func newPollServer() (s *pollServer, err error) {
s = new(pollServer)
if s.pr, s.pw, err = os.Pipe(); err != nil {
return nil, err
}
if err = syscall.SetNonblock(int(s.pr.Fd()), true); err != nil {
goto Errno
}
if err = syscall.SetNonblock(int(s.pw.Fd()), true); err != nil {
goto Errno
}
if s.poll, err = newpollster(); err != nil {
goto Error
}
if _, err = s.poll.AddFD(int(s.pr.Fd()), 'r', true); err != nil {
s.poll.Close()
goto Error
}
s.pending = make(map[int]*pollDesc)
go s.Run()
return s, nil
Errno:
err = &os.PathError{
Op: "setnonblock",
Path: s.pr.Name(),
Err: err,
}
Error:
s.pr.Close()
s.pw.Close()
return nil, err
}
func (sc *selectCtx) Init() error {
sc.rset.Zero()
sc.wset.Zero()
sc.fdmax = -1
// Create and configure the pipe-ends.
b := make([]int, 2)
err := syscall.Pipe(b)
if err != nil {
return err
}
sc.pfdr, sc.pfdw = b[0], b[1]
syscall.CloseOnExec(sc.pfdr)
syscall.CloseOnExec(sc.pfdw)
err = syscall.SetNonblock(sc.pfdr, true)
if err != nil {
syscall.Close(sc.pfdr)
syscall.Close(sc.pfdw)
return err
}
err = syscall.SetNonblock(sc.pfdw, true)
if err != nil {
syscall.Close(sc.pfdr)
syscall.Close(sc.pfdw)
return err
}
// pfdr (read-end of pipe) is set (and remains set forever) on
// rset.
sc.rset.Set(sc.pfdr)
sc.fdmax = sc.pfdr
// allocate dummy selectCtx.{b,b1} buffers.
sc.b = make([]byte, 1)
sc.b1 = make([]byte, 128)
return nil
}
func (t *pty) open(cols, rows int) error {
var winp = new(C.struct_winsize)
winp.ws_col = C.ushort(cols)
winp.ws_row = C.ushort(rows)
winp.ws_xpixel = 0
winp.ws_ypixel = 0
var master, slave C.int
var name = make([]C.char, 40)
if ret := int(C.GoOpenpty(&master, &slave, &name[0], winp)); ret == -1 {
return errors.New("openpty(3) failed")
}
t.master = int(master)
t.slave = int(slave)
t.pty = C.GoString(&name[0])
if err := syscall.SetNonblock(t.master, true); err != nil {
return err
}
if err := syscall.SetNonblock(t.slave, true); err != nil {
return err
}
return nil
}
func newPollServer() (s *pollServer, err os.Error) {
s = new(pollServer)
s.cr = make(chan *netFD, 1)
s.cw = make(chan *netFD, 1)
if s.pr, s.pw, err = os.Pipe(); err != nil {
return nil, err
}
var e int
if e = syscall.SetNonblock(s.pr.Fd(), true); e != 0 {
goto Errno
}
if e = syscall.SetNonblock(s.pw.Fd(), true); e != 0 {
goto Errno
}
if s.poll, err = newpollster(); err != nil {
goto Error
}
if _, err = s.poll.AddFD(s.pr.Fd(), 'r', true); err != nil {
s.poll.Close()
goto Error
}
s.pending = make(map[int]*netFD)
go s.Run()
return s, nil
Errno:
err = &os.PathError{"setnonblock", s.pr.Name(), os.Errno(e)}
Error:
s.pr.Close()
s.pw.Close()
return nil, err
}
func (io *NetIOManager) ProxyNetAccept(serverinfo syscall.Sockaddr) (sa syscall.Sockaddr, err error) {
var clientfd, serverfd int
// accpet mongodb client connection request
clientfd, clientinfo, err := syscall.Accept(io.proxy_server_fd)
if err != nil {
goto ClientError
}
err = syscall.SetNonblock(clientfd, true)
if err != nil {
goto ClientCleanup
}
err = syscall.EpollCtl(io.epoll_fd, syscall.EPOLL_CTL_ADD, clientfd,
&syscall.EpollEvent{Events: syscall.EPOLLIN | syscall.EPOLLOUT |
syscall.EPOLLRDHUP, Fd: int32(clientfd)})
if err != nil {
goto ClientCleanup
}
// establish connection with mongodb server
serverfd, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM,
syscall.IPPROTO_TCP)
if err != nil {
goto ServerError
}
err = syscall.Connect(serverfd, serverinfo)
if err != nil {
goto ServerCleanup
}
err = syscall.SetNonblock(serverfd, true)
if err != nil {
goto ServerCleanup
}
