file I/O from target

Hi,

I'm running an RTP (VxWorks 6.6) on a PPC target. I'm trying to write
out a log file from the target to a host directory. It appears the
file descriptor returned is ok and when I call write() it returns the
correct number of bytes. Unfortunately the file is never created.

I'm not using NFS but just relying on using the server name. The
location is the same as where the boot kernel resides so I know the
target has access to it.


const char* LOG_NAME = "myserver:~myusrid/log.txt";

fd = open(LOG_NAME, O_CREAT | O_WRONLY);

bytes = write(fd, "test", 4);


Any idea why the file never gets created?

Thanks in advance.

May be you need to close your file descriptor?

Note that your booted kernel may have a different view of its
environment from that of the bootloader and may not be able to access
"myserver:~myusrid/log.txt" when the bootloader can.

--
PAD

Rocketman wrote:[color=blue]
> Hi,
>
> I'm running an RTP (VxWorks 6.6) on a PPC target. I'm trying to write
> out a log file from the target to a host directory. It appears the
> file descriptor returned is ok and when I call write() it returns the
> correct number of bytes. Unfortunately the file is never created.
>
> I'm not using NFS but just relying on using the server name. The
> location is the same as where the boot kernel resides so I know the
> target has access to it.
>
>
> const char* LOG_NAME = "myserver:~myusrid/log.txt";
>
> fd = open(LOG_NAME, O_CREAT | O_WRONLY);
>
> bytes = write(fd, "test", 4);
>[/color]

I've never tried using '~' in a path under vxworks. Is your boot kernel
also under ~myuserid?

From the target shell, type 'devs' to check what devices it really
knows about. See if you can cd "~myuserid" and ls. All of these should
work from the target shell.

Cheers,

Iain

Ah, found it.

The target only had read access to the directory. When I changed it
to allow write access everything worked fine.
I'm surprised I didn't get an error returned on the open()

The name "myserver:~myusrid/log.txt" is working.

My understanding is the ~myuserid takes you to that user's home
directory.

Thanks for the replies.