From 1ccb50eaa670f86b69e7a64484a8c97e13169183 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Wed, 1 Nov 2017 12:50:13 -0700
Subject: [PATCH] std: Change how EBADF is handled in `sys`

This commit removes the reexport of `EBADF_ERR` as a constant from
libstd's portability facade, instead opting for a platform-specific
function that specifically queries an `io::Error`. Not all platforms may
have a constant for this, so it makes the intent a little more clear
that a code need not be supplied, just an answer to a query.
---
 src/libstd/io/stdio.rs          | 4 +---
 src/libstd/sys/redox/stdio.rs   | 5 ++++-
 src/libstd/sys/unix/stdio.rs    | 5 ++++-
 src/libstd/sys/windows/stdio.rs | 5 ++++-
 4 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/src/libstd/io/stdio.rs b/src/libstd/io/stdio.rs
index fb489bf487b8b..831688bb73d1c 100644
--- a/src/libstd/io/stdio.rs
+++ b/src/libstd/io/stdio.rs
@@ -121,10 +121,8 @@ impl<R: io::Read> io::Read for Maybe<R> {
 }
 
 fn handle_ebadf<T>(r: io::Result<T>, default: T) -> io::Result<T> {
-    use sys::stdio::EBADF_ERR;
-
     match r {
-        Err(ref e) if e.raw_os_error() == Some(EBADF_ERR) => Ok(default),
+        Err(ref e) if stdio::is_ebadf(e) => Ok(default),
         r => r
     }
 }
diff --git a/src/libstd/sys/redox/stdio.rs b/src/libstd/sys/redox/stdio.rs
index c839531cc26c6..3abb094ac34e3 100644
--- a/src/libstd/sys/redox/stdio.rs
+++ b/src/libstd/sys/redox/stdio.rs
@@ -70,5 +70,8 @@ impl io::Write for Stderr {
     }
 }
 
-pub const EBADF_ERR: i32 = ::sys::syscall::EBADF;
+pub fn is_ebadf(err: &io::Error) -> bool {
+    err.raw_os_error() == Some(::sys::syscall::EBADF as i32)
+}
+
 pub const STDIN_BUF_SIZE: usize = ::sys_common::io::DEFAULT_BUF_SIZE;
diff --git a/src/libstd/sys/unix/stdio.rs b/src/libstd/sys/unix/stdio.rs
index 7a8fe25d98ee1..e9b3d4affc7dd 100644
--- a/src/libstd/sys/unix/stdio.rs
+++ b/src/libstd/sys/unix/stdio.rs
@@ -70,5 +70,8 @@ impl io::Write for Stderr {
     }
 }
 
-pub const EBADF_ERR: i32 = ::libc::EBADF as i32;
+pub fn is_ebadf(err: &io::Error) -> bool {
+    err.raw_os_error() == Some(libc::EBADF as i32)
+}
+
 pub const STDIN_BUF_SIZE: usize = ::sys_common::io::DEFAULT_BUF_SIZE;
diff --git a/src/libstd/sys/windows/stdio.rs b/src/libstd/sys/windows/stdio.rs
index b5e5b5760f21b..b43df20bddd08 100644
--- a/src/libstd/sys/windows/stdio.rs
+++ b/src/libstd/sys/windows/stdio.rs
@@ -218,7 +218,10 @@ fn readconsole_input_control(wakeup_mask: c::ULONG) -> c::CONSOLE_READCONSOLE_CO
 const CTRL_Z: u8 = 0x1A;
 const CTRL_Z_MASK: c::ULONG = 0x4000000; //1 << 0x1A
 
-pub const EBADF_ERR: i32 = ::sys::c::ERROR_INVALID_HANDLE as i32;
+pub fn is_ebadf(err: &io::Error) -> bool {
+    err.raw_os_error() == Some(c::ERROR_INVALID_HANDLE as i32)
+}
+
 // The default buffer capacity is 64k, but apparently windows
 // doesn't like 64k reads on stdin. See #13304 for details, but the
 // idea is that on windows we use a slightly smaller buffer that's