err = syscall.EpollCtl(io.epoll_fd, syscall.EPOLL_CTL_ADD, serverfd,
&syscall.EpollEvent{Events: syscall.EPOLLIN | syscall.EPOLLOUT |
syscall.EPOLLRDHUP, Fd: int32(serverfd)})
if err != nil {
goto ServerCleanup
}
// now proxy server becomes a bridge between client <-> server
add_sock_peer(io, clientfd, clientinfo, serverfd, serverinfo)
return clientinfo, nil
ServerCleanup:
syscall.Close(serverfd)
ServerError:
syscall.EpollCtl(io.epoll_fd, syscall.EPOLL_CTL_DEL, clientfd,
&syscall.EpollEvent{Events: syscall.EPOLLIN | syscall.EPOLLOUT |
syscall.EPOLLRDHUP, Fd: int32(clientfd)})
ClientCleanup:
syscall.Close(clientfd)
ClientError:
return nil, err
}
func (p *pin) BeginWatch(edge Edge, callback IRQEvent) error {
p.SetMode(ModeInput)
if err := write([]byte(edge), p.edgePath); err != nil {
return err
}
var event syscall.EpollEvent
event.Events = syscall.EPOLLIN | (syscall.EPOLLET & 0xffffffff) | syscall.EPOLLPRI
fd := int(p.valueFile.Fd())
p.callback = callback
watchEventCallbacks[fd] = p
if err := syscall.SetNonblock(fd, true); err != nil {
return err
}
event.Fd = int32(fd)
if err := syscall.EpollCtl(epollFD, syscall.EPOLL_CTL_ADD, fd, &event); err != nil {
return err
}
return nil
}
func newPollServer() (s *pollServer, err os.Error) {
s = new(pollServer)
s.cr = make(chan *netFD, 1)
s.cw = make(chan *netFD, 1)
// s.pr and s.pw are indistinguishable.
if s.pr, s.pw, err = selfConnectedTCPSocket(); err != nil {
return nil, err
}
var e int
if e = syscall.SetNonblock(s.pr.Fd(), true); e != 0 {
Errno:
err = &os.PathError{"setnonblock", s.pr.Name(), os.Errno(e)}
Error:
s.pr.Close()
return nil, err
}
if s.poll, err = newpollster(); err != nil {
goto Error
}
if _, err = s.poll.AddFD(s.pr.Fd(), 'r', true); err != nil {
s.poll.Close()
goto Error
}
s.pending = make(map[int]*netFD)
go s.Run()
return s, nil
}
// Wrapper around the accept system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func accept(fd int) (int, syscall.Sockaddr, error) {
nfd, sa, err := syscall.Accept4(fd, syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC)
// The accept4 system call was introduced in Linux 2.6.28. If
// we get an ENOSYS error, fall back to using accept.
if err == nil || err != syscall.ENOSYS {
return nfd, sa, err
}
// See ../syscall/exec_unix.go for description of ForkLock.
// It is okay to hold the lock across syscall.Accept
// because we have put fd.sysfd into non-blocking mode.
syscall.ForkLock.RLock()
nfd, sa, err = syscall.Accept(fd)
if err == nil {
syscall.CloseOnExec(nfd)
}
syscall.ForkLock.RUnlock()
if err != nil {
return -1, nil, err
}
if err = syscall.SetNonblock(nfd, true); err != nil {
syscall.Close(nfd)
return -1, nil, err
}
return nfd, sa, nil
}
// Open opens an asynchronous communications port.
func Open(name string, options ...func(*Term) error) (*Term, error) {
fd, e := syscall.Open(name, syscall.O_NOCTTY|syscall.O_CLOEXEC|syscall.O_NDELAY|syscall.O_RDWR, 0666)
if e != nil {
return nil, &os.PathError{"open", name, e}
}
modules := [2]string{"ptem", "ldterm"}
for _, mod := range modules {
err := unix.IoctlSetInt(fd, C.I_PUSH, int(uintptr(unsafe.Pointer(syscall.StringBytePtr(mod)))))
if err != nil {
return nil, err
}
}
t := Term{name: name, fd: fd}
termios.Tcgetattr(uintptr(t.fd), &t.orig)
if err := termios.Tcgetattr(uintptr(t.fd), &t.orig); err != nil {
return nil, err
}
if err := t.SetOption(options...); err != nil {
return nil, err
}
return &t, syscall.SetNonblock(t.fd, false)
}
// Remove a reference to this FD and close if we've been asked to do so (and
// there are no references left.
