Golang syscall.Errno函數代碼示例

func Tcsetpgrp(fd int, pid int) error {
	i := syscall.Errno(C.f(C.int(fd), C.pid_t(pid)))
	if i != 0 {
		return syscall.Errno(i)
	}
	return nil
}

func (s *resultSrv) Run() {
	var o *syscall.Overlapped
	var key uint32
	var r ioResult
	for {
		r.err = syscall.GetQueuedCompletionStatus(s.iocp, &(r.qty), &key, &o, 0)
		if r.err == syscall.Errno(syscall.WAIT_TIMEOUT) && o == nil {
			runtime_blockingSyscallHint()
			r.err = syscall.GetQueuedCompletionStatus(s.iocp, &(r.qty), &key, &o, syscall.INFINITE)
		}
		switch {
		case r.err == nil:
			// Dequeued successfully completed IO packet.
		case r.err == syscall.Errno(syscall.WAIT_TIMEOUT) && o == nil:
			// Wait has timed out (should not happen now, but might be used in the future).
			panic("GetQueuedCompletionStatus timed out")
		case o == nil:
			// Failed to dequeue anything -> report the error.
			panic("GetQueuedCompletionStatus failed " + r.err.Error())
		default:
			// Dequeued failed IO packet.
		}
		(*anOp)(unsafe.Pointer(o)).resultc <- r
	}
}

// GetsockoptInt wraps syscall.GetsockoptInt.
func (sw *Switch) GetsockoptInt(s, level, opt int) (soerr int, err error) {
	so := sw.sockso(s)
	if so == nil {
		return syscall.GetsockoptInt(s, level, opt)
	}
	sw.fmu.RLock()
	f, _ := sw.fltab[FilterGetsockoptInt]
	sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {
		return -1, err
	}
	soerr, so.Err = syscall.GetsockoptInt(s, level, opt)
	so.SocketErr = syscall.Errno(soerr)
	if err = af.apply(so); err != nil {
		return -1, err
	}

	if so.Err != nil {
		return -1, so.Err
	}
	if opt == syscall.SO_ERROR && (so.SocketErr == syscall.Errno(0) || so.SocketErr == syscall.EISCONN) {
		sw.smu.Lock()
		sw.stats.getLocked(so.Cookie).Connected++
		sw.smu.Unlock()
	}
	return soerr, nil
}

func TestIsError(t *testing.T) {
	if !IsErrorTemporary(ErrTimeout) {
		t.Fatal("ErrTimeout not temporary!")
	}
	if !IsErrorTimeout(ErrTimeout) {
		t.Fatal("ErrTimeout not timeout!")
	}
	if !IsErrorTemporary(syscall.Errno(syscall.EINTR)) {
		t.Fatal("EINTR not temporary!")
	}
	if IsErrorTimeout(syscall.Errno(syscall.EINTR)) {
		t.Fatal("EINTR is timeout!")
	}
	if IsErrorTemporary(ErrClosing) {
		t.Fatal("ErrClosing is temporary!")
	}
	if IsErrorTimeout(ErrClosing) {
		t.Fatal("ErrClosing is timeout!")
	}
	if IsErrorTemporary(syscall.Errno(syscall.EFAULT)) {
		t.Fatal("EFAULT is temporary!")
	}
	if IsErrorTimeout(syscall.Errno(syscall.EFAULT)) {
		t.Fatal("EFAULT is timeout!")
	}
}

// DOES NOT LOCK OR CHECK VALIDITY
// Assumes caller has already done this
// Wrapper for seccomp_rule_add_... functions
func (f *ScmpFilter) addRuleWrapper(call ScmpSyscall, action ScmpAction, exact bool, cond C.scmp_cast_t) error {
	var length C.uint
	if cond != nil {
		length = 1
	} else {
		length = 0
	}

	var retCode C.int
	if exact {
		retCode = C.seccomp_rule_add_exact_array(f.filterCtx, action.toNative(), C.int(call), length, cond)
	} else {
		retCode = C.seccomp_rule_add_array(f.filterCtx, action.toNative(), C.int(call), length, cond)
	}

	if syscall.Errno(-1*retCode) == syscall.EFAULT {
		return fmt.Errorf("unrecognized syscall")
	} else if syscall.Errno(-1*retCode) == syscall.EPERM {
		return fmt.Errorf("requested action matches default action of filter")
	} else if retCode != 0 {
		return syscall.Errno(-1 * retCode)
	}

	return nil
}

// MsglvlSet returns the read-msglvl, post-set-msglvl of the given interface.
func (e *Ethtool) MsglvlSet(intf string, valset uint32) (uint32, uint32, error) {
	edata := ethtoolValue{
		cmd: ETHTOOL_GMSGLVL,
	}

	var name [IFNAMSIZ]byte
	copy(name[:], []byte(intf))

