// watcher tracks the changes to the value file of a pin
func (pin *Pin) watcher() {
buf := make([]byte, syscall.SizeofInotifyEvent)
n, err := syscall.Read(pin.Fd, buf)
for err == nil && n == syscall.SizeofInotifyEvent {
data, _ := ioutil.ReadFile(pin.ValuePath)
pin.State = data[0]
pin.EventChannel <- &Event{State: pin.State}
n, err = syscall.Read(pin.Fd, buf)
}
}
func readPipe(p int, c chan<- string) {
var s string
buf := make([]byte, 4096)
n, _ := syscall.Read(p, buf)
for n > 0 {
s += string(buf[:n])
n, _ = syscall.Read(p, buf)
}
c <- s
}
// handle requests
func (nbd *NBD) handle() {
buf := make([]byte, 2<<19)
var x request
for {
syscall.Read(nbd.socket, buf[0:28])
x.magic = binary.BigEndian.Uint32(buf)
x.typus = binary.BigEndian.Uint32(buf[4:8])
x.handle = binary.BigEndian.Uint64(buf[8:16])
x.from = binary.BigEndian.Uint64(buf[16:24])
x.len = binary.BigEndian.Uint32(buf[24:28])
switch x.magic {
case NBD_REPLY_MAGIC:
fallthrough
case NBD_REQUEST_MAGIC:
switch x.typus {
case NBD_CMD_READ:
nbd.device.ReadAt(buf[16:16+x.len], int64(x.from))
binary.BigEndian.PutUint32(buf[0:4], NBD_REPLY_MAGIC)
binary.BigEndian.PutUint32(buf[4:8], 0)
syscall.Write(nbd.socket, buf[0:16+x.len])
case NBD_CMD_WRITE:
n, _ := syscall.Read(nbd.socket, buf[28:28+x.len])
for uint32(n) < x.len {
m, _ := syscall.Read(nbd.socket, buf[28+n:28+x.len])
n += m
}
nbd.device.WriteAt(buf[28:28+x.len], int64(x.from))
binary.BigEndian.PutUint32(buf[0:4], NBD_REPLY_MAGIC)
binary.BigEndian.PutUint32(buf[4:8], 0)
syscall.Write(nbd.socket, buf[0:16])
case NBD_CMD_DISC:
panic("Disconnect")
case NBD_CMD_FLUSH:
nbd.device.Sync()
binary.BigEndian.PutUint32(buf[0:4], NBD_REPLY_MAGIC)
binary.BigEndian.PutUint32(buf[4:8], 1)
syscall.Write(nbd.socket, buf[0:16])
case NBD_CMD_TRIM:
binary.BigEndian.PutUint32(buf[0:4], NBD_REPLY_MAGIC)
binary.BigEndian.PutUint32(buf[4:8], 1)
syscall.Write(nbd.socket, buf[0:16])
default:
panic("unknown command")
}
default:
panic("Invalid packet")
}
}
}
func kmemleakScan(report bool) {
fd, err := syscall.Open("/sys/kernel/debug/kmemleak", syscall.O_RDWR, 0)
if err != nil {
panic(err)
}
defer syscall.Close(fd)
// Kmemleak has false positives. To mitigate most of them, it checksums
// potentially leaked objects, and reports them only on the next scan
// iff the checksum does not change. Because of that we do the following
// intricate dance:
// Scan, sleep, scan again. At this point we can get some leaks.
// If there are leaks, we sleep and scan again, this can remove
// false leaks. Then, read kmemleak again. If we get leaks now, then
// hopefully these are true positives during the previous testing cycle.
if _, err := syscall.Write(fd, []byte("scan")); err != nil {
panic(err)
}
time.Sleep(time.Second)
if _, err := syscall.Write(fd, []byte("scan")); err != nil {
panic(err)
}
if report {
if kmemleakBuf == nil {
kmemleakBuf = make([]byte, 128<<10)
}
n, err := syscall.Read(fd, kmemleakBuf)
if err != nil {
panic(err)
}
if n != 0 {
time.Sleep(time.Second)
if _, err := syscall.Write(fd, []byte("scan")); err != nil {
panic(err)
}
n, err := syscall.Read(fd, kmemleakBuf)
if err != nil {
panic(err)
}
if n != 0 {
// BUG in output should be recognized by manager.
