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Problems with START_PROCESS@
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dpannhorst



Joined: 29 Aug 2005
Posts: 156
Location: Berlin, Germany

PostPosted: Thu Mar 30, 2017 3:19 pm    Post subject: Problems with START_PROCESS@ Reply with quote

When migrating from FTN95 7.xx to FTN95 8.xx (32bit), I get problems with the call of START_PROCESS@. The return code is now -1, which means a problem with calling the new process.

How can I get more information about the reason of this problem?
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PaulLaidler
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Joined: 21 Feb 2005
Posts: 4919
Location: Salford, UK

PostPosted: Thu Mar 30, 2017 3:54 pm    Post subject: Reply with quote

START_PROCESS@ returns -1 when

a) the length of the command string is zero (i.e. only spaces in Fortran)

b) the resulting call to the API CreateProcess returns NULL.

Case (b) is far more likely but that's as far as I can go.

I have wondered what happens if you try to start up a 32 bit app from a 64 bit app.
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dpannhorst



Joined: 29 Aug 2005
Posts: 156
Location: Berlin, Germany

PostPosted: Thu Mar 30, 2017 4:08 pm    Post subject: Reply with quote

I try to start up a 32 bit app from a 32 bit app.

When I reduce my project to a small example it is working, but in the complete project I get this problem. I can't see any relevant message when compiling and linking the app.
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LitusSaxonicum



Joined: 23 Aug 2005
Posts: 1652
Location: Yateley, Hants, UK

PostPosted: Thu Mar 30, 2017 4:20 pm    Post subject: Reply with quote

In answer to Paul's speculation, I'd expect it to just work, same as calling a 64 bit app from a 32 bit one on a 64 bit system. The question is, what return message do you get when calling a 64 bit app from a 32 bit one on a 32 bit system?

My money is on START_PPROCESS@ at best resorting to a Windows message, and START_PROCESS@ causing a mess/crash/hang. Or maybe both cause a mess etc. Or maybe pigs do fly.

Only experimentation will tell.

Eddie
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BILLDOWS



Joined: 22 Jul 2005
Posts: 83
Location: Swansea, UK

PostPosted: Thu Mar 30, 2017 4:56 pm    Post subject: Reply with quote

Hi, Have you tried:

START_PROCESS_AND_WAIT@

This solved a recent problem I was having with START_PROCESS - might not help but might be worth a try.

Bill
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PaulLaidler
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Joined: 21 Feb 2005
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PostPosted: Thu Mar 30, 2017 9:39 pm    Post subject: Reply with quote

Another one is START_PPROCESS@ (P is repeated).
They probably all end up calling CreateProcess.

If the problem persists then I could look into recovering the API error report following the call to CreateProcess. Thinking about it, you might even be able to get this report directly in your Fortran code.
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dpannhorst



Joined: 29 Aug 2005
Posts: 156
Location: Berlin, Germany

PostPosted: Fri Mar 31, 2017 7:57 am    Post subject: Reply with quote

START_PROCESS_AND_WAIT@ returns also error code -1.

START_PPROCESS@ leads to a "Floating point stack overflow" in __clearwin when executing the line with SDBG.
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dpannhorst



Joined: 29 Aug 2005
Posts: 156
Location: Berlin, Germany

PostPosted: Fri Mar 31, 2017 8:04 am    Post subject: Reply with quote

I called now GetLastError() immediate after START_PROCESS@ and got error code 740, which means: "The requested operation requires elevation."

I don't know the meaning of this error code?
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PaulLaidler
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Joined: 21 Feb 2005
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PostPosted: Fri Mar 31, 2017 9:16 am    Post subject: Reply with quote

Google does.
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mecej4



Joined: 31 Oct 2006
Posts: 732

PostPosted: Fri Mar 31, 2017 10:00 am    Post subject: Reply with quote

The message simply states that your code is attempting to do something such as changing an item in the Windows registry, etc., that requires "elevated privilege". When you attempt such actions in Windows Explorer, you get a pop-up that you have to accept with a click or by entering an Admin password.

No, it does not require you to take your laptop into the Kehlsteinhaus :) .


Last edited by mecej4 on Sat Apr 01, 2017 3:21 am; edited 1 time in total
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LitusSaxonicum



Joined: 23 Aug 2005
Posts: 1652
Location: Yateley, Hants, UK

PostPosted: Fri Mar 31, 2017 11:09 am    Post subject: Reply with quote

Mecej4,

According to Godwin's Law, even with such an oblique reference, your last post has to be declared unhelpful! ;-)

Eddie
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PaulLaidler
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Joined: 21 Feb 2005
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Location: Salford, UK

PostPosted: Fri Mar 31, 2017 3:18 pm    Post subject: Reply with quote

If the application is just for your own use then you can probably fix this by running the primary application under "Run as administrator".
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dpannhorst



Joined: 29 Aug 2005
Posts: 156
Location: Berlin, Germany

PostPosted: Fri Mar 31, 2017 3:47 pm    Post subject: Reply with quote

Obviously when starting the second app with START_PROCESS@ Windows will give a User Account Control message.

This message does not appear when I start the second app directly and it does not appear when I compile with FTN95 7.xx.

I have also another app compiled with FTN95 8.10 which uses the same algorithms and the same second app and there is no such message. START_PROCESS@ works properly in this case.
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PaulLaidler
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Joined: 21 Feb 2005
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PostPosted: Fri Mar 31, 2017 5:12 pm    Post subject: Reply with quote

Are you testing on more than one machine with different operating systems?
If you are only using one machine then the behaviour is very strange.
Can you construct a working sample for me to look at?
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dpannhorst



Joined: 29 Aug 2005
Posts: 156
Location: Berlin, Germany

PostPosted: Sun Apr 02, 2017 9:11 am    Post subject: Reply with quote

I'm just testing on one machine running Windows 10 Pro 64-bit.

I will try to build an example, but it will need some time.
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