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 (s *cScreen) Init() error {
s.evch = make(chan Event, 2)
s.quit = make(chan struct{})
if in, e := syscall.Open("CONIN$", syscall.O_RDWR, 0); e != nil {
return e
} else {
s.in = in
}
if out, e := syscall.Open("CONOUT$", syscall.O_RDWR, 0); e != nil {
syscall.Close(s.in)
return e
} else {
s.out = out
}
s.curx = -1
s.cury = -1
s.getCursorInfo(&s.ocursor)
s.getConsoleInfo(&s.oscreen)
s.getOutMode(&s.oomode)
s.getInMode(&s.oimode)
s.resize()
s.setInMode(modeResizeEn)
s.setOutMode(0)
s.clearScreen(s.style)
s.hideCursor()
go s.scanInput()
return nil
}
func afs_syscall(call uintptr, param1 uintptr, param2 uintptr, param3 uintptr, param4 uintptr) error {
fd, err := syscall.Open("/proc/fs/openafs/afs_ioctl", syscall.O_RDWR, 0)
if err != nil {
fd, err = syscall.Open("/proc/fs/nnpfs/afs_ioctl", syscall.O_RDWR, 0)
}
if err != nil {
return err
}
data := afsprocdata{
param4,
param3,
param2,
param1,
call,
}
err = gioctl.Ioctl(uintptr(fd), gioctl.IoW(67, 1, unsafe.Sizeof(uintptr(0))), uintptr(unsafe.Pointer(&data)))
syscall.Close(fd)
return err
}
func (constor *Constor) Write(input *fuse.WriteIn, data []byte) (written uint32, code fuse.Status) {
constor.log("%d", input.Fh)
ptr := uintptr(input.Fh)
offset := input.Offset
F := constor.getfd(ptr)
if F == nil {
constor.error("F == nil")
return 0, fuse.EIO
}
inode, err := constor.inodemap.findInode(input.NodeId)
if err != nil {
constor.error("%s", err)
return 0, fuse.ToStatus(err)
}
if F.layer != 0 && inode.layer != 0 {
err = constor.copyup(inode)
if err != nil {
constor.error("%s", err)
return 0, fuse.ToStatus(err)
}
path, err := constor.dentrymap.getPath(inode.ino)
if err != nil {
constor.error("%s", err)
return 0, fuse.ToStatus(err)
}
pathl := Path.Join(constor.layers[0], path)
syscall.Close(F.fd)
fd, err := syscall.Open(pathl, F.flags, 0)
if err != nil {
constor.error("%s", err)
return 0, fuse.ToStatus(err)
}
F.fd = fd
F.layer = 0
constor.log("reset fd for %s", path)
} else if F.layer != 0 && inode.layer == 0 {
syscall.Close(F.fd)
path, err := constor.dentrymap.getPath(inode.ino)
if err != nil {
constor.error("%s", err)
return 0, fuse.ToStatus(err)
}
pathl := Path.Join(constor.layers[0] + path)
fd, err := syscall.Open(pathl, F.flags, 0)
if err != nil {
constor.error("%s", err)
return 0, fuse.ToStatus(err)
}
F.fd = fd
F.layer = 0
constor.log("reset fd for %s", path)
}
fd := F.fd
n, err := syscall.Pwrite(fd, data, int64(offset))
return uint32(n), fuse.ToStatus(err)
}
// Initializes termbox library. This function should be called before any other functions.
// After successful initialization, the library must be finalized using 'Close' function.
//
// Example usage:
// err := termbox.Init()
// if err != nil {
// panic(err)
// }
// defer termbox.Close()
func Init() error {
var err error
interrupt, err = create_event()
if err != nil {
return err
}
in, err = syscall.Open("CONIN$", syscall.O_RDWR, 0)
if err != nil {
return err
}
out, err = syscall.Open("CONOUT$", syscall.O_RDWR, 0)
if err != nil {
return err
}
err = get_console_mode(in, &orig_mode)
if err != nil {
return err
}
err = set_console_mode(in, enable_window_input)
if err != nil {
return err
}
orig_size = get_term_size(out)
win_size := get_win_size(out)
err = set_console_screen_buffer_size(out, win_size)
if err != nil {
return err
}
err = get_console_cursor_info(out, &orig_cursor_info)
if err != nil {
return err
}
show_cursor(false)
term_size = get_term_size(out)
back_buffer.init(int(term_size.x), int(term_size.y))
front_buffer.init(int(term_size.x), int(term_size.y))
back_buffer.clear()
front_buffer.clear()
clear()
diffbuf = make([]diff_msg, 0, 32)
go input_event_producer()
IsInit = true
return nil
}
// pivotRoot will call pivot_root such that rootfs becomes the new root
// filesystem, and everything else is cleaned up.
