707 lines
20 KiB
Scheme
707 lines
20 KiB
Scheme
;;; POSIX system-call Scheme binding.
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;;; Copyright (c) 1993 by Olin Shivers.
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;;; Scheme48 implementation.
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;;; Need to rationalise names here. getgid. get-gid. "effective" as morpheme?
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Import a C function and convert the exception os-error to a syscall-error
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;;;
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;;; 1.) Import a C function
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;;; 2.) Turn os-error into syscall-error
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;;; 3.) Retry on EINTR
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;;; The call/cc and the record is due to S48's broken exception system:
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;;; You can't throw an error within a handler
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;;;
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;;; Move this to somewhere else as soon as Marc published his SRFI
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(define (continuation-capture receiver)
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((call-with-current-continuation
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(lambda (cont)
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(lambda () (receiver cont))))))
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(define (continuation-graft cont thunk)
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(cont thunk))
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(define (continuation-return cont . returned-values)
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(continuation-graft
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cont
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(lambda () (apply values returned-values))))
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(define-syntax import-os-error-syscall
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(syntax-rules ()
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((import-os-error-syscall syscall (%arg ...) c-name)
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(begin
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(import-lambda-definition syscall/eintr (%arg ...) c-name)
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(define (syscall %arg ...)
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(let ((arg %arg) ...)
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(continuation-capture
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(lambda (cont)
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(let loop ()
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(with-handler
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(lambda (condition more)
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(if (and (exception? condition) (eq? (exception-reason condition)
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'os-error))
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(let ((stuff (exception-arguments condition)))
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(if (= (cadr stuff) errno/intr)
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(loop)
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(continuation-graft
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cont
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(lambda ()
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(apply errno-error
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(cadr stuff) ; errno
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(caddr stuff) ;msg
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syscall
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(cdddr stuff)))))) ;packet
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(more)))
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(lambda ()
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(syscall/eintr %arg ...))))))))))))
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;;; Process
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; we can't algin env here, because exec-path/env calls
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;; %%exec/errno directly F*&% *P
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(import-os-error-syscall %%exec (prog argv env) "scheme_exec")
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(define (%exec prog arg-list env)
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(let ((argv (mapv! stringify (list->vector arg-list)))
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(prog (stringify prog))
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(env (if (eq? env #t) #t (alist->env-vec env))))
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(%%exec prog argv env)))
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(import-os-error-syscall exit/errno ; errno -- misnomer.
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(status) "scsh_exit")
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(import-os-error-syscall %exit/errno ; errno -- misnomer
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(status) "scsh__exit")
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(define (%exit . maybe-status)
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(%exit/errno (:optional maybe-status 0))
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(error "Yikes! %exit returned."))
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(import-os-error-syscall %%fork () "scsh_fork")
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;;; Posix waitpid(2) call.
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(import-os-error-syscall %wait-pid/list (pid options) "wait_pid")
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(define (%wait-pid pid options)
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(apply values (%wait-pid/list pid options)))
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;;; Miscellaneous process state
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Working directory
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(import-os-error-syscall %chdir (directory) "scsh_chdir")
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;;; These calls change/reveal the process working directory
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;;;
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(define (process-chdir . maybe-dir)
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(let ((dir (:optional maybe-dir (home-dir))))
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(%chdir (ensure-file-name-is-nondirectory dir))))
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;; TODO: we get an error if cwd does not exist on startup
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(import-os-error-syscall process-cwd () "scheme_cwd")
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;;; GID
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(import-os-error-syscall user-gid () "scsh_getgid")
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(import-os-error-syscall user-effective-gid () "scsh_getegid")
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(import-os-error-syscall set-gid (gid) "scsh_setgid")
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(import-os-error-syscall set-effective-gid (gid) "scsh_setegid")
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(import-os-error-syscall user-supplementary-gids () "get_groups")
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;;; UID
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(import-os-error-syscall user-uid () "scsh_getuid")
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(import-os-error-syscall user-effective-uid () "scsh_geteuid")
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(import-os-error-syscall set-uid (uid) "scsh_setuid")
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(import-os-error-syscall set-effective-uid (uid) "scsh_seteuid")
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(import-os-error-syscall %user-login-name () "my_username")
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(define (user-login-name)
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(or (%user-login-name)
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(error "Cannot get your name")))
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;;; PID
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(import-os-error-syscall pid () "scsh_getpid")
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(import-os-error-syscall parent-pid () "scsh_getppid")
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;;; Process groups and session ids
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(import-os-error-syscall process-group () "scsh_getpgrp")
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(import-os-error-syscall %set-process-group (pid groupid) "scsh_setpgid")
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(define (set-process-group arg1 . maybe-arg2)
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(receive (pid pgrp) (if (null? maybe-arg2)
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(values (pid) arg1)
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(values arg1 (car maybe-arg2)))
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(%set-process-group pid pgrp)))
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(import-os-error-syscall become-session-leader () "scsh_setsid")
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;;; UMASK
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(import-os-error-syscall set-process-umask (mask) "scsh_umask")
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(define (process-umask)
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(let ((m (set-process-umask 0)))
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(set-process-umask m)
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m))
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;;; PROCESS TIMES
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;;; OOPS: The POSIX times() has a mildly useful ret value we are throwing away.