	ifr := ifreq{
		ifr_name: name,
		ifr_data: uintptr(unsafe.Pointer(&edata)),
	}

	_, _, ep := syscall.Syscall(syscall.SYS_IOCTL, uintptr(e.fd),
		SIOCETHTOOL, uintptr(unsafe.Pointer(&ifr)))
	if ep != 0 {
		return 0, 0, syscall.Errno(ep)
	}

	readval := edata.data

	edata.cmd = ETHTOOL_SMSGLVL
	edata.data = valset

	_, _, ep = syscall.Syscall(syscall.SYS_IOCTL, uintptr(e.fd),
		SIOCETHTOOL, uintptr(unsafe.Pointer(&ifr)))
	if ep != 0 {
		return 0, 0, syscall.Errno(ep)
	}

	return readval, edata.data, nil
}

func (fd *netFD) connect(la, ra syscall.Sockaddr, deadline time.Time) error {
	// Do not need to call fd.writeLock here,
	// because fd is not yet accessible to user,
	// so no concurrent operations are possible.
	switch err := connectFunc(fd.sysfd, ra); err {
	case syscall.EINPROGRESS, syscall.EALREADY, syscall.EINTR:
	case nil, syscall.EISCONN:
		if !deadline.IsZero() && deadline.Before(time.Now()) {
			return errTimeout
		}
		if err := fd.init(); err != nil {
			return err
		}
		return nil
	case syscall.EINVAL:
		// On Solaris we can see EINVAL if the socket has
		// already been accepted and closed by the server.
		// Treat this as a successful connection--writes to
		// the socket will see EOF.  For details and a test
		// case in C see https://golang.org/issue/6828.
		if runtime.GOOS == "solaris" {
			return nil
		}
		fallthrough
	default:
		return os.NewSyscallError("connect", err)
	}
	if err := fd.init(); err != nil {
		return err
	}
	if !deadline.IsZero() {
		fd.setWriteDeadline(deadline)
		defer fd.setWriteDeadline(noDeadline)
	}
	for {
		// Performing multiple connect system calls on a
		// non-blocking socket under Unix variants does not
		// necessarily result in earlier errors being
		// returned. Instead, once runtime-integrated network
		// poller tells us that the socket is ready, get the
		// SO_ERROR socket option to see if the connection
		// succeeded or failed. See issue 7474 for further
		// details.
		if err := fd.pd.WaitWrite(); err != nil {
			return err
		}
		nerr, err := getsockoptIntFunc(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_ERROR)
		if err != nil {
			return os.NewSyscallError("getsockopt", err)
		}
		switch err := syscall.Errno(nerr); err {
		case syscall.EINPROGRESS, syscall.EALREADY, syscall.EINTR:
		case syscall.Errno(0), syscall.EISCONN:
			return nil
		default:
			return os.NewSyscallError("getsockopt", err)
		}
	}
}

func lookup(gid int, groupname string, lookupByName bool) (*Group, error) {
	var (
		grp    C.struct_group
		result *C.struct_group
	)
	var bufSize C.long
	if runtime.GOOS == "freebsd" {
		// FreeBSD doesn't have _SC_GETPW_R_SIZE_MAX
		// and just returns -1.  So just use the same
		// size that Linux returns
		bufSize = 1024
	} else {
		bufSize = C.sysconf(C._SC_GETPW_R_SIZE_MAX)
		if bufSize <= 0 || bufSize > 1<<20 {
			return nil, fmt.Errorf(
				"user: unreasonable _SC_GETPW_R_SIZE_MAX of %d", bufSize)
		}
	}
	buf := C.malloc(C.size_t(bufSize))
	defer C.free(buf)
	var rv C.int
	if lookupByName {
		nameC := C.CString(groupname)
		defer C.free(unsafe.Pointer(nameC))
		rv = C.getgrnam_r(nameC,
			&grp,
			(*C.char)(buf),
			C.size_t(bufSize),
			&result)
		if rv != 0 {
			return nil, fmt.Errorf(
				"group: lookup groupname %s: %s", groupname, syscall.Errno(rv))
		}
		if result == nil {
			return nil, UnknownGroupError(groupname)
		}

	} else {
		rv = C.mygetgrgid_r(C.int(gid),
			&grp,
			(*C.char)(buf),
			C.size_t(bufSize),
			&result)
		if rv != 0 {
			return nil, fmt.Errorf("group: lookup groupid %d: %s", gid, syscall.Errno(rv))
		}
		if result == nil {
			return nil, UnknownGroupIdError(gid)
		}
	}
	g := &Group{
		Gid:     strconv.Itoa(int(grp.gr_gid)),
		Name:    C.GoString(grp.gr_name),
		Members: getMembers(grp),
	}

	return g, nil
}

// Change the coloring to c, but only in those bits where m is 1.
func (w *Wrapper) SetMask(c Color, m uint16) error {
	current := w32.GetConsoleScreenBufferInfo(w.h)
	if current == nil {
		return syscall.Errno(w32.GetLastError())
	}
	if !w32.SetConsoleTextAttribute(w.h, apply(current.WAttributes, uint16(c), uint16(m))) {
		return syscall.Errno(w32.GetLastError())
	}
	return nil
}

