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; Copyright (c) 1993-2008 by Richard Kelsey and Jonathan Rees. See file COPYING.
; Access to Posix process environment
(import-dynamic-externals "=scheme48external/posix")
; We multiplex a bunch of these to save typing.
;----------------
; 4.1 Process Identification
(define (get-process-id)
(call-imported-binding posix-get-pid #f))
(define (get-parent-process-id)
(call-imported-binding posix-get-pid #t))
;----------------
; 4.2 User Identification and 4.3 Process Groups
(define (get-user-id)
(call-imported-binding posix-get-id #t #t))
(define (get-effective-user-id)
(call-imported-binding posix-get-id #t #f))
(define (get-group-id)
(call-imported-binding posix-get-id #f #t))
(define (get-effective-group-id)
(call-imported-binding posix-get-id #f #f))
(define (set-user-id! user-id)
(call-imported-binding posix-set-id! #t user-id))
(define (set-group-id! group-id)
(call-imported-binding posix-set-id! #f group-id))
(import-definition posix-get-pid)
(import-definition posix-get-id)
(import-definition posix-set-id! "posix_set_id")
(define (get-groups)
(call-imported-binding posix-get-groups))
(define (get-login-name)
(call-imported-binding posix-get-login))
(import-definition posix-get-groups)
(import-definition posix-get-login)
(import-lambda-definition posix-set-sid ())
;----------------
; 4.4 System Identification
;
; The five values returned by uname().
(import-lambda-definition posix-sys-name (which))
(define (os-name) (posix-sys-name 0))
(define (os-node-name) (posix-sys-name 1))
(define (os-release-name) (posix-sys-name 2))
(define (os-version-name) (posix-sys-name 3))
(define (machine-name) (posix-sys-name 4))
;----------------
; 4.5 Get Process Times
;
;----------------
; 4.6 Environment Variables
; We cheat here by using one type for both the variable names and
; their values. The rules are the same for both, after all.
(define (lookup-environment-variable name)
(cond
((external-lookup-environment-variable
(os-string->byte-vector
(x->os-string name)))
=> x->os-string)
(else #f)))
(define (lookup-environment-variable->string name)
(cond
((lookup-environment-variable name)
=> os-string->string)
(else #f)))
(define (environment-alist)
(map (lambda (pair)
(cons (x->os-string (car pair))
(x->os-string (cdr pair))))
(external-environment-alist)))
(define (environment-alist-as-strings)
(map (lambda (pair)
(cons (os-string->string (car pair))
(os-string->string (cdr pair))))
(environment-alist)))
(import-lambda-definition external-lookup-environment-variable (name) "posix_get_env")
(import-lambda-definition external-environment-alist () "posix_get_env_alist")
;----------------
; 4.7 Terminal Identification
; See io.scm.
;----------------
; 4.8 Configurable System Variables
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