Re: list of open descriptors

[Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>]

Hi Chuck

I saw that - it says to use 0 to get the current maximum for the job - 
32K by default.

I didn't see that the function returns what anything like what is in USE 
- that is, how many open files there are.

This is still an interesting function!

Vern

On 6/6/2013 11:08 AM, CRPence wrote:
> On 05 Jun 2013 19:59, Mike Krebs wrote:
> > <<SNIP>>
> >
> > What is the command or API that will show the list of open
> > descriptors or the number of open descriptors in a job?
>     For the latter question, "the number of open descriptors in a job",
> the DosSetRelMaxFH() (Change Maximum Number of File Descriptors) API
> *apparently could be used* [probably not a desirable means] to determine
> that information for any value over twenty; i.e. by requesting to
> decrease the maximum number of file descriptors to twenty... and then
> presumably, to reset the maximum to its original value that was saved on
> a prior invocation to retrieve that maximum.
>
> http://pic.dhe.ibm.com/infocenter/iseries/v7r1m0/topic/apis/dossrmfh.htm
> _i DosSetRelMaxFH()--Change Maximum Number of File Descriptors i_
> "...
> The DosSetRelMaxFH() function requests that the system change the
> maximum number of file descriptors for the calling process (job). The
> system preserves all file descriptors that are currently open.
>
>    ...
>
> A request to decrease the maximum number of file descriptors will
> succeed. The resulting maximum will be the smallest number possible, but
> may be more than what you expected. For example, assume that the current
> maximum is 200 and there are 150 open files. A request to decrease the
> maximum by 75 results in the maximum being decreased by only 50, to 150,
> to preserve the open file descriptors.
>
> A request to decrease the maximum number of file descriptors to below 20
> will succeed, but the maximum will never be decreased below 20.
>
> To retrieve the current maximum number of file descriptors, without any
> side effects, the value pointed to by pcbReqCount should be set to zero.
>    ..."