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syscall_linux_test.go
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syscall_linux_test.go
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// Copyright 2016 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.
// +build linux
package unix_test
import (
"bufio"
"bytes"
"errors"
"fmt"
"io/ioutil"
"os"
"runtime"
"runtime/debug"
"strconv"
"strings"
"testing"
"time"
"golang.org/x/sys/unix"
)
func TestIoctlGetInt(t *testing.T) {
f, err := os.Open("/dev/random")
if err != nil {
t.Fatalf("failed to open device: %v", err)
}
defer f.Close()
v, err := unix.IoctlGetInt(int(f.Fd()), unix.RNDGETENTCNT)
if err != nil {
t.Fatalf("failed to perform ioctl: %v", err)
}
t.Logf("%d bits of entropy available", v)
}
func TestIoctlRetInt(t *testing.T) {
f, err := os.Open("/proc/self/ns/mnt")
if err != nil {
t.Skipf("skipping test, %v", err)
}
defer f.Close()
v, err := unix.IoctlRetInt(int(f.Fd()), unix.NS_GET_NSTYPE)
if err != nil {
if err == unix.ENOTTY {
t.Skipf("old kernel? (need Linux >= 4.11)")
}
t.Fatalf("failed to perform ioctl: %v", err)
}
if v != unix.CLONE_NEWNS {
t.Fatalf("unexpected return from ioctl; expected %v, got %v", v, unix.CLONE_NEWNS)
}
}
func TestIoctlGetRTCTime(t *testing.T) {
f, err := os.Open("/dev/rtc0")
if err != nil {
t.Skipf("skipping test, %v", err)
}
defer f.Close()
v, err := unix.IoctlGetRTCTime(int(f.Fd()))
if err != nil {
t.Fatalf("failed to perform ioctl: %v", err)
}
t.Logf("RTC time: %04d-%02d-%02d %02d:%02d:%02d", v.Year+1900, v.Mon+1, v.Mday, v.Hour, v.Min, v.Sec)
}
func TestPpoll(t *testing.T) {
if runtime.GOOS == "android" {
t.Skip("mkfifo syscall is not available on android, skipping test")
}
defer chtmpdir(t)()
f, cleanup := mktmpfifo(t)
defer cleanup()
const timeout = 100 * time.Millisecond
ok := make(chan bool, 1)
go func() {
select {
case <-time.After(10 * timeout):
t.Errorf("Ppoll: failed to timeout after %d", 10*timeout)
case <-ok:
}
}()
fds := []unix.PollFd{{Fd: int32(f.Fd()), Events: unix.POLLIN}}
timeoutTs := unix.NsecToTimespec(int64(timeout))
n, err := unix.Ppoll(fds, &timeoutTs, nil)
ok <- true
if err != nil {
t.Errorf("Ppoll: unexpected error: %v", err)
return
}
if n != 0 {
t.Errorf("Ppoll: wrong number of events: got %v, expected %v", n, 0)
return
}
}
func TestTime(t *testing.T) {
var ut unix.Time_t
ut2, err := unix.Time(&ut)
if err != nil {
t.Fatalf("Time: %v", err)
}
if ut != ut2 {
t.Errorf("Time: return value %v should be equal to argument %v", ut2, ut)
}
var now time.Time
for i := 0; i < 10; i++ {
ut, err = unix.Time(nil)
if err != nil {
t.Fatalf("Time: %v", err)
}
now = time.Now()
diff := int64(ut) - now.Unix()
if -1 <= diff && diff <= 1 {
return
}
}
t.Errorf("Time: return value %v should be nearly equal to time.Now().Unix() %v±1", ut, now.Unix())
}
func TestUtime(t *testing.T) {
defer chtmpdir(t)()
touch(t, "file1")
buf := &unix.Utimbuf{
Modtime: 12345,
}
err := unix.Utime("file1", buf)
if err != nil {
t.Fatalf("Utime: %v", err)
}
fi, err := os.Stat("file1")
if err != nil {
t.Fatal(err)
}
if fi.ModTime().Unix() != 12345 {
t.Errorf("Utime: failed to change modtime: expected %v, got %v", 12345, fi.ModTime().Unix())
}
}
func TestUtimesNanoAt(t *testing.T) {
defer chtmpdir(t)()
symlink := "symlink1"
os.Remove(symlink)
err := os.Symlink("nonexisting", symlink)
if err != nil {
t.Fatal(err)
}
ts := []unix.Timespec{
{Sec: 1111, Nsec: 2222},
{Sec: 3333, Nsec: 4444},
}
err = unix.UtimesNanoAt(unix.AT_FDCWD, symlink, ts, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
t.Fatalf("UtimesNanoAt: %v", err)
}
var st unix.Stat_t
err = unix.Lstat(symlink, &st)
if err != nil {
t.Fatalf("Lstat: %v", err)
}
// Only check Mtim, Atim might not be supported by the underlying filesystem
expected := ts[1]
if st.Mtim.Nsec == 0 {
// Some filesystems only support 1-second time stamp resolution
// and will always set Nsec to 0.
