mirror of
https://github.com/autc04/Retro68.git
synced 2024-08-31 09:29:37 +00:00
643 lines
20 KiB
Go
643 lines
20 KiB
Go
// Copyright 2015 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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package syscall_test
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import (
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"fmt"
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"io"
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"io/fs"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"sort"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"testing"
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"unsafe"
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)
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// chtmpdir changes the working directory to a new temporary directory and
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// provides a cleanup function. Used when PWD is read-only.
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func chtmpdir(t *testing.T) func() {
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oldwd, err := os.Getwd()
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if err != nil {
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t.Fatalf("chtmpdir: %v", err)
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}
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d, err := os.MkdirTemp("", "test")
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if err != nil {
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t.Fatalf("chtmpdir: %v", err)
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}
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if err := os.Chdir(d); err != nil {
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t.Fatalf("chtmpdir: %v", err)
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}
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return func() {
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if err := os.Chdir(oldwd); err != nil {
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t.Fatalf("chtmpdir: %v", err)
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}
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os.RemoveAll(d)
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}
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}
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func touch(t *testing.T, name string) {
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f, err := os.Create(name)
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if err != nil {
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t.Fatal(err)
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}
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if err := f.Close(); err != nil {
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t.Fatal(err)
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}
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}
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const (
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_AT_SYMLINK_NOFOLLOW = 0x100
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_AT_FDCWD = -0x64
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_AT_EACCESS = 0x200
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_F_OK = 0
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_R_OK = 4
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)
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func TestFaccessat(t *testing.T) {
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defer chtmpdir(t)()
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touch(t, "file1")
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err := syscall.Faccessat(_AT_FDCWD, "file1", _R_OK, 0)
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if err != nil {
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t.Errorf("Faccessat: unexpected error: %v", err)
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}
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err = syscall.Faccessat(_AT_FDCWD, "file1", _R_OK, 2)
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if err != syscall.EINVAL {
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t.Errorf("Faccessat: unexpected error: %v, want EINVAL", err)
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}
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err = syscall.Faccessat(_AT_FDCWD, "file1", _R_OK, _AT_EACCESS)
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if err != nil {
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t.Errorf("Faccessat: unexpected error: %v", err)
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}
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err = os.Symlink("file1", "symlink1")
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if err != nil {
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t.Fatal(err)
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}
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err = syscall.Faccessat(_AT_FDCWD, "symlink1", _R_OK, _AT_SYMLINK_NOFOLLOW)
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if err != nil {
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t.Errorf("Faccessat SYMLINK_NOFOLLOW: unexpected error %v", err)
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}
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// We can't really test _AT_SYMLINK_NOFOLLOW, because there
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// doesn't seem to be any way to change the mode of a symlink.
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// We don't test _AT_EACCESS because such tests are only
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// meaningful if run as root.
