[PATCH v4] server: Fail if non-empty directory marked for deletion.

[Daniel Lehman]

Signed-off-by: Daniel Lehman 
---
v4: remove unneeded close()
v3: use fdopendir(dup())
v2: use getdents

needed by std::filesystem::remove_all, which removes files with:
- CreateFileW
- SetFileInformationByHandle(FileDispositionInfoEx) // currently unimplemented
- SetFileInformationByHandle(FileDispositionInfo) - DeleteFile = TRUE
- CloseHandle
---
 dlls/ntdll/tests/file.c |  3 ---
 server/fd.c             | 50 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 3 deletions(-)

diff --git a/dlls/ntdll/tests/file.c b/dlls/ntdll/tests/file.c
index 31c18454f0..1d0682a633 100644
--- a/dlls/ntdll/tests/file.c
+++ b/dlls/ntdll/tests/file.c
@@ -3185,17 +3185,14 @@ todo_wine
     CloseHandle( handle2 );
     fdi.DoDeleteFile = TRUE;
     res = pNtSetInformationFile( handle, &io, &fdi, sizeof fdi, FileDispositionInformation );
-    todo_wine
     ok( res == STATUS_DIRECTORY_NOT_EMPTY, "unexpected FileDispositionInformation result (expected STATUS_DIRECTORY_NOT_EMPTY, got %x)\n", res );
     fileDeleted = DeleteFileA( buffer );
     ok( fileDeleted, "File should have been deleted\n" );
     buffer[dirpos] = '\0';
     CloseHandle( handle );
     fileDeleted = GetFileAttributesA( buffer ) == INVALID_FILE_ATTRIBUTES && GetLastError() == ERROR_FILE_NOT_FOUND;
-    todo_wine
     ok( !fileDeleted, "Directory shouldn't have been deleted\n" );
     fileDeleted = RemoveDirectoryA( buffer );
-todo_wine
     ok( fileDeleted, "Directory should have been deleted\n" );
 }

diff --git a/server/fd.c b/server/fd.c
index 06d1d81bdb..8257f3821a 100644
--- a/server/fd.c
+++ b/server/fd.c
@@ -93,6 +93,9 @@
 #ifdef HAVE_SYS_SYSCALL_H
 #include <sys/syscall.h>
 #endif
+#ifdef HAVE_DIRENT_H
+#include <dirent.h>
+#endif

#include "ntstatus.h"
 #define WIN32_NO_STATUS
@@ -2364,6 +2367,35 @@ static struct fd *get_handle_fd_obj( struct process *process, obj_handle_t handl
     return fd;
 }

+static int is_dir_empty( int fd )
+{
+#ifdef HAVE_DIRENT_H
+    DIR *dir;
+    int empty;
+    struct dirent *de;
+
+    if ((fd = dup( fd )) == -1)
+        return -1;
+
+    if (!(dir = fdopendir( fd )))
+    {
+        close( fd );
+        return -1;
+    }
+
+    empty = 1;
+    while (empty && (de = readdir( dir )))
+    {
+        if (!strcmp( de->d_name, "." ) || !strcmp( de->d_name, ".." )) continue;
+        empty = 0;
+    }
+    closedir( dir );
+    return empty;
+#else
+    return 1;
+#endif
+}
+
 /* set disposition for the fd */
 static void set_fd_disposition( struct fd *fd, int unlink )
 {
@@ -2401,6 +2433,24 @@ static void set_fd_disposition( struct fd *fd, int unlink )
         return;
     }

+    /* can't remove non-empty directories */
+    if (unlink && S_ISDIR(st.st_mode))
+    {
+        int empty;
+
+        if ((empty = is_dir_empty( fd->unix_fd )) == -1)
+        {
+            file_set_error();
+            return;
+        }
+
+        if (!empty)
+        {
+            set_error( STATUS_DIRECTORY_NOT_EMPTY );
+            return;
+        }
+    }
+
     fd->closed->unlink = unlink ? 1 : 0;
     if (fd->options & FILE_DELETE_ON_CLOSE)
         fd->closed->unlink = -1;