| Server IP : 185.124.137.49 / Your IP : 216.73.217.6 Web Server : LiteSpeed System : Linux id-dci-web1986.main-hosting.eu 5.14.0-611.26.1.el9_7.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Jan 29 05:24:47 EST 2026 x86_64 User : u686484674 ( 686484674) PHP Version : 8.0.30 Disable Function : system, exec, shell_exec, passthru, mysql_list_dbs, ini_alter, dl, symlink, link, chgrp, leak, popen, apache_child_terminate, virtual, mb_send_mail MySQL : OFF | cURL : ON | WGET : ON | Perl : OFF | Python : OFF | Sudo : OFF | Pkexec : OFF Directory : /proc/self/root/opt/go/pkg/mod/golang.org/x/sys@v0.28.0/unix/ |
Upload File : |
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build (darwin && amd64) || linux || zos
package unix_test
import (
"runtime"
"testing"
"golang.org/x/sys/unix"
)
func TestSysvSharedMemory(t *testing.T) {
// create ipc
id, err := unix.SysvShmGet(unix.IPC_PRIVATE, 1024, unix.IPC_CREAT|unix.IPC_EXCL|0o600)
// ipc isn't implemented on android, should fail
if runtime.GOOS == "android" {
if err != unix.ENOSYS {
t.Fatalf("expected android to fail, but it didn't")
}
return
}
// The kernel may have been built without System V IPC support.
if err == unix.ENOSYS {
t.Skip("shmget not supported")
}
if err != nil {
t.Fatalf("SysvShmGet: %v", err)
}
defer func() {
_, err := unix.SysvShmCtl(id, unix.IPC_RMID, nil)
if err != nil {
t.Errorf("Remove failed: %v", err)
}
}()
// attach
b1, err := unix.SysvShmAttach(id, 0, 0)
if err != nil {
t.Fatalf("Attach: %v", err)
}
if runtime.GOOS == "zos" {
// The minimum shared memory size is no less than units of 1M bytes in z/OS
if len(b1) < 1024 {
t.Fatalf("b1 len = %v, less than 1024", len(b1))
}
} else {
if len(b1) != 1024 {
t.Fatalf("b1 len = %v, want 1024", len(b1))
}
}
b1[42] = 'x'
// attach again
b2, err := unix.SysvShmAttach(id, 0, 0)
if err != nil {
t.Fatalf("Attach: %v", err)
}
if runtime.GOOS == "zos" {
// The returned shared memory aligns with the pagesize.
// If pagesize is not 1024 bytes, the shared memory could be larger
if len(b2) < 1024 {
t.Fatalf("b1 len = %v, less than 1024", len(b2))
}
} else {
if len(b2) != 1024 {
t.Fatalf("b1 len = %v, want 1024", len(b2))
}
}
b2[43] = 'y'
if b2[42] != 'x' || b1[43] != 'y' {
t.Fatalf("shared memory isn't shared")
}
// detach
if err = unix.SysvShmDetach(b2); err != nil {
t.Fatalf("Detach: %v", err)
}
if b1[42] != 'x' || b1[43] != 'y' {
t.Fatalf("shared memory was invalidated")
}
}