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err = syscall.Fchmodat(_AT_FDCWD, "file1", 0, 0)
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if err != nil {
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t.Errorf("Fchmodat: unexpected error %v", err)
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}
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err = syscall.Faccessat(_AT_FDCWD, "file1", _F_OK, _AT_SYMLINK_NOFOLLOW)
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if err != nil {
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t.Errorf("Faccessat: unexpected error: %v", err)
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}
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err = syscall.Faccessat(_AT_FDCWD, "file1", _R_OK, _AT_SYMLINK_NOFOLLOW)
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if err != syscall.EACCES {
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if syscall.Getuid() != 0 {
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t.Errorf("Faccessat: unexpected error: %v, want EACCES", err)
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}
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}
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}
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func TestFchmodat(t *testing.T) {
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defer chtmpdir(t)()
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touch(t, "file1")
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os.Symlink("file1", "symlink1")
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err := syscall.Fchmodat(_AT_FDCWD, "symlink1", 0444, 0)
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if err != nil {
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t.Fatalf("Fchmodat: unexpected error: %v", err)
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}
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fi, err := os.Stat("file1")
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if err != nil {
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t.Fatal(err)
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}
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if fi.Mode() != 0444 {
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t.Errorf("Fchmodat: failed to change mode: expected %v, got %v", 0444, fi.Mode())
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}
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err = syscall.Fchmodat(_AT_FDCWD, "symlink1", 0444, _AT_SYMLINK_NOFOLLOW)
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if err != syscall.EOPNOTSUPP {
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t.Fatalf("Fchmodat: unexpected error: %v, expected EOPNOTSUPP", err)
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}
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}
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func TestMain(m *testing.M) {
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if os.Getenv("GO_DEATHSIG_PARENT") == "1" {
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deathSignalParent()
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} else if os.Getenv("GO_DEATHSIG_CHILD") == "1" {
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deathSignalChild()
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} else if os.Getenv("GO_SYSCALL_NOERROR") == "1" {
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syscallNoError()
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}
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os.Exit(m.Run())
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}
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func TestParseNetlinkMessage(t *testing.T) {
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for i, b := range [][]byte{
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{103, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 11, 0, 1, 0, 0, 0, 0, 5, 8, 0, 3,
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0, 8, 0, 6, 0, 0, 0, 0, 1, 63, 0, 10, 0, 69, 16, 0, 59, 39, 82, 64, 0, 64, 6, 21, 89, 127, 0, 0,
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1, 127, 0, 0, 1, 230, 228, 31, 144, 32, 186, 155, 211, 185, 151, 209, 179, 128, 24, 1, 86,
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53, 119, 0, 0, 1, 1, 8, 10, 0, 17, 234, 12, 0, 17, 189, 126, 107, 106, 108, 107, 106, 13, 10,
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},
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{106, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 11, 0, 1, 0, 0, 0, 0, 3, 8, 0, 3,
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0, 8, 0, 6, 0, 0, 0, 0, 1, 66, 0, 10, 0, 69, 0, 0, 62, 230, 255, 64, 0, 64, 6, 85, 184, 127, 0, 0,
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1, 127, 0, 0, 1, 237, 206, 31, 144, 73, 197, 128, 65, 250, 60, 192, 97, 128, 24, 1, 86, 253, 21, 0,
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0, 1, 1, 8, 10, 0, 51, 106, 89, 0, 51, 102, 198, 108, 104, 106, 108, 107, 104, 108, 107, 104, 10,
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},
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{102, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 2, 11, 0, 1, 0, 0, 0, 0, 1, 8, 0, 3, 0,
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8, 0, 6, 0, 0, 0, 0, 1, 62, 0, 10, 0, 69, 0, 0, 58, 231, 2, 64, 0, 64, 6, 85, 185, 127, 0, 0, 1, 127,
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0, 0, 1, 237, 206, 31, 144, 73, 197, 128, 86, 250, 60, 192, 97, 128, 24, 1, 86, 104, 64, 0, 0, 1, 1, 8,
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10, 0, 52, 198, 200, 0, 51, 135, 232, 101, 115, 97, 103, 103, 10,
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},
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} {
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m, err := syscall.ParseNetlinkMessage(b)
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if err != syscall.EINVAL {
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t.Errorf("#%d: got %v; want EINVAL", i, err)
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}
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if m != nil {
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t.Errorf("#%d: got %v; want nil", i, m)
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}
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}
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}
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func TestSyscallNoError(t *testing.T) {
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// On Linux there are currently no syscalls which don't fail and return
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// a value larger than 0xfffffffffffff001 so we could test RawSyscall
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// vs. RawSyscallNoError on 64bit architectures.
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if unsafe.Sizeof(uintptr(0)) != 4 {
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t.Skip("skipping on non-32bit architecture")
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}
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// See https://golang.org/issue/35422
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// On MIPS, Linux returns whether the syscall had an error in a separate
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// register (R7), not using a negative return value as on other
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// architectures.
