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From: dillon@CORY.BERKELEY.EDU (Matt Dillon)
Newsgroups: comp.sys.amiga
Subject: Re: Help with CreateProc()
Message-ID: <8711090253.AA25686@cory.Berkeley.EDU>
Date: Sun, 8-Nov-87 21:53:30 EST
Article-I.D.: cory.8711090253.AA25686
Posted: Sun Nov  8 21:53:30 1987
Date-Received: Wed, 11-Nov-87 03:42:12 EST
Sender: daemon@ucbvax.BERKELEY.EDU
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>Can anyone tell me what I am doing that is wrong? 
>Also, what is it that a Process has that a Task doesn't that allows it to
>access AmigaDos.

	Yah, this is an easy one.  There are two problems.  (A) no arguments
are passed to test, (B) there is no CLI attached to test (look in the process
structure).  The result is that the startup code for TEST thinks it's being
executed from the workbench, and thus Wait()'s for the workbench packet.  You
can get around both problems by creating a custom startup.  With Aztec C,
execution starts at the .begin label, so you simply write a little assembly
module to overide the link library's .begin label.  I believe the source to
the standard Aztec C startup module is on your Aztec C master disks somewhere.
It is called crt0.asm or something like that.

>Can anyone tell me what I am doing that is wrong? 
>Also, what is it that a Process has that a Task doesn't that allows it to
>access AmigaDos.

	Take a look at a Task structure.  Now take a look at the Process
structure.  DOS uses most of the fields in the Process structure, but most
importantly it uses the message port in the Process structure to talk to
the packet oriented DOS device drivers.  You don't need a CLI entry to use
DOS, just a Process.

test.c:
	main()
	{
		Delay(100L);
		kprintf("Testing\n");
	}
ldr.c:
	#include <exec/types.h>
	main()
	{
		ULONG seg,LoadSeg();

		seg = LoadSeg("test");
		if (seg == 0)
		{
			printf ("Can't Load 'seg'\n");
			exit(1);
		}

		if (CreateProc("TEST",0L,seg,500L) == 0)
		{
			printf ("Can't CreateProc()\n");
			exit(1);
		}
		printf("done\n");
	}