target_os = "android"));
let fd = self.raw();
if TRY_CLOEXEC.load(Ordering::Relaxed) {
match cvt(unsafe { libc::fcntl(fd, F_DUPFD_CLOEXEC, 0) }) {
Ok(fd) => {
return Ok(if cfg!(target_os = "linux") {
make_filedesc(fd)
} else {
FileDesc::new(fd)
})
}
Err(ref e) if e.raw_os_error() == Some(libc::EINVAL) => {
TRY_CLOEXEC.store(false, Ordering::Relaxed);
}
Err(e) => return Err(e),
}
}
cvt(unsafe { libc::fcntl(fd, libc::F_DUPFD, 0) }).map(make_filedesc)
}
}
impl<'a> Read for &'a FileDesc {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
(**self).read(buf)
}
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
unsafe { read_to_end_uninitialized(self, buf) }
}
}
impl AsInner<c_int> for FileDesc {
fn as_inner(&self) -> &c_int { &self.fd }
}
impl Drop for FileDesc {
fn drop(&mut self) {
let _ = unsafe { libc::close(self.fd) };
}
}