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if runtime.GOARCH == "mips" || runtime.GOARCH == "mipsle" {
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t.Skipf("skipping on %s", runtime.GOARCH)
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}
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if os.Getuid() != 0 {
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t.Skip("skipping root only test")
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}
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if syscall.Sys_GETEUID == 0 {
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t.Skip("skipping because there is no geteuid system call")
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}
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if runtime.GOOS == "android" {
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t.Skip("skipping on rooted android, see issue 27364")
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}
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// Copy the test binary to a location that a non-root user can read/execute
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// after we drop privileges
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tempDir, err := os.MkdirTemp("", "TestSyscallNoError")
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if err != nil {
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t.Fatalf("cannot create temporary directory: %v", err)
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}
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defer os.RemoveAll(tempDir)
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os.Chmod(tempDir, 0755)
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tmpBinary := filepath.Join(tempDir, filepath.Base(os.Args[0]))
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src, err := os.Open(os.Args[0])
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if err != nil {
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t.Fatalf("cannot open binary %q, %v", os.Args[0], err)
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}
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defer src.Close()
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dst, err := os.OpenFile(tmpBinary, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
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if err != nil {
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t.Fatalf("cannot create temporary binary %q, %v", tmpBinary, err)
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}
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if _, err := io.Copy(dst, src); err != nil {
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t.Fatalf("failed to copy test binary to %q, %v", tmpBinary, err)
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}
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err = dst.Close()
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if err != nil {
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t.Fatalf("failed to close test binary %q, %v", tmpBinary, err)
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}
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uid := uint32(0xfffffffe)
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err = os.Chown(tmpBinary, int(uid), -1)
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if err != nil {
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t.Fatalf("failed to chown test binary %q, %v", tmpBinary, err)
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}
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err = os.Chmod(tmpBinary, 0755|fs.ModeSetuid)
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if err != nil {
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t.Fatalf("failed to set setuid bit on test binary %q, %v", tmpBinary, err)
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}
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cmd := exec.Command(tmpBinary)
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cmd.Env = append(os.Environ(), "GO_SYSCALL_NOERROR=1")
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("failed to start first child process: %v", err)
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}
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got := strings.TrimSpace(string(out))
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want := strconv.FormatUint(uint64(uid)+1, 10) + " / " +
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strconv.FormatUint(uint64(-uid), 10) + " / " +
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strconv.FormatUint(uint64(uid), 10)
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if got != want {
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if filesystemIsNoSUID(tmpBinary) {
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t.Skip("skipping test when temp dir is mounted nosuid")
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}
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// formatted so the values are aligned for easier comparison
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t.Errorf("expected %s,\ngot %s", want, got)
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}
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}
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// filesystemIsNoSUID reports whether the filesystem for the given
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// path is mounted nosuid.
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func filesystemIsNoSUID(path string) bool {
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var st syscall.Statfs_t
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if syscall.Statfs(path, &st) != nil {
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return false
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}
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return st.Flags&syscall.MS_NOSUID != 0
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}
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func syscallNoError() {
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// Test that the return value from SYS_GETEUID32 (which cannot fail)
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// doesn't get treated as an error (see https://golang.org/issue/22924)
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euid1, _, e := syscall.RawSyscall(syscall.Sys_GETEUID, 0, 0, 0)
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euid2, _ := syscall.RawSyscallNoError(syscall.Sys_GETEUID, 0, 0, 0)
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fmt.Println(uintptr(euid1), "/", int(e), "/", uintptr(euid2))
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os.Exit(0)
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}
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// reference uapi/linux/prctl.h
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const (
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PR_GET_KEEPCAPS uintptr = 7
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PR_SET_KEEPCAPS = 8
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)
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// TestAllThreadsSyscall tests that the go runtime can perform
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// syscalls that execute on all OSThreads - with which to support
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// POSIX semantics for security state changes.