func (fd *netFD) decref() {
fd.sysmu.Lock()
fd.sysref--
// NOTE(rsc): On Unix we check fd.sysref == 0 here before closing,
// but on Windows we have no way to wake up the blocked I/O other
// than closing the socket (or calling Shutdown, which breaks other
// programs that might have a reference to the socket). So there is
// a small race here that we might close fd.sysfd and then some other
// goroutine might start a read of fd.sysfd (having read it before we
// write InvalidHandle to it), which might refer to some other file
// if the specific handle value gets reused. I think handle values on
// Windows are not reused as aggressively as file descriptors on Unix,
// so this might be tolerable.
if fd.closing && fd.sysfd != syscall.InvalidHandle {
// In case the user has set linger, switch to blocking mode so
// the close blocks. As long as this doesn't happen often, we
// can handle the extra OS processes. Otherwise we'll need to
// use the resultsrv for Close too. Sigh.
syscall.SetNonblock(fd.sysfd, false)
closesocket(fd.sysfd)
fd.sysfd = syscall.InvalidHandle
// no need for a finalizer anymore
runtime.SetFinalizer(fd, nil)
}
fd.sysmu.Unlock()
}
func newFD(sysfd int) (*FD, error) {
// Set sysfd to non-blocking mode
err := syscall.SetNonblock(sysfd, true)
if err != nil {
debugf("FD %03d: NF: SetNonBlock: %s", sysfd, err.Error())
return nil, err
}
// Check if sysfd is select-able
// NOTE(npat): Is this useful? Can it ever fail?
var rs fdSet
var tv syscall.Timeval
rs.Zero()
rs.Set(sysfd)
_, err = uxSelect(sysfd+1, &rs, nil, nil, &tv)
if err != nil {
debugf("FD %03d: NF: select(2): %s", sysfd, err.Error())
return nil, err
}
// Initialize FD. We don't generate arbitrary ids, instead we
// use sysfd as the fdMap id. In effect, fd.id is alays ==
// fd.sysfd. Remember that sysfd's can be reused; we must be
// carefull not to allow this to mess things up.
fd := &FD{id: sysfd, sysfd: sysfd}
fd.r.cond = sync.NewCond(&fd.r.mu)
fd.w.cond = sync.NewCond(&fd.w.mu)
// Add to fdMap
fdM.AddFD(fd)
debugf("FD %03d: NF: Ok", fd.id)
return fd, nil
}
// Wrapper around the socket system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) { // 创建socket套接字
s, err := socketFunc(family, sotype|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, proto)
// On Linux the SOCK_NONBLOCK and SOCK_CLOEXEC flags were
// introduced in 2.6.27 kernel and on FreeBSD both flags were
// introduced in 10 kernel. If we get an EINVAL error on Linux
// or EPROTONOSUPPORT error on FreeBSD, fall back to using
// socket without them.
switch err {
case nil:
return s, nil
default:
return -1, os.NewSyscallError("socket", err)
case syscall.EPROTONOSUPPORT, syscall.EINVAL:
}
// See ../syscall/exec_unix.go for description of ForkLock.
syscall.ForkLock.RLock()
s, err = socketFunc(family, sotype, proto)
if err == nil {
syscall.CloseOnExec(s)
}
syscall.ForkLock.RUnlock()
if err != nil {
return -1, os.NewSyscallError("socket", err)
}
if err = syscall.SetNonblock(s, true); err != nil {
closeFunc(s)
return -1, os.NewSyscallError("setnonblock", err)
}
return s, nil
}
func newFD(sysfd int) (*FD, error) {
// Set sysfd to non-blocking mode
err := syscall.SetNonblock(sysfd, true)
if err != nil {
debugf("FD xxx: NF: sysfd=%d, err=%v", sysfd, err)
return nil, err
}
// Initialize FD
fd := &FD{sysfd: sysfd}
fd.id = fdM.GetID()
fd.r.cond = sync.NewCond(&fd.r.mu)
fd.w.cond = sync.NewCond(&fd.w.mu)
// Add to Epoll set. We may imediatelly start receiving events
// after this. They will be dropped since the FD is not yet in
// fdMap. It's ok. Nobody is waiting on this FD yet, anyway.