Logf(0, "BUG: memory leak:\n%s\n", kmemleakBuf[:n])
}
}
}
if _, err := syscall.Write(fd, []byte("clear")); err != nil {
panic(err)
}
}
func (fd *netFD) Read(p []byte) (n int, err os.Error) {
if fd == nil || fd.sysfile == nil {
return 0, os.EINVAL
}
fd.rio.Lock()
defer fd.rio.Unlock()
fd.incref()
defer fd.decref()
if fd.rdeadline_delta > 0 {
fd.rdeadline = pollserver.Now() + fd.rdeadline_delta
} else {
fd.rdeadline = 0
}
var oserr os.Error
for {
var errno int
n, errno = syscall.Read(fd.sysfile.Fd(), p)
if errno == syscall.EAGAIN && fd.rdeadline >= 0 {
pollserver.WaitRead(fd)
continue
}
if errno != 0 {
n = 0
oserr = os.Errno(errno)
} else if n == 0 && errno == 0 && fd.proto != syscall.SOCK_DGRAM {
err = os.EOF
}
break
}
if oserr != nil {
err = &OpError{"read", fd.net, fd.raddr, oserr}
}
return
}
func main() {
acceptingFd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
check(err)
addr := &syscall.SockaddrInet4{Port: 3000, Addr: [4]byte{0, 0, 0, 0}}
err = syscall.Bind(acceptingFd, addr)
check(err)
err = syscall.Listen(acceptingFd, 100)
check(err)
for {
connectionFd, _, err := syscall.Accept(acceptingFd)
check(err)
fmt.Println("Accepted new connectrion")
data := make([]byte, 1024)
_, err = syscall.Read(connectionFd, data)
check(err)
fmt.Printf("Received: %s\n", string(data))
_, err = syscall.Write(connectionFd, data)
check(err)
err = syscall.Close(connectionFd)
check(err)
}
}
func read(u U, a []uint64) uint64 {
fd, buf, size := int(a[0]), a[1], a[2]
tmp := make([]byte, size)
n, _ := syscall.Read(fd, tmp)
u.MemWrite(buf, tmp[:n])
return uint64(n)
}
func (fd *netFD) Read(p []byte) (n int, err error) {
if err := fd.readLock(); err != nil {
return 0, err
}
defer fd.readUnlock()
if err := fd.pd.prepareRead(); err != nil {
return 0, err
}
for {
n, err = syscall.Read(fd.sysfd, p)
if err != nil {
n = 0
if err == syscall.EAGAIN {
if err = fd.pd.waitRead(); err == nil {
continue
}
}
}
err = fd.eofError(n, err)
break
}
if _, ok := err.(syscall.Errno); ok {
err = os.NewSyscallError("read", err)
}
return
}
func (tc *TunnelConn) readOnce(fd int) (num int, err error) {
num, err = syscall.Read(fd, buf)
if num == 0 || err != nil && err != syscall.EAGAIN {
tc.shutdown()
}
return
}
func (fd *netFD) Read(p []byte) (n int, err error) {
fd.rio.Lock()
defer fd.rio.Unlock()
if err := fd.incref(false); err != nil {
return 0, err
}
defer fd.decref()
for {
n, err = syscall.Read(int(fd.sysfd), p)
if err == syscall.EAGAIN {
err = errTimeout
if fd.rdeadline >= 0 {
if err = fd.pollServer.WaitRead(fd); err == nil {
continue
}
}
}
if err != nil {
n = 0
} else if n == 0 && err == nil && fd.sotype != syscall.SOCK_DGRAM {
err = io.EOF
}
break
}
if err != nil && err != io.EOF {
err = &OpError{"read", fd.net, fd.raddr, err}
}
return
}
// Read reads up to len(p) bytes into p. It returns the number of
// bytes read (0 <= n <= len(p)) and any error encountered. If some
// data is available but not len(p) bytes, Read returns what is
// available instead of waiting for more. Read is formally and
// semantically compatible with the Read method of the io.Reader
// interface. See documentation of this interface method for more
// details. In addition Read honors the timeout set by
// (*FD).SetDeadline and (*FD).SetReadDeadline. If no data are read
// before the timeout expires Read returns with err == ErrTimeout (and
// n == 0). If the read(2) system-call returns 0, Read returns with
// err = io.EOF (and n == 0).