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func TestAllThreadsSyscall(t *testing.T) {
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if _, _, err := syscall.AllThreadsSyscall(syscall.SYS_PRCTL, PR_SET_KEEPCAPS, 0, 0); err == syscall.ENOTSUP {
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t.Skip("AllThreadsSyscall disabled with cgo")
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}
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fns := []struct {
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label string
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fn func(uintptr) error
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}{
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{
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label: "prctl<3-args>",
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fn: func(v uintptr) error {
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_, _, e := syscall.AllThreadsSyscall(syscall.SYS_PRCTL, PR_SET_KEEPCAPS, v, 0)
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if e != 0 {
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return e
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}
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return nil
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},
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},
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{
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label: "prctl<6-args>",
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fn: func(v uintptr) error {
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_, _, e := syscall.AllThreadsSyscall6(syscall.SYS_PRCTL, PR_SET_KEEPCAPS, v, 0, 0, 0, 0)
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if e != 0 {
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return e
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}
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return nil
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},
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},
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}
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waiter := func(q <-chan uintptr, r chan<- uintptr, once bool) {
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for x := range q {
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runtime.LockOSThread()
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v, _, e := syscall.Syscall(syscall.SYS_PRCTL, PR_GET_KEEPCAPS, 0, 0)
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if e != 0 {
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t.Errorf("tid=%d prctl(PR_GET_KEEPCAPS) failed: %v", syscall.Gettid(), e)
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} else if x != v {
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t.Errorf("tid=%d prctl(PR_GET_KEEPCAPS) mismatch: got=%d want=%d", syscall.Gettid(), v, x)
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}
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r <- v
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if once {
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break
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}
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runtime.UnlockOSThread()
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}
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}
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// launches per fns member.
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const launches = 11
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question := make(chan uintptr)
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response := make(chan uintptr)
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defer close(question)
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routines := 0
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for i, v := range fns {
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for j := 0; j < launches; j++ {
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// Add another goroutine - the closest thing
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// we can do to encourage more OS thread
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// creation - while the test is running. The
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// actual thread creation may or may not be
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// needed, based on the number of available
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// unlocked OS threads at the time waiter
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// calls runtime.LockOSThread(), but the goal
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// of doing this every time through the loop
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// is to race thread creation with v.fn(want)
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// being executed. Via the once boolean we
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// also encourage one in 5 waiters to return
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// locked after participating in only one
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// question response sequence. This allows the
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// test to race thread destruction too.
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once := routines%5 == 4
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go waiter(question, response, once)
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// Keep a count of how many goroutines are
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// going to participate in the
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// question/response test. This will count up
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// towards 2*launches minus the count of
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// routines that have been invoked with
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// once=true.
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routines++
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// Decide what value we want to set the
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// process-shared KEEPCAPS. Note, there is
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// an explicit repeat of 0 when we change the
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// variant of the syscall being used.
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want := uintptr(j & 1)
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// Invoke the AllThreadsSyscall* variant.
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if err := v.fn(want); err != nil {
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t.Errorf("[%d,%d] %s(PR_SET_KEEPCAPS, %d, ...): %v", i, j, v.label, j&1, err)
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}
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// At this point, we want all launched Go
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// routines to confirm that they see the
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// wanted value for KEEPCAPS.
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for k := 0; k < routines; k++ {
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question <- want
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}
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// At this point, we should have a large
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// number of locked OS threads all wanting to
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// reply.
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for k := 0; k < routines; k++ {
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if got := <-response; got != want {
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t.Errorf("[%d,%d,%d] waiter result got=%d, want=%d", i, j, k, got, want)
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}
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}
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// Provide an explicit opportunity for this Go
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// routine to change Ms.
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runtime.Gosched()
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if once {
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// One waiter routine will have exited.
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routines--
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}
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// Whatever M we are now running on, confirm
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// we see the wanted value too.