expected.Nsec = 0
}
if st.Mtim != expected {
t.Errorf("UtimesNanoAt: wrong mtime: expected %v, got %v", expected, st.Mtim)
}
}
func TestRlimitAs(t *testing.T) {
// disable GC during to avoid flaky test
defer debug.SetGCPercent(debug.SetGCPercent(-1))
var rlim unix.Rlimit
err := unix.Getrlimit(unix.RLIMIT_AS, &rlim)
if err != nil {
t.Fatalf("Getrlimit: %v", err)
}
var zero unix.Rlimit
if zero == rlim {
t.Fatalf("Getrlimit: got zero value %#v", rlim)
}
set := rlim
set.Cur = uint64(unix.Getpagesize())
err = unix.Setrlimit(unix.RLIMIT_AS, &set)
if err != nil {
t.Fatalf("Setrlimit: set failed: %#v %v", set, err)
}
// RLIMIT_AS was set to the page size, so mmap()'ing twice the page size
// should fail. See 'man 2 getrlimit'.
_, err = unix.Mmap(-1, 0, 2*unix.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE)
if err == nil {
t.Fatal("Mmap: unexpectedly succeeded after setting RLIMIT_AS")
}
err = unix.Setrlimit(unix.RLIMIT_AS, &rlim)
if err != nil {
t.Fatalf("Setrlimit: restore failed: %#v %v", rlim, err)
}
b, err := unix.Mmap(-1, 0, 2*unix.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE)
if err != nil {
t.Fatalf("Mmap: %v", err)
}
err = unix.Munmap(b)
if err != nil {
t.Fatalf("Munmap: %v", err)
}
}
func TestPselect(t *testing.T) {
for {
n, err := unix.Pselect(0, nil, nil, nil, &unix.Timespec{Sec: 0, Nsec: 0}, nil)
if err == unix.EINTR {
t.Logf("Pselect interrupted")
continue
} else if err != nil {
t.Fatalf("Pselect: %v", err)
}
if n != 0 {
t.Fatalf("Pselect: got %v ready file descriptors, expected 0", n)
}
break
}
dur := 2500 * time.Microsecond
ts := unix.NsecToTimespec(int64(dur))
var took time.Duration
for {
start := time.Now()
n, err := unix.Pselect(0, nil, nil, nil, &ts, nil)
took = time.Since(start)
if err == unix.EINTR {
t.Logf("Pselect interrupted after %v", took)
continue
} else if err != nil {
t.Fatalf("Pselect: %v", err)
}
if n != 0 {
t.Fatalf("Pselect: got %v ready file descriptors, expected 0", n)
}
break
}
if took < dur {
t.Errorf("Pselect: timeout should have been at least %v, got %v", dur, took)
}
}
func TestSchedSetaffinity(t *testing.T) {
var newMask unix.CPUSet
newMask.Zero()
if newMask.Count() != 0 {
t.Errorf("CpuZero: didn't zero CPU set: %v", newMask)
}
cpu := 1
newMask.Set(cpu)
if newMask.Count() != 1 || !newMask.IsSet(cpu) {
t.Errorf("CpuSet: didn't set CPU %d in set: %v", cpu, newMask)
}
cpu = 5
newMask.Set(cpu)
if newMask.Count() != 2 || !newMask.IsSet(cpu) {
t.Errorf("CpuSet: didn't set CPU %d in set: %v", cpu, newMask)
}
newMask.Clear(cpu)
if newMask.Count() != 1 || newMask.IsSet(cpu) {
t.Errorf("CpuClr: didn't clear CPU %d in set: %v", cpu, newMask)
}
runtime.LockOSThread()
defer runtime.UnlockOSThread()
var oldMask unix.CPUSet
err := unix.SchedGetaffinity(0, &oldMask)
if err != nil {
t.Fatalf("SchedGetaffinity: %v", err)
}
if runtime.NumCPU() < 2 {
t.Skip("skipping setaffinity tests on single CPU system")
}
if runtime.GOOS == "android" {
t.Skip("skipping setaffinity tests on android")
}
// On a system like ppc64x where some cores can be disabled using ppc64_cpu,
// setaffinity should only be called with enabled cores. The valid cores
// are found from the oldMask, but if none are found then the setaffinity
// tests are skipped. Issue #27875.
