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File 3106-kernel-esock-doc-Document-the-sendv-function.patch of Package erlang (Revision a95c38533dd94a5c195230b3b146d029)

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From afb43e39d19b880b34b15b82a65d1d2a20bc963c Mon Sep 17 00:00:00 2001
From: Micael Karlberg <bmk@erlang.org>
Date: Thu, 2 Nov 2023 14:41:21 +0100
Subject: [PATCH 06/11] [kernel|esock|doc] Document the sendv function

OTP-18845
---
 lib/kernel/src/socket.erl | 63 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/lib/kernel/src/socket.erl b/lib/kernel/src/socket.erl
index bbbf317490..2340b09a02 100644
--- a/lib/kernel/src/socket.erl
+++ b/lib/kernel/src/socket.erl
@@ -4191,6 +4191,13 @@ sendmsg_deadline_cont(SockRef, Data, Cont, Deadline, HasWritten) ->
 %%
 %%
 
+-doc """
+[](){: #sendv }
+
+Translates to the following call: [`sendv(Socket, IOV, infinity)`](`sendv/3`).
+""".
+-doc(#{equiv => sendv/3}).
+-doc(#{since => <<"OTP 27.0">>}).
 -spec sendv(Socket, IOV) ->
           'ok' |
           {'ok', RestIOV} |
@@ -4206,6 +4213,43 @@ sendv(Socket, IOV) ->
     sendv(Socket, IOV, ?ESOCK_SENDMSG_TIMEOUT_DEFAULT).
 
 
+-doc """
+[](){: #sendv-timeout }
+
+Send data on a connected socket, with:
+
+- **`Cont`** - (clause 1; `Cont` :: [`select_info()`](`t:select_info/0`)) This call translates to the following call: [`sendv(Socket, IOV, Cont, infinity)`](`sendv/4`).
+
+- **`Handle`** - (clause 3; `Handle` :: [`select_handle()`](`t:select_handle/0`) `|` [`completion_handle()`](`t:completion_handle/0`)) that term will be contained in the returned `SelectInfo` or `CompletionInfo` and the corresponding `select` or `completion` message. The handle is presumed to be unique to this call.
+
+- **`Timeout = infinity`** - waiting for the data to be sent.
+This call will not return until the `IOV` has been accepted by
+the platform's network layer, or it reports an error.
+
+- **`Timeout >= 0`** - waiting at most `Timeout` milliseconds for the data to be sent.
+
+- **`Timeout = nowait`** - returns (on Unix) `select` _or_ (on Windows) a `completion` continuation if the data could not be sent immediately.
+
+The return value indicates the result from the platform's network layer:
+
+- **`ok`** - All data has been accepted.
+
+- **`{select, `[`SelectInfo`](`t:select_info/0`)` | {`[`SelectInfo`](`t:select_info/0`)`, RestIOV}}`** - All data was not immediately accepted by the platform network layer. The caller will then receive this messages: `{'$socket', socket(), select, SelectHandle}`, after which a subsequent call to `sendv/4` will send the data. Only when `Timeout = nowait`.
+
+- **`{completion, `[`CompletionInfo`](`t:completion_info/0`)`}`** - All data was not immediately accepted by the platform network layer. The caller will then receive this messages: `{'$socket', socket(), completion, {CompletionHandle, CompletionStatus}}`. The result of the send will be in the `CompletionStatus`. Only when `Timeout = nowait`.
+
+- **`{ok, RestIOV}`** - Not all data has been accepted, but no error has been reported. `RestIOV` is the tail of `IOV` that has not been accepted. It is nevertheless possible for the platform's network layer to return this.
+
+- **`{error, timeout | {timeout, RestIOV}}`** - Was unable to send (all or part of) the data within the specified `Timeout` (only if `Timeout >= 0`).
+
+- **`{error, {Reason, RestIOV}}`** - An error has been reported, but before that, some data was accepted. `RestIOV` is the tail of `IOV` that has not been accepted. For `Reason`, see above.
+
+- **`{error, Reason}`** - An error has been reported and no data has been accepted. The [posix()](`t:posix/0`) `Reason` are from the platform's network layer.
+`closed` means that this socket library knows that the socket is closed, and
+[invalid()](`t:invalid/0`) means that something about an argument is invalid.
+
+""".
+-doc(#{since => <<"OTP 27.0">>}).
 -spec sendv(Socket, IOV, Cont) ->
           'ok' |
           {'ok', RestIOV} |
@@ -4298,6 +4342,24 @@ sendv(?socket(SockRef), IOV, Timeout)
 sendv(Socket, IOV, Timeout) ->
     erlang:error(badarg, [Socket, IOV, Timeout]).
 
+-doc """
+[](){: #sendv-cont }
+
+Send data on a connected socket, continuation.
+
+Continues sending data on a connected socket, where the
+send operation was initiated by `sendv/3` with
+`Timeout = nowait` that returned a `SelectInfo` continuation.
+Otherwise like infinite time-out `sendv/2,3,4` or
+limited time-out `sendv/3` respectively.
+`Cont` is the `SelectInfo` that was returned from the previous
+`sendv()` call.
+
+The return value indicates the result from the platform's network layer.
+See `sendv/3` (with `Timeout = infinity | nowait`)
+
+""".
+
 -spec sendv(Socket, IOV, Cont, Timeout :: 'nowait') ->
           'ok' |
           {'ok', RestIOV} |
@@ -4338,6 +4400,7 @@ sendv(Socket, IOV, Timeout) ->
       RestIOV    :: erlang:iovec(),
       Reason     :: posix() | 'closed' | invalid().
 
+-doc(#{since => <<"OTP 27.0">>}).
 sendv(?socket(SockRef) = _Socket, IOV,
       ?SELECT_INFO(SelectTag, _) = Cont, Timeout) 
   when is_reference(SockRef) andalso is_list(IOV) ->
-- 
2.35.3

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