/usr/share/scheme48-1.9/posix/syslog.scm is in scheme48 1.9-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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; Authors: Mike Sperber
; Error codes
(import-dynamic-externals "=scheme48external/posix")
(define-enumerated-type syslog-option :syslog-option
syslog-option?
the-syslog-options
syslog-option-name
syslog-option-index
;; The order of these is known to the C code.
(console
delay
no-delay
log-pid
no-wait))
(define-enum-set-type syslog-options :syslog-options
syslog-options?
make-syslog-options
syslog-option
syslog-option?
the-syslog-options
syslog-option-index)
(define default-syslog-options (syslog-options))
(define-enumerated-type syslog-facility :syslog-facility
syslog-facility?
syslog-facilities
syslog-facility-name
syslog-facility-index
;; Options for openlog
;; The order of these is known to the C code.
(authorization
cron
daemon
kernel
lpr
mail
news
user
uucp
local0 local1 local2 local3 local4 local5 local6 local7))
(define default-syslog-facility (syslog-facility user))
(define-enumerated-type syslog-level :syslog-level
syslog-level?
syslog-levels
syslog-level-name
syslog-level-index
;; The order of these is known to the C code.
(emergency
alert
critical
error
warning
notice
info
debug))
(define-enum-set-type syslog-mask :syslog-mask
syslog-mask?
make-syslog-mask
syslog-level
syslog-level?
syslog-levels
syslog-level-index)
(define (syslog-mask-upto level)
(let loop ((index (syslog-level-index level)) (levels '()))
(if (< index 0)
(make-syslog-mask levels)
(loop (- index 1)
(cons (vector-ref syslog-levels index)
levels)))))
(define syslog-mask-all (make-syslog-mask (vector->list syslog-levels)))
(define default-syslog-mask syslog-mask-all)
; Low-level interface
(import-lambda-definition-2 posix-openlog (ident options facility) "posix_openlog")
(import-lambda-definition-2 posix-setlogmask (logmask) "posix_setlogmask")
(import-lambda-definition-2 posix-syslog (level facility message) "posix_syslog")
(import-lambda-definition-2 posix-closelog () "posix_closelog")
(define (openlog ident options facility)
(if (not (syslog-options? options))
(assertion-violation 'openlog "options argument is not a :syslog-options object" options))
(posix-openlog (x->os-byte-vector ident)
(enum-set->integer options)
(syslog-facility-index facility)))
(define (setlogmask! logmask)
(if (not (syslog-mask? logmask))
(assertion-violation 'openlog "mask argument is not a :syslog-mask object" logmask))
(posix-setlogmask (enum-set->integer logmask)))
(define (syslog-internal level facility message)
(posix-syslog (syslog-level-index level)
(and facility
(syslog-facility-index facility))
(x->os-byte-vector message)))
(define (closelog)
(posix-closelog))
; High-level interface
(define-record-type syslog-channel :syslog-channel
(really-make-syslog-channel ident options facility mask)
syslog-channel?
(ident syslog-channel-ident)
(options syslog-channel-options)
(facility syslog-channel-facility)
(mask syslog-channel-mask))
(define (make-syslog-channel ident options facility mask)
(really-make-syslog-channel (x->os-string ident)
options facility mask))
(define (syslog-channel-equivalent? channel-1 channel-2)
(and (os-string=? (syslog-channel-ident channel-1)
(syslog-channel-ident channel-2))
(enum-set=? (syslog-channel-options channel-1)
(syslog-channel-options channel-2))
;; facility can be specified with each syslog-write
(enum-set=? (syslog-channel-mask channel-1)
(syslog-channel-mask channel-2))))
(define current-syslog-channel 'unitinialized)
(define current-syslog-channel-lock 'unitinialized)
(define (initialize-syslog)
(set! current-syslog-channel #f)
(set! current-syslog-channel-lock (make-lock)))
(define open-syslog-channel make-syslog-channel)
(define (close-syslog-channel channel)
(obtain-lock current-syslog-channel-lock)
(if (syslog-channel-equivalent? channel
current-syslog-channel)
(closelog))
(release-lock current-syslog-channel-lock))
(define (with-syslog-channel channel thunk)
(dynamic-wind
(lambda ()
(obtain-lock current-syslog-channel-lock))
(lambda ()
(if (or (not current-syslog-channel)
(not (syslog-channel-equivalent? channel
current-syslog-channel)))
(begin
(if current-syslog-channel
(closelog))
(openlog (syslog-channel-ident channel)
(syslog-channel-options channel)
(syslog-channel-facility channel))
(if (not (enum-set=? (syslog-channel-mask channel)
default-syslog-mask))
(setlogmask! (syslog-channel-mask channel)))
(set! current-syslog-channel channel)))
(thunk))
(lambda ()
(release-lock current-syslog-channel-lock))))
(define (syslog-write level message channel)
(with-syslog-channel
channel
(lambda ()
(syslog-internal level (syslog-channel-facility channel) message))))
(define (change-syslog-channel channel ident options facility mask)
(make-syslog-channel (if ident
(x->os-string ident)
(syslog-channel-ident channel))
(or options
(syslog-channel-options channel))
(or facility
(syslog-channel-facility channel))
(or mask
(syslog-channel-mask channel))))
; This is a thread fluid in scsh
(define dynamic-syslog-channel
(make-fluid
(make-syslog-channel "s48"
default-syslog-options
default-syslog-facility
default-syslog-mask)))
(define (syslog level message . rest)
(syslog-write level message
(cond
((null? rest)
(fluid dynamic-syslog-channel))
((and (null? (cdr rest))
(syslog-channel? (car rest)))
(car rest))
(else
;; this might be a little excessive allocation
(apply change-syslog-channel
(fluid dynamic-syslog-channel)
(append rest '(#f)))))))
(define (with-syslog-destination ident options facility mask thunk)
(let-fluid dynamic-syslog-channel
(change-syslog-channel
(fluid dynamic-syslog-channel)
ident options facility mask)
thunk))
;----------------
; A record type whose only purpose is to run some code when we start up an
; image.
(define-record-type reinitializer :reinitializer
(make-reinitializer thunk)
reinitializer?
(thunk reinitializer-thunk))
(define-record-discloser :reinitializer
(lambda (r)
(list 'reinitializer (reinitializer-thunk r))))
(define-record-resumer :reinitializer
(lambda (r)
((reinitializer-thunk r))))
(initialize-syslog)
(define syslog-reinitializer
(make-reinitializer initialize-syslog))
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