Experimental Physics and
Industrial Control System

[email protected] (Ralph Lange) · Mon, 23 Jun 1997 12:25:43 +0200 (METDST)

Another NFS@vxWorks question:

	Our (Unix) NFS server exports two disks: / and /mnt/s5
	There is a soft link in / that points to the other disk:

> ls -al /usr
   1 lrwxrwxrwx   1 root     sys             7 Dec 30 12:27 usr -> /mnt/s5/

	Our IOCs mount the server's disks using nfsMountAll():

-> nfsDevShow
device name          file system                                       
-----------          -----------                                       
/                    vwhost:/                                          
/mnt/s5              vwhost:/mnt/s5                                    

	I create a directory that is writeable for the IOC

drwxrwxr-x   2 lange    epics        1024 Jun 23 11:50 /usr/IOC/Local/test

	When the IOC tries to open a file using the link it gets an error

-> dbior > /usr/IOC/Local/test/test_a
can't create output '/usr/IOC/Local/test/test_a'
  errno = 0xd (S_errno_EACCES)

	whereas it succeeds using the "real" directory name

-> dbior > /mnt/s5/IOC/Local/test/test_a
value = 0 = 0x0

> ls -al /usr/IOC/Local/test 
total 3
drwxrwxr-x   2 lange    epics        1024 Jun 23 11:56 ./
drwxr-x---   6 lange    epics        1024 Jun 23 11:31 ../
-rw-r-----   1 epics    epics          69 Jun 23 11:56 test_a

	or using remsh access

> ls -al /usr/IOC/Local/test    
total 3
drwxrwxr-x   2 lange    epics        1024 Jun 23 11:58 ./
drwxr-x---   6 lange    epics        1024 Jun 23 11:31 ../
-rw-rw-rw-   1 epics    epics          69 Jun 23 11:58 test_a

	Has anyone any explanation for this? (I suppose this is a bug in
the vxWorks nfsLib...)

	Ralph
-- 
      __  Ralph Lange                         Email:       [email protected] 
     /\ \                                     WWW: http://www.bessy.de/~lange
    /  \ \  BESSY II                          
   / /\ \ \  Berliner Elektronenspeicherring- Snail:                 BESSY II
  / / /\ \ \  Gesellschaft fuer Synchrotron-               Rudower Chaussee 5
 / / /__\_\ \  strahlung m.b.H.                       D-12489 Berlin, Germany
/ / /________\                                Phone:         +49 30 6392-4862
\/___________/ Control System Group           Fax:                ...   -4859

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System