[PATCH] Cygwin: fix mknod (64-bit only)

Ken Brown kbrown@cornell.edu
Sun May 22 16:18:37 GMT 2022

Patch attached.  I'll push it in a few days if no one sees anything wrong with it.

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From 54cfc70ff3a548d861cb59ac6b2084cc6b791ec2 Mon Sep 17 00:00:00 2001
From: Ken Brown <kbrown@cornell.edu>
Date: Sun, 22 May 2022 11:43:44 -0400
Subject: [PATCH] Cygwin: fix mknod (64-bit only)

The current definition of mknod in syscalls.cc has a third argument of
type __dev16_t instead of dev_t.  Fix this on 64-bit Cygwin by
exporting mknod as an alias for mknod32.  (There is no problem on
32-bit because mknod is redirected to mknod32 via NEW_FUNCTIONS in

Addresses: https://cygwin.com/pipermail/cygwin-developers/2022-May/012589.html
 winsup/cygwin/release/3.3.6 | 3 +++
 winsup/cygwin/syscalls.cc   | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/winsup/cygwin/release/3.3.6 b/winsup/cygwin/release/3.3.6
index 6d722433f..135f33155 100644
--- a/winsup/cygwin/release/3.3.6
+++ b/winsup/cygwin/release/3.3.6
@@ -7,3 +7,6 @@ Bug Fixes
 - Fix killpg failing because the exec'ing as well as the exec'ed
   process are not in the pidlist for a brief moment.
   Addresses: https://cygwin.com/pipermail/cygwin/2022-May/251479.html
+- Fix mknod (64-bit only), whose definition didn't match its prototype.
+  Addresses: https://cygwin.com/pipermail/cygwin-developers/2022-May/012589.html
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index 3a652c4f4..344d1d329 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -3490,11 +3490,15 @@ mknod32 (const char *path, mode_t mode, dev_t dev)
   return -1;
+#ifdef __i386__
 extern "C" int
 mknod (const char *_path, mode_t mode, __dev16_t dev)
   return mknod32 (_path, mode, (dev_t) dev);
+EXPORT_ALIAS (mknod32, mknod)
 extern "C" int
 mkfifo (const char *path, mode_t mode)

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