func (fd *FD) Read(p []byte) (n int, err error) {
if err = fd.readLock(); err != nil {
return 0, err
}
defer fd.readUnlock()
if err = fd.pd.PrepareRead(); err != nil {
return 0, err
}
for {
n, err = syscall.Read(int(fd.sysfd), p)
if err != nil {
n = 0
if err != syscall.EAGAIN {
break
}
if err = fd.pd.WaitRead(); err != nil {
break
}
continue
}
if n == 0 && len(p) > 0 {
err = io.EOF
}
break
}
return n, err
}
func main() {
args := Arguments()
infile, args, err := args.String("in-file", nil)
Check(err)
outfile, args, err := args.String("out-file", nil)
Check(err)
infd, err := syscall.Open(infile, int(ReadOnly), 0)
Check(err)
defer func() { Check(syscall.Close(infd)) }()
flags := Create | WriteOnly | Truncate
perms := 0 |
UserRead | UserWrite |
GroupRead | GroupWrite |
OtherRead | OtherWrite
outfd, err := syscall.Open(outfile, int(flags), uint32(perms))
Check(err)
defer func() { Check(syscall.Close(outfd)) }()
bufSize := 1024
buf := make([]byte, bufSize)
var n int
for {
n, err = syscall.Read(infd, buf)
Check(err)
if n == 0 {
break
}
_, err = syscall.Write(outfd, buf[:n])
Check(err)
}
}
func main() {
flag.Parse()
args = flag.Args()
if len(args) <= 0 {
fmt.Fprintf(os.Stderr, "Must specify at least one argument to run:\n")
fmt.Fprintf(os.Stderr, "\t%s <options> <command> <arguments>...\n", os.Args[0])
flag.PrintDefaults()
return
}
startCommand(false)
usr1c := make(chan os.Signal)
signal.Notify(usr1c, syscall.SIGUSR1)
go func() {
for {
<-usr1c
if canExecute() {
startCommand(true)
}
}
}()
for {
inotifyFd, err := syscall.InotifyInit()
if err != nil {
log.Fatalf("Inotify init failed: %v", err)
}
recdepth := 0
if *recurse {
recdepth = *depth
}
registerDirectory(inotifyFd, ".", recdepth)
inotifyBuf := make([]byte, 1024*syscall.SizeofInotifyEvent+16)
for {
n, err := syscall.Read(inotifyFd, inotifyBuf[0:])
if err == io.EOF {
break
}
if err != nil {
log.Printf("Can not read inotify: %v", err)
break
}
if n > syscall.SizeofInotifyEvent {
if canExecute() {
startCommand(true)
}
}
}
syscall.Close(inotifyFd)
}
}
func (fd *netFD) Read(p []byte) (n int, err error) { // 每个读写都被加锁，因此可以序列化运行
if err := fd.readLock(); err != nil { // 对每个fd的读都序列化
return 0, err
}
defer fd.readUnlock() // 在退出时解锁
if err := fd.pd.PrepareRead(); err != nil { // 如果读错误，返回
return 0, err
}
for {
n, err = syscall.Read(fd.sysfd, p)
if err != nil { // 如果读出现错误
n = 0
if err == syscall.EAGAIN { // 如果是EAGAIN调用WaitRead，等待读事件
if err = fd.pd.WaitRead(); err == nil { // 事件出现后返回，异步变为同步操作
continue
}
}
}
err = fd.eofError(n, err)
break // 跳出循环
}
if _, ok := err.(syscall.Errno); ok {
err = os.NewSyscallError("read", err)
}
return
}
func (w *Watcher) readEvent() {
var (
buf [syscall.SizeofInotifyEvent * 4096]byte // Buffer for a maximum of 4096 raw events
n int // Number of bytes read with read()
errno error // Syscall errno
)
for {
select {
case <-w.done:
syscall.Close(w.fd)
close(w.acceptEvent)
close(w.Error)
return
default:
}
n, errno = syscall.Read(w.fd, buf[0:])
if n == 0 {
syscall.Close(w.fd)
close(w.acceptEvent)
