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doc: mention errors thrown by methods called on an unbound dgram.Socket #33983

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doc: mention errors thrown by methods called on an unbound dgram.Socket #33983

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935eb1b
doc: mention errors thrown by methods called on an unbound dgram.Socket
mkrawczuk Jun 19, 2020
23ad265
fixup! add subject to sentences.
mkrawczuk Jun 20, 2020
9199da6
fixup! It -> this method.
mkrawczuk Jun 21, 2020
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36 changes: 34 additions & 2 deletions doc/api/dgram.md
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Expand Up @@ -108,6 +108,9 @@ Tells the kernel to join a multicast group at the given `multicastAddress` and
one interface and will add membership to it. To add membership to every
available interface, call `addMembership` multiple times, once per interface.

When called on an unbound socket, implicitly binds to a random port, listening
on all interfaces.
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When sharing a UDP socket across multiple `cluster` workers, the
`socket.addMembership()` function must be called only once or an
`EADDRINUSE` error will occur:
Expand Down Expand Up @@ -143,6 +146,10 @@ is not specified, the operating system will choose one interface and will add
membership to it. To add membership to every available interface, call
`socket.addSourceSpecificMembership()` multiple times, once per interface.


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When called on an unbound socket, implicitly binds to a random port, listening
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on all interfaces.

### `socket.address()`
<!-- YAML
added: v0.1.99
Expand All @@ -154,6 +161,8 @@ Returns an object containing the address information for a socket.
For UDP sockets, this object will contain `address`, `family` and `port`
properties.

Throws `EBADF` if called on an unbound socket.

### `socket.bind([port][, address][, callback])`
<!-- YAML
added: v0.1.99
Expand Down Expand Up @@ -298,8 +307,9 @@ added: v12.0.0
-->

A synchronous function that disassociates a connected `dgram.Socket` from
its remote address. Trying to call `disconnect()` on an already disconnected
socket will result in an [`ERR_SOCKET_DGRAM_NOT_CONNECTED`][] exception.
its remote address. Trying to call `disconnect()` on an unbound or already
disconnected socket will result in an [`ERR_SOCKET_DGRAM_NOT_CONNECTED`][]
exception.

### `socket.dropMembership(multicastAddress[, multicastInterface])`
<!-- YAML
Expand Down Expand Up @@ -344,13 +354,17 @@ added: v8.7.0

* Returns: {number} the `SO_RCVBUF` socket receive buffer size in bytes.

Throws [`ERR_SOCKET_BUFFER_SIZE`][] if called on an unbound socket.
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### `socket.getSendBufferSize()`
<!-- YAML
added: v8.7.0
-->

* Returns: {number} the `SO_SNDBUF` socket send buffer size in bytes.

Throws [`ERR_SOCKET_BUFFER_SIZE`][] if called on an unbound socket.

### `socket.ref()`
<!-- YAML
added: v0.9.1
Expand Down Expand Up @@ -452,6 +466,8 @@ Offset and length are optional but both *must* be set if either are used.
They are supported only when the first argument is a `Buffer`, a `TypedArray`,
or a `DataView`.

Throws [`ERR_SOCKET_BAD_PORT`][] if called on an unbound socket.

Example of sending a UDP packet to a port on `localhost`;

```js
Expand Down Expand Up @@ -532,6 +548,8 @@ added: v0.6.9
Sets or clears the `SO_BROADCAST` socket option. When set to `true`, UDP
packets may be sent to a local interface's broadcast address.

Throws `EBADF` if called on an unbound socket.

### `socket.setMulticastInterface(multicastInterface)`
<!-- YAML
added: v8.6.0
Expand All @@ -558,6 +576,8 @@ also use explicit scope in addresses, so only packets sent to a multicast
address without specifying an explicit scope are affected by the most recent
successful use of this call.

Throws `EBADF` if called on an unbound socket.

#### Example: IPv6 outgoing multicast interface

On most systems, where scope format uses the interface name:
Expand Down Expand Up @@ -620,6 +640,8 @@ added: v0.3.8
Sets or clears the `IP_MULTICAST_LOOP` socket option. When set to `true`,
multicast packets will also be received on the local interface.

Throws `EBADF` if called on an unbound socket.

### `socket.setMulticastTTL(ttl)`
<!-- YAML
added: v0.3.8
Expand All @@ -635,6 +657,8 @@ decremented to 0 by a router, it will not be forwarded.

The `ttl` argument may be between 0 and 255. The default on most systems is `1`.

Throws `EBADF` if called on an unbound socket.

### `socket.setRecvBufferSize(size)`
<!-- YAML
added: v8.7.0
Expand All @@ -645,6 +669,8 @@ added: v8.7.0
Sets the `SO_RCVBUF` socket option. Sets the maximum socket receive buffer
in bytes.

Throws [`ERR_SOCKET_BUFFER_SIZE`][] if called on an unbound socket.

### `socket.setSendBufferSize(size)`
<!-- YAML
added: v8.7.0
Expand All @@ -655,6 +681,8 @@ added: v8.7.0
Sets the `SO_SNDBUF` socket option. Sets the maximum socket send buffer
in bytes.

Throws [`ERR_SOCKET_BUFFER_SIZE`][] if called on an unbound socket.

### `socket.setTTL(ttl)`
<!-- YAML
added: v0.1.101
Expand All @@ -671,6 +699,8 @@ Changing TTL values is typically done for network probes or when multicasting.
The `ttl` argument may be between between 1 and 255. The default on most systems
is 64.

Throws `EBADF` if called on an unbound socket.

### `socket.unref()`
<!-- YAML
added: v0.9.1
Expand Down Expand Up @@ -749,6 +779,8 @@ and `udp6` sockets). The bound address and port can be retrieved using
[`socket.address().address`][] and [`socket.address().port`][].

[`'close'`]: #dgram_event_close
[`ERR_SOCKET_BAD_PORT`]: errors.html#errors_err_socket_bad_port
[`ERR_SOCKET_BUFFER_SIZE`]: errors.html#errors_err_socket_buffer_size
[`ERR_SOCKET_DGRAM_IS_CONNECTED`]: errors.html#errors_err_socket_dgram_is_connected
[`ERR_SOCKET_DGRAM_NOT_CONNECTED`]: errors.html#errors_err_socket_dgram_not_connected
[`Error`]: errors.html#errors_class_error
Expand Down