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if v, _, e := syscall.Syscall(syscall.SYS_PRCTL, PR_GET_KEEPCAPS, 0, 0); e != 0 {
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t.Errorf("[%d,%d] prctl(PR_GET_KEEPCAPS) failed: %v", i, j, e)
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} else if v != want {
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t.Errorf("[%d,%d] prctl(PR_GET_KEEPCAPS) gave wrong value: got=%v, want=1", i, j, v)
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}
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}
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}
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}
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// compareStatus is used to confirm the contents of the thread
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// specific status files match expectations.
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func compareStatus(filter, expect string) error {
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expected := filter + expect
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pid := syscall.Getpid()
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fs, err := os.ReadDir(fmt.Sprintf("/proc/%d/task", pid))
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if err != nil {
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return fmt.Errorf("unable to find %d tasks: %v", pid, err)
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}
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expectedProc := fmt.Sprintf("Pid:\t%d", pid)
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foundAThread := false
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for _, f := range fs {
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tf := fmt.Sprintf("/proc/%s/status", f.Name())
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d, err := os.ReadFile(tf)
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if err != nil {
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// There are a surprising number of ways this
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// can error out on linux. We've seen all of
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// the following, so treat any error here as
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// equivalent to the "process is gone":
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// os.IsNotExist(err),
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// "... : no such process",
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// "... : bad file descriptor.
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continue
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}
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lines := strings.Split(string(d), "\n")
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for _, line := range lines {
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// Different kernel vintages pad differently.
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line = strings.TrimSpace(line)
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if strings.HasPrefix(line, "Pid:\t") {
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// On loaded systems, it is possible
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// for a TID to be reused really
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// quickly. As such, we need to
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// validate that the thread status
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// info we just read is a task of the
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// same process PID as we are
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// currently running, and not a
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// recently terminated thread
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// resurfaced in a different process.
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if line != expectedProc {
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break
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}
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// Fall through in the unlikely case
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// that filter at some point is
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// "Pid:\t".
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}
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|
if strings.HasPrefix(line, filter) {
|
|
if line == expected {
|
|
foundAThread = true
|
|
break
|
|
}
|
|
if filter == "Groups:" && strings.HasPrefix(line, "Groups:\t") {
|
|
// https://github.com/golang/go/issues/46145
|
|
// Containers don't reliably output this line in sorted order so manually sort and compare that.
|
|
a := strings.Split(line[8:], " ")
|
|
sort.Strings(a)
|
|
got := strings.Join(a, " ")
|
|
if got == expected[8:] {
|
|
foundAThread = true
|
|
break
|
|
}
|
|
|
|
}
|
|
return fmt.Errorf("%q got:%q want:%q (bad) [pid=%d file:'%s' %v]\n", tf, line, expected, pid, string(d), expectedProc)
|
|
}
|
|
}
|
|
}
|
|
if !foundAThread {
|
|
return fmt.Errorf("found no thread /proc/<TID>/status files for process %q", expectedProc)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// killAThread locks the goroutine to an OS thread and exits; this
|
|
// causes an OS thread to terminate.
|
|
func killAThread(c <-chan struct{}) {
|
|
runtime.LockOSThread()
|
|
<-c
|
|
return
|
|
}
|
|
|
|
// TestSetuidEtc performs tests on all of the wrapped system calls
|
|
// that mirror to the 9 glibc syscalls with POSIX semantics. The test
|
|
// here is considered authoritative and should compile and run
|
|
// CGO_ENABLED=0 or 1. Note, there is an extended copy of this same
|
|
// test in ../../misc/cgo/test/issue1435.go which requires
|
|
// CGO_ENABLED=1 and launches pthreads from C that run concurrently
|
|
// with the Go code of the test - and the test validates that these
|
|
// pthreads are also kept in sync with the security state changed with
|
|
// the syscalls. Care should be taken to mirror any enhancements to
|
|
// this test here in that file too.
