2015-08-28 15:33:40 +00:00
|
|
|
// Copyright 2013 The Go Authors. All rights reserved.
|
2014-09-21 17:33:12 +00:00
|
|
|
// Use of this source code is governed by a BSD-style
|
|
|
|
// license that can be found in the LICENSE file.
|
|
|
|
|
2015-08-28 15:33:40 +00:00
|
|
|
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
|
2014-09-21 17:33:12 +00:00
|
|
|
|
|
|
|
package syscall_test
|
|
|
|
|
|
|
|
import (
|
|
|
|
"flag"
|
|
|
|
"fmt"
|
2017-04-10 11:32:00 +00:00
|
|
|
"internal/testenv"
|
2017-10-07 00:16:47 +00:00
|
|
|
"io"
|
2014-09-21 17:33:12 +00:00
|
|
|
"io/ioutil"
|
|
|
|
"net"
|
|
|
|
"os"
|
|
|
|
"os/exec"
|
2015-08-28 15:33:40 +00:00
|
|
|
"path/filepath"
|
2014-09-21 17:33:12 +00:00
|
|
|
"runtime"
|
|
|
|
"syscall"
|
|
|
|
"testing"
|
|
|
|
"time"
|
|
|
|
)
|
|
|
|
|
2015-08-28 15:33:40 +00:00
|
|
|
// Tests that below functions, structures and constants are consistent
|
|
|
|
// on all Unix-like systems.
|
|
|
|
func _() {
|
|
|
|
// program scheduling priority functions and constants
|
|
|
|
var (
|
|
|
|
_ func(int, int, int) error = syscall.Setpriority
|
|
|
|
_ func(int, int) (int, error) = syscall.Getpriority
|
|
|
|
)
|
|
|
|
const (
|
|
|
|
_ int = syscall.PRIO_USER
|
|
|
|
_ int = syscall.PRIO_PROCESS
|
|
|
|
_ int = syscall.PRIO_PGRP
|
|
|
|
)
|
|
|
|
|
|
|
|
// termios constants
|
|
|
|
const (
|
|
|
|
_ int = syscall.TCIFLUSH
|
|
|
|
_ int = syscall.TCIOFLUSH
|
|
|
|
_ int = syscall.TCOFLUSH
|
|
|
|
)
|
|
|
|
|
|
|
|
// fcntl file locking structure and constants
|
|
|
|
var (
|
|
|
|
_ = syscall.Flock_t{
|
|
|
|
Type: int16(0),
|
|
|
|
Whence: int16(0),
|
|
|
|
Start: int64(0),
|
|
|
|
Len: int64(0),
|
|
|
|
Pid: int32(0),
|
|
|
|
}
|
|
|
|
)
|
|
|
|
const (
|
|
|
|
_ = syscall.F_GETLK
|
|
|
|
_ = syscall.F_SETLK
|
|
|
|
_ = syscall.F_SETLKW
|
|
|
|
)
|
|
|
|
}
|
|
|
|
|
|
|
|
// TestFcntlFlock tests whether the file locking structure matches
|
|
|
|
// the calling convention of each kernel.
|
2017-04-10 11:32:00 +00:00
|
|
|
// On some Linux systems, glibc uses another set of values for the
|
|
|
|
// commands and translates them to the correct value that the kernel
|
|
|
|
// expects just before the actual fcntl syscall. As Go uses raw
|
|
|
|
// syscalls directly, it must use the real value, not the glibc value.
|
|
|
|
// Thus this test also verifies that the Flock_t structure can be
|
|
|
|
// roundtripped with F_SETLK and F_GETLK.
