From da0d506ace5dc5ec36cd1eafa37a0657fa61442e Mon Sep 17 00:00:00 2001
From: Tomoaki Kawada <kawada@kmckk.co.jp>
Date: Fri, 28 Jan 2022 14:53:54 +0900
Subject: [PATCH] kmc-solid: Implement `FileDesc::duplicate`

---
 library/std/src/sys/solid/abi/sockets.rs | 3 +++
 library/std/src/sys/solid/net.rs         | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/library/std/src/sys/solid/abi/sockets.rs b/library/std/src/sys/solid/abi/sockets.rs
index 7c21d0dd25e03..eb06a6dd927e6 100644
--- a/library/std/src/sys/solid/abi/sockets.rs
+++ b/library/std/src/sys/solid/abi/sockets.rs
@@ -175,6 +175,9 @@ extern "C" {
     #[link_name = "SOLID_NET_Close"]
     pub fn close(s: c_int) -> c_int;
 
+    #[link_name = "SOLID_NET_Dup"]
+    pub fn dup(s: c_int) -> c_int;
+
     #[link_name = "SOLID_NET_GetPeerName"]
     pub fn getpeername(s: c_int, name: *mut sockaddr, namelen: *mut socklen_t) -> c_int;
 
diff --git a/library/std/src/sys/solid/net.rs b/library/std/src/sys/solid/net.rs
index 63ba6341c796c..c91ecce4d728b 100644
--- a/library/std/src/sys/solid/net.rs
+++ b/library/std/src/sys/solid/net.rs
@@ -107,7 +107,7 @@ impl FileDesc {
     }
 
     fn duplicate(&self) -> io::Result<FileDesc> {
-        super::unsupported()
+        cvt(unsafe { netc::dup(self.fd) }).map(Self::new)
     }
 }