func pivotRoot(rootfs string) error {
// While the documentation may claim otherwise, pivot_root(".", ".") is
// actually valid. What this results in is / being the new root but
// /proc/self/cwd being the old root. Since we can play around with the cwd
// with pivot_root this allows us to pivot without creating directories in
// the rootfs. Shout-outs to the LXC developers for giving us this idea.
oldroot, err := syscall.Open("/", syscall.O_DIRECTORY|syscall.O_RDONLY, 0)
if err != nil {
return err
}
defer syscall.Close(oldroot)
newroot, err := syscall.Open(rootfs, syscall.O_DIRECTORY|syscall.O_RDONLY, 0)
if err != nil {
return err
}
defer syscall.Close(newroot)
// Change to the new root so that the pivot_root actually acts on it.
if err := syscall.Fchdir(newroot); err != nil {
return err
}
if err := syscall.PivotRoot(".", "."); err != nil {
return fmt.Errorf("pivot_root %s", err)
}
// Currently our "." is oldroot (according to the current kernel code).
// However, purely for safety, we will fchdir(oldroot) since there isn't
// really any guarantee from the kernel what /proc/self/cwd will be after a
// pivot_root(2).
if err := syscall.Fchdir(oldroot); err != nil {
return err
}
// Make oldroot rprivate to make sure our unmounts don't propagate to the
// host (and thus bork the machine).
if err := syscall.Mount("", ".", "", syscall.MS_PRIVATE|syscall.MS_REC, ""); err != nil {
return err
}
// Preform the unmount. MNT_DETACH allows us to unmount /proc/self/cwd.
if err := syscall.Unmount(".", syscall.MNT_DETACH); err != nil {
return err
}
// Switch back to our shiny new root.
if err := syscall.Chdir("/"); err != nil {
return fmt.Errorf("chdir / %s", err)
}
return nil
}
func (constor *Constor) Write(input *fuse.WriteIn, data []byte) (written uint32, code fuse.Status) {
constor.log("%d %d", input.Fh, len(data))
ptr := uintptr(input.Fh)
offset := input.Offset
wdata := data
F := constor.getfd(ptr)
if F == nil {
constor.error("F == nil")
return 0, fuse.EIO
}
if F.flags&syscall.O_DIRECT != 0 {
wdata = directio.AlignedBlock(len(data))
copy(wdata, data)
}
inode := constor.inodemap.findInodePtr(input.NodeId)
if inode == nil {
return 0, fuse.ENOENT
}
if F.layer != 0 && inode.layer != 0 {
err := constor.copyup(inode)
if err != nil {
constor.error("%s", err)
return 0, fuse.ToStatus(err)
}
path := constor.getPath(0, inode.id)
syscall.Close(F.fd)
fd, err := syscall.Open(path, F.flags, 0)
if err != nil {
constor.error("%s", err)
return 0, fuse.ToStatus(err)
}
F.fd = fd
F.layer = 0
constor.log("reset fd for %s", path)
} else if F.layer != 0 && inode.layer == 0 {
syscall.Close(F.fd)
path := constor.getPath(0, inode.id)
fd, err := syscall.Open(path, F.flags, 0)
if err != nil {
constor.error("%s", err)
return 0, fuse.ToStatus(err)
}
F.fd = fd
F.layer = 0
constor.log("reset fd for %s", path)
}
fd := F.fd
n, err := syscall.Pwrite(fd, wdata, int64(offset))
return uint32(n), fuse.ToStatus(err)
}
func main() {
var err error
var b []byte
var l uintptr
flag.Parse()
if len(flag.Args()) < 1 {
flag.PrintDefaults()
log.Fatalf("usage: kexec [flags] kernelname")
}
kernel := flag.Args()[0]
if *cmdline != "" {
b = append(b, []byte(*cmdline)...)
