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8b5eb68238
They can be close()d explicitly with close-file-descriptor, and will close() on gc, but only explicitly closing the last port on them will close the fileno. Notably needed for network sockets where we open separate input and output ports on the same socket.
34 lines
942 B
Scheme
34 lines
942 B
Scheme
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(define (record? x)
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(is-a? x Object))
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(define (record-rtd x)
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(type-of x))
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(define (rtd-name x) (string->symbol (type-name x)))
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(define (rtd-parent x) (type-parent x))
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(define (rtd-field-names x)
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(list->vector
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(map (lambda (x) (if (pair? x) (cadr x) x)) (type-slots x))))
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(define (rtd-all-field-names x)
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(let lp ((x x) (res '()))
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(let ((res (append (vector->list (rtd-field-names x)) res)))
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(let ((p (type-parent x)))
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(if (type? p)
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(lp p res)
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(list->vector res))))))
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(define (rtd-field-mutable? rtd x)
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(let lp ((ls (type-slots rtd)))
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(cond ((null? ls)
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(let ((p (type-parent rtd)))
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(if (type? p)
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(rtd-field-mutable? p x)
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(error "unknown field" rtd x))))
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((eq? x (car ls)))
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((and (pair? (car ls)) (eq? x (cadr (car ls))))
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(not (eq? 'immutable (caar ls))))
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(else (lp (cdr ls))))))
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