|
2015-08-28 15:33:40 +00:00
|
|
|
func TestFcntlFlock(t *testing.T) {
|
2017-04-10 11:32:00 +00:00
|
|
|
if runtime.GOOS == "darwin" && (runtime.GOARCH == "arm" || runtime.GOARCH == "arm64") {
|
|
|
|
t.Skip("skipping; no child processes allowed on iOS")
|
2015-08-28 15:33:40 +00:00
|
|
|
}
|
|
|
|
flock := syscall.Flock_t{
|
2017-04-10 11:32:00 +00:00
|
|
|
Type: syscall.F_WRLCK,
|
|
|
|
Start: 31415, Len: 271828, Whence: 1,
|
|
|
|
}
|
|
|
|
if os.Getenv("GO_WANT_HELPER_PROCESS") == "" {
|
|
|
|
// parent
|
2018-12-28 15:30:48 +00:00
|
|
|
tempDir, err := ioutil.TempDir("", "TestFcntlFlock")
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("Failed to create temp dir: %v", err)
|
|
|
|
}
|
|
|
|
name := filepath.Join(tempDir, "TestFcntlFlock")
|
2017-04-10 11:32:00 +00:00
|
|
|
fd, err := syscall.Open(name, syscall.O_CREAT|syscall.O_RDWR|syscall.O_CLOEXEC, 0)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("Open failed: %v", err)
|
|
|
|
}
|
2018-12-28 15:30:48 +00:00
|
|
|
defer os.RemoveAll(tempDir)
|
2017-04-10 11:32:00 +00:00
|
|
|
defer syscall.Close(fd)
|
|
|
|
if err := syscall.Ftruncate(fd, 1<<20); err != nil {
|
|
|
|
t.Fatalf("Ftruncate(1<<20) failed: %v", err)
|
|
|
|
}
|
|
|
|
if err := syscall.FcntlFlock(uintptr(fd), syscall.F_SETLK, &flock); err != nil {
|
|
|
|
t.Fatalf("FcntlFlock(F_SETLK) failed: %v", err)
|
|
|
|
}
|
|
|
|
cmd := exec.Command(os.Args[0], "-test.run=^TestFcntlFlock$")
|
|
|
|
cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=1")
|
|
|
|
cmd.ExtraFiles = []*os.File{os.NewFile(uintptr(fd), name)}
|
|
|
|
out, err := cmd.CombinedOutput()
|
|
|
|
if len(out) > 0 || err != nil {
|
|
|
|
t.Fatalf("child process: %q, %v", out, err)
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
// child
|
|
|
|
got := flock
|
|
|
|
// make sure the child lock is conflicting with the parent lock
|
|
|
|
got.Start--
|
|
|
|
got.Len++
|
|
|
|
if err := syscall.FcntlFlock(3, syscall.F_GETLK, &got); err != nil {
|
|
|
|
t.Fatalf("FcntlFlock(F_GETLK) failed: %v", err)
|
|
|
|
}
|
|
|
|
flock.Pid = int32(syscall.Getppid())
|
|
|
|
// Linux kernel always set Whence to 0
|
|
|
|
flock.Whence = 0
|
|
|
|
if got.Type == flock.Type && got.Start == flock.Start && got.Len == flock.Len && got.Pid == flock.Pid && got.Whence == flock.Whence {
|
|
|
|
os.Exit(0)
|
|
|
|
}
|
|
|
|
t.Fatalf("FcntlFlock got %v, want %v", got, flock)
|
2015-08-28 15:33:40 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2014-09-21 17:33:12 +00:00
|
|
|
// TestPassFD tests passing a file descriptor over a Unix socket.
|
|
|
|
//
|
|
|
|
// This test involved both a parent and child process. The parent
|
|
|
|
// process is invoked as a normal test, with "go test", which then
|
|
|
|
// runs the child process by running the current test binary with args
|
|
|
|
// "-test.run=^TestPassFD$" and an environment variable used to signal
|
|
|
|
// that the test should become the child process instead.
|
|
|
|
func TestPassFD(t *testing.T) {
|
2017-04-10 11:32:00 +00:00
|
|
|
testenv.MustHaveExec(t)
|
|
|
|
|
2014-09-21 17:33:12 +00:00
|
|
|
if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
|
|
|
|
passFDChild()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
tempDir, err := ioutil.TempDir("", "TestPassFD")
|
|
|
|
if err != nil {
|
|
|
|
t.Fatal(err)
|
|
|
|
}
|
|
|
|
defer os.RemoveAll(tempDir)
|
|
|
|
|
|
|
|
fds, err := syscall.Socketpair(syscall.AF_LOCAL, syscall.SOCK_STREAM, 0)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("Socketpair: %v", err)
|
|
|
|
}
|
|
|
|
defer syscall.Close(fds[0])
|
|
|
|
defer syscall.Close(fds[1])
|
|
|
|
writeFile := os.NewFile(uintptr(fds[0]), "child-writes")
|
|
|
|
readFile := os.NewFile(uintptr(fds[1]), "parent-reads")
|
|
|
|
defer writeFile.Close()
|
|
|
|
defer readFile.Close()
|
|
|
|
|
|
|
|
cmd := exec.Command(os.Args[0], "-test.run=^TestPassFD$", "--", tempDir)
