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<erlref>
  <header>
    <copyright>
      <year>1998</year><year>2009</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      The contents of this file are subject to the Erlang Public License,
      Version 1.1, (the "License"); you may not use this file except in
      compliance with the License. You should have received a copy of the
      Erlang Public License along with this software. If not, it can be
      retrieved online at http://www.erlang.org/.
    
      Software distributed under the License is distributed on an "AS IS"
      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
      the License for the specific language governing rights and limitations
      under the License.
    
    </legalnotice>

    <title>i</title>
    <prepared></prepared>
    <docno></docno>
    <date></date>
    <rev></rev>
  </header>
  <module>i</module>
  <modulesummary>Debugger/Interpreter Interface</modulesummary>
  <description>
    <p>The module <c>i</c> provides short forms for some of
      the functions used by the graphical Debugger and some of
      the functions in the <c>int</c> module, the Erlang interpreter.
    </p>

    <p>This module also provides facilities for displaying status
      information about interpreted processes and break points.</p>

    <p>It is possible to attach to interpreted processes by giving
      the corresponding process identity only. By default, an attachment
      window pops up. Processes at other Erlang nodes can be
      attached manually or automatically.</p>

    <p>By preference, these functions can be included in the module
      <c>shell_default</c>. By default, they are.</p>
  </description>

  <funcs>
    <func>
      <name>im() -> pid()</name>
      <fsummary>Start a graphical monitor</fsummary>
      <desc>
	<p>Starts a new graphical monitor. This is the Monitor window,
	  the main window of the Debugger. All of the Debugger and
	  interpreter functionality is accessed from the Monitor window.
	  The Monitor window displays the status of all processes that 
	  have been/are executing interpreted modules.</p>
      </desc>
    </func>

    <func>
      <name>ii(AbsModules) -> ok</name>
      <name>ii(AbsModule) -> {module, Module} | error</name>
      <name>ini(AbsModules) -> ok</name>
      <name>ini(AbsModule) -> {module, Module} | error</name>
      <fsummary>Interpret a module</fsummary>
      <type>
	<v>AbsModules = [AbsModule]</v>
	<v>AbsModule = Module | File</v>
	<v>&nbsp;Module = atom()</v>
	<v>&nbsp;File = string()</v>
      </type>
      <desc>
	<p>Interprets the specified module(s). <c>ii/1</c> interprets
	  the module(s) only at the current node, see
	  <seealso marker="int#i/1">int:i/1</seealso>. <c>ini/1</c>
	  interprets the module(s) at all known nodes, see
	  <seealso marker="int#ni/1">int:ni/1</seealso>.</p>
      </desc>
    </func>

    <func>
      <name>iq(AbsModule) -> ok</name>
      <name>inq(AbsModule) -> ok</name>
      <fsummary>Stop interpreting a module</fsummary>
      <type>
	<v>AbsModule = Module | File</v>
	<v>&nbsp;Module = atom()</v>
	<v>&nbsp;File = string()</v>
      </type>
      <desc>
	<p>Stops interpreting the specified module. <c>iq/1</c> stops
	  interpreting the module only at the current node. <c>inq/1</c>
	  stops interpreting the module at all known nodes.</p>
      </desc>
    </func>

    <func>
      <name>il() -> ok</name>
      <fsummary>Make a printout of all interpreted modules</fsummary>
      <desc>
	<p>Makes a printout of all interpreted modules.
	  Modules are printed together with the full path name of the 
	  corresponding source code file.</p>
      </desc>
    </func>

    <func>
      <name>ip() -> ok</name>
      <fsummary>Make a printout of the current status of all interpreted
	processes</fsummary>
      <desc>
	<p>Makes a printout of the current status of all interpreted 
	  processes.</p>
      </desc>
    </func>

    <func>
      <name>ic() -> ok</name>
      <fsummary>Clear information about processes executing interpreted
	code</fsummary>
      <desc>
	<p>Clears information about processes executing interpreted code
	  byt removing all information about terminated processes.</p>
      </desc>
    </func>