l = uintptr(len(b)) + 1
} else {
b, err = ioutil.ReadFile("/proc/cmdline")
if err != nil {
log.Fatalf("%v", err)
}
b[len(b)-1] = 0
l = uintptr(len(b))
}
p := uintptr(unsafe.Pointer(&b[0]))
log.Printf("Loading %v\n", kernel)
if kern, err = syscall.Open(kernel, syscall.O_RDONLY, 0); err != nil {
log.Fatalf("%v", err)
}
if ramfs, err = syscall.Open(*initramfs, syscall.O_RDONLY, 0); err != nil {
flags |= KEXEC_FILE_NO_INITRAMFS
}
log.Printf("command line: '%v'", string(b))
log.Printf("%v %v %v %v %v %v", 320, uintptr(kern), uintptr(ramfs), p, l, flags)
if *dryrun {
log.Printf("Dry run -- exiting now")
return
}
if e1, e2, err := syscall.Syscall6(320, uintptr(kern), uintptr(ramfs), l, p, flags, uintptr(0)); err != 0 {
log.Fatalf("a %v b %v err %v", e1, e2, err)
}
if e1, e2, err := syscall.Syscall6(syscall.SYS_REBOOT, syscall.LINUX_REBOOT_MAGIC1, syscall.LINUX_REBOOT_MAGIC2, syscall.LINUX_REBOOT_CMD_KEXEC, 0, 0, 0); err != 0 {
log.Fatalf("a %v b %v err %v", e1, e2, err)
}
}
func OpenFile(name string, mode int, perm uint32) (file *File, err os.Error) {
r, e := syscall.Open(name, mode, perm)
if e != 0 {
err = os.Errno(e)
}
return newFile(r, name), err
}
// NewLock opens a new lock on a file without acquisition
func NewLock(path string, lockType LockType) (*FileLock, error) {
l := &FileLock{path: path, fd: -1}
mode := syscall.O_RDONLY | syscall.O_CLOEXEC
if lockType == Dir {
mode |= syscall.O_DIRECTORY
}
lfd, err := syscall.Open(l.path, mode, 0)
if err != nil {
if err == syscall.ENOENT {
err = ErrNotExist
} else if err == syscall.EACCES {
err = ErrPermission
}
return nil, err
}
l.fd = lfd
var stat syscall.Stat_t
err = syscall.Fstat(lfd, &stat)
if err != nil {
return nil, err
}
// Check if the file is a regular file
if lockType == RegFile && !(stat.Mode&syscall.S_IFMT == syscall.S_IFREG) {
return nil, ErrNotRegular
}
return l, nil
}
func Open() (*Fifo, error) {
var pipe Fifo
pipe.path = defaultPath
if config.Has("global.fifo") {
pipe.path, _ = config.String("config.fifo")
}
if _, err := os.Stat(pipe.path); err == nil {
err = os.Remove(pipe.path)
if err != nil {
return nil, err
}
}
if err := syscall.Mkfifo(pipe.path, 0777); err != nil {
return nil, err
}
fd, err := syscall.Open(pipe.path, syscall.O_RDONLY|syscall.O_NONBLOCK, 0777)
if err != nil {
return nil, err
}
pipe.fd = fdReader(fd)
pipe.rd = bufio.NewReader(pipe.fd)
pipe.cmds = make([]Command, 0, 5)
return &pipe, nil
}
func init_disk_usage(disk_usage *DiskUsage) bool {
if disk_usage.reserved_blocks == 0 {
disk_usage.reserved_blocks = DEFAULT_FS_RESERVED_BLOCKS
}
disk_usage.total_size = 0
disk_usage.static_size = 0
disk_usage.dynamic_size = 0
disk_usage.ratio = 0.0
base_dir := "/store/instance"
fd, err := syscall.Open(base_dir, syscall.O_RDONLY, 0x664)
if err != nil {
logger.Error("%s does not exist, ignore disk quota filter.", base_dir)
return false
}
defer syscall.Close(fd)
var statfs syscall.Statfs_t
err = syscall.Fstatfs(fd, &statfs)
if err != nil {
logger.Error("Failed to get %s file system stats [%s].", base_dir, err)
return false
}
total_size := uint64(statfs.Bsize) * uint64(float64(statfs.Blocks)*
float64(1.0-disk_usage.reserved_blocks))
logger.Debug("Get total disk size %d.", total_size)
disk_usage.total_size = total_size
return true
}
func NewBone() (Bone, error) {
b, err := syscall.Open("/dev/logibone_mem", syscall.O_RDWR|syscall.O_SYNC, 777)
if err != nil {
return 0, err
}
return Bone(b), nil
}
func openFile(name string, flag int, perm FileMode) (file *File, err error) {
r, e := syscall.Open(name, flag|syscall.O_CLOEXEC, syscallMode(perm))
if e != nil {
return nil, &PathError{"open", name, e}
}
return NewFile(uintptr(r), name), nil
}
func OpenFile(name string, mode int, perm uint32) (file *File, err error) {
