From 5e3a7005ee30113191974e44e4903d054ce48594 Mon Sep 17 00:00:00 2001
From: Miles Bader <miles@gnu.org>
Date: Tue, 24 Sep 1996 20:27:52 +0000
Subject: (check_open_hook):   Return EROFS if O_WRITE on a readonly device.
 (trivfs_S_file_check_access):   New function.

---
 storeio/storeio.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'storeio')

diff --git a/storeio/storeio.c b/storeio/storeio.c
index fcf39bee..63ad0b3d 100644
--- a/storeio/storeio.c
+++ b/storeio/storeio.c
@@ -185,6 +185,9 @@ check_open_hook (struct trivfs_control *trivfs_control,
 {
   error_t err = 0;
 
+  if (!err && readonly && (flags & O_WRITE))
+    return EROFS;
+
   mutex_lock (&device_lock);
   if (device == NULL)
     /* Try and open the device.  */
@@ -202,6 +205,18 @@ check_open_hook (struct trivfs_control *trivfs_control,
   return err;
 }
 
+error_t
+trivfs_S_file_check_access (struct trivfs_protid *cred,
+			    mach_port_t reply, mach_msg_type_name_t reply_type,
+			    int *allowed)
+{
+  if (! cred)
+    return EOPNOTSUPP;
+  else
+    return file_check_access (cred->realnode, allowed);
+  return 0;
+}
+
 static error_t
 open_hook (struct trivfs_peropen *peropen)
 {
-- 
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