View Source Node (Elixir v1.12.3)
Functions related to VM nodes.
Some of the functions in this module are inlined by the compiler,
similar to functions in the Kernel
module and they are explicitly
marked in their docs as "inlined by the compiler". For more information
about inlined functions, check out the Kernel
module.
Link to this section Summary
Functions
Returns true
if the local node is alive.
Establishes a connection to node
.
Forces the disconnection of a node.
Returns the magic cookie of the local node.
Returns a list of all visible nodes in the system, excluding the local node.
Returns a list of nodes according to argument given.
Monitors the status of the node.
Behaves as monitor/2
except that it allows an extra
option to be given, namely :allow_passive_connect
.
Tries to set up a connection to node.
Returns the current node.
Sets the magic cookie of node
to the atom cookie
.
Returns the PID of a new process started by the application of fun
on node
. If node
does not exist, a useless PID is returned.
Returns the PID of a new process started by the application of fun
on node
.
Returns the PID of a new process started by the application of
module.function(args)
on node
.
Returns the PID of a new process started by the application of
module.function(args)
on node
.
Returns the PID of a new linked process started by the application of fun
on node
.
Returns the PID of a new linked process started by the application of
module.function(args)
on node
.
Turns a non-distributed node into a distributed node.
Turns a distributed node into a non-distributed node.
Link to this section Types
@type state() :: :visible | :hidden | :connected | :this | :known
@type t() :: node()
Link to this section Functions
@spec alive?() :: boolean()
Returns true
if the local node is alive.
That is, if the node can be part of a distributed system.
Establishes a connection to node
.
Returns true
if successful, false
if not, and the atom
:ignored
if the local node is not alive.
For more information, see :net_kernel.connect_node/1
.
Forces the disconnection of a node.
This will appear to the node
as if the local node has crashed.
This function is mainly used in the Erlang network authentication
protocols. Returns true
if disconnection succeeds, otherwise false
.
If the local node is not alive, the function returns :ignored
.
For more information, see :erlang.disconnect_node/1
.
@spec get_cookie() :: atom()
Returns the magic cookie of the local node.
Returns the cookie if the node is alive, otherwise :nocookie
.
@spec list() :: [t()]
Returns a list of all visible nodes in the system, excluding the local node.
Same as list(:visible)
.
Inlined by the compiler.
Returns a list of nodes according to argument given.
The result returned when the argument is a list, is the list of nodes satisfying the disjunction(s) of the list elements.
For more information, see :erlang.nodes/1
.
Inlined by the compiler.
Monitors the status of the node.
If flag
is true
, monitoring is turned on.
If flag
is false
, monitoring is turned off.
For more information, see :erlang.monitor_node/2
.
For monitoring status changes of all nodes, see :net_kernel.monitor_nodes/2
.
Behaves as monitor/2
except that it allows an extra
option to be given, namely :allow_passive_connect
.
For more information, see :erlang.monitor_node/3
.
For monitoring status changes of all nodes, see :net_kernel.monitor_nodes/2
.
@spec ping(t()) :: :pong | :pang
Tries to set up a connection to node.
Returns :pang
if it fails, or :pong
if it is successful.
Examples
iex> Node.ping(:unknown_node)
:pang
@spec self() :: t()
Returns the current node.
It returns the same as the built-in node()
.
Sets the magic cookie of node
to the atom cookie
.
The default node is Node.self/0
, the local node. If node
is the local node,
the function also sets the cookie of all other unknown nodes to cookie
.
This function will raise FunctionClauseError
if the given node
is not alive.
Returns the PID of a new process started by the application of fun
on node
. If node
does not exist, a useless PID is returned.
For the list of available options, see :erlang.spawn/2
.
Inlined by the compiler.
Returns the PID of a new process started by the application of fun
on node
.
If node
does not exist, a useless PID is returned.
For the list of available options, see :erlang.spawn_opt/3
.
Inlined by the compiler.
Returns the PID of a new process started by the application of
module.function(args)
on node
.
If node
does not exist, a useless PID is returned.
For the list of available options, see :erlang.spawn/4
.
Inlined by the compiler.
Returns the PID of a new process started by the application of
module.function(args)
on node
.
If node
does not exist, a useless PID is returned.
For the list of available options, see :erlang.spawn/4
.
Inlined by the compiler.
Returns the PID of a new linked process started by the application of fun
on node
.
A link is created between the calling process and the new process, atomically.
If node
does not exist, a useless PID is returned (and due to the link, an exit
signal with exit reason :noconnection
will be received).
Inlined by the compiler.
Returns the PID of a new linked process started by the application of
module.function(args)
on node
.
A link is created between the calling process and the new process, atomically.
If node
does not exist, a useless PID is returned (and due to the link, an exit
signal with exit reason :noconnection
will be received).
Inlined by the compiler.
@spec start(node(), :longnames | :shortnames, non_neg_integer()) :: {:ok, pid()} | {:error, term()}
Turns a non-distributed node into a distributed node.
This functionality starts the :net_kernel
and other related
processes.
This function is rarely invoked in practice. Instead, nodes are
named and started via the command line by using the --sname
and
--name
flags. If you need to use this function to dynamically
name a node, please make sure the epmd
operating system process
is running by calling epmd -daemon
.
Invoking this function when the distribution has already been started, either via the command line interface or dynamically, will return an error.
Examples
{:ok, pid} = Node.start(:example, :shortnames, 15000)
@spec stop() :: :ok | {:error, :not_allowed | :not_found}
Turns a distributed node into a non-distributed node.
For other nodes in the network, this is the same as the node going down.
Only possible when the node was started with Node.start/3
, otherwise
returns {:error, :not_allowed}
. Returns {:error, :not_found}
if the
local node is not alive.