[dtrace-discuss] Convert fd into string

[Angelo Rajadurai]

Not sure what you mean by FD as a string. If you are trying to print  
the name of the file from the FD them you can use the fds[] array.

Something like

syscall::read:entry
    /pid == $1 /
    {
        printf("Reading (%s) \n", fds[arg0].fi_pathname);

    }

-Angelo

On Aug 18, 2009, at 4:27 PM, Venkateshu.Cherukupalli at ubs.com wrote:

>
> Hi,
>
> I am trying to convert and print fd from read/write calls into string
> and it fails with below error.
>
> dtrace: error on enabled probe ID 1 (ID 23: syscall::read:entry):
> invalid address (0x0) in action #1
>
> What am I missing ?
>
>    syscall::read:entry
>    /pid == $1 /
>    {
>        printf("Reading FD (%s) \n", (string)arg0);
>
>    }
>
> Printing fd as integer (%d) works ok.
>
> Cheers,
> Venkat
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