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zhsj opened this issue Sep 20, 2017 · 7 comments
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syscall, x/sys/unix: Select is not implemented on ppc64le #21946

zhsj opened this issue Sep 20, 2017 · 7 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.10

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@zhsj
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zhsj commented Sep 20, 2017 •
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What version of Go are you using (go version)?

go version go1.9 linux/ppc64le

Does this issue reproduce with the latest release?

yes, with go1.9

What operating system and processor architecture are you using (go env)?

GOARCH="ppc64le"
GOBIN=""
GOEXE=""
GOHOSTARCH="ppc64le"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/debian/go"
GORACE=""
GOROOT="/usr/lib/go-1.9"
GOTOOLDIR="/usr/lib/go-1.9/pkg/tool/linux_ppc64le"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build188776017=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"

What did you do?

package main

import (
        "fmt"
        "syscall"
        "unsafe"
)

var nFdBits = uint(8 * unsafe.Sizeof(syscall.FdSet{}.Bits[0]))

func main() {
        fd := 11
        fs := &syscall.FdSet{}
        fs.Bits[uint(fd)/nFdBits] &= ^(1 << (uint(fd) % nFdBits))
        _, e := syscall.Select(fd+1, fs, nil, nil, &syscall.Timeval{Usec: 1})
        fmt.Println(e)
}

What did you expect to see?

I hope it print <nil> which is the result on amd64.

What did you see instead?

it prints function not implemented

BTW, gccgo works fine.
@mundaym
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mundaym commented Sep 20, 2017 •
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/cc @laboger

It looks like syscall.Select should be using the newselect system call. The runtime package appears to have been modified to work around this, but not the syscall package.

runtime:

#define SYS_select               82     // always return -ENOSYS
#define SYS_newselect           142

@mundaym
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mundaym commented Sep 20, 2017

The x/sys/unix package looks like it is affected as well.

@mundaym mundaym added the NeedsFix The path to resolution is known, but the work has not been done. label Sep 20, 2017
@mundaym mundaym changed the title syscall.Select is not implemented on ppc64le syscall, x/sys/unix: Select is not implemented on ppc64le Sep 20, 2017
@mundaym mundaym added this to the Go1.10 milestone Sep 20, 2017
@laboger
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laboger commented Sep 20, 2017

@ceseo

@ceseo
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ceseo commented Sep 20, 2017

I'll have a fix for this shortly.

@gopherbot
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Change https://golang.org/cl/65090 mentions this issue: syscall: Update syscall.Select to use newselect

@gopherbot
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Change https://golang.org/cl/65091 mentions this issue: unix: update Select to use newselect on ppc64x

gopherbot pushed a commit to golang/sys that referenced this issue Sep 22, 2017
@ceseo @laboger
unix: update Select to use newselect on ppc64x
429f518 
Analog to the runtime package, Select should be using newselect
instead of select. This change addresses this problem and regenerates
zsyscall_linux_* for ppc64 and ppc64le.

Updates golang/go#21946

Change-Id: I7ed5c2490ba2ce556f143f8e8377572ab345f7b8
Reviewed-on: https://go-review.googlesource.com/65091
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
gopherbot pushed a commit that referenced this issue Sep 22, 2017
@ceseo @laboger
syscall: update syscall.Select to use newselect on ppc64x
67a0c78 
Analog to the runtime package, syscall.Select should be using
newselect instead of select. This change addresses this problem and
regenerates zsyscall_linux_* for ppc64 and ppc64le.

Updates #21946

Change-Id: I5dc3bf9e7f0b1172d6cce30ddf3bb1e3c95ec8e9
Reviewed-on: https://go-review.googlesource.com/65090
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
@zhsj
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zhsj commented Sep 24, 2017

So I think the fix is merged and we can close this issue now

@zhsj zhsj closed this as completed Sep 24, 2017
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