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+#| -*-Scheme-*-
+
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/runtime/process.scm,v 1.1 1990/02/27 19:45:28 markf Exp $
+
+Copyright (c) 1989 Massachusetts Institute of Technology
+
+This material was developed by the Scheme project at the Massachusetts
+Institute of Technology, Department of Electrical Engineering and
+Computer Science.  Permission to copy this software, to redistribute
+it, and to use it for any purpose is granted, subject to the following
+restrictions and understandings.
+
+1. Any copy made of this software must include this copyright notice
+in full.
+
+2. Users of this software agree to make their best efforts (a) to
+return to the MIT Scheme project any improvements or extensions that
+they make, so that these may be included in future releases; and (b)
+to inform MIT of noteworthy uses of this software.
+
+3. All materials developed as a consequence of the use of this
+software shall duly acknowledge such use, in accordance with the usual
+standards of acknowledging credit in academic research.
+
+4. MIT has made no warrantee or representation that the operation of
+this software will be error-free, and MIT is under no obligation to
+provide any services, by way of maintenance, update, or otherwise.
+
+5. In conjunction with products arising from the use of this material,
+there shall be no use of the name of the Massachusetts Institute of
+Technology nor of any adaptation thereof in any advertising,
+promotional, or sales literature without prior written consent from
+MIT in each case. |#
+
+;;;; Subprocess support
+;;; package: (runtime subprocesses)
+
+(declare (usual-integrations))
+\f
+(define (initialize-package!)
+  unspecific)
+
+(let-syntax
+    ((define-special-primitives
+       (macro names
+        `(define-primitives
+           ,@(map (lambda (name)
+                    (list (symbol-append 'prim- name)
+                          name))
+                  names)))))
+  (define-special-primitives
+      create-process
+      process-get-pid
+      process-get-input-channel
+      process-get-output-channel
+      process-get-status-flags
+      process-char-ready?))
+
+(let-syntax
+    ((define-process-primitives
+       (macro names
+        `(BEGIN ,@(map (lambda (name)
+                         `(BEGIN
+                            (define (,name process)
+                              (,(symbol-append 'prim- name)
+                               (process/microcode-process process)))))
+                       names)))))
+  (define-process-primitives
+    process-get-pid
+    process-get-input-channel
+    process-get-output-channel
+    process-get-status-flags))
+
+(define-structure (process
+                  (type vector)
+                  (named)
+                  (conc-name process/)
+                  (constructor make-process
+                               (command-string microcode-process)))
+  (command-string false read-only true)                ;original command
+  (microcode-process false read-only true)     ;index into microcode
+                                               ;process table
+  (to-port false)                              ;port to write to process
+  (from-port false)                            ;port to read from process
+  )
+
+(define prim/create-process (make-primitive-procedure 'create-process))
+
+(define (create-process command-string)
+  (let* ((prim-process (prim-create-process command-string))
+        (process (make-process command-string prim-process)))
+    (set-process/to-port! process (open-process-output process))
+    (set-process/from-port! process (open-process-input process))
+    process))
+
+(define (kill-process process)
+  ((ucode-primitive kill-process) (process/microcode-process process)))
+
+(define (delete-process process)
+  ((input-port/custom-operation to-port 'close) (process/to-port process))
+  (kill-process process))
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