cpu = 1
if !oldMask.IsSet(cpu) {
newMask.Zero()
for i := 0; i < len(oldMask); i++ {
if oldMask.IsSet(i) {
newMask.Set(i)
break
}
}
if newMask.Count() == 0 {
t.Skip("skipping setaffinity tests if CPU not available")
}
}
err = unix.SchedSetaffinity(0, &newMask)
if err != nil {
t.Fatalf("SchedSetaffinity: %v", err)
}
var gotMask unix.CPUSet
err = unix.SchedGetaffinity(0, &gotMask)
if err != nil {
t.Fatalf("SchedGetaffinity: %v", err)
}
if gotMask != newMask {
t.Errorf("SchedSetaffinity: returned affinity mask does not match set affinity mask")
}
// Restore old mask so it doesn't affect successive tests
err = unix.SchedSetaffinity(0, &oldMask)
if err != nil {
t.Fatalf("SchedSetaffinity: %v", err)
}
}
func TestStatx(t *testing.T) {
var stx unix.Statx_t
err := unix.Statx(unix.AT_FDCWD, ".", 0, 0, &stx)
if err == unix.ENOSYS || err == unix.EPERM {
t.Skip("statx syscall is not available, skipping test")
} else if err != nil {
t.Fatalf("Statx: %v", err)
}
defer chtmpdir(t)()
touch(t, "file1")
var st unix.Stat_t
err = unix.Stat("file1", &st)
if err != nil {
t.Fatalf("Stat: %v", err)
}
flags := unix.AT_STATX_SYNC_AS_STAT
err = unix.Statx(unix.AT_FDCWD, "file1", flags, unix.STATX_ALL, &stx)
if err != nil {
t.Fatalf("Statx: %v", err)
}
if uint32(stx.Mode) != st.Mode {
t.Errorf("Statx: returned stat mode does not match Stat")
}
ctime := unix.StatxTimestamp{Sec: int64(st.Ctim.Sec), Nsec: uint32(st.Ctim.Nsec)}
mtime := unix.StatxTimestamp{Sec: int64(st.Mtim.Sec), Nsec: uint32(st.Mtim.Nsec)}
if stx.Ctime != ctime {
t.Errorf("Statx: returned stat ctime does not match Stat")
}
if stx.Mtime != mtime {
t.Errorf("Statx: returned stat mtime does not match Stat")
}
err = os.Symlink("file1", "symlink1")
if err != nil {
t.Fatal(err)
}
err = unix.Lstat("symlink1", &st)
if err != nil {
t.Fatalf("Lstat: %v", err)
}
err = unix.Statx(unix.AT_FDCWD, "symlink1", flags, unix.STATX_BASIC_STATS, &stx)
if err != nil {
t.Fatalf("Statx: %v", err)
}
// follow symlink, expect a regulat file
if stx.Mode&unix.S_IFREG == 0 {
t.Errorf("Statx: didn't follow symlink")
}
err = unix.Statx(unix.AT_FDCWD, "symlink1", flags|unix.AT_SYMLINK_NOFOLLOW, unix.STATX_ALL, &stx)
if err != nil {
t.Fatalf("Statx: %v", err)
}
// follow symlink, expect a symlink
if stx.Mode&unix.S_IFLNK == 0 {
t.Errorf("Statx: unexpectedly followed symlink")
}
if uint32(stx.Mode) != st.Mode {
t.Errorf("Statx: returned stat mode does not match Lstat")
}
ctime = unix.StatxTimestamp{Sec: int64(st.Ctim.Sec), Nsec: uint32(st.Ctim.Nsec)}
mtime = unix.StatxTimestamp{Sec: int64(st.Mtim.Sec), Nsec: uint32(st.Mtim.Nsec)}
if stx.Ctime != ctime {
t.Errorf("Statx: returned stat ctime does not match Lstat")
}
if stx.Mtime != mtime {
t.Errorf("Statx: returned stat mtime does not match Lstat")
}
}
// stringsFromByteSlice converts a sequence of attributes to a []string.