|
2017-04-10 11:32:00 +00:00
|
|
|
cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=1")
|
2014-09-21 17:33:12 +00:00
|
|
|
cmd.ExtraFiles = []*os.File{writeFile}
|
|
|
|
|
|
|
|
out, err := cmd.CombinedOutput()
|
|
|
|
if len(out) > 0 || err != nil {
|
|
|
|
t.Fatalf("child process: %q, %v", out, err)
|
|
|
|
}
|
|
|
|
|
|
|
|
c, err := net.FileConn(readFile)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("FileConn: %v", err)
|
|
|
|
}
|
|
|
|
defer c.Close()
|
|
|
|
|
|
|
|
uc, ok := c.(*net.UnixConn)
|
|
|
|
if !ok {
|
|
|
|
t.Fatalf("unexpected FileConn type; expected UnixConn, got %T", c)
|
|
|
|
}
|
|
|
|
|
|
|
|
buf := make([]byte, 32) // expect 1 byte
|
|
|
|
oob := make([]byte, 32) // expect 24 bytes
|
|
|
|
closeUnix := time.AfterFunc(5*time.Second, func() {
|
|
|
|
t.Logf("timeout reading from unix socket")
|
|
|
|
uc.Close()
|
|
|
|
})
|
|
|
|
_, oobn, _, _, err := uc.ReadMsgUnix(buf, oob)
|
2018-12-28 15:30:48 +00:00
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("ReadMsgUnix: %v", err)
|
|
|
|
}
|
2014-09-21 17:33:12 +00:00
|
|
|
closeUnix.Stop()
|
|
|
|
|
|
|
|
scms, err := syscall.ParseSocketControlMessage(oob[:oobn])
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("ParseSocketControlMessage: %v", err)
|
|
|
|
}
|
|
|
|
if len(scms) != 1 {
|
|
|
|
t.Fatalf("expected 1 SocketControlMessage; got scms = %#v", scms)
|
|
|
|
}
|
|
|
|
scm := scms[0]
|
|
|
|
gotFds, err := syscall.ParseUnixRights(&scm)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("syscall.ParseUnixRights: %v", err)
|
|
|
|
}
|
|
|
|
if len(gotFds) != 1 {
|
|
|
|
t.Fatalf("wanted 1 fd; got %#v", gotFds)
|
|
|
|
}
|
|
|
|
|
|
|
|
f := os.NewFile(uintptr(gotFds[0]), "fd-from-child")
|
|
|
|
defer f.Close()
|
|
|
|
|
|
|
|
got, err := ioutil.ReadAll(f)
|
|
|
|
want := "Hello from child process!\n"
|
|
|
|
if string(got) != want {
|
|
|
|
t.Errorf("child process ReadAll: %q, %v; want %q", got, err, want)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// passFDChild is the child process used by TestPassFD.
|
|
|
|
func passFDChild() {
|
|
|
|
defer os.Exit(0)
|
|
|
|
|
|
|
|
// Look for our fd. It should be fd 3, but we work around an fd leak
|
2017-04-10 11:32:00 +00:00
|
|
|
// bug here (https://golang.org/issue/2603) to let it be elsewhere.
|
2014-09-21 17:33:12 +00:00
|
|
|
var uc *net.UnixConn
|
|
|
|
for fd := uintptr(3); fd <= 10; fd++ {
|
|
|
|
f := os.NewFile(fd, "unix-conn")
|
|
|
|
var ok bool
|
|
|
|
netc, _ := net.FileConn(f)
|
|
|
|
uc, ok = netc.(*net.UnixConn)
|
|
|
|
if ok {
|
|
|
|
break
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if uc == nil {
|
|
|
|
fmt.Println("failed to find unix fd")
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
// Make a file f to send to our parent process on uc.
|
|
|
|
// We make it in tempDir, which our parent will clean up.
|
|
|
|
flag.Parse()
|
|
|
|
tempDir := flag.Arg(0)
|
|
|
|
f, err := ioutil.TempFile(tempDir, "")
|
|
|
|
if err != nil {
|
|
|
|
fmt.Printf("TempFile: %v", err)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
f.Write([]byte("Hello from child process!\n"))
|
2017-10-07 00:16:47 +00:00
|
|
|
f.Seek(0, io.SeekStart)
|
2014-09-21 17:33:12 +00:00
|
|
|
|
|
|
|
rights := syscall.UnixRights(int(f.Fd()))
|
|
|
|
dummyByte := []byte("x")
|
|
|
|
n, oobn, err := uc.WriteMsgUnix(dummyByte, rights, nil)
|
|
|
|
if err != nil {
|
|
|
|
fmt.Printf("WriteMsgUnix: %v", err)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
if n != 1 || oobn != len(rights) {
|
|
|
|
fmt.Printf("WriteMsgUnix = %d, %d; want 1, %d", n, oobn, len(rights))
|
|
|
|
return
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// TestUnixRightsRoundtrip tests that UnixRights, ParseSocketControlMessage,
|
|
|
|
// and ParseUnixRights are able to successfully round-trip lists of file descriptors.
