🚀 go-pugleaf

> Summary: There is one use for BCPL on the Amiga
> 
> In <148600179@uiucuxc> Wayne Hamilton writes:
>>    now that i've said all that, you can probably just forget most of it.
>>BCPL doesn't provide any compelling advantage over C and assembler, so
>>there's not much reason to want to write programs with it.  buying the
>>book might be a good idea, if you're interested in hacking on the internals
>>of AmigaDos.
> 
> 	Yes, if you want to write an AmigaDOS device driver (not
> just an Exec device but an AmigaDOS device) you have to write the
> interface code in either BCPL or Assembler that looks like BCPL.
> Either way you have to learn about BCPL and its calling conventions,
> etc.  So, for example, if someone wanted to write an AmigaDOS device
> driver for the clipboard.device (HINT HINT) you would need to write
> the glue code in BCPL so you could access it through the filesystem
> (i.e., as in fopen("CLP:","r");) in the same manner as a regular file.
> This, of course, is a VERY useful thing to do, since almost all programs
> access files and so on through AmigaDOS devices rather than directly
> through Exec.  (It is unfortunate that we have two levels of devices,
> and that you cannot write AmigaDOS drivers in a completely compatible
> fashion in C.  This is the design legacy of Tripos.)
> 
> 				-Mitsu
> 
> 
> 	wayne hamilton
> 	U of Il and US Army Corps of Engineers CERL
> UUCP:	{ihnp4,pur-ee,convex}!uiucdcs!uiucuxc!hamilton
> ARPA:	hamilton%uiucuxc@a.cs.uiuc.edu	USMail:	Box 476, Urbana, IL 61801
> CSNET:	hamilton%uiucuxc@uiuc.csnet	Phone:	(217)333-8703
> CIS:    [73047,544]			PLink: w hamilton

I think you better look at an earlier posting I made "my-handler". A
AmigaDos handler written *totally* in C. Under release 1.2 you can specify
a GlobVec of -1 in the device node and when AmigaDos loads (creates) you he
won't try and start you up like a BCPL program... BTW, the initial packet is 
sent to you...you don't find it in D1. (if your GlobVec == -1 ) 

-phil

==============================================================================
  Phillip Lindsay - Commodore Business Machines - Amiga Technical Support
    Dirt: 1200 Wilson Drive, West Chester  PA 19380                
    uucp: {ihnp4|seismo|caip}!cbmvax!phillip
    arpa: cbmvax!phillip@seismo -or- phillip@cbmvax.UUCP@{seismo | harvard}
    Tel.: (215) 431-9180
Disclaimer: [someone said I needed this] No warranty is implied or otherwise
   given in the form of suggestion or example. Any opinions found here are of
   my making. [unless Fred pops up (my other self)] 
==============================================================================