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<erlref>
  <header>
    <copyright>
      <year>2010</year><year>2012</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

      Unless required by applicable law or agreed to in writing, software
      distributed under the License is distributed on an "AS IS" BASIS,
      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      See the License for the specific language governing permissions and
      limitations under the License.

    </legalnotice>

    <title>ct_rpc</title>
    <prepared></prepared>
    <responsible></responsible>
    <docno></docno>
    <approved></approved>
    <checked></checked>
    <date></date>
    <rev>A</rev>
    <file>ct_rpc.xml</file>
  </header>
  <module>ct_rpc</module>
  <modulesummary>Common Test specific layer on Erlang/OTP rpc.</modulesummary>

  <description>

    <p><c>Common Test</c> specific layer on Erlang/OTP <c>rpc</c>.</p>

  </description>

  <funcs>
    <func>
      <name>app_node(App, Candidates) -&gt; NodeName</name>
      <fsummary>From a set of candidate nodes determines which of them is
        running the application App.</fsummary>
      <type>
        <v>App = atom()</v>
        <v>Candidates = [NodeName]</v>
        <v>NodeName = atom()</v>
      </type>
      <desc><marker id="app_node-2"/>
        <p>From a set of candidate nodes determines which of them is running
          the application <c>App</c>. If none of the candidate nodes is
          running <c>App</c>, the function makes the test case calling
          this function to fail. This function is the same as calling
          <c>app_node(App, Candidates, true)</c>.</p>
      </desc>
    </func>

    <func>
      <name>app_node(App, Candidates, FailOnBadRPC) -&gt; NodeName</name>
        <fsummary>Same as app_node/2, except that argument FailOnBadRPC
          determines if the search for a candidate node is to stop if
          badrpc is received at some point.</fsummary>
      <type>
        <v>App = atom()</v>
        <v>Candidates = [NodeName]</v>
        <v>NodeName = atom()</v>
        <v>FailOnBadRPC = true | false</v>
      </type>
      <desc><marker id="app_node-3"/>
        <p>Same as
          <seealso marker="#app_node-2"><c>ct_rpc:app_node/2</c></seealso>,
          except that argument <c>FailOnBadRPC</c> determines if the search
          for a candidate node is to stop if <c>badrpc</c> is received at
          some point.</p>
      </desc>
    </func>

    <func>
      <name>app_node(App, Candidates, FailOnBadRPC, Cookie) -&gt; NodeName</name>
      <fsummary>Same as app_node/2, except that argument FailOnBadRPC
        determines if the search for a candidate node is to stop if badrpc is
        received at some point.</fsummary>
      <type>
        <v>App = atom()</v>
        <v>Candidates = [NodeName]</v>
        <v>NodeName = atom()</v>
        <v>FailOnBadRPC = true | false</v>
        <v>Cookie = atom()</v>
      </type>
      <desc><marker id="app_node-4"/>
        <p>Same as
          <seealso marker="#app_node-2"><c>ct_rpc:app_node/2</c></seealso>,
          except that argument <c>FailOnBadRPC</c> determines if the search
          for a candidate node is to stop if <c>badrpc</c> is received at
          some point.</p>

        <p>The cookie on the client node is set to <c>Cookie</c> for this
          <c>rpc</c> operation (used to match the server node cookie).</p>
      </desc>
    </func>

    <func>
      <name>call(Node, Module, Function, Args) -&gt; term() | {badrpc, Reason}</name>
      <fsummary>Same as call(Node, Module, Function, Args, infinity).</fsummary>
      <desc><marker id="call-4"/>
        <p>Same as <c>call(Node, Module, Function, Args, infinity)</c>.</p>
      </desc>
    </func>

