;;; -*- Mode: Scheme -*-

;;;; RUN-PROGRAM Routine

;;; Copyright (c) 2009, Taylor R. Campbell
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; * Redistributions of source code must retain the above copyright
;;;   notice, this list of conditions and the following disclaimer.
;;;
;;; * Redistributions in binary form must reproduce the above copyright
;;;   notice, this list of conditions and the following disclaimer in
;;;   the documentation and/or other materials provided with the
;;;   distribution.
;;;
;;; * Neither the names of the authors nor the names of contributors
;;;   may be used to endorse or promote products derived from this
;;;   software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

(define (run-program executable name&arguments environment)
  (let ((interrupts (set-enabled-interrupts! 0)))
    (let ((process-id (fork)))
      (if process-id
          (begin
            (set-enabled-interrupts! interrupts)
            (wait-for-child-process process-id)
            (let ((exit-status (process-id-exit-status process-id))
                  (signal (process-id-terminating-signal process-id)))
              (if (not (zero? exit-status))
                  (error "Subprocess exited abnormally:"
                         name&arguments
                         exit-status
                         signal))))
          (with-handler (lambda (condition propagate)
                          propagate     ;ignore
                          (display-condition condition (current-output-port))
                          (exit 1))
            (lambda ()
              (exec-with-alias executable #t environment name&arguments)))))))