|
|
func TestSetuidEtc(t *testing.T) {
|
|
if syscall.Getuid() != 0 {
|
|
t.Skip("skipping root only test")
|
|
}
|
|
vs := []struct {
|
|
call string
|
|
fn func() error
|
|
filter, expect string
|
|
}{
|
|
{call: "Setegid(1)", fn: func() error { return syscall.Setegid(1) }, filter: "Gid:", expect: "\t0\t1\t0\t1"},
|
|
{call: "Setegid(0)", fn: func() error { return syscall.Setegid(0) }, filter: "Gid:", expect: "\t0\t0\t0\t0"},
|
|
|
|
{call: "Seteuid(1)", fn: func() error { return syscall.Seteuid(1) }, filter: "Uid:", expect: "\t0\t1\t0\t1"},
|
|
{call: "Setuid(0)", fn: func() error { return syscall.Setuid(0) }, filter: "Uid:", expect: "\t0\t0\t0\t0"},
|
|
|
|
{call: "Setgid(1)", fn: func() error { return syscall.Setgid(1) }, filter: "Gid:", expect: "\t1\t1\t1\t1"},
|
|
{call: "Setgid(0)", fn: func() error { return syscall.Setgid(0) }, filter: "Gid:", expect: "\t0\t0\t0\t0"},
|
|
|
|
{call: "Setgroups([]int{0,1,2,3})", fn: func() error { return syscall.Setgroups([]int{0, 1, 2, 3}) }, filter: "Groups:", expect: "\t0 1 2 3"},
|
|
{call: "Setgroups(nil)", fn: func() error { return syscall.Setgroups(nil) }, filter: "Groups:", expect: ""},
|
|
{call: "Setgroups([]int{0})", fn: func() error { return syscall.Setgroups([]int{0}) }, filter: "Groups:", expect: "\t0"},
|
|
|
|
{call: "Setregid(101,0)", fn: func() error { return syscall.Setregid(101, 0) }, filter: "Gid:", expect: "\t101\t0\t0\t0"},
|
|
{call: "Setregid(0,102)", fn: func() error { return syscall.Setregid(0, 102) }, filter: "Gid:", expect: "\t0\t102\t102\t102"},
|
|
{call: "Setregid(0,0)", fn: func() error { return syscall.Setregid(0, 0) }, filter: "Gid:", expect: "\t0\t0\t0\t0"},
|
|
|
|
{call: "Setreuid(1,0)", fn: func() error { return syscall.Setreuid(1, 0) }, filter: "Uid:", expect: "\t1\t0\t0\t0"},
|
|
{call: "Setreuid(0,2)", fn: func() error { return syscall.Setreuid(0, 2) }, filter: "Uid:", expect: "\t0\t2\t2\t2"},
|
|
{call: "Setreuid(0,0)", fn: func() error { return syscall.Setreuid(0, 0) }, filter: "Uid:", expect: "\t0\t0\t0\t0"},
|
|
|
|
{call: "Setresgid(101,0,102)", fn: func() error { return syscall.Setresgid(101, 0, 102) }, filter: "Gid:", expect: "\t101\t0\t102\t0"},
|
|
{call: "Setresgid(0,102,101)", fn: func() error { return syscall.Setresgid(0, 102, 101) }, filter: "Gid:", expect: "\t0\t102\t101\t102"},
|
|
{call: "Setresgid(0,0,0)", fn: func() error { return syscall.Setresgid(0, 0, 0) }, filter: "Gid:", expect: "\t0\t0\t0\t0"},
|
|
|
|
{call: "Setresuid(1,0,2)", fn: func() error { return syscall.Setresuid(1, 0, 2) }, filter: "Uid:", expect: "\t1\t0\t2\t0"},
|
|
{call: "Setresuid(0,2,1)", fn: func() error { return syscall.Setresuid(0, 2, 1) }, filter: "Uid:", expect: "\t0\t2\t1\t2"},
|
|
{call: "Setresuid(0,0,0)", fn: func() error { return syscall.Setresuid(0, 0, 0) }, filter: "Uid:", expect: "\t0\t0\t0\t0"},
|
|
}
|
|
|
|
for i, v := range vs {
|
|
// Generate some thread churn as we execute the tests.