// GetUniqueValues returns all unique values for a given field.
func (j *Journal) GetUniqueValues(field string) ([]string, error) {
	var result []string

	sd_journal_query_unique, err := getFunction("sd_journal_query_unique")
	if err != nil {
		return nil, err
	}

	sd_journal_enumerate_unique, err := getFunction("sd_journal_enumerate_unique")
	if err != nil {
		return nil, err
	}

	sd_journal_restart_unique, err := getFunction("sd_journal_restart_unique")
	if err != nil {
		return nil, err
	}

	j.mu.Lock()
	defer j.mu.Unlock()

	f := C.CString(field)
	defer C.free(unsafe.Pointer(f))

	r := C.my_sd_journal_query_unique(sd_journal_query_unique, j.cjournal, f)

	if r < 0 {
		return nil, fmt.Errorf("failed to query journal: %d", syscall.Errno(-r))
	}

	// Implements the SD_JOURNAL_FOREACH_UNIQUE macro from sd-journal.h
	var d unsafe.Pointer
	var l C.size_t
	C.my_sd_journal_restart_unique(sd_journal_restart_unique, j.cjournal)
	for {
		r = C.my_sd_journal_enumerate_unique(sd_journal_enumerate_unique, j.cjournal, &d, &l)
		if r == 0 {
			break
		}

		if r < 0 {
			return nil, fmt.Errorf("failed to read message field: %d", syscall.Errno(-r))
		}

		msg := C.GoStringN((*C.char)(d), C.int(l))
		kv := strings.SplitN(msg, "=", 2)
		if len(kv) < 2 {
			return nil, fmt.Errorf("failed to parse field")
		}

		result = append(result, kv[1])
	}

	return result, nil
}

// netstat -ano | findstr 202.89.233.104
func getTCPTable() *MIB_TCPTABLE2 {
	getTCPTable2 := syscall.NewLazyDLL("Iphlpapi.dll").NewProc("GetTcpTable2")
	var n uint32
	if err, _, _ := getTCPTable2.Call(uintptr(unsafe.Pointer(&MIB_TCPTABLE2{})), uintptr(unsafe.Pointer(&n)), 1); syscall.Errno(err) != syscall.ERROR_INSUFFICIENT_BUFFER {
		common.Error("Error calling GetTcpTable2: %v", syscall.Errno(err))
	}
	b := make([]byte, n)
	if err, _, _ := getTCPTable2.Call(uintptr(unsafe.Pointer(&b[0])), uintptr(unsafe.Pointer(&n)), 1); err != 0 {
		common.Error("Error calling GetTcpTable2: %v", syscall.Errno(err))
	}
	table := newTCPTable(NewClassReader(b))
	return table
}

// The GetExtendedTcpTableIPv4 function retrieves a table that contains a list of TCP
// endpoints available to the application.
func GetExtendedTcpTableIPv4() (MIB_TCPTABLE_OWNER_PID, error) {
	var (
		TcpTable     MIB_TCPTABLE_OWNER_PID
		TcpTableSize uint32
	)

	TcpTableSize = uint32(unsafe.Sizeof(TcpTable))

	tableSlice := make([]byte, TcpTableSize)

	r, _, _ := procGetExtendedTcpTable.Call(
		uintptr(unsafe.Pointer(&tableSlice[0])),
		uintptr(unsafe.Pointer(&TcpTableSize)),
		uintptr(0),
		uintptr(syscall.AF_INET),
		uintptr(TCP_TABLE_OWNER_PID_ALL),
		uintptr(0))

	if syscall.Errno(r) == syscall.ERROR_INSUFFICIENT_BUFFER {
		tableSlice = make([]byte, TcpTableSize)

		r, _, _ = procGetExtendedTcpTable.Call(
			uintptr(unsafe.Pointer(&tableSlice[0])),
			uintptr(unsafe.Pointer(&TcpTableSize)),
			uintptr(0),
			uintptr(syscall.AF_INET),
			uintptr(TCP_TABLE_OWNER_PID_ALL),
			uintptr(0))
	}

	buf := bytes.NewReader(tableSlice)
	err := binary.Read(buf, binary.LittleEndian, &TcpTable.NumEntries)
	if err != nil {
		return TcpTable, err
	}

