115 lines
3.8 KiB
Scheme
115 lines
3.8 KiB
Scheme
|
|
||
|
|
(library (ikarus posix)
|
||
|
|
(export posix-fork fork waitpid system file-exists? delete-file
|
||
|
|
env environ)
|
||
|
|
(import
|
||
|
|
(except (ikarus)
|
||
|
|
posix-fork fork waitpid system file-exists? delete-file
|
||
|
|
env environ))
|
||
|
|
|
||
|
|
(define posix-fork
|
||
|
|
(lambda ()
|
||
|
|
(foreign-call "ikrt_fork")))
|
||
|
|
|
||
|
|
(define fork
|
||
|
|
(lambda (parent-proc child-proc)
|
||
|
|
(let ([pid (posix-fork)])
|
||
|
|
(cond
|
||
|
|
[(fx= pid 0) (child-proc)]
|
||
|
|
[(fx= pid -1)
|
||
|
|
(error 'fork "failed")]
|
||
|
|
[else (parent-proc pid)]))))
|
||
|
|
|
||
|
|
(define waitpid
|
||
|
|
(lambda (pid)
|
||
|
|
(unless (fixnum? pid)
|
||
|
|
(error 'waitpid "~s is not a fixnum" pid))
|
||
|
|
(foreign-call "ikrt_waitpid" pid)))
|
||
|
|
|
||
|
|
(define system
|
||
|
|
(lambda (x)
|
||
|
|
(unless (string? x)
|
||
|
|
(error 'system "~s is not a string" x))
|
||
|
|
(let ([rv (foreign-call "ik_system" x)])
|
||
|
|
(if (fx= rv -1)
|
||
|
|
(error 'system "failed")
|
||
|
|
rv))))
|
||
|
|
|
||
|
|
(define file-exists?
|
||
|
|
(lambda (x)
|
||
|
|
(unless (string? x)
|
||
|
|
(error 'file-exists? "filename ~s is not a string" x))
|
||
|
|
(let ([v (foreign-call "ikrt_file_exists" x)])
|
||
|
|
(cond
|
||
|
|
[(boolean? v) v]
|
||
|
|
[else
|
||
|
|
(error 'file-exists?
|
||
|
|
(case v
|
||
|
|
[(1) "the path ~s contains a non-directory"]
|
||
|
|
[(2) "the path ~s is too long"]
|
||
|
|
[(3) "the path ~s is not accessible"]
|
||
|
|
[(4) "the path ~s contains too many symbolic links"]
|
||
|
|
[(5) "internal access error while accessing ~s"]
|
||
|
|
[(6) "IO error encountered while accessing ~s"]
|
||
|
|
[else "Unknown error in ~s"])
|
||
|
|
x)]))))
|
||
|
|
|
||
|
|
(define delete-file
|
||
|
|
(lambda (x)
|
||
|
|
(unless (string? x)
|
||
|
|
(error 'delete-file "filename ~s is not a string" x))
|
||
|
|
(let ([v (foreign-call "ikrt_delete_file" x)])
|
||
|
|
(case v
|
||
|
|
[(0) (void)]
|
||
|
|
[else
|
||
|
|
(error 'delete-file
|
||
|
|
(case v
|
||
|
|
[(1) "the path ~s contains a non-directory"]
|
||
|
|
[(2) "the path ~s is too long"]
|
||
|
|
[(3) "the file ~s does not exist"]
|
||
|
|
[(4) "the path ~s is not accessible"]
|
||
|
|
[(5) "the path ~s contains too many symbolic links"]
|
||
|
|
[(6) "you do not have permissions to delete ~s"]
|
||
|
|
[(7) "device ~s is busy"]
|
||
|
|
[(8) "IO error encountered while deleting ~s"]
|
||
|
|
[(9) "~s is in a read-only file system"]
|
||
|
|
[(10) "internal access error while deleting ~s"]
|
||
|
|
[else "Unknown error while deleting ~s"])
|
||
|
|
x)]))))
|
||
|
|
|
||
|
|
(define env
|
||
|
|
(let ()
|
||
|
|
(define env
|
||
|
|
(case-lambda
|
||
|
|
[(key)
|
||
|
|
(if (string? key)
|
||
|
|
(foreign-call "ikrt_getenv" key)
|
||
|
|
(error 'env "the key: ~s is not a string" key))]
|
||
|
|
[(key val) (env key val #t)]
|
||
|
|
[(key val overwrite?)
|
||
|
|
(if (string? key)
|
||
|
|
(if (string? val)
|
||
|
|
(unless (foreign-call "ikrt_setenv" key val overwrite?)
|
||
|
|
(error 'env "failed to set ~s to ~s" key val))
|
||
|
|
(error 'env "the value: ~s is not a string" val))
|
||
|
|
(error 'env "the key: ~s is not a string" key))]))
|
||
|
|
env))
|
||
|
|
|
||
|
|
(define environ
|
||
|
|
(lambda ()
|
||
|
|
(map
|
||
|
|
(lambda (s)
|
||
|
|
(define (loc= s i n)
|
||
|
|
(cond
|
||
|
|
[(fx= i n) i]
|
||
|
|
[(char=? (string-ref s i) #\=) i]
|
||
|
|
[else (loc= s (fx+ i 1) n)]))
|
||
|
|
(let ([n (string-length s)])
|
||
|
|
(let ([i (loc= s 0 n)])
|
||
|
|
(cons (substring s 0 i)
|
||
|
|
(if (fx< (fxadd1 i) n)
|
||
|
|
(substring s (fxadd1 i) n)
|
||
|
|
"")))))
|
||
|
|
(foreign-call "ikrt_environ"))))
|
||
|
|
)
|