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Turnbull China Bikeride
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Turnbull China Bikeride - Disc 2.iso
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CFuncs
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1991-09-13
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2KB
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65 lines
"======================================================================
|
| SystemDictionary Method Definitions
|
======================================================================"
"======================================================================
|
| Copyright (C) 1990, 1991 Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| This file is part of GNU Smalltalk.
|
| GNU Smalltalk is free software; you can redistribute it and/or modify it
| under the terms of the GNU General Public License as published by the Free
| Software Foundation; either version 1, or (at your option) any later version.
|
| GNU Smalltalk is distributed in the hope that it will be useful, but WITHOUT
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
| FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
| details.
|
| You should have received a copy of the GNU General Public License along with
| GNU Smalltalk; see the file COPYING. If not, write to the Free Software
| Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
======================================================================"
"
| Change Log
| ============================================================================
| Author Date Change
| sbyrne 8 Jul 89 Created.
|
"
Object variableSubclass: #CFunctionDescriptor
instanceVariableNames: 'cFunction cFunctionName returnType numFixedArgs'
classVariableNames: ''
poolDictionaries: ''
category: nil !
CFunctionDescriptor comment:
'I am not part of the Smalltalk definition. My instances contain information
about C functions that can be called from within Smalltalk, such as number
and type of parameters. This information is used by the C callout mechanism
to perform the actual call-out to C routines.' !
"A couple of simple, but useful callout functions, as examples."
Behavior defineCFunc: 'system'
withSelectorArgs: 'system: aString'
forClass: SystemDictionary
returning: #int
args: #(string)!
Behavior defineCFunc: 'getenv'
withSelectorArgs: 'getenv: aString'
forClass: SystemDictionary
returning: #string
args: #(string)!