    <func>
      <name>call(Node, Module, Function, Args, TimeOut) -&gt; term() | {badrpc, Reason}</name>
      <fsummary>Evaluates apply(Module, Function, Args) on the node
        Node.</fsummary>
      <type>
        <v>Node = NodeName | {Fun, FunArgs}</v>
        <v>Fun = function()</v>
        <v>FunArgs = term()</v>
        <v>NodeName = atom()</v>
        <v>Module = atom()</v>
        <v>Function = atom()</v>
        <v>Args = [term()]</v>
        <v>Reason = timeout | term()</v>
      </type>
      <desc><marker id="call-5"/>
        <p>Evaluates <c>apply(Module, Function, Args)</c> on the node
          <c>Node</c>. Returns either whatever <c>Function</c> returns, or
          <c>{badrpc, Reason}</c> if the remote procedure call fails. If
          <c>Node</c> is <c>{Fun, FunArgs}</c>, applying <c>Fun</c> to
          <c>FunArgs</c> is to return a node name.</p>
      </desc>
    </func>

    <func>
      <name>call(Node, Module, Function, Args, TimeOut, Cookie) -&gt; term() | {badrpc, Reason}</name>
      <fsummary>Evaluates apply(Module, Function, Args) on the node
        Node.</fsummary>
      <type>
        <v>Node = NodeName | {Fun, FunArgs}</v>
        <v>Fun = function()</v>
        <v>FunArgs = term()</v>
        <v>NodeName = atom()</v>
        <v>Module = atom()</v>
        <v>Function = atom()</v>
        <v>Args = [term()]</v>
        <v>Reason = timeout | term()</v>
        <v>Cookie = atom()</v>
      </type>
      <desc><marker id="call-6"/>
        <p>Evaluates <c>apply(Module, Function, Args)</c> on the node
          <c>Node</c>. Returns either whatever <c>Function</c> returns, or
          <c>{badrpc, Reason}</c> if the remote procedure call fails. If
          <c>Node</c> is <c>{Fun, FunArgs}</c>, applying <c>Fun</c> to
          <c>FunArgs</c> is to return a node name.</p>

        <p>The cookie on the client node is set to <c>Cookie</c> for this
          <c>rpc</c> operation (used to match the server node cookie).</p>
      </desc>
    </func>

    <func>
      <name>cast(Node, Module, Function, Args) -&gt; ok</name>
      <fsummary>Evaluates apply(Module, Function, Args) on the node
        Node.</fsummary>
      <type>
        <v>Node = NodeName | {Fun, FunArgs}</v>
        <v>Fun = function()</v>
        <v>FunArgs = term()</v>
        <v>NodeName = atom()</v>
        <v>Module = atom()</v>
        <v>Function = atom()</v>
        <v>Args = [term()]</v>
        <v>Reason = timeout | term()</v>
      </type>
      <desc><marker id="cast-4"/>
        <p>Evaluates <c>apply(Module, Function, Args)</c> on the node
          <c>Node</c>. No response is delivered and the process that makes
          the call is not suspended until the evaluation is completed as in
          the case of <c>call/3,4</c>. If <c>Node</c> is
          <c>{Fun, FunArgs}</c>, applying <c>Fun</c> to <c>FunArgs</c> is to
          return a node name.</p>
      </desc>
    </func>

    <func>
      <name>cast(Node, Module, Function, Args, Cookie) -&gt; ok</name>
      <fsummary>Evaluates apply(Module, Function, Args) on the node
        Node.</fsummary>
      <type>
        <v>Node = NodeName | {Fun, FunArgs}</v>
        <v>Fun = function()</v>
        <v>FunArgs = term()</v>
        <v>NodeName = atom()</v>
        <v>Module = atom()</v>
        <v>Function = atom()</v>
        <v>Args = [term()]</v>
        <v>Reason = timeout | term()</v>
        <v>Cookie = atom()</v>
      </type>
      <desc><marker id="cast-5"/>
        <p>Evaluates <c>apply(Module, Function, Args)</c> on the node
          <c>Node</c>. No response is delivered and the process that makes
          the call is not suspended until the evaluation is completed as in
          the case of <c>call/3,4</c>. If <c>Node</c> is
          <c>{Fun, FunArgs}</c>, applying <c>Fun</c> to <c>FunArgs</c> is to
          return a node name.</p>

        <p>The cookie on the client node is set to <c>Cookie</c> for this
          <c>rpc</c> operation (used to match the server node cookie).</p>
      </desc>
    </func>
  </funcs>

</erlref>