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(import-os-error-syscall process-times/list () "process_times")
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(define (process-times)
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(apply values (process-times/list)))
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(import-os-error-syscall cpu-ticks/sec () "cpu_clock_ticks_per_sec")
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;;; File system
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Useful little utility for generic ops that work on filenames, fd's or
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;;; ports.
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(define (generic-file-op thing fd-op fname-op)
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(if (string? thing) (with-cwd-aligned (fname-op thing))
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(call/fdes thing fd-op)))
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(import-os-error-syscall %set-file-mode (path mode) "scsh_chmod")
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(import-os-error-syscall %set-fdes-mode (path mode) "scsh_fchmod")
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(define (set-file-mode thing mode)
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(generic-file-op thing
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(lambda (fd) (%set-fdes-mode fd mode))
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(lambda (fname) (%set-file-mode fname mode))))
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(import-os-error-syscall set-file-uid&gid (path uid gid) "scsh_chown")
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(import-os-error-syscall set-fdes-uid&gid (fd uid gid) "scsh_fchown")
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(define (set-file-owner thing uid)
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(generic-file-op thing
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(lambda (fd) (set-fdes-uid&gid fd uid -1))
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(lambda (fname) (set-file-uid&gid fname uid -1))))
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(define (set-file-group thing gid)
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(generic-file-op thing
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(lambda (fd) (set-fdes-uid&gid fd -1 gid))
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(lambda (fname) (set-file-uid&gid fname -1 gid))))
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;;; Uses real uid and gid, not effective. I don't use this anywhere.
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(import-os-error-syscall %file-ruid-access-not? (path perms) "scsh_access")
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;(define (file-access? path perms)
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; (not (%file-access-not? path perms)))
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;
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;(define (file-executable? fname)
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; (file-access? fname 1))
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;
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;(define (file-writable? fname)
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; (file-access? fname 2))
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;
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;(define (file-readable? fname)
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; (file-access? fname 4))
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(import-os-error-syscall %create-hard-link (original-name new-name)
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"scsh_link")
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(import-os-error-syscall %create-fifo (path mode) "scsh_mkfifo")
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(import-os-error-syscall %%create-directory (path mode) "scsh_mkdir")
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(define (%create-directory path . maybe-mode)
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(let ((mode (:optional maybe-mode #o777))
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(fname (ensure-file-name-is-nondirectory path)))
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(%%create-directory fname mode)))
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(import-os-error-syscall read-symlink (path) "scsh_readlink")
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(import-os-error-syscall %rename-file (old-name new-name) "scsh_rename")
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(import-os-error-syscall delete-directory (path) "scsh_rmdir")
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(import-os-error-syscall %utime (path ac m) "scm_utime")
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(import-os-error-syscall %utime-now (path) "scm_utime_now")
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;;; (SET-FILE-TIMES path [access-time mod-time])
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(define (set-file-times path . maybe-times)
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(if (pair? maybe-times)
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(let* ((access-time (real->exact-integer (car maybe-times)))
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(mod-time (if (pair? (cddr maybe-times))
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(error "Too many arguments to set-file-times/errno"
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(cons path maybe-times))
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(real->exact-integer (cadr maybe-times)))))
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(%utime path access-time
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mod-time ))
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(%utime-now path)))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; STAT
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(import-os-error-syscall stat-file (path data chase?) "scheme_stat")
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(import-os-error-syscall stat-fdes (fd data) "scheme_fstat")
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(define-record file-info
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type
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device
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inode
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mode
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nlinks
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uid
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gid
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size
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atime
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mtime
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ctime
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)
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;;; Should be redone to return multiple-values.
