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add #:get-lib-dirs and #:fail args to `ffi-lib'

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Not currently used, because an experiment that used the additions
was abandoned, but another use in the future seems likely.
This commit is contained in:
Matthew Flatt 2011-10-04 20:17:54 -06:00
parent 2262cd4424
commit f38e57ff68
2 changed files with 70 additions and 63 deletions
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111
collects/ffi/unsafe.rkt
View File

@ -91,61 +91,62 @@
(provide (protect-out (rename-out [get-ffi-lib ffi-lib]))
ffi-lib? ffi-lib-name)
(define get-ffi-lib
(case-lambda
[(name) (get-ffi-lib name "")]
[(name version/s)
(cond
[(not name) (ffi-lib name)] ; #f => NULL => open this executable
[(not (or (string? name) (path? name)))
(raise-type-error 'ffi-lib "library-name" name)]
[else
;; A possible way that this might be misleading: say that there is a
;; "foo.so" file in the current directory, which refers to some
;; undefined symbol, trying to use this function with "foo.so" will try
;; a dlopen with "foo.so" which isn't found, then it tries a dlopen with
;; "/<curpath>/foo.so" which fails because of the undefined symbol, and
;; since all fails, it will use (ffi-lib "foo.so") to raise the original
;; file-not-found error. This is because the dlopen doesn't provide a
;; way to distinguish different errors (only dlerror, but that's
;; unreliable).
(let* ([versions (if (list? version/s) version/s (list version/s))]
[versions (map (lambda (v)
(if (or (not v) (zero? (string-length v)))
"" (string-append "." v)))
versions)]
[fullpath (lambda (p) (path->complete-path (cleanse-path p)))]
[absolute? (absolute-path? name)]
[name0 (path->string (cleanse-path name))] ; orig name
[names (map (if (regexp-match lib-suffix-re name0) ; name+suffix
(lambda (v) (string-append name0 v))
(lambda (v)
(if suffix-before-version?
(string-append name0 "." lib-suffix v)
(string-append name0 v "." lib-suffix))))
versions)]
[ffi-lib* (lambda (name) (ffi-lib name #t))])
(or ;; try to look in our library paths first
(and (not absolute?)
(ormap (lambda (dir)
;; try good names first, then original
(or (ormap (lambda (name)
(ffi-lib* (build-path dir name)))
names)
(ffi-lib* (build-path dir name0))))
(get-lib-search-dirs)))
;; try a system search
(ormap ffi-lib* names) ; try good names first
(ffi-lib* name0) ; try original
(ormap (lambda (name) ; try relative paths
(and (file-exists? name) (ffi-lib* (fullpath name))))
names)
(and (file-exists? name0) ; relative with original
(ffi-lib* (fullpath name0)))
;; give up: call ffi-lib so it will raise an error
(if (pair? names)
(ffi-lib (car names))
(ffi-lib name0))))])]))
(define (get-ffi-lib name [version/s ""]
#:fail [fail #f]
#:get-lib-dirs [get-lib-dirs get-lib-search-dirs])
(cond
[(not name) (ffi-lib name)] ; #f => NULL => open this executable
[(not (or (string? name) (path? name)))
(raise-type-error 'ffi-lib "library-name" name)]
[else
;; A possible way that this might be misleading: say that there is a
;; "foo.so" file in the current directory, which refers to some
;; undefined symbol, trying to use this function with "foo.so" will try
;; a dlopen with "foo.so" which isn't found, then it tries a dlopen with
;; "/<curpath>/foo.so" which fails because of the undefined symbol, and
;; since all fails, it will use (ffi-lib "foo.so") to raise the original
;; file-not-found error. This is because the dlopen doesn't provide a
;; way to distinguish different errors (only dlerror, but that's
;; unreliable).
(let* ([versions (if (list? version/s) version/s (list version/s))]
[versions (map (lambda (v)
(if (or (not v) (zero? (string-length v)))
"" (string-append "." v)))
versions)]
[fullpath (lambda (p) (path->complete-path (cleanse-path p)))]
[absolute? (absolute-path? name)]
[name0 (path->string (cleanse-path name))] ; orig name
[names (map (if (regexp-match lib-suffix-re name0) ; name+suffix
(lambda (v) (string-append name0 v))
(lambda (v)
(if suffix-before-version?
(string-append name0 "." lib-suffix v)
(string-append name0 v "." lib-suffix))))
versions)]
[ffi-lib* (lambda (name) (ffi-lib name #t))])
(or ;; try to look in our library paths first
(and (not absolute?)
(ormap (lambda (dir)
;; try good names first, then original
(or (ormap (lambda (name)
(ffi-lib* (build-path dir name)))
names)
(ffi-lib* (build-path dir name0))))
(get-lib-dirs)))
;; try a system search
(ormap ffi-lib* names) ; try good names first
(ffi-lib* name0) ; try original
(ormap (lambda (name) ; try relative paths
(and (file-exists? name) (ffi-lib* (fullpath name))))
names)
(and (file-exists? name0) ; relative with original
(ffi-lib* (fullpath name0)))
;; give up: by default, call ffi-lib so it will raise an error
(if fail
(fail)
(if (pair? names)
(ffi-lib (car names))
(ffi-lib name0)))))]))
(define (get-ffi-lib-internal x)
(if (ffi-lib? x) x (get-ffi-lib x)))

