Auto merge of #43459 - ids1024:asrawfd, r=alexcrichton

Implement AsRawFd for Stdin, Stdout, and Stderr

https://github.com/rust-lang/rfcs/issues/2074

1 files changed, 17 insertions, 0 deletions

diff --git a/src/libstd/sys/unix/ext/io.rs b/src/libstd/sys/unix/ext/io.rs
index 296235e173d..a0323d933d6 100644
--- a/src/libstd/sys/unix/ext/io.rs
+++ b/src/libstd/sys/unix/ext/io.rs
@@ -16,7 +16,9 @@ use fs;
 use net;
 use os::raw;
 use sys;
+use io;
 use sys_common::{self, AsInner, FromInner, IntoInner};
+use libc;
 
 /// Raw file descriptors.
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -104,6 +106,21 @@ impl AsRawFd for net::UdpSocket {
     fn as_raw_fd(&self) -> RawFd { *self.as_inner().socket().as_inner() }
 }
 
+#[stable(feature = "asraw_stdio", since = "1.21.0")]
+impl AsRawFd for io::Stdin {
+    fn as_raw_fd(&self) -> RawFd { libc::STDIN_FILENO }
+}
+
+#[stable(feature = "asraw_stdio", since = "1.21.0")]
+impl AsRawFd for io::Stdout {
+    fn as_raw_fd(&self) -> RawFd { libc::STDOUT_FILENO }
+}
+
+#[stable(feature = "asraw_stdio", since = "1.21.0")]
+impl AsRawFd for io::Stderr {
+    fn as_raw_fd(&self) -> RawFd { libc::STDERR_FILENO }
+}
+
 #[stable(feature = "from_raw_os", since = "1.1.0")]
 impl FromRawFd for net::TcpStream {
     unsafe fn from_raw_fd(fd: RawFd) -> net::TcpStream {