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(define (%file-info fd/port/fname chase?)
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(let ((ans-vec (make-vector 11))
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(file-type (lambda (type-code)
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(vector-ref '#(block-special char-special directory fifo
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regular socket symlink)
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type-code))))
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(generic-file-op fd/port/fname
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(lambda (fd)
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(stat-fdes fd ans-vec))
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(lambda (fname)
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(stat-file fname ans-vec chase?)))
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(make-file-info (file-type (vector-ref ans-vec 0))
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(vector-ref ans-vec 1)
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(vector-ref ans-vec 2)
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(vector-ref ans-vec 3)
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(vector-ref ans-vec 4)
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(vector-ref ans-vec 5)
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(vector-ref ans-vec 6)
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(vector-ref ans-vec 7)
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(vector-ref ans-vec 8)
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(vector-ref ans-vec 9)
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(vector-ref ans-vec 10))))
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(define (file-info fd/port/fname . maybe-chase?)
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(with-cwd-aligned
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(let ((chase? (:optional maybe-chase? #t)))
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(%file-info fd/port/fname chase?))))
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(define file-attributes
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(deprecated-proc file-info "file-attributes" "Use file-info instead."))
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;;; "no-declare" as there is no agreement among the OS's as to whether or not
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;;; the OLD-NAME arg is "const". It *should* be const.
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(import-os-error-syscall %create-symlink (old-name new-name) "scsh_symlink")
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;;; "no-declare" as there is no agreement among the OS's as to whether or not
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;;; the PATH arg is "const". It *should* be const.
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(import-os-error-syscall %truncate-file (path length) "scsh_truncate")
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(import-os-error-syscall %truncate-fdes (path length) "scsh_ftruncate")
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(define (truncate-file thing length)
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(generic-file-op thing
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(lambda (fd) (%truncate-fdes fd length))
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(lambda (fname) (%truncate-file fname length))))
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(import-os-error-syscall %delete-file (path) "scsh_unlink")
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(define (delete-file path)
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(with-cwd-aligned (%delete-file path)))
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(import-os-error-syscall %sync-file (fd) "scsh_fsync")
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(define (sync-file fd/port)
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(if (output-port? fd/port) (force-output fd/port))
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(sleazy-call/fdes fd/port %sync-file))
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;;; Amazingly bogus syscall -- doesn't *actually* sync the filesys.
