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From: nix@rainbow.oulu.fi (Tero Manninen)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Does Execute() work the same on A3000?
Message-ID: <NIX.91Jun27173351@rainbow.oulu.fi>
Date: 27 Jun 91 15:33:51 GMT
Article-I.D.: rainbow.NIX.91Jun27173351
References: <1991Jun25.224054.24632@wehi.dn.mu.oz>
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In-reply-to: baxter_a@wehi.dn.mu.oz's message of 25 Jun 91 22:40:54 GMT


On 25 Jun 91 22:40:54 GMT,
baxter_a@wehi.dn.mu.oz said:

[...]
baxter> if (argc == 0)          /* running under workbench      */
baxter>         {
1.
baxter>         _ufbs[0].ufbfh = NULL;
baxter>         _ufbs[1].ufbfh = _ufbs[0].ufbfh;
baxter>         _ufbs[1].ufbflg = UFB_NC;
baxter>         _ufbs[2].ufbfh = _ufbs[0].ufbfh;
baxter>         _ufbs[2].ufbflg = UFB_NC;
2.
baxter>         handle = (struct FileHandle *)(_ufbs[0].ufbfh << 2);
baxter>         process = (struct Process *)FindTask(0);
3.
baxter>         process->pr_ConsoleTask = (APTR)handle->fh_Type;
baxter>         x = 0;
baxter>         }
baxter> else                    /* running under CLI            */
[...]
baxter> Which replaces the similar code from Lattice umain.c.
baxter> This works fine on my A500, and has no problem when later I use:
baxter>    Execute("failat >Nil: <Nil: 20 \n mount >Nil: <Nil: plt:",0,0);
baxter> However, on the A3000, under 1.3 or 2.0, it crashes.

I don't know about the cli part of your startup code, but clearly
in the workbench part you have an illegal memory reference:
- at point 1 you set stdin handle to zero
- at point 2 handle is set to (zero << 2) which is a null pointer.
- at point 3 you try to get pr_ConsoleTask from null filehandle
	     [ (struct FileHandle * 0)->fh_Type; ] !!

++Tero