src/code/target-extensions.lisp

   1 ;;;; This file contains things for the extensions packages (SB-EXT and
   2 ;;;; also "internal extensions" SB-INT) which can't be built at
   3 ;;;; cross-compile time, and perhaps also some things which might as
   4 ;;;; well not be built at cross-compile time because they're not
   5 ;;;; needed then. Things which can't be built at cross-compile time
   6 ;;;; (e.g. because they need machinery which only exists inside SBCL's
   7 ;;;; implementation of the LISP package) do not belong in this file.
   8
   9 ;;;; This software is part of the SBCL system. See the README file for
  10 ;;;; more information.
  11 ;;;;
  12 ;;;; This software is derived from the CMU CL system, which was
  13 ;;;; written at Carnegie Mellon University and released into the
  14 ;;;; public domain. The software is in the public domain and is
  15 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  16 ;;;; files for more information.
  17
  18 (in-package "SB!IMPL")
  19 \f
  20 ;;;; variables initialization and shutdown sequences
  21
  22 ;; (Most of the save-a-core functionality is defined later, in its
  23 ;; own file, but we'd like to have these symbols declared special
  24 ;; and initialized ASAP.)
  25 (defvar *save-hooks* nil
  26   #!+sb-doc
  27   "This is a list of functions which are called in an unspecified
  28 order before creating a saved core image. Unused by SBCL itself:
  29 reserved for user and applications.")
  30
  31 (defvar *init-hooks* nil
  32   #!+sb-doc
  33   "This is a list of functions which are called in an unspecified
  34 order when a saved core image starts up, after the system itself has
  35 been initialized. Unused by SBCL itself: reserved for user and
  36 applications.")
  37 \f
  38 ;;; like LISTEN, but any whitespace in the input stream will be flushed
  39 (defun listen-skip-whitespace (&optional (stream *standard-input*))
  40   (do ((char (read-char-no-hang stream nil nil nil)
  41              (read-char-no-hang stream nil nil nil)))
  42       ((null char) nil)
  43     (cond ((not (whitespacep char))
  44            (unread-char char stream)
  45            (return t)))))
  46 \f
  47 ;;;; helpers for C library calls
  48
  49 ;;; Signal a SIMPLE-CONDITION/ERROR condition associated with an ANSI C
  50 ;;; errno problem, arranging for the condition's print representation
  51 ;;; to be similar to the ANSI C perror(3) style.
  52 (defun simple-perror (prefix-string
  53                       &key
  54                       (errno (get-errno))
  55                       (simple-error 'simple-error)
  56                       other-condition-args)
  57   (declare (type symbol simple-error))
  58   (aver (subtypep simple-error 'simple-condition))
  59   (aver (subtypep simple-error 'error))
  60   (apply #'error
  61          simple-error
  62          :format-control "~@<~A: ~2I~_~A~:>"
  63          :format-arguments (list prefix-string (strerror errno))
  64          other-condition-args))