Experimental Physics and
Industrial Control System

[email protected] (Ralph Lange) · Mon, 21 Jul 1997 15:01:22 +0200 (METDST)

> Another NFS@vxWorks question:
> 
> [... long blurp about NFS problems - write access through links ...]
> 
> 	Has anyone any explanation for this? (I suppose this is a bug in
> the vxWorks nfsLib...)

I filed a problem report with WRS customer support Europe and they
answered:

[ Our nfs client has problems with links - this is an old story. I remember
[ the correct setting of the soft link's permission bits being part of it.
[ ... ]
[ But I just stumbled over SPR#6468 , sounds like your  problem . 

----------------------------------------------------------------------------

TITLE: 5.3.FCS-spr6468_nfs-symbolic-link.README

title: Symbolic linked file fails over NFS when opened for write mode.

AUTHOR: Rajesh

                         SCOPE                   DISCOVERED ON
              HOST:  All                        HP 9000/700
                     -------------------     -------------------
      ARCHITECTURE:  All                        68040
                     -------------------     -------------------
               BSP:  All                        mv162
                     -------------------     -------------------
PRODUCT / REVISION:  5.2, 5.3                   Tornado 1.0 FCS
                     -------------------     -------------------

DESCRIPTION OF PROBLEM: fopen() cannot open the file for writing if it
is a symbolic link to another file.
The following error is displayed  -

-> myfd = fopen ("/red1/rajesh/zoo","w")
myfd = 0x3b0f84: value = 0 = 0x0
-> printErrno
0xd = S_errno_EACCES
value = 0 = 0x0

RESEARCH: fopen works fine if the file is accessed over RSH instead of NFS
          or if you are in the same directory in which the symbolic file is
          present.

SPR / PATCH : 6468, Patch in nfsLib.c

FIX : 

<           return (FOLLOW_LINK);
---
>           return (OK);
726c726
<     where.name = fileName;
---
>     where.name = fullFileName;

-----------------------------------------------------------------------------

So this *was* a bug in the nfsLib...

Ralph

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System