ev := syscall.EpollEvent{
Events: syscall.EPOLLIN |
syscall.EPOLLOUT |
syscall.EPOLLRDHUP |
(syscall.EPOLLET & 0xffffffff),
Fd: int32(fd.id)}
err = syscall.EpollCtl(epfd, syscall.EPOLL_CTL_ADD, fd.sysfd, &ev)
if err != nil {
debugf("FD %03d: NF: sysfd=%d, err=%v", fd.id, fd.sysfd, err)
return nil, err
}
// Add to fdMap
fdM.AddFD(fd)
debugf("FD %03d: NF: sysfd=%d", fd.id, fd.sysfd)
return fd, nil
}
func (c *Connection) setBaudRate(rate uint32) error {
// Create the term IO settings structure
term := syscall.Termios{
Iflag: syscall.IGNPAR,
Cflag: syscall.CS8 | syscall.CREAD | syscall.CLOCAL | rate,
Cc: [32]uint8{syscall.VMIN: 0, syscall.VTIME: getVtime(connectionTimeout)},
Ispeed: rate,
Ospeed: rate,
}
// Make the IOCTL system call to configure the term
if _, _, errno := syscall.Syscall(
syscall.SYS_IOCTL,
uintptr(c.file.Fd()),
uintptr(syscall.TCSETS),
uintptr(unsafe.Pointer(&term)),
); errno != 0 {
// TODO: include errno in this
return errors.New("Encountered error doing IOCTL syscall")
}
if err := syscall.SetNonblock(int(c.file.Fd()), false); err != nil {
return err
}
return nil
}
func newFakeVTYServer() (*fakeVTYServer, error) {
fds, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
if err != nil {
return nil, err
}
vtyClientFile := os.NewFile(uintptr(fds[1]), "vty-client")
vtyClientConn, err := net.FileConn(vtyClientFile)
if err != nil {
return nil, err
}
vtyServerFile := os.NewFile(uintptr(fds[0]), "vty-server")
vtyServerConn, err := net.FileConn(vtyServerFile)
if err != nil {
return nil, err
}
syscall.SetNonblock(fds[0], false)
vs := &fakeVTYServer{
clientConn: vtyClientConn,
serverConn: vtyServerConn,
clientFile: vtyClientFile,
serverFile: vtyServerFile,
send: make(chan []byte),
received: make(chan []byte),
}
go vs.read()
go vs.write()
return vs, nil
}
func NonblockReadFile(filename string) {
// open input file
fi, err := os.Open(filename)
if err != nil {
panic(err)
}
// close fi on exit and check for its returned error
defer func() {
if err := fi.Close(); err != nil {
panic(err)
}
}()
syscall.SetNonblock(int(fi.Fd()), true)
// make a read buffer
r := bufio.NewReader(fi)
for {
// read a chunk
line, _, err := r.ReadLine()
fmt.Println(line)
if err == io.EOF {
// do something here
fmt.Println("It is end of file")
break
} else if err != nil {
panic(err)
}
}
}
// Wrapper around the accept system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func accept(s int) (int, syscall.Sockaddr, error) {
ns, sa, err := accept4Func(s, syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC)
// On Linux the accept4 system call was introduced in 2.6.28
// kernel and on FreeBSD it was introduced in 10 kernel. If we
// get an ENOSYS error on both Linux and FreeBSD, or EINVAL
// error on Linux, fall back to using accept.
switch err {
default: // nil and errors other than the ones listed
return ns, sa, err
case syscall.ENOSYS: // syscall missing
case syscall.EINVAL: // some Linux use this instead of ENOSYS
case syscall.EACCES: // some Linux use this instead of ENOSYS
case syscall.EFAULT: // some Linux use this instead of ENOSYS
}
// See ../syscall/exec_unix.go for description of ForkLock.
// It is probably okay to hold the lock across syscall.Accept
// because we have put fd.sysfd into non-blocking mode.
// However, a call to the File method will put it back into
// blocking mode. We can't take that risk, so no use of ForkLock here.
ns, sa, err = acceptFunc(s)
if err == nil {
syscall.CloseOnExec(ns)
}
if err != nil {
return -1, nil, err
}
if err = syscall.SetNonblock(ns, true); err != nil {
closeFunc(ns)
return -1, nil, err
}
return ns, sa, nil
}
// Wrapper around the accept system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func accept(s int) (int, syscall.Sockaddr, error) {
ns, sa, err := syscall.Accept4(s, syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC)
// On Linux the accept4 system call was introduced in 2.6.28
// kernel and on FreeBSD it was introduced in 10 kernel. If we
// get an ENOSYS error on both Linux and FreeBSD, or EINVAL
// error on Linux, fall back to using accept.
if err == nil || (err != syscall.ENOSYS && err != syscall.EINVAL) {
return ns, sa, err
}
// See ../syscall/exec_unix.go for description of ForkLock.
