https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=877f0d13f0f6c6cc8b7988951edac73709d82861

commit 877f0d13f0f6c6cc8b7988951edac73709d82861
Author: Corinna Vinschen <[email protected]>
Date:   Tue Jan 19 10:50:36 2021 +0100

    Cygwin: rmdir: handle /dev in fhandler_dev::rmdir
    
    The isdev_dev check in rmdir is unclean.  Create a virtual method
    fhandler_dev::rmdir to handle this transparently.
    
    Signed-off-by: Corinna Vinschen <[email protected]>

Diff:
---
 winsup/cygwin/dir.cc          | 2 --
 winsup/cygwin/fhandler.h      | 1 +
 winsup/cygwin/fhandler_dev.cc | 7 +++++++
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/dir.cc b/winsup/cygwin/dir.cc
index f912a9e47..7762557d6 100644
--- a/winsup/cygwin/dir.cc
+++ b/winsup/cygwin/dir.cc
@@ -410,8 +410,6 @@ rmdir (const char *dir)
        set_errno (ENOENT);
       else if (has_dot_last_component (dir, false))
        set_errno (EINVAL);
-      else if (isdev_dev (fh->dev ()))
-       set_errno (ENOTEMPTY);
       else if (!fh->rmdir ())
        res = 0;
       delete fh;
diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index e1829e28f..af1ef3a45 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -1765,6 +1765,7 @@ public:
   int close ();
   int __reg2 fstat (struct stat *buf);
   int __reg2 fstatvfs (struct statvfs *buf);
+  int rmdir ();
   DIR __reg2 *opendir (int fd);
   int __reg3 readdir (DIR *, dirent *);
   void rewinddir (DIR *);
diff --git a/winsup/cygwin/fhandler_dev.cc b/winsup/cygwin/fhandler_dev.cc
index 28b0e3cf0..5fd75a58e 100644
--- a/winsup/cygwin/fhandler_dev.cc
+++ b/winsup/cygwin/fhandler_dev.cc
@@ -107,6 +107,13 @@ fhandler_dev::fstatvfs (struct statvfs *sfs)
   return ret;
 }
 
+int
+fhandler_dev::rmdir ()
+{
+  set_errno (ENOTEMPTY);
+  return -1;
+}
+
 DIR *
 fhandler_dev::opendir (int fd)
 {

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