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(import-os-error-syscall sync-file-system () "scsh_sync")
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;;; I/O
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(import-os-error-syscall %close-fdes (fd) "scsh_close")
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(import-os-error-syscall %dup (fd) "scsh_dup")
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(import-os-error-syscall %dup2 (fd-from fd-to) "scsh_dup2")
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(import-os-error-syscall %fd-seek (fd offset whence) "scsh_lseek")
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(define seek/set 0) ;Unix codes for "whence"
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(define seek/delta 1)
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(define seek/end 2)
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(define (seek fd/port offset . maybe-whence)
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(let ((whence (:optional maybe-whence seek/set))
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(fd (if (integer? fd/port) fd/port (port->fdes fd/port))))
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(%fd-seek fd offset whence)))
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(define (tell fd/port)
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(let ((fd (if (integer? fd/port) fd/port (port->fdes fd/port))))
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(%fd-seek fd 0 seek/delta)))
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(import-os-error-syscall %char-ready-fdes? (fd) "char_ready_fdes")
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(import-os-error-syscall %open (path flags mode) "scsh_open")
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(define (open-fdes path flags . maybe-mode) ; mode defaults to 0666
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(with-cwd-aligned
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(with-umask-aligned
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(%open path flags (:optional maybe-mode #o666)))))
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(import-os-error-syscall pipe-fdes () "scheme_pipe")
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(define (pipe)
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(apply (lambda (r-fd w-fd)
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(let ((r (fdes->inport r-fd))
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(w (fdes->outport w-fd)))
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(release-port-handle r)
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(release-port-handle w)
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(values r w)))
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(pipe-fdes)))
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;;; Signals (rather incomplete)
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;;; ---------------------------
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(import-os-error-syscall signal-pid (pid signal) "scsh_kill")
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(define (signal-process proc signal)
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(signal-pid (cond ((proc? proc) (proc:pid proc))
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((integer? proc) proc)
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(else (error "Illegal proc passed to signal-process" proc)))
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signal))
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(define (signal-process-group proc-group signal)
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(signal-pid (- (cond ((proc? proc-group) (proc:pid proc-group))
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((integer? proc-group) proc-group)
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(else (error "Illegal proc passed to signal-process-group"
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proc-group))))
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signal))
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(define (itimer sec)
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((structure-ref sigevents schedule-timer-interrupt!) (* sec 1000)))
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;;; SunOS, not POSIX:
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;;; (define-foreign signal-process-group/errno
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;;; (killpg (integer proc-group) (integer signal))
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;;; (to-scheme integer errno_or_false))
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;;;
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;;; (define-errno-syscall (signal-process-group proc-group signal)
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;;; signal-process-group/errno)
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(define (pause-until-interrupt)
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(next-sigevent (most-recent-sigevent) full-interrupt-set))
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;;; User info
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define-record user-info
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name uid gid home-dir shell
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;; Make user-info records print like #{user-info shivers}.
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((disclose ui)
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(list "user-info" (user-info:name ui))))
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(import-os-error-syscall
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%uid->user-info
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(uid user-info-record)
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"user_info_uid")
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(import-os-error-syscall
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%name->user-info
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(name user-info-record)
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"user_info_name")
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(define (uid->user-info uid)
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(let ((empty-user-info (make-user-info #f uid #f #f #f)))
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(if (%uid->user-info uid empty-user-info)
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empty-user-info
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(error "Cannot get user's information" uid->user-info uid))))
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(define (name->user-info name)
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(let ((empty-user-info (make-user-info name #f #f #f #f)))
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(if (%name->user-info name empty-user-info)
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empty-user-info
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(error "Cannot get user's information" name->user-info name))))
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(define (user-info uid/name)
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((cond ((string? uid/name) name->user-info)
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((integer? uid/name) uid->user-info)
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(else (error "user-info arg must be string or integer" uid/name)))
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uid/name))
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;;; Derived functions
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(define (->uid uid/name)
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(user-info:uid (user-info uid/name)))
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(define (->username uid/name)
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(user-info:name (user-info uid/name)))
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(define (%homedir uid/name)
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(user-info:home-dir (user-info uid/name)))
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;;; Group info
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define-record group-info
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name gid members
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;; Make group-info records print like #{group-info wheel}.
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((disclose gi) (list "group-info" (group-info:name gi))))
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(import-os-error-syscall
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%gid->group-info
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(gid group-info-record)
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"group_info_gid")
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(import-os-error-syscall
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%name->group-info
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(name group-info-record)
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"group_info_name")
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(define (gid->group-info gid)
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(let ((empty-group-info (make-group-info #f gid #f)))
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(if (%gid->group-info gid empty-group-info)
|
|
empty-group-info
|
|
(error "Cannot get group's information for gid" gid))))
|
|
|
|
(define (name->group-info name)
|
|
(let ((empty-group-info (make-group-info name #f #f)))
|
|
(if (%name->group-info name empty-group-info)
|
|
empty-group-info
|
|
(error "Cannot get group's information for name" name))))
|
|
|
|
(define (group-info gid/name)
|
|
((cond ((string? gid/name) name->group-info)
|
|
((integer? gid/name) gid->group-info)
|
|
(else (error "group-info arg must be string or integer" gid/name)))
|
|
gid/name))
|
|
|
|
;;; Derived functions
|
|
|
|
(define (->gid name)
|
|
(group-info:gid (group-info name)))
|
|
|
|
(define (->groupname gid)
|
|
(group-info:name (group-info gid)))
|
|
|
|
;;; Directory stuff
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(import-os-error-syscall %open-dir (dir-name) "open_dir")
|
|
|
|
(define (directory-files . args)
|
|
(with-cwd-aligned
|
|
(let-optionals args ((dir ".")
