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Mixed up about mixed mode
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 Mixed up about mixed mode - Jun. 14, '06, 9:59:59 AM
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rapid
Posts: 8
Joined: Jun. 1, '06,
Status: offline
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Please can someone direct me to a definition of a "mixed mode" application under SUA.
I've compiled a Hello World program under SUA using c89 with VS 2005.
The c89 man page states that the -R flag creates a mixed mode executable.
/bin/c89 -R hello.c creates a Windows-CUI DOS executable
/bin/c89 hello.c creates a Posix-CUI DOS executable
I thought (maybe wrongly) that a mixed mode application was a Posix executable that can call a function in a Windows DLL.
I want to call some Windows functions from a large program which uses many Posix functions. The program works fine under SFU and SUA. How should I go about this ?
Thanks
Rapid
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RE: Mixed up about mixed mode - Jun. 14, '06, 1:18:46 PM
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Rodney
Posts: 3695
Joined: Jul. 9, '02,
From: /Tools lab
Status: offline
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No, you have it reversed.
Each process can only have one "master" as far as which subsystem has authority over it.
The mixed-mode application is a Win32 binary that makes calls to the Interix subsystem.
There is a special communications layer that has been made for Win32 programs to
connect/request API support from the Interix subsystem.
If you could look under the covers you'd find Win32 is not compartmentalized well.
Maybe way back at NT 2.0 it was. I'm speaking to the Mach-like model NT is built on.
On the other hand, Interix still is. So that we the easiest way to do it based on the
way MS has described it.
The best thing to do is give it a try. See what happens.
The docs warn about using fork() and exec() with mixed-mode processes.
So a "better method" of mixed mode may be better, but it would be harder to do.
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RE: Mixed up about mixed mode - Jun. 17, '06, 2:06:00 AM
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anue
Posts: 2
Joined: Dec. 1, '05,
Status: offline
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let me just add a little more information. It is true that all Binary in Mixed Mode is Windows Binary type. But when you link hello.c under posix mixed mode, that program uses only POSIX function calls. Your printf's go to the C run time that is shipped with Posix. The Only change that you see is that CSRSS ( Windows Subsystem ) thinks that process is its child process.
However unless you call into a DLL ( that is the real purpose of this Mixed Mode) no running threads will enter CSRSS. So your mental model is correct, you can think of Mixed Mode as a posix program trying to call into Windows DLL. However inorder to achieve that abstraction we have to start the life of the process as a Windows Process and hence you see this Windows CUI bit set.
I hope that clarifies the issue.
regards
Anu
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