close(w.Error)
return
}
if n < syscall.SizeofInotifyEvent {
log.Fatal("size of InotifyEvent error", errno)
}
var offset uint32 = 0
for offset <= uint32(n-syscall.SizeofInotifyEvent) {
raw := (*syscall.InotifyEvent)(unsafe.Pointer(&buf[offset]))
event := new(FileEvent)
event.wd = raw.Wd
event.nameLen = raw.Len
event.mask = raw.Mask
event.cookie = raw.Cookie
path := w.wm.paths[int(raw.Wd)]
if raw.Len > 0 {
// Point "bytes" at the first byte of the filename
bytes := (*[syscall.PathMax]byte)(unsafe.Pointer(&buf[offset+syscall.SizeofInotifyEvent]))
// The filename is padded with NUL bytes. TrimRight() gets rid of those.
event.fileName = path + "/" + strings.TrimRight(string(bytes[0:raw.Len]), "\000")
}
if _, found := w.skipExt[filepath.Ext(event.fileName)]; !found {
fmt.Println("--->", w.skipExt, "--->", filepath.Ext(event.fileName), "--->", found)
//发送事件acceptEvent通道
w.acceptEvent <- event
} else {
fmt.Println("过滤文件:", event.fileName)
}
offset += syscall.SizeofInotifyEvent + raw.Len
}
}
}
func (fd *netFD) Read(p []byte) (n int, err error) {
if err := fd.readLock(); err != nil {
return 0, err
}
defer fd.readUnlock()
if len(p) == 0 {
// If the caller wanted a zero byte read, return immediately
// without trying. (But after acquiring the readLock.) Otherwise
// syscall.Read returns 0, nil and eofError turns that into
// io.EOF.
// TODO(bradfitz): make it wait for readability? (Issue 15735)
return 0, nil
}
if err := fd.pd.prepareRead(); err != nil {
return 0, err
}
for {
n, err = syscall.Read(fd.sysfd, p)
if err != nil {
n = 0
if err == syscall.EAGAIN {
if err = fd.pd.waitRead(); err == nil {
continue
}
}
}
err = fd.eofError(n, err)
break
}
if _, ok := err.(syscall.Errno); ok {
err = os.NewSyscallError("read", err)
}
return
}
func main() {
log.SetFlags(log.LstdFlags | log.Lshortfile)
inotify_fd, err := syscall.InotifyInit()
if err != nil {
log.Fatal(err)
}
paths := make(map[int]string)
add_watch_r(inotify_fd, "/home/feng/workspace/rssminer", paths)
log.Print("watcher added")
for {
var (
buf [syscall.SizeofInotifyEvent * 4096]byte
)
n, _ := syscall.Read(inotify_fd, buf[0:])
offset := 0
for offset <= n-syscall.SizeofInotifyEvent {
raw := (*syscall.InotifyEvent)(unsafe.Pointer(&buf[offset]))
wd := int(raw.Wd)
file := paths[wd]
mask := raw.Mask
printEvent(file, mask)
offset += syscall.SizeofInotifyEvent + int(raw.Len)
}
}
}
func CgcSyscall(u models.Usercorn) {
// TODO: handle errors or something
args, _ := u.ReadRegs(LinuxRegs)
eax, _ := u.RegRead(uc.X86_REG_EAX)
var ret uint64
switch eax {
case 1: // _terminate
syscall.Exit(int(args[0]))
case 2: // transmit
mem, _ := u.MemRead(args[1], args[2])
n, _ := syscall.Write(int(args[0]), mem)
writeAddr(u, args[3], uint64(n))
case 3: // receive
tmp := make([]byte, args[2])
n, _ := syscall.Read(int(args[0]), tmp)
u.MemWrite(args[1], tmp[:n])
writeAddr(u, args[3], uint64(n))
case 5: // allocate
addr, _ := u.Mmap(0, args[0])
// args[1] == is executable
writeAddr(u, args[2], addr)
case 7: // random
tmp := make([]byte, args[1])