r, e := syscall.Open(name, mode, perm)
if e != nil {
err = e
}
return newFile(r, name), err
}
func addFilesToKqueue(evTrackList []syscall.Kevent_t, dirPath string) {
fileList, err := ioutil.ReadDir(dirPath)
if err != nil {
log.Fatal("ReadDir failed: ", err)
}
for _, file := range fileList {
newPath := dirPath + "/" + file.Name()
if file.IsDir() && file.Name() != ".git" {
addFilesToPoll(newPath)
} else {
fileName := file.Name()
if len(strings.Split(fileName, ".")) > 1 {
fileExt := strings.Split(fileName, ".")[1]
if fileExt == ext {
fd, err := syscall.Open(newPath, syscall.O_RDONLY, 0)
if err != nil {
log.Fatal("Open failed: ", err)
}
// build kevent
ev := syscall.Kevent_t{
Ident: uint64(fd),
Filter: syscall.EVFILT_VNODE,
Flags: syscall.EV_ADD | syscall.EV_ENABLE | syscall.EV_ONESHOT,
Fflags: syscall.NOTE_DELETE | syscall.NOTE_WRITE,
Data: 0,
Udata: nil,
}
evTrackList = append(evTrackList, ev)
}
}
}
}
}
// watch starts to watch given p file/directory.
func (k *kqueue) singlewatch(p string, e Event, direct bool,
fi os.FileInfo) error {
w, ok := k.pthLkp[p]
if !ok {
fd, err := syscall.Open(p, syscall.O_NONBLOCK|syscall.O_RDONLY, 0)
if err != nil {
return err
}
w = &watched{fd: fd, p: p, fi: fi}
}
if direct {
w.eDir |= e
} else {
w.eNonDir |= e
}
var kevn [1]syscall.Kevent_t
syscall.SetKevent(&kevn[0], w.fd, syscall.EVFILT_VNODE,
syscall.EV_ADD|syscall.EV_CLEAR)
kevn[0].Fflags = encode(w.eDir | w.eNonDir)
if _, err := syscall.Kevent(k.fd, kevn[:], nil, nil); err != nil {
return err
}
if !ok {
k.idLkp[w.fd], k.pthLkp[w.p] = w, w
return nil
}
return errAlreadyWatched
}
func exclusiveOpenFailsOnDevice(pathname string) (bool, error) {
isDevice, err := pathIsDevice(pathname)
if err != nil {
return false, fmt.Errorf(
"PathIsDevice failed for path %q: %v",
pathname,
err)
}
if !isDevice {
glog.Errorf("Path %q is not refering to a device.", pathname)
return false, nil
}
fd, errno := syscall.Open(pathname, syscall.O_RDONLY|syscall.O_EXCL, 0)
// If the device is in use, open will return an invalid fd.
// When this happens, it is expected that Close will fail and throw an error.
defer syscall.Close(fd)
if errno == nil {
// device not in use
return false, nil
} else if errno == syscall.EBUSY {
// device is in use
return true, nil
}
// error during call to Open
return false, errno
}
// Pty returns a UNIX 98 pseudoterminal device.
// Pty returns a pair of fds representing the master and slave pair.
func Pty() (*os.File, *os.File, error) {
open := func(path string) (uintptr, error) {
fd, err := syscall.Open(path, syscall.O_NOCTTY|syscall.O_RDWR|syscall.O_CLOEXEC, 0666)
if err != nil {
return 0, fmt.Errorf("unable to open %q: %v", path, err)
}
return uintptr(fd), nil
}
ptm, err := open("/dev/ptmx")
if err != nil {
return nil, nil, err
}
sname, err := ptsname(ptm)
if err != nil {
return nil, nil, err
}
err = grantpt(ptm)
if err != nil {
return nil, nil, err
}
err = unlockpt(ptm)
if err != nil {
return nil, nil, err
}
pts, err := open(sname)
if err != nil {
return nil, nil, err
}
return os.NewFile(uintptr(ptm), "ptm"), os.NewFile(uintptr(pts), sname), nil
}
func open(name string) (uintptr, error) {
fd, err := syscall.Open(name, syscall.O_RDONLY, 0)
if err != nil {
return 0, err
}
return uintptr(fd), nil
}
// OpenTerminal is a clone of os.OpenFile without the O_CLOEXEC
// used to open the pty slave inside the container namespace
func OpenTerminal(name string, flag int) (*os.File, error) {
r, e := syscall.Open(name, flag, 0)
if e != nil {
return nil, &os.PathError{Op: "open", Path: name, Err: e}
}
return os.NewFile(uintptr(r), name), nil
}
// GetFromName gets a handle to a named network namespace such as one
// created by `ip netns add`.