|
|
c := make(chan struct{})
|
|
go killAThread(c)
|
|
close(c)
|
|
|
|
if err := v.fn(); err != nil {
|
|
t.Errorf("[%d] %q failed: %v", i, v.call, err)
|
|
continue
|
|
}
|
|
if err := compareStatus(v.filter, v.expect); err != nil {
|
|
t.Errorf("[%d] %q comparison: %v", i, v.call, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// TestAllThreadsSyscallError verifies that errors are properly returned when
|
|
// the syscall fails on the original thread.
|
|
func TestAllThreadsSyscallError(t *testing.T) {
|
|
// SYS_CAPGET takes pointers as the first two arguments. Since we pass
|
|
// 0, we expect to get EFAULT back.
|
|
r1, r2, err := syscall.AllThreadsSyscall(syscall.SYS_CAPGET, 0, 0, 0)
|
|
if err == syscall.ENOTSUP {
|
|
t.Skip("AllThreadsSyscall disabled with cgo")
|
|
}
|
|
if err != syscall.EFAULT {
|
|
t.Errorf("AllThreadSyscall(SYS_CAPGET) got %d, %d, %v, want err %v", r1, r2, err, syscall.EFAULT)
|
|
}
|
|
}
|
|
|
|
// TestAllThreadsSyscallBlockedSyscall confirms that AllThreadsSyscall
|
|
// can interrupt threads in long-running system calls. This test will
|
|
// deadlock if this doesn't work correctly.
|
|
func TestAllThreadsSyscallBlockedSyscall(t *testing.T) {
|
|
if _, _, err := syscall.AllThreadsSyscall(syscall.SYS_PRCTL, PR_SET_KEEPCAPS, 0, 0); err == syscall.ENOTSUP {
|
|
t.Skip("AllThreadsSyscall disabled with cgo")
|
|
}
|
|
|
|
rd, wr, err := os.Pipe()
|
|
if err != nil {
|
|
t.Fatalf("unable to obtain a pipe: %v", err)
|
|
}
|
|
|
|
// Perform a blocking read on the pipe.
|
|
var wg sync.WaitGroup
|
|
ready := make(chan bool)
|
|
wg.Add(1)
|
|
go func() {
|
|
data := make([]byte, 1)
|
|
|
|
// To narrow the window we have to wait for this
|
|
// goroutine to block in read, synchronize just before
|
|
// calling read.
|
|
ready <- true
|
|
|
|
// We use syscall.Read directly to avoid the poller.
|
|
// This will return when the write side is closed.
|
|
n, err := syscall.Read(int(rd.Fd()), data)
|
|
if !(n == 0 && err == nil) {
|
|
t.Errorf("expected read to return 0, got %d, %s", n, err)
|
|
}
|
|
|
|
// Clean up rd and also ensure rd stays reachable so
|
|
// it doesn't get closed by GC.
|
|
rd.Close()
|
|
wg.Done()
|
|
}()
|
|
<-ready
|
|
|
|
// Loop here to give the goroutine more time to block in read.
|
|
// Generally this will trigger on the first iteration anyway.
|
|
pid := syscall.Getpid()
|
|
for i := 0; i < 100; i++ {
|
|
if id, _, e := syscall.AllThreadsSyscall(syscall.SYS_GETPID, 0, 0, 0); e != 0 {
|
|
t.Errorf("[%d] getpid failed: %v", i, e)
|
|
} else if int(id) != pid {
|
|
t.Errorf("[%d] getpid got=%d, want=%d", i, id, pid)
|
|
}
|
|
// Provide an explicit opportunity for this goroutine
|
|
// to change Ms.
|
|
runtime.Gosched()
|
|
}
|
|
wr.Close()
|
|
wg.Wait()
|
|
}
|