|
|
(dotfiles? #f))
|
|
(check-arg string? dir directory-files)
|
|
(let* ((files (%open-dir (ensure-file-name-is-nondirectory dir)))
|
|
(files-sorted ((structure-ref sort sort-list!) files filename<=)))
|
|
(if dotfiles? files-sorted
|
|
(filter (lambda (f) (not (dotfile? f)))
|
|
files-sorted))))))
|
|
|
|
(define (dotfile? f)
|
|
(char=? (string-ref f 0) #\.))
|
|
|
|
(define (filename<= f1 f2)
|
|
(if (dotfile? f1)
|
|
(if (dotfile? f2)
|
|
(string<= f1 f2)
|
|
#t)
|
|
(if (dotfile? f2)
|
|
#f
|
|
(string<= f1 f2))))
|
|
|
|
;;; I do this one in C, I'm not sure why:
|
|
;;; It is used by MATCH-FILES.
|
|
;;; 99/7: No one is using this function, so I'm commenting it out.
|
|
;;; Later, we could tune up the globber or regexp file-matcher to use
|
|
;;; it (but should shift it into the rx directory). But I should also go
|
|
;;; to a file-at-a-time cursor model for directory fetching. -Olin
|
|
|
|
;(define-foreign %filter-C-strings!
|
|
; (filter_stringvec (string pattern) ((C "char const ** ~a") cvec))
|
|
; static-string ; error message -- #f if no error.
|
|
; integer) ; number of files that pass the filter.
|
|
|
|
|
|
;(define (match-files regexp . maybe-dir)
|
|
; (let ((dir (:optional maybe-dir ".")))
|
|
; (check-arg string? dir match-files)
|
|
; (receive (err cvec numfiles)
|
|
; (%open-dir (ensure-file-name-is-nondirectory dir))
|
|
; (if err (errno-error err match-files regexp dir))
|
|
; (receive (err numfiles) (%filter-C-strings! regexp cvec)
|
|
; (if err (error err match-files))
|
|
; (%sort-file-vector cvec numfiles)
|
|
; (let ((files (C-string-vec->Scheme&free cvec numfiles)))
|
|
; (vector->list files))))))
|
|
|
|
|
|
;;; Environment manipulation
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
;;; (var . val) / "var=val" rep conversion:
|
|
|
|
|
|
|
|
(define (split-env-string var=val)
|
|
(let ((i (string-index var=val #\=)))
|
|
(if i (values (substring var=val 0 i)
|
|
(substring var=val (+ i 1) (string-length var=val)))
|
|
(error "No \"=\" in environment string" var=val))))
|
|
|
|
(define (env-list->alist env-list)
|
|
(map (lambda (var=val)
|
|
(call-with-values (lambda () (split-env-string var=val))
|
|
cons))
|
|
env-list))
|
|
|
|
(define (alist->env-vec alist)
|
|
(list->vector (map (lambda (var.val)
|
|
(string-append (car var.val) "="
|
|
(let ((val (cdr var.val)))
|
|
(if (string? val) val
|
|
(string-join val ":")))))
|
|
alist)))
|
|
|
|
;;; ENV->ALIST
|
|
|
|
(import-os-error-syscall %load-env () "scm_envvec")
|
|
|
|
(define (environ-env->alist)
|
|
(let ((env-list.envvec (%load-env)))
|
|
(cons (env-list->alist (car env-list.envvec))
|
|
(cdr env-list.envvec))))
|
|
|
|
|
|
;;; ALIST->ENV
|
|
|
|
;;; (%create-env ((vector 'X) -> address))
|
|
(import-os-error-syscall %create-env (envvec) "create_env")
|
|
|
|
;;; assumes aligned env
|
|
(define (envvec-alist->env alist)
|
|
(%create-env (alist->env-vec alist)))