func GetFromName(name string) (NsHandle, error) {
fd, err := syscall.Open(fmt.Sprintf("/var/run/netns/%s", name), syscall.O_RDONLY, 0)
if err != nil {
return -1, err
}
return NsHandle(fd), nil
}
// GetFromName gets a handle to the network namespace of a given pid.
func GetFromPid(pid int) (NsHandle, error) {
fd, err := syscall.Open(fmt.Sprintf("/proc/%d/ns/net", pid), syscall.O_RDONLY, 0)
if err != nil {
return -1, err
}
return NsHandle(fd), nil
}
// GetFromPath gets a handle to a network namespace
// identified by the path
func GetFromPath(path string) (NsHandle, error) {
fd, err := syscall.Open(path, syscall.O_RDONLY, 0)
if err != nil {
return -1, err
}
return NsHandle(fd), 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)
}
}
// Open the named path for reading, writing or both, depnding on the
// flags argument.
func Open(name string, flags int) (*FD, error) {
sysfd, err := syscall.Open(name, flags, o_MODE)
if err != nil {
return nil, err
}
return newFD(sysfd, name)
}
func init() {
switch path, _ := syscall.Getenv("GOCOVOUT"); path {
case "":
// No tracing
case "-":
Default.Tracer = fdwriter(syscall.Stdout)
default:
// Add the process ID to the filename.
// TODO handle PID reuse by checking if file exists.
path += "." + itoa(syscall.Getpid())
mode := syscall.O_WRONLY | syscall.O_CREAT | syscall.O_TRUNC
fd, err := syscall.Open(path, mode, 0666)
if err != nil {
msg := "gocov: failed to create log file: "
msg += err.Error() + "\n"
write(fdwriter(syscall.Stderr), []byte(msg))
syscall.Exit(1)
}
Default.Tracer = fdwriter(int(fd))
}
// Remove GOCOVOUT from environ, to prevent noise from child processes.
// TODO Don't do this; append .pid to output filename.
syscall.Setenv("GOCOVOUT", "")
}
// NewWatched implements trigger.
func (*kq) NewWatched(p string, fi os.FileInfo) (*watched, error) {
fd, err := syscall.Open(p, syscall.O_NONBLOCK|syscall.O_RDONLY, 0)
if err != nil {
return nil, err
}
return &watched{fd: fd, p: p, fi: fi}, nil
}
// OpenFile is the generalized open call; most users will use Open
// or Create instead. It opens the named file with specified flag
// (O_RDONLY etc.) and perm, (0666 etc.) if applicable. If successful,
// methods on the returned File can be used for I/O.
// If there is an error, it will be of type *PathError.
func OpenFile(name string, flag int, perm FileMode) (file *File, err error) {
chmod := false
if !supportsCreateWithStickyBit && flag&O_CREATE != 0 && perm&ModeSticky != 0 {
if _, err := Stat(name); IsNotExist(err) {
chmod = true
}
}
r, e := syscall.Open(name, flag|syscall.O_CLOEXEC, syscallMode(perm))
if e != nil {
return nil, &PathError{"open", name, e}
}
// open(2) itself won't handle the sticky bit on *BSD and Solaris
if chmod {
Chmod(name, perm)
}
// There's a race here with fork/exec, which we are
// content to live with. See ../syscall/exec_unix.go.
if !supportsCloseOnExec {
syscall.CloseOnExec(r)
}
return NewFile(uintptr(r), name), nil
}
func init() {
var err error
hConin, err = syscall.Open("CONIN$", syscall.O_RDWR, 0)
if err != nil {
panic(fmt.Sprintf("conio: %v", err))
}
}
