ad_open.c: check we have the right perm when a file is opened multiple times.

diff --git a/libatalk/adouble/ad_open.c b/libatalk/adouble/ad_open.c
index 43326d1fc2682b56c66ead273a48020514ec9369..990e3a4d7cbde1ad64a7932d89623bff43db51aa 100644 (file)
--- a/libatalk/adouble/ad_open.c
+++ b/libatalk/adouble/ad_open.c
@@ -1,5 +1,5 @@
 /*
- * $Id: ad_open.c,v 1.17 2002-06-17 17:58:37 didg Exp $
+ * $Id: ad_open.c,v 1.18 2002-08-14 10:35:46 didg Exp $
  *
  * Copyright (c) 1999 Adrian Sun (asun@u.washington.edu)
  * Copyright (c) 1990,1991 Regents of The University of Michigan.
@@ -624,6 +624,15 @@ int ad_open( path, adflags, oflags, mode, ad )
          ad->ad_df.adf_off = 0;
          ad->ad_df.adf_flags = hoflags;
        } 
+        else {
+            /* the file is already open... but */
+            if ((oflags & ( O_RDWR | O_WRONLY)) &&             /* we want write access */
+               !(ad->ad_df.adf_flags & ( O_RDWR | O_WRONLY))) /* and it was denied the first time */
+            {
+                 errno == EACCES;
+                 return -1;
+            }
+       }
        ad->ad_df.adf_refcount++;
     }
 
@@ -772,6 +781,17 @@ int ad_open( path, adflags, oflags, mode, ad )
            }
          }
        }
+       else { /* already open */
+            if ((oflags & ( O_RDWR | O_WRONLY)) &&             
+               !(ad->ad_hf.adf_flags & ( O_RDWR | O_WRONLY))) {
+               if (adflags & ADFLAGS_DF) {
+                   /* don't call with ADFLAGS_HF because we didn't open ressource fork */
+                   ad_close( ad, ADFLAGS_DF );
+                }
+                 errno == EACCES;
+                return -1;
+           }
+       }
        ad->ad_hf.adf_refcount++;
     }