Rollup merge of rust-lang#119026 - devnexen:listener_upd, r=Mark-Simu…

…lacrum

std::net::bind using -1 for openbsd which in turn sets it to somaxconn.

trusting platform's SOMAXCONN instead of hardcoding to 128 otherwise.

library/std/src/os/unix/net/listener.rs

@@ -73,8 +73,18 @@ impl UnixListener {
         unsafe {
             let inner = Socket::new_raw(libc::AF_UNIX, libc::SOCK_STREAM)?;
             let (addr, len) = sockaddr_un(path.as_ref())?;
-            const backlog: libc::c_int =
-                if cfg!(any(target_os = "linux", target_os = "freebsd")) { -1 } else { 128 };
+            #[cfg(any(target_os = "windows", target_os = "redox"))]
+            const backlog: libc::c_int = 128;
+            #[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "openbsd"))]
+            const backlog: libc::c_int = -1;
+            #[cfg(not(any(
+                target_os = "windows",
+                target_os = "redox",
+                target_os = "linux",
+                target_os = "freebsd",
+                target_os = "openbsd"
+            )))]
+            const backlog: libc::c_int = libc::SOMAXCONN;
 
             cvt(libc::bind(inner.as_inner().as_raw_fd(), &addr as *const _ as *const _, len as _))?;
             cvt(libc::listen(inner.as_inner().as_raw_fd(), backlog))?;