|
|
|
|
(import-os-error-syscall %align-env (envvec) "align_env")
|
|
|
|
(import-os-error-syscall %free-env (envvec) "free_envvec")
|
|
|
|
|
|
;;; Fd-ports
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(import-os-error-syscall %set-cloexec (fd val) "set_cloexec")
|
|
|
|
;;; Some of fcntl()
|
|
;;;;;;;;;;;;;;;;;;;
|
|
|
|
(import-os-error-syscall %fcntl-read (fd command) "fcntl_read")
|
|
(import-os-error-syscall %fcntl-write (fd command val) "fcntl_write")
|
|
|
|
;;; fcntl()'s F_GETFD and F_SETFD. Note that the SLEAZY- prefix on the
|
|
;;; CALL/FDES isn't an optimisation; it's *required* for the correct behaviour
|
|
;;; of these procedures. Straight CALL/FDES modifies unrevealed file
|
|
;;; descriptors by clearing their CLOEXEC bit when it reveals them -- so it
|
|
;;; would interfere with the reading and writing of that bit!
|
|
|
|
(define (fdes-flags fd/port)
|
|
(sleazy-call/fdes fd/port
|
|
(lambda (fd) (%fcntl-read fd fcntl/get-fdes-flags))))
|
|
|
|
(define (set-fdes-flags fd/port flags)
|
|
(sleazy-call/fdes fd/port
|
|
(lambda (fd) (%fcntl-write fd fcntl/set-fdes-flags flags))))
|
|
|
|
;;; fcntl()'s F_GETFL and F_SETFL.
|
|
;;; Get: Returns open flags + get-status flags (below)
|
|
;;; Set: append, sync, async, nbio, nonblocking, no-delay
|
|
|
|
(define (fdes-status fd/port)
|
|
(sleazy-call/fdes fd/port
|
|
(lambda (fd) (%fcntl-read fd fcntl/get-status-flags))))
|
|
|
|
(define (set-fdes-status fd/port flags)
|
|
(sleazy-call/fdes fd/port
|
|
(lambda (fd) (%fcntl-write fd fcntl/set-status-flags flags))))
|
|
|
|
;;; Miscellaneous
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
;;; usleep(3): Try to sleep for USECS microseconds.
|
|
;;; sleep(3): Try to sleep for SECS seconds.
|
|
|
|
; De-released -- not POSIX and not on SGI systems.
|
|
; (define-foreign usleep (usleep (integer usecs)) integer)
|
|
|
|
(define (process-sleep secs) (process-sleep-until (+ secs (time))))
|
|
|
|
(define (process-sleep-until when)
|
|
(let* ((when (floor when)) ; Painful to do real->int in Scheme.
|
|
(when (if (exact? when) when (inexact->exact when))))
|
|
(let lp ()
|
|
(or (%sleep-until when) (lp)))))
|
|
|
|
(import-os-error-syscall %sleep-until (secs) "sleep_until")
|
|
|
|
(import-os-error-syscall %gethostname () "scm_gethostname")
|
|
|
|
(define system-name %gethostname)
|
|
|
|
(import-os-error-syscall errno-msg (i) "errno_msg")
|
|
|
|
(import-os-error-syscall %crypt (key salt) "scm_crypt")
|
|
|
|
(define (crypt key salt)
|
|
(let* ((allowed-char-set (rx (| alpha digit "." "/")))
|
|
(salt-regexp (rx (: ,allowed-char-set ,allowed-char-set))))
|
|
(if (not (= (string-length salt) 2)) (error "salt must have length 2"))
|
|
(if (not (regexp-search? salt-regexp salt))
|
|
(error "illegal char in salt " salt))
|
|
(if (> (string-length key) 8) (error "key too long " (string-length key)))
|
|
(%crypt key salt)))
|