Fix MSG_CMSG_CLOEXEC for macos

Author: LinkTed

library/std/src/sys/unix/net.rs

@@ -237,6 +237,15 @@ impl Socket {
         self.recv_from_with_flags(buf, 0)
     }
 
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
     pub fn recv_msg(&self, msg: &mut libc::msghdr) -> io::Result<usize> {
         let n = cvt(unsafe { libc::recvmsg(self.0.raw(), msg, libc::MSG_CMSG_CLOEXEC) })?;
         Ok(n as usize)
@@ -259,6 +268,15 @@ impl Socket {
         self.0.is_write_vectored()
     }
 
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "emscripten",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd",
+    ))]
     pub fn send_msg(&self, msg: &mut libc::msghdr) -> io::Result<usize> {
         let n = cvt(unsafe { libc::sendmsg(self.0.raw(), msg, 0) })?;
         Ok(n as usize)