	TcpTable.Table = make([]MIB_TCPROW_OWNER_PID, TcpTable.NumEntries)

	for i := 0; i < int(TcpTable.NumEntries); i++ {
		err := binary.Read(buf, binary.LittleEndian, &TcpTable.Table[i])
		if err != nil {
			break
		}
	}

	if r != 0 {
		return TcpTable, syscall.Errno(r)
	}
	return TcpTable, nil
}

func lookupUnix(gid int, groupname string, lookupByName bool) (*Group, error) {
	var grp C.struct_group
	var result *C.struct_group

	var bufSize C.long
	if runtime.GOOS == "freebsd" {
		panic("Don't know how to deal with freebsd.")
	} else {
		bufSize = C.sysconf(C._SC_GETGR_R_SIZE_MAX) * 20
		if bufSize <= 0 || bufSize > 1<<20 {
			return nil, fmt.Errorf("group: unreasonable _SC_GETGR_R_SIZE_MAX of %d", bufSize)
		}
	}
	buf := C.malloc(C.size_t(bufSize))
	defer C.free(buf)
	var rv C.int
	if lookupByName {
		nameC := C.CString(groupname)
		defer C.free(unsafe.Pointer(nameC))
		rv = C.mygetgrnam_r(nameC,
			&grp,
			(*C.char)(buf),
			C.size_t(bufSize),
			&result)
		if rv != 0 {
			return nil, fmt.Errorf("group: lookup groupname %s: %s", groupname, syscall.Errno(rv))
		}
		if result == nil {
			return nil, UnknownGroupError(groupname)
		}
	} else {
		rv = C.mygetgrgid_r(C.int(gid),
			&grp,
			(*C.char)(buf),
			C.size_t(bufSize),
			&result)
		if rv != 0 {
			return nil, fmt.Errorf("group: lookup groupid %d: %s", gid, syscall.Errno(rv))
		}
		if result == nil {
			return nil, UnknownGroupIdError(gid)
		}
	}
	u := &Group{
		Gid:       strconv.Itoa(int(grp.gr_gid)),
		Groupname: C.GoString(grp.gr_name),
	}
	return u, nil
}

// this is close to the connect() function inside stdlib/net
func connect(fd int, ra syscall.Sockaddr, deadline time.Time) error {
	switch err := syscall.Connect(fd, ra); err {
	case syscall.EINPROGRESS, syscall.EALREADY, syscall.EINTR:
	case nil, syscall.EISCONN:
		if !deadline.IsZero() && deadline.Before(time.Now()) {
			return errTimeout
		}
		return nil
	default:
		return err
	}

	poller, err := poll.New(fd)
	if err != nil {
		return err
	}
	defer poller.Close()

	for {
		if err = poller.WaitWrite(deadline); err != nil {
			return err
		}

		// if err := fd.pd.WaitWrite(); err != nil {
		// 	return err
		// }
		// i'd use the above fd.pd.WaitWrite to poll io correctly, just like net sockets...
		// but of course, it uses the damn runtime_* functions that _cannot_ be used by
		// non-go-stdlib source... seriously guys, this is not nice.
		// we're relegated to using syscall.Select (what nightmare that is) or using
		// a simple but totally bogus time-based wait. such garbage.
		var nerr int
		nerr, err = syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_ERROR)
		if err != nil {
			return err
		}
		switch err = syscall.Errno(nerr); err {
		case syscall.EINPROGRESS, syscall.EALREADY, syscall.EINTR:
			continue
		case syscall.Errno(0), syscall.EISCONN:
			if !deadline.IsZero() && deadline.Before(time.Now()) {
				return errTimeout
			}
			return nil
		default:
			return err
		}
	}
}

func makeFlushFS() (server fuse.Server, err error) {
	// Check the flags.
	if *fFlushesFile == 0 || *fFsyncsFile == 0 {
		err = fmt.Errorf("You must set the flushfs flags.")
		return
	}

	// Set up the files.
	flushes := os.NewFile(uintptr(*fFlushesFile), "(flushes file)")
	fsyncs := os.NewFile(uintptr(*fFsyncsFile), "(fsyncs file)")

	// Set up errors.
	var flushErr error
	var fsyncErr error

	if *fFlushError != 0 {
		flushErr = syscall.Errno(*fFlushError)
	}

	if *fFsyncError != 0 {
		fsyncErr = syscall.Errno(*fFsyncError)
	}

	// Report flushes and fsyncs by writing the contents followed by a newline.
	report := func(f *os.File, outErr error) func(string) error {
		return func(s string) (err error) {
			buf := []byte(s)
			buf = append(buf, '\n')

			_, err = f.Write(buf)
			if err != nil {
				err = fmt.Errorf("Write: %v", err)
				return
			}

			err = outErr
			return
		}
	}

	reportFlush := report(flushes, flushErr)
	reportFsync := report(fsyncs, fsyncErr)

	// Create the file system.
	server, err = flushfs.NewFileSystem(reportFlush, reportFsync)

	return
}