rand.Read(tmp)
u.MemWrite(args[0], tmp)
writeAddr(u, args[2], args[1])
}
u.RegWrite(uc.X86_REG_EAX, ret)
}
func TestMonitorAndParseRIB(t *testing.T) {
if testing.Short() || os.Getuid() != 0 {
t.Skip("must be root")
}
// We suppose that using an IPv4 link-local address and the
// dot1Q ID for Token Ring and FDDI doesn't harm anyone.
pv := &propVirtual{addr: "169.254.0.1", mask: "255.255.255.0"}
if err := pv.configure(1002); err != nil {
t.Skip(err)
}
if err := pv.setup(); err != nil {
t.Skip(err)
}
pv.teardown()
s, err := syscall.Socket(syscall.AF_ROUTE, syscall.SOCK_RAW, syscall.AF_UNSPEC)
if err != nil {
t.Fatal(err)
}
defer syscall.Close(s)
go func() {
b := make([]byte, os.Getpagesize())
for {
n, err := syscall.Read(s, b)
if err != nil {
return
}
ms, err := ParseRIB(0, b[:n])
if err != nil {
t.Error(err)
return
}
ss, err := msgs(ms).validate()
if err != nil {
t.Error(err)
return
}
for _, s := range ss {
t.Log(s)
}
}
}()
for _, vid := range []int{1002, 1003, 1004, 1005} {
pv := &propVirtual{addr: "169.254.0.1", mask: "255.255.255.0"}
if err := pv.configure(vid); err != nil {
t.Fatal(err)
}
if err := pv.setup(); err != nil {
t.Fatal(err)
}
time.Sleep(200 * time.Millisecond)
if err := pv.teardown(); err != nil {
t.Fatal(err)
}
time.Sleep(200 * time.Millisecond)
}
}
// read reads events from an inotify file descriptor. It does not handle errors
// returned from read(2) function since they are not critical to watcher logic.
func (i *inotify) read() (es []*event) {
n, err := syscall.Read(int(i.fd), i.buffer[:])
if err != nil || n < syscall.SizeofInotifyEvent {
return
}
var sys *syscall.InotifyEvent
nmin := n - syscall.SizeofInotifyEvent
for pos, path := 0, ""; pos <= nmin; {
sys = (*syscall.InotifyEvent)(unsafe.Pointer(&i.buffer[pos]))
pos += syscall.SizeofInotifyEvent
if path = ""; sys.Len > 0 {
endpos := pos + int(sys.Len)
path = string(bytes.TrimRight(i.buffer[pos:endpos], "\x00"))
pos = endpos
}
es = append(es, &event{
sys: syscall.InotifyEvent{
Wd: sys.Wd,
Mask: sys.Mask,
Cookie: sys.Cookie,
},
path: path,
})
}
return
}
func (fd *netFD) Read(p []byte) (n int, err error) {
fd.rio.Lock()
defer fd.rio.Unlock()
if err := fd.incref(false); err != nil {
return 0, err
}
defer fd.decref()
for {
if fd.rdeadline.expired() {
err = errTimeout
break
}
n, err = syscall.Read(int(fd.sysfd), p)
if err != nil {
n = 0
if err == syscall.EAGAIN {
if err = fd.pollServer.WaitRead(fd); err == nil {
continue
}
}
}
err = chkReadErr(n, err, fd)
break
}
if err != nil && err != io.EOF {
err = &OpError{"read", fd.net, fd.raddr, err}
}
return
}
/*
c.sa = new(syscall.SockaddrInet4)
c.sa.Addr = [4]byte{10, 1, 1, 131}
c.sa.Port = port
*/
func (c *Worker) socket() {
begin := time.Now()
s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
if err != nil {
syscall.Close(s)
return
}
err = syscall.Connect(s, nil) //TODO
if err != nil {
lg(err)
syscall.Close(s)
return
}
_, err = syscall.Write(s, message.content)
if err != nil {
syscall.Close(s)
return
}
_, err = syscall.Read(s, c.data)
if err != nil {