    <func>
      <name>iaa(Flags) -> true</name>
      <name>iaa(Flags, Function) -> true</name>
      <fsummary>Set when and how to attach to a process</fsummary>
      <type>
	<v>Flags = [init | break | exit]</v>
	<v>Function = {Module,Name,Args}</v>
	<v>&nbsp;Module = Name = atom()</v>
	<v>&nbsp;Args = [term()]</v>
      </type>
      <desc>
	<p>Sets when and how to automatically attach to a debugged
	  process, see
	  <seealso marker="int#auto_attach/0">int:auto_attach/2</seealso>.
	  <c>Function</c> defaults to the standard function used by
	  the Debugger.</p>
      </desc>
    </func>

    <func>
      <name>ist(Flag) -> true</name>
      <fsummary>Set how to save call frames</fsummary>
      <type>
	<v>Flag = all | no_tail | false</v>
      </type>
      <desc>
	<p>Sets how to save call frames in the stack, see
	  <seealso marker="int#stack_trace/0">int:stack_trace/1</seealso>.
	</p>
      </desc>
    </func>

    <func>
      <name>ia(Pid) -> ok | no_proc</name>
      <fsummary>Attach to a process</fsummary>
      <type>
	<v>Pid = pid()</v>
      </type>
      <desc>
	<p>Attaches to the debugged process <c>Pid</c>. A Debugger
	  Attach Process window is opened for the process.</p>
      </desc>
    </func>

    <func>
      <name>ia(X,Y,Z) -> ok | no_proc</name>
      <fsummary>Attach to a process</fsummary>
      <type>
	<v>X = Y = Z = int()</v>
      </type>
      <desc>
	<p>Same as <c>ia(Pid)</c>, where <c>Pid</c> is the result of
	  calling the shell function <c>pid(X,Y,Z)</c>.</p>
      </desc>
    </func>

    <func>
      <name>ia(Pid, Function) -> ok | no_proc</name>
      <fsummary>Attach to a process</fsummary>
      <type>
	<v>Pid = pid()</v>
	<v>Function = {Module,Name}</v>
	<v>&nbsp;Module = Name = atom()</v>
      </type>
      <desc>
	<p>Attaches to the debugged process <c>Pid</c>. The interpreter
	  will call <c>spawn(Module, Name, [Pid])</c> (and ignore
	  the result).</p>
      </desc>
    </func>

    <func>
      <name>ia(X,Y,Z, Function) -> ok | no_proc</name>
      <fsummary>Attach to a process</fsummary>
      <type>
	<v>X = Y = Z = int()</v>
	<v>Function = {Module,Name}</v>
	<v>&nbsp;Module = Name = atom()</v>
      </type>
      <desc>
	<p>Same as <c>ia(Pid, Function)</c>, where <c>Pid</c> is
	  the result of calling the shell function <c>pid(X,Y,Z)</c>.
	  An attached process is expected to call the unofficial
	  <c>int:attached(Pid)</c> function and to be able to handle
	  messages from the interpreter, see <c>dbg_ui_trace.erl</c> for
	  an example.</p>
      </desc>
    </func>

    <func>
      <name>ib(Module, Line) -> ok | {error, break_exists}</name>
      <fsummary>Create a breakpoint</fsummary>
      <type>
	<v>Module = atom()</v>
	<v>Line = int()</v>
      </type>
      <desc>
	<p>Creates a breakpoint at <c>Line</c> in <c>Module</c>.</p>
      </desc>
    </func>

    <func>
      <name>ib(Module, Name, Arity) -> ok | {error, function_not_found}
      </name>
      <fsummary>Create breakpoints in the specified function</fsummary>
      <type>
	<v>Module = Name = atom()</v>
	<v>Arity = int()</v>
      </type>
      <desc>
	<p>Creates breakpoints at the first line of every clause of 
	  the <c>Module:Name/Arity</c> function.</p>
      </desc>
    </func>

    <func>
      <name>ir() -> ok</name>
      <fsummary>Delete all breakpoints</fsummary>
      <desc>
	<p>Deletes all breakpoints.</p>
      </desc>
    </func>

    <func>
      <name>ir(Module) -> ok</name>
      <fsummary>Delete all breakpoints in a module</fsummary>
      <type>
	<v>Module = atom()</v>
      </type>
      <desc>
	<p>Deletes all breakpoints in <c>Module</c>.</p>
      </desc>
    </func>

