Formerly file-chmod.c.~2~

1 files changed, 45 insertions, 0 deletions

diff --git a/libdiskfs/file-chmod.c b/libdiskfs/file-chmod.c
new file mode 100644
index 00000000..cdb6b1c7
--- /dev/null
+++ b/libdiskfs/file-chmod.c
@@ -0,0 +1,45 @@
+/* libdiskfs implementation of fs.defs: file_chmod
+   Copyright (C) 1992, 1993, 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+/* Implement file_chmod as described in <hurd/fs.defs>. */
+error_t
+diskfs_S_file_chmod (struct protid *cred,
+	      mode_t mode)
+{
+  mode &= ~(S_IFMT | S_ISPARE);
+  
+  CHANGE_NODE_FIELD (cred,
+		   ({
+		     if (!(err = isowner (np, cred)))
+		       {
+			 if (!isuid (0, cred))
+			   {
+			     if (S_ISDIR (np->dn_stat.st_mode))
+			       mode &= ~S_ISVTX;
+			     if (!groupmember (np->dn_stat.st_gid, cred))
+			       mode &= ~S_ISGID;
+			     if (!isuid (np->dn_stat.st_uid, cred))
+			       mode &= ~S_ISUID;
+			   }
+			 mode |= ((np->dn_stat.st_mode & (S_IFMT | S_ISPARE)));
+			 np->dn_stat.st_mode = mode;
+			 np->dn_set_ctime = 1;
+		       }
+		   }));
+}