mirror of https://go.googlesource.com/go
28 lines
787 B
Go
28 lines
787 B
Go
// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build wasip1
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package rand
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import "syscall"
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func init() {
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Reader = &reader{}
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}
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type reader struct{}
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func (r *reader) Read(b []byte) (int, error) {
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// This uses the wasi_snapshot_preview1 random_get syscall defined in
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// https://github.com/WebAssembly/WASI/blob/23a52736049f4327dd335434851d5dc40ab7cad1/legacy/preview1/docs.md#-random_getbuf-pointeru8-buf_len-size---result-errno.
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// The definition does not explicitly guarantee that the entire buffer will
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// be filled, but this appears to be the case in all runtimes tested.
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err := syscall.RandomGet(b)
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if err != nil {
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return 0, err
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}
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return len(b), nil
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}
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