|
|
|
|
func TestUnixRightsRoundtrip(t *testing.T) {
|
|
|
|
testCases := [...][][]int{
|
|
|
|
{{42}},
|
|
|
|
{{1, 2}},
|
|
|
|
{{3, 4, 5}},
|
|
|
|
{{}},
|
|
|
|
{{1, 2}, {3, 4, 5}, {}, {7}},
|
|
|
|
}
|
|
|
|
for _, testCase := range testCases {
|
|
|
|
b := []byte{}
|
|
|
|
var n int
|
|
|
|
for _, fds := range testCase {
|
|
|
|
// Last assignment to n wins
|
|
|
|
n = len(b) + syscall.CmsgLen(4*len(fds))
|
|
|
|
b = append(b, syscall.UnixRights(fds...)...)
|
|
|
|
}
|
|
|
|
// Truncate b
|
|
|
|
b = b[:n]
|
|
|
|
|
|
|
|
scms, err := syscall.ParseSocketControlMessage(b)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("ParseSocketControlMessage: %v", err)
|
|
|
|
}
|
|
|
|
if len(scms) != len(testCase) {
|
|
|
|
t.Fatalf("expected %v SocketControlMessage; got scms = %#v", len(testCase), scms)
|
|
|
|
}
|
|
|
|
for i, scm := range scms {
|
|
|
|
gotFds, err := syscall.ParseUnixRights(&scm)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("ParseUnixRights: %v", err)
|
|
|
|
}
|
|
|
|
wantFds := testCase[i]
|
|
|
|
if len(gotFds) != len(wantFds) {
|
|
|
|
t.Fatalf("expected %v fds, got %#v", len(wantFds), gotFds)
|
|
|
|
}
|
|
|
|
for j, fd := range gotFds {
|
|
|
|
if fd != wantFds[j] {
|
|
|
|
t.Fatalf("expected fd %v, got %v", wantFds[j], fd)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2015-08-28 15:33:40 +00:00
|
|
|
|
|
|
|
func TestRlimit(t *testing.T) {
|
|
|
|
var rlimit, zero syscall.Rlimit
|
|
|
|
err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlimit)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("Getrlimit: save failed: %v", err)
|
|
|
|
}
|
|
|
|
if zero == rlimit {
|
|
|
|
t.Fatalf("Getrlimit: save failed: got zero value %#v", rlimit)
|
|
|
|
}
|
|
|
|
set := rlimit
|
|
|
|
set.Cur = set.Max - 1
|
|
|
|
err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &set)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("Setrlimit: set failed: %#v %v", set, err)
|
|
|
|
}
|
|
|
|
var get syscall.Rlimit
|
|
|
|
err = syscall.Getrlimit(syscall.RLIMIT_NOFILE, &get)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("Getrlimit: get failed: %v", err)
|
|
|
|
}
|
|
|
|
set = rlimit
|
|
|
|
set.Cur = set.Max - 1
|
|
|
|
if set != get {
|
|
|
|
// Seems like Darwin requires some privilege to
|
|
|
|
// increase the soft limit of rlimit sandbox, though
|
|
|
|
// Setrlimit never reports an error.
|
|
|
|
switch runtime.GOOS {
|
|
|
|
case "darwin":
|
|
|
|
default:
|
|
|
|
t.Fatalf("Rlimit: change failed: wanted %#v got %#v", set, get)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rlimit)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("Setrlimit: restore failed: %#v %v", rlimit, err)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func TestSeekFailure(t *testing.T) {
|
2017-10-07 00:16:47 +00:00
|
|
|
_, err := syscall.Seek(-1, 0, io.SeekStart)
|
2015-08-28 15:33:40 +00:00
|
|
|
if err == nil {
|
|
|
|
t.Fatalf("Seek(-1, 0, 0) did not fail")
|
|
|
|
}
|
|
|
|
str := err.Error() // used to crash on Linux
|
|
|
|
t.Logf("Seek: %v", str)
|
|
|
|
if str == "" {
|
|
|
|
t.Fatalf("Seek(-1, 0, 0) return error with empty message")
|
|
|
|
}
|
|
|
|
}
|