    <func>
      <name>ir(Module, Line) -> ok</name>
      <fsummary>Delete a breakpoint</fsummary>
      <type>
	<v>Module = atom()</v>
	<v>Line = int()</v>
      </type>
      <desc>
	<p>Deletes the breakpoint located at <c>Line</c> in
	  <c>Module</c>.</p>
      </desc>
    </func>

    <func>
      <name>ir(Module, Name, Arity) -> ok | {error, function_not_found}
      </name>
      <fsummary>Delete breakpoints from the specified function
      </fsummary>
      <type>
	<v>Module = Name = atom()</v>
	<v>Arity = int()</v>
      </type>
      <desc>
	<p>Deletes the breakpoints at the first line of every clause of 
	  the <c>Module:Name/Arity</c> function.</p>
      </desc>
    </func>

    <func>
      <name>ibd(Module, Line) -> ok</name>
      <fsummary>Make a breakpoint inactive</fsummary>
      <type>
	<v>Module = atom()</v>
	<v>Line = int()</v>
      </type>
      <desc>
	<p>Makes the breakpoint at <c>Line</c> in <c>Module</c>
	  inactive.</p>
      </desc>
    </func>

    <func>
      <name>ibe(Module, Line) -> ok</name>
      <fsummary>Make a breakpoint active</fsummary>
      <type>
	<v>Module = atom()</v>
	<v>Line = int()</v>
      </type>
      <desc>
	<p>Makes the breakpoint at <c>Line</c> in <c>Module</c> active.
	</p>
      </desc>
    </func>

    <func>
      <name>iba(Module, Line, Action) -> ok</name>
      <fsummary>Set the trigger action of a breakpoint</fsummary>
      <type>
	<v>Module = atom()</v>
	<v>Line = int()</v>
	<v>Action = enable | disable | delete</v>
      </type>
      <desc>
	<p>Sets the trigger action of the breakpoint at <c>Line</c> in
	  <c>Module</c> to <c>Action</c>.</p>
      </desc>
    </func>

    <func>
      <name>ibc(Module, Line, Function) -> ok</name>
      <fsummary>Set the conditional test of a breakpoint</fsummary>
      <type>
	<v>Module = atom()</v>
	<v>Line = int()</v>
	<v>Function = {Module,Name}</v>
	<v>&nbsp;Name = atom()</v>
      </type>
      <desc>
	<p>Sets the conditional test of the breakpoint at <c>Line</c> in
	  <c>Module</c> to <c>Function</c>.</p>

	<p>The conditional test is performed by calling
	  <c>Module:Name(Bindings)</c>, where <c>Bindings</c> is
	  the current variable bindings. The function must return
	  <c>true</c> (break) or <c>false</c> (do not break). Use
	  <c>int:get_binding(Var, Bindings)</c> to retrieve the value
	  of a variable <c>Var</c>.</p>
      </desc>
    </func>

    <func>
      <name>ipb() -> ok</name>
      <fsummary>Make a printout of all existing breakpoints</fsummary>
      <desc>
	<p>Makes a printout of all existing breakpoints.</p>
      </desc>
    </func>

    <func>
      <name>ipb(Module) -> ok</name>
      <fsummary>Make a printout of all breakpoints in a module
      </fsummary>
      <type>
	<v>Module = atom()</v>
      </type>
      <desc>
	<p>Makes a printout of all existing breakpoints in
	  <c>Module</c>.</p>
      </desc>
    </func>

    <func>
      <name>iv() -> atom()</name>
      <fsummary>Current version number of the interpreter</fsummary>
      <desc>
	<p>Returns the current version number of the interpreter.
	  The same as the version number of the Debugger application.
	</p>
      </desc>
    </func>

    <func>
      <name>help() -> ok</name>
      <fsummary>Print help text</fsummary>
      <desc>
	<p>Prints help text.</p>
      </desc>
    </func>
  </funcs>

  <section>
    <title>Usage</title>

    <p>Refer to the Debugger User's Guide for information about
      the Debugger.</p>
  </section>

  <section>
  <title>See Also</title>
    <p><c>int(3)</c></p>
  </section>
</erlref>


