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fmt: Fscanf fails to read an integer from a special file #54938

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ghost opened this issue Sep 7, 2022 · 1 comment
Closed

fmt: Fscanf fails to read an integer from a special file #54938

ghost opened this issue Sep 7, 2022 · 1 comment
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@ghost
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ghost commented Sep 7, 2022

What version of Go are you using (go version)?

$ go version
go version go1.19.1 linux/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="/home/xxx/.cache/go-build"
GOENV="/home/xxx/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/xxx/gocode/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/xxx/gocode"
GOPRIVATE=""
GOPROXY="direct"
GOROOT="/home/xxx/go"
GOSUMDB="off"
GOTMPDIR=""
GOTOOLDIR="/home/xxx/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.19.1"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build3607947791=/tmp/go-build -gno-record-gcc-switches"

What did you do?

https://go.dev/play/p/Kodf5klMoFG

What did you expect to see?

cat /proc/sys/fs/pipe-max-size outputs 1048576, so I expected this number.

What did you see instead?

1

When it's a regular file with the same content (the number + a newline), Fscanf works fine (dd if=/proc/sys/fs/pipe-max-size of=pipe-max-size, then use os.Open("pipe-max-size") on line 10.)

ioutil.ReadAll also reads all the data.
@seankhliao
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Duplicate of #29399

@seankhliao seankhliao marked this as a duplicate of #29399 Sep 7, 2022
@seankhliao seankhliao closed this as not planned Won't fix, can't repro, duplicate, stale Sep 7, 2022
@golang golang locked and limited conversation to collaborators Sep 7, 2023
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