Closed
Description
What version of Go are you using (go version
)?
$ go version go version go1.16.2 darwin/amd64
Does this issue reproduce with the latest release?
Yes.
What operating system and processor architecture are you using (go env
)?
go env
Output
$ go env GO111MODULE="" GOARCH="amd64" GOBIN="" GOCACHE="/Users/user/Library/Caches/go-build" GOENV="/Users/user/Library/Application Support/go/env" GOEXE="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="darwin" GOINSECURE="" GOMODCACHE="/Users/user/go/pkg/mod" GONOPROXY="" GONOSUMDB="" GOOS="darwin" GOPATH="/Users/user/go/" GOPRIVATE="" GOPROXY="https://proxy.golang.org,direct" GOROOT="/usr/local/Cellar/go/1.16.2/libexec" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/usr/local/Cellar/go/1.16.2/libexec/pkg/tool/darwin_amd64" GOVCS="" GOVERSION="go1.16.2" GCCGO="gccgo" AR="ar" CC="clang" CXX="clang++" CGO_ENABLED="1" GOMOD="/Users/user/git/gitlab.corp.mail.ru/mayday/payday/worker-service/go.mod" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/85/w4vtlcwn7qvccncnft_b1z1w0000gp/T/go-build752161639=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
package main
import (
"crypto/rand"
"fmt"
)
func main() {
for i := 1; i <= 10000; i++ {
n, err := rand.Reader.Read(make([]byte, 10))
if n != 10 && err == nil {
fmt.Printf("expected n=10, actial n=%d on i=%d", n, i)
return
}
}
fmt.Printf("ok")
}
What did you expect to see?
ok
What did you see instead?
expected n=10, actial n=6 on i=410
More info
Docs say nothing about this.
On Unix machine I get ok
.
Seems that macOS uses some buffer limited with 4096 bytes. Is it an expected behaviour?