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  3. June 2006

Re: STRDBG/ENDDBG required to prevent Java open exception

Hi Scott,

This is turning into a Unix lesson for me - hope you don't mind<G>.

  Peter Dow wrote:

Do Unix programs typically expect their caller to have already opened
the std io files?

Scott Klement wrote:
They're typically opened by the shell (the command-line environment) before any programs are invoked. Then, the descriptors are inherited each time a new process is created. So, normally the only time a Unix program would open them is to override the default behavior. 
Obviously this is not the behavior with QCMD.  What about with QSH or PASE?

Btw, you mentioned in another thread that PASE is an emulation environment:
"PASE isn't native (IMHO). PASE is an emulation environment that allows you to run stuff compiled for AIX. You could argue that it's native because it uses the same hardware as the System p, but to me that's a stretch. PASE isn't native."
I was doing some reading and according to IBM (http://www-03.ibm.com/servers/enable/site/porting/iseries/pase/overview.html):
"pSeries and iSeries share a common PowerPC chip. This hardware base has the ability to switch between runtime modes: addressing tags active to execute 64 bit OS/400 applications; addressing tags inactive to execute 64- or 32-bit AIX applications. PASE exploits this switching capability to execute AIX applications on iSeries within OS/400 jobs. Since PASE applications execute directly on the hardware in PowerPC mode, computationally intensive applications use the processor without any additional layers overhead."
So it should be executing faster than an emulator. Don't know if that changes your mind about it being native or not, but just thought I'd mention it because until I read that, I thought it was an emulator myself. 

*Peter Dow* /
Dow Software Services, Inc.
909 793-9050
pdow@xxxxxxxxxxxxxxx <mailto:pdow@xxxxxxxxxxxxxxx> /

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