// On Linux, each entry is a NULL-terminated string.
func stringsFromByteSlice(buf []byte) []string {
var result []string
off := 0
for i, b := range buf {
if b == 0 {
result = append(result, string(buf[off:i]))
off = i + 1
}
}
return result
}
func TestFaccessat(t *testing.T) {
defer chtmpdir(t)()
touch(t, "file1")
err := unix.Faccessat(unix.AT_FDCWD, "file1", unix.R_OK, 0)
if err != nil {
t.Errorf("Faccessat: unexpected error: %v", err)
}
err = unix.Faccessat(unix.AT_FDCWD, "file1", unix.R_OK, 2)
if err != unix.EINVAL {
t.Errorf("Faccessat: unexpected error: %v, want EINVAL", err)
}
err = unix.Faccessat(unix.AT_FDCWD, "file1", unix.R_OK, unix.AT_EACCESS)
if err != nil {
t.Errorf("Faccessat: unexpected error: %v", err)
}
err = os.Symlink("file1", "symlink1")
if err != nil {
t.Fatal(err)
}
err = unix.Faccessat(unix.AT_FDCWD, "symlink1", unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
t.Errorf("Faccessat SYMLINK_NOFOLLOW: unexpected error %v", err)
}
// We can't really test AT_SYMLINK_NOFOLLOW, because there
// doesn't seem to be any way to change the mode of a symlink.
// We don't test AT_EACCESS because such tests are only
// meaningful if run as root.
err = unix.Fchmodat(unix.AT_FDCWD, "file1", 0, 0)
if err != nil {
t.Errorf("Fchmodat: unexpected error %v", err)
}
err = unix.Faccessat(unix.AT_FDCWD, "file1", unix.F_OK, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
t.Errorf("Faccessat: unexpected error: %v", err)
}
err = unix.Faccessat(unix.AT_FDCWD, "file1", unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
if err != unix.EACCES {
if unix.Getuid() != 0 {
t.Errorf("Faccessat: unexpected error: %v, want EACCES", err)
}
}
}
func TestSyncFileRange(t *testing.T) {
file, err := ioutil.TempFile("", "TestSyncFileRange")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file.Name())
defer file.Close()
err = unix.SyncFileRange(int(file.Fd()), 0, 0, 0)
if err == unix.ENOSYS || err == unix.EPERM {
t.Skip("sync_file_range syscall is not available, skipping test")
} else if err != nil {
t.Fatalf("SyncFileRange: %v", err)
}
// invalid flags
flags := 0xf00
err = unix.SyncFileRange(int(file.Fd()), 0, 0, flags)
if err != unix.EINVAL {
t.Fatalf("SyncFileRange: unexpected error: %v, want EINVAL", err)
}
}
func TestClockNanosleep(t *testing.T) {
delay := 50 * time.Millisecond
// Relative timespec.
start := time.Now()
rel := unix.NsecToTimespec(delay.Nanoseconds())
remain := unix.Timespec{}
for {
err := unix.ClockNanosleep(unix.CLOCK_MONOTONIC, 0, &rel, &remain)
if err == unix.ENOSYS || err == unix.EPERM {
t.Skip("clock_nanosleep syscall is not available, skipping test")
} else if err == unix.EINTR {
t.Logf("ClockNanosleep interrupted after %v", time.Since(start))
rel = remain
continue
} else if err != nil {
t.Errorf("ClockNanosleep(CLOCK_MONOTONIC, 0, %#v, nil) = %v", &rel, err)
} else if slept := time.Since(start); slept < delay {
t.Errorf("ClockNanosleep(CLOCK_MONOTONIC, 0, %#v, nil) slept only %v", &rel, slept)
}
break
}
// Absolute timespec.
for {
start = time.Now()
until := start.Add(delay)
abs := unix.NsecToTimespec(until.UnixNano())
err := unix.ClockNanosleep(unix.CLOCK_REALTIME, unix.TIMER_ABSTIME, &abs, nil)
if err == unix.EINTR {
t.Logf("ClockNanosleep interrupted after %v", time.Since(start))
continue
} else if err != nil {
t.Errorf("ClockNanosleep(CLOCK_REALTIME, TIMER_ABSTIME, %#v (=%v), nil) = %v", &abs, until, err)
} else if slept := time.Since(start); slept < delay {
t.Errorf("ClockNanosleep(CLOCK_REALTIME, TIMER_ABSTIME, %#v (=%v), nil) slept only %v", &abs, until, slept)
}
break
}
// Invalid clock. clock_nanosleep(2) says EINVAL, but it’s actually EOPNOTSUPP.