// It is probably okay to hold the lock across syscall.Accept
// because we have put fd.sysfd into non-blocking mode.
// However, a call to the File method will put it back into
// blocking mode. We can't take that risk, so no use of ForkLock here.
ns, sa, err = syscall.Accept(s)
if err == nil {
syscall.CloseOnExec(ns)
}
if err != nil {
return -1, nil, err
}
if err = syscall.SetNonblock(ns, true); err != nil {
syscall.Close(ns)
return -1, nil, err
}
return ns, sa, nil
}
func registerInterrupt(pin *digitalPin, handler func(embd.DigitalPin)) error {
l := getEpollListenerInstance()
pinFd := int(pin.val.Fd())
l.mu.Lock()
defer l.mu.Unlock()
if _, ok := l.interruptablePins[pinFd]; ok {
return ErrorPinAlreadyRegistered
}
var event syscall.EpollEvent
event.Events = syscall.EPOLLIN | (syscall.EPOLLET & 0xffffffff) | syscall.EPOLLPRI
if err := syscall.SetNonblock(pinFd, true); err != nil {
return err
}
event.Fd = int32(pinFd)
if err := syscall.EpollCtl(l.fd, syscall.EPOLL_CTL_ADD, pinFd, &event); err != nil {
return err
}
l.interruptablePins[pinFd] = &interrupt{pin: pin, handler: handler}
return nil
}
// Wrapper around the socket system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func sysSocket(f, t, p int) (int, error) {
s, err := syscall.Socket(f, t|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, p)
// The SOCK_NONBLOCK and SOCK_CLOEXEC flags were introduced in
// Linux 2.6.27. If we get an EINVAL error, fall back to
// using socket without them.
if err == nil || err != syscall.EINVAL {
return s, err
}
// See ../syscall/exec_unix.go for description of ForkLock.
syscall.ForkLock.RLock()
s, err = syscall.Socket(f, t, p)
if err == nil {
syscall.CloseOnExec(s)
}
syscall.ForkLock.RUnlock()
if err != nil {
return -1, err
}
if err = syscall.SetNonblock(s, true); err != nil {
syscall.Close(s)
return -1, err
}
return s, nil
}
// Wrapper around the accept system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func accept(fd int) (int, syscall.Sockaddr, error) {
nfd, sa, err := syscall.Accept4(fd, syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC)
// The accept4 system call was introduced in Linux 2.6.28. If
// we get an ENOSYS error, fall back to using accept.
if err == nil || err != syscall.ENOSYS {
return nfd, sa, err
}
// See ../syscall/exec_unix.go for description of ForkLock.
// It is probably okay to hold the lock across syscall.Accept
// because we have put fd.sysfd into non-blocking mode.
// However, a call to the File method will put it back into
// blocking mode. We can't take that risk, so no use of ForkLock here.