22
collects/scribblings/foreign/libs.scrbl
View File

@ -10,14 +10,18 @@ libraries}} or @defterm{@as-index{dynamically loaded libraries}}). The
@defproc[(ffi-lib? [v any/c]) boolean?]{
Returns @racket[#t] if @racket[v] is the result of @racket[ffi-lib],
Returns @racket[#t] if @racket[v] is a @deftech{foreign-library value},
@racket[#f] otherwise.}
@defproc[(ffi-lib [path (or/c path-string? #f)]
[version (or/c string? (listof (or/c string? #f)) #f) #f]) any]{
[version (or/c string? (listof (or/c string? #f)) #f) #f]
[#:get-lib-dirs get-lib-dirs (-> (listof path?)) get-lib-search-dirs]
[#:fail fail (or/c #f (-> any)) #f])
any]{
Returns a foreign-library value. Normally,
Returns a @tech{foreign-library value} or the result of @racket[fail].
Normally,
@itemlist[
@ -49,7 +53,7 @@ process:
@itemlist[
@item{If @racket[path] is not an absolute path, look in each
directory reported by @racket[get-lib-search-dirs]. In each
directory reported by @racket[get-lib-dirs]. In each
directory, try @racket[path] with the first version in
@racket[version], adding a suitable suffix if @racket[path]
does not already end in the suffix, then try the second version
@ -74,7 +78,9 @@ process:
]
If none of the paths succeed, the error is reported from trying the
If none of the paths succeed and @racket[fail] is a function, then
@racket[fail] is called in tail position. If @racket[fail] is
@racket[#f], an error is reported from trying the
first path from the second bullet above or (if @racket[version] is an
empty list) from the third bullet above. A library file may exist but
fail to load for some reason; the eventual error message will
@ -103,9 +109,9 @@ corresponding library.}
any]{
Looks for the given object name @racket[objname] in the given
@racket[lib] library. If @racket[lib] is not a foreign-library value
produced by @racket[ffi-lib], it is converted to one by calling
@racket[ffi-lib]. If @racket[objname] is found in @racket[lib], it is
@racket[lib] library. If @racket[lib] is not a @tech{foreign-library value}
it is converted to one by calling @racket[ffi-lib]. If @racket[objname]
is found in @racket[lib], it is
converted to Racket using the given @racket[type]. Types are described
in @secref["types"]; in particular the @racket[get-ffi-obj] procedure
is most often used with function types created with @racket[_fun].