err := unix.ClockNanosleep(unix.CLOCK_THREAD_CPUTIME_ID, 0, &rel, nil)
if err != unix.EINVAL && err != unix.EOPNOTSUPP {
t.Errorf("ClockNanosleep(CLOCK_THREAD_CPUTIME_ID, 0, %#v, nil) = %v, want EINVAL or EOPNOTSUPP", &rel, err)
}
}
func TestOpenByHandleAt(t *testing.T) {
skipIfNotSupported := func(t *testing.T, name string, err error) {
if err == unix.EPERM {
t.Skipf("skipping %s test without CAP_DAC_READ_SEARCH", name)
}
if err == unix.ENOSYS {
t.Skipf("%s system call not available", name)
}
if err == unix.EOPNOTSUPP {
t.Skipf("%s not supported on this filesystem", name)
}
}
h, mountID, err := unix.NameToHandleAt(unix.AT_FDCWD, "syscall_linux_test.go", 0)
if err != nil {
skipIfNotSupported(t, "name_to_handle_at", err)
t.Fatalf("NameToHandleAt: %v", err)
}
t.Logf("mountID: %v, handle: size=%d, type=%d, bytes=%q", mountID,
h.Size(), h.Type(), h.Bytes())
mount, err := openMountByID(mountID)
if err != nil {
t.Fatalf("openMountByID: %v", err)
}
defer mount.Close()
for _, clone := range []bool{false, true} {
t.Run("clone="+strconv.FormatBool(clone), func(t *testing.T) {
if clone {
h = unix.NewFileHandle(h.Type(), h.Bytes())
}
fd, err := unix.OpenByHandleAt(int(mount.Fd()), h, unix.O_RDONLY)
skipIfNotSupported(t, "open_by_handle_at", err)
if err != nil {
t.Fatalf("OpenByHandleAt: %v", err)
}
defer unix.Close(fd)
t.Logf("opened fd %v", fd)
f := os.NewFile(uintptr(fd), "")
slurp, err := ioutil.ReadAll(f)
if err != nil {
t.Fatal(err)
}
const substr = "Some substring for a test."
if !strings.Contains(string(slurp), substr) {
t.Errorf("didn't find substring %q in opened file; read %d bytes", substr, len(slurp))
}
})
}
}
func openMountByID(mountID int) (f *os.File, err error) {
mi, err := os.Open("/proc/self/mountinfo")
if err != nil {
return nil, err
}
defer mi.Close()
bs := bufio.NewScanner(mi)
wantPrefix := []byte(fmt.Sprintf("%v ", mountID))
for bs.Scan() {
if !bytes.HasPrefix(bs.Bytes(), wantPrefix) {
continue
}
fields := strings.Fields(bs.Text())
dev := fields[4]
return os.Open(dev)
}
if err := bs.Err(); err != nil {
return nil, err
}
return nil, errors.New("mountID not found")
}
func TestEpoll(t *testing.T) {
efd, err := unix.EpollCreate1(unix.EPOLL_CLOEXEC)
if err != nil {
t.Fatalf("EpollCreate1: %v", err)
}
defer unix.Close(efd)
r, w, err := os.Pipe()
if err != nil {
t.Fatal(err)
}
defer r.Close()
defer w.Close()
fd := int(r.Fd())
ev := unix.EpollEvent{Events: unix.EPOLLIN, Fd: int32(fd)}
err = unix.EpollCtl(efd, unix.EPOLL_CTL_ADD, fd, &ev)
if err != nil {
t.Fatalf("EpollCtl: %v", err)
}
if _, err := w.Write([]byte("HELLO GOPHER")); err != nil {
t.Fatal(err)
}
events := make([]unix.EpollEvent, 128)
n, err := unix.EpollWait(efd, events, 1)
if err != nil {
t.Fatalf("EpollWait: %v", err)
}
if n != 1 {
t.Errorf("EpollWait: wrong number of events: got %v, expected 1", n)
}
got := int(events[0].Fd)
if got != fd {
t.Errorf("EpollWait: wrong Fd in event: got %v, expected %v", got, fd)
}
}
func TestPrctlRetInt(t *testing.T) {
err := unix.Prctl(unix.PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)
if err != nil {
t.Skipf("Prctl: %v, skipping test", err)
}
v, err := unix.PrctlRetInt(unix.PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0)
if err != nil {
t.Fatalf("failed to perform prctl: %v", err)
}
if v != 1 {
t.Fatalf("unexpected return from prctl; got %v, expected %v", v, 1)
}
}