nfd, sa, err = syscall.Accept(fd)
if err == nil {
syscall.CloseOnExec(nfd)
}
if err != nil {
return -1, nil, err
}
if err = syscall.SetNonblock(nfd, true); err != nil {
syscall.Close(nfd)
return -1, nil, err
}
return nfd, sa, nil
}
func NewGTKUI() *GTKUI {
gtk.Init(nil)
window := gtk.Window(gtk.GTK_WINDOW_TOPLEVEL)
window.SetPosition(gtk.GTK_WIN_POS_CENTER)
window.SetTitle("Pond")
window.SetDefaultSize(1000, 800)
ui := >KUI{
window: window,
actions: make(chan interface{}, uiActionsQueueLen),
events: make(chan interface{}, 8),
}
window.Connect("destroy", func(ctx *glib.CallbackContext) {
close(ui.events)
for {
if _, ok := <-ui.actions; !ok {
break
}
}
gtk.MainQuit()
})
if err := syscall.Pipe(ui.pipe[:]); err != nil {
panic(err)
}
syscall.SetNonblock(ui.pipe[0], true)
glib.FdWatchAdd(ui.pipe[0], glib.IOIn, func(conditions int) bool {
ui.onAction()
return true
})
return ui
}
func newFD(fd, family, proto int, net string, laddr, raddr Addr) (f *netFD, err os.Error) {
once.Do(startServer)
if e := syscall.SetNonblock(fd, true); e != 0 {
return nil, &OpError{"setnonblock", net, laddr, os.Errno(e)}
}
f = &netFD{
sysfd: fd,
family: family,
proto: proto,
net: net,
laddr: laddr,
raddr: raddr,
}
var ls, rs string
if laddr != nil {
ls = laddr.String()
}
if raddr != nil {
rs = raddr.String()
}
f.sysfile = os.NewFile(fd, net+":"+ls+"->"+rs)
f.cr = make(chan bool, 1)
f.cw = make(chan bool, 1)
return f, nil
}
// NOTE: Taken from the Go source: src/net/sock_cloexec.go
// Wrapper around the socket system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) {
s, err := syscall.Socket(family, sotype|syscall.SOCK_CLOEXEC, proto)
// On Linux the SOCK_NONBLOCK and SOCK_CLOEXEC flags were
// introduced in 2.6.27 kernel and on FreeBSD both flags were
// introduced in 10 kernel. If we get an EINVAL error on Linux
// or EPROTONOSUPPORT error on FreeBSD, fall back to using
// socket without them.
if err == nil || (err != syscall.EPROTONOSUPPORT && err != syscall.EINVAL) {
return s, err
}
// See ../syscall/exec_unix.go for description of ForkLock.
syscall.ForkLock.RLock()
s, err = syscall.Socket(family, sotype, proto)
if err == nil {
syscall.CloseOnExec(s)
}
syscall.ForkLock.RUnlock()
if err != nil {
return -1, err
}
if err = syscall.SetNonblock(s, true); err != nil {
syscall.Close(s)
return -1, err
}
return s, nil
}
func getch(nonblock bool) int {
b := make([]byte, 1)
syscall.SetNonblock(int(_in.Fd()), nonblock)
_, err := _in.Read(b)
if err != nil {
return -1
}
return int(b[0])
}
func newFD(fd int) (*fileFD, error) {
if err := syscall.SetNonblock(fd, true); err != nil {
return nil, err
}
ffd := &fileFD{
sysfd: fd,
}
return ffd, nil
}
/*-----------------------------------------------------------------------------
-- FUNCTION: newConnection
--
-- DATE: February 6, 2016
--
-- REVISIONS: February 10, 2016 - modified for EPoll
-- February 11, 2016 - fixed blocking issues
-- February 12, 2016 - factored out hostString()
--
--
-- DESIGNER: Marc Vouve
--
-- PROGRAMMER: Marc Vouve
--
-- INTERFACE: func newConnection(listenFd int) (connectionInfo, error)
-- listenFd: the listener file descriptor with the new connection
--
-- RETURNS:
-- connectionInfo: A structor to store data over the life of the connection
-- error: If an error occurs
--
-- NOTES: this function sets the port into non blocking mode.
------------------------------------------------------------------------------*/
func newConnection(listenFd int) (connectionInfo, error) {
newFileDescriptor, socketAddr, err := syscall.Accept(int(listenFd))
if err != nil {
return connectionInfo{}, err
}
syscall.SetNonblock(newFileDescriptor, true)
hostName := hostString(socketAddr)
return connectionInfo{FileDescriptor: newFileDescriptor, HostName: hostName}, nil
}
func openNonBlocking(fileName string) (*os.File, error) {
file, err := os.OpenFile(fileName, os.O_RDONLY|syscall.O_NONBLOCK, 0600)
if err != nil {
return nil, err
}
if err = syscall.SetNonblock(int(file.Fd()), false); err != nil {
return nil, err
}
return file, nil
}
func setSockopts(fd int) error {
err := syscall.SetNonblock(fd, true)
if err != nil {
return err
}
linger := syscall.Linger{Onoff: 1, Linger: 0}
syscall.SetsockoptLinger(fd, syscall.SOL_SOCKET, syscall.SO_LINGER, &linger)
return syscall.SetsockoptInt(fd, syscall.SOL_TCP, syscall.TCP_QUICKACK, 0)
}
func dupSocket(f *os.File) (int, error) {
s, err := dupCloseOnExec(int(f.Fd()))
if err != nil {
return -1, err
}
if err := syscall.SetNonblock(s, true); err != nil {
closeFunc(s)
return -1, os.NewSyscallError("setnonblock", err)
}
return s, nil
}