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f542c8878d
Whether System V IPC is supported is a kernel configuration. For golang/go#48708 Change-Id: Id0d23a5ede5f75f70ca6bb0b8abaec773b6adc74 Reviewed-on: https://go-review.googlesource.com/c/sys/+/353392 Trust: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
80 lines
1.6 KiB
Go
80 lines
1.6 KiB
Go
// Copyright 2021 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 (darwin && amd64) || linux
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// +build darwin,amd64 linux
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package unix_test
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import (
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"runtime"
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"testing"
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"golang.org/x/sys/unix"
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)
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func TestSysvSharedMemory(t *testing.T) {
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// create ipc
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id, err := unix.SysvShmGet(unix.IPC_PRIVATE, 1024, unix.IPC_CREAT|unix.IPC_EXCL|0o600)
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// ipc isn't implemented on android, should fail
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if runtime.GOOS == "android" {
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if err != unix.ENOSYS {
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t.Fatalf("expected android to fail, but it didn't")
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}
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return
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}
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// The kernel may have been built without System V IPC support.
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if err == unix.ENOSYS {
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t.Skip("shmget not supported")
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}
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if err != nil {
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t.Fatalf("SysvShmGet: %v", err)
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}
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defer func() {
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_, err := unix.SysvShmCtl(id, unix.IPC_RMID, nil)
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if err != nil {
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t.Errorf("Remove failed: %v", err)
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}
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}()
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// attach
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b1, err := unix.SysvShmAttach(id, 0, 0)
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if err != nil {
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t.Fatalf("Attach: %v", err)
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}
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if len(b1) != 1024 {
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t.Fatalf("b1 len = %v, want 1024", len(b1))
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}
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b1[42] = 'x'
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// attach again
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b2, err := unix.SysvShmAttach(id, 0, 0)
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if err != nil {
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t.Fatalf("Attach: %v", err)
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}
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if len(b2) != 1024 {
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t.Fatalf("b2 len = %v, want 1024", len(b1))
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}
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b2[43] = 'y'
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if b2[42] != 'x' || b1[43] != 'y' {
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t.Fatalf("shared memory isn't shared")
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}
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// detach
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if err = unix.SysvShmDetach(b2); err != nil {
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t.Fatalf("Detach: %v", err)
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}
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if b1[42] != 'x' || b1[43] != 'y' {
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t.Fatalf("shared memory was invalidated")
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}
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}
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