syscall.Close(s)
return
}
syscall.Close(s)
time.Now().Sub(begin)
}
func (fdr fdReader) Read(p []byte) (int, error) {
n, e := syscall.Read(int(fdr), p)
if n < 0 {
n = 0
}
return n, e
}
// readEvents reads from the inotify file descriptor, converts the
// received events into Event objects and sends them via the Event channel
func (w *Watcher) readEvents() {
var (
buf [syscall.SizeofInotifyEvent * 4096]byte // Buffer for a maximum of 4096 raw events
n int // Number of bytes read with read()
errno int // Syscall errno
)
for {
n, errno = syscall.Read(w.fd, buf[0:])
// See if there is a message on the "done" channel
_, done := <-w.done
// If EOF or a "done" message is received
if n == 0 || done {
errno := syscall.Close(w.fd)
if errno == -1 {
w.Error <- os.NewSyscallError("close", errno)
}
close(w.Event)
close(w.Error)
return
}
if n < 0 {
w.Error <- os.NewSyscallError("read", errno)
continue
}
if n < syscall.SizeofInotifyEvent {
w.Error <- os.NewError("inotify: short read in readEvents()")
continue
}
var offset uint32 = 0
// We don't know how many events we just read into the buffer
// While the offset points to at least one whole event...
for offset <= uint32(n-syscall.SizeofInotifyEvent) {
// Point "raw" to the event in the buffer
raw := (*syscall.InotifyEvent)(unsafe.Pointer(&buf[offset]))
event := new(Event)
event.Mask = uint32(raw.Mask)
event.Cookie = uint32(raw.Cookie)
nameLen := uint32(raw.Len)
// If the event happened to the watched directory or the watched file, the kernel
// doesn't append the filename to the event, but we would like to always fill the
// the "Name" field with a valid filename. We retrieve the path of the watch from
// the "paths" map.
event.Name = w.paths[int(raw.Wd)]
if nameLen > 0 {
// Point "bytes" at the first byte of the filename
bytes := (*[syscall.PathMax]byte)(unsafe.Pointer(&buf[offset+syscall.SizeofInotifyEvent]))
// The filename is padded with NUL bytes. TrimRight() gets rid of those.
event.Name += "/" + strings.TrimRight(string(bytes[0:nameLen]), "\000")
}
// Send the event on the events channel
w.Event <- event
// Move to the next event in the buffer
offset += syscall.SizeofInotifyEvent + nameLen
}
}
}
func (b *BPFSniffer) ReadPacketData() ([]byte, gopacket.CaptureInfo, error) {
var err error
if b.readBytesConsumed >= b.lastReadLen {
b.readBytesConsumed = 0
b.readBuffer = make([]byte, b.options.ReadBufLen)
b.lastReadLen, err = syscall.Read(b.fd, b.readBuffer)
if err != nil {
b.lastReadLen = 0
return nil, gopacket.CaptureInfo{}, err
}
}
hdr := (*unix.BpfHdr)(unsafe.Pointer(&b.readBuffer[b.readBytesConsumed]))
frameStart := b.readBytesConsumed + int(hdr.Hdrlen)
b.readBytesConsumed += bpfWordAlign(int(hdr.Hdrlen) + int(hdr.Caplen))
if frameStart+int(hdr.Caplen) > len(b.readBuffer) {
captureInfo := gopacket.CaptureInfo{
Timestamp: time.Unix(int64(hdr.Tstamp.Sec), int64(hdr.Tstamp.Usec)*1000),
CaptureLength: 0,
Length: 0,
}
return nil, captureInfo, fmt.Errorf("BPF captured frame received with corrupted BpfHdr struct.")
