MaxSendfdLen is the maximum length of the name of a file descriptor being sent using SendFd. The name of the file handle returned by RecvFd will never be larger than this value.
const MaxNameLen = 4096
NativeEndian is the native byte order of the host system.
var NativeEndian binary.ByteOrder
func Annotations(labels []string) (bundle string, userAnnotations map[string]string)
Annotations returns the bundle path and user defined annotations from the libcontainer state. We need to remove the bundle because that is a label added by libcontainer.
func CleanPath(path string) string
CleanPath makes a path safe for use with filepath.Join. This is done by not only cleaning the path, but also (if the path is relative) adding a leading '/' and cleaning it (then removing the leading '/'). This ensures that a path resulting from prepending another path will always resolve to lexically be a subdirectory of the prefixed path. This is all done lexically, so paths that include symlinks won't be safe as a result of using CleanPath.
func CloseExecFrom(minFd int) error
CloseExecFrom sets the O_CLOEXEC flag on all file descriptors greater or equal to minFd in the current process.
func EnsureProcHandle(fh *os.File) error
EnsureProcHandle returns whether or not the given file handle is on procfs.
func ExitStatus(status unix.WaitStatus) int
ExitStatus returns the correct exit status for a process based on if it was signaled or exited cleanly
func NewSockPair(name string) (parent *os.File, child *os.File, err error)
NewSockPair returns a new unix socket pair
func RecvFd(socket *os.File) (*os.File, error)
RecvFd waits for a file descriptor to be sent over the given AF_UNIX socket. The file name of the remote file descriptor will be recreated locally (it is sent as non-auxiliary data in the same payload).
func SearchLabels(labels []string, query string) string
SearchLabels searches a list of key-value pairs for the provided key and returns the corresponding value. The pairs must be separated with '='.
func SendFd(socket *os.File, name string, fd uintptr) error
SendFd sends a file descriptor over the given AF_UNIX socket. In addition, the file.Name() of the given file will also be sent as non-auxiliary data in the same payload (allowing to send contextual information for a file descriptor).
func SendFds(socket *os.File, msg []byte, fds ...int) error
SendFds sends a list of files descriptor and msg over the given AF_UNIX socket.
func UnsafeCloseFrom(minFd int) error
UnsafeCloseFrom closes all file descriptors greater or equal to minFd in the current process, except for those critical to Go's runtime (such as the netpoll management descriptors).
NOTE: That this function is incredibly dangerous to use in most Go code, as closing file descriptors from underneath *os.File handles can lead to very bad behaviour (the closed file descriptor can be re-used and then any *os.File operations would apply to the wrong file). This function is only intended to be called from the last stage of runc init.
func WithProcfd(root, unsafePath string, fn func(procfd string) error) error
WithProcfd runs the passed closure with a procfd path (/proc/self/fd/...) corresponding to the unsafePath resolved within the root. Before passing the fd, this path is verified to have been inside the root -- so operating on it through the passed fdpath should be safe. Do not access this path through the original path strings, and do not attempt to use the pathname outside of the passed closure (the file handle will be freed once the closure returns).
func WriteJSON(w io.Writer, v interface{}) error
WriteJSON writes the provided struct v to w using standard json marshaling