}
rawFrame := b.readBuffer[frameStart : frameStart+int(hdr.Caplen)]
captureInfo := gopacket.CaptureInfo{
Timestamp: time.Unix(int64(hdr.Tstamp.Sec), int64(hdr.Tstamp.Usec)*1000),
CaptureLength: len(rawFrame),
Length: len(rawFrame),
}
return rawFrame, captureInfo, nil
}
/* Read events from Eventfd. p should be at max 8 bytes.
* Returns the number of read bytes or 0 and error is set.
*/
func (e *EventFD) Read(p []byte) (int, error) {
n, err := syscall.Read(e.fd, p[:])
if err != nil {
return 0, err
}
return n, nil
}
func kmemleakScan(report bool) {
fd, err := syscall.Open("/sys/kernel/debug/kmemleak", syscall.O_RDWR, 0)
if err != nil {
panic(err)
}
defer syscall.Close(fd)
if _, err := syscall.Write(fd, []byte("scan")); err != nil {
panic(err)
}
if report {
if kmemleakBuf == nil {
kmemleakBuf = make([]byte, 128<<10)
}
n, err := syscall.Read(fd, kmemleakBuf)
if err != nil {
panic(err)
}
if n != 0 {
// BUG in output should be recognized by manager.
logf(0, "BUG: memory leak:\n%s\n", kmemleakBuf[:n])
}
}
if _, err := syscall.Write(fd, []byte("clear")); err != nil {
panic(err)
}
}
func (fd *netFD) Read(p []byte) (n int, err error) {
if fd == nil {
return 0, os.EINVAL
}
fd.rio.Lock()
defer fd.rio.Unlock()
fd.incref()
defer fd.decref()
if fd.sysfile == nil {
return 0, os.EINVAL
}
for {
n, err = syscall.Read(fd.sysfile.Fd(), p)
if err == syscall.EAGAIN {
if fd.rdeadline >= 0 {
pollserver.WaitRead(fd)
continue
}
err = errTimeout
}
if err != nil {
n = 0
} else if n == 0 && err == nil && fd.sotype != syscall.SOCK_DGRAM {
err = io.EOF
}
break
}
if err != nil && err != io.EOF {
err = &OpError{"read", fd.net, fd.raddr, err}
}
return
}
func (fd *netFD) Read(p []byte) (n int, err error) {
if err := fd.readLock(); err != nil {
return 0, err
}
defer fd.readUnlock()
if err := fd.pd.PrepareRead(); err != nil {
return 0, &OpError{"read", fd.net, fd.raddr, err}
}
for {
n, err = syscall.Read(int(fd.sysfd), p)
if err != nil {
n = 0
if err == syscall.EAGAIN {
if err = fd.pd.WaitRead(); err == nil {
continue
}
}
}
err = chkReadErr(n, err, fd)
break
}
if err != nil && err != io.EOF {
err = &OpError{"read", fd.net, fd.raddr, err}
}
return
}
func REPL(handler ReplHandler) error {
var err error
input = make(chan byte, 1)
go func() {
var ch [1]byte
for {
n, err := syscall.Read(syscall.Stdin, ch[:])
if err != nil || n == 0 {
panic("Problem reading stdin")
} else {
input <- ch[0]
if ch[0] == 0 {
return
}
}
}
}()
state, err = MakeCbreak(syscall.Stdin)
if err == nil {
defer Restore(syscall.Stdin, state)
err = repl(handler)
return err
} else {
return err
}
}