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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/stdlib-1.18.3.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>STDLIB</strong><br><strong>Reference Manual</strong><br><small>Version 1.18.3</small></p>
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<li title="STDLIB (App)"><a href="STDLIB_app.html">STDLIB (App)
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<li id="no" title="array " expanded="false">array<ul>
<li><a href="array.html">
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<li title="default-1"><a href="array.html#default-1">default/1</a></li>
<li title="fix-1"><a href="array.html#fix-1">fix/1</a></li>
<li title="foldl-3"><a href="array.html#foldl-3">foldl/3</a></li>
<li title="foldr-3"><a href="array.html#foldr-3">foldr/3</a></li>
<li title="from_list-1"><a href="array.html#from_list-1">from_list/1</a></li>
<li title="from_list-2"><a href="array.html#from_list-2">from_list/2</a></li>
<li title="from_orddict-1"><a href="array.html#from_orddict-1">from_orddict/1</a></li>
<li title="from_orddict-2"><a href="array.html#from_orddict-2">from_orddict/2</a></li>
<li title="get-2"><a href="array.html#get-2">get/2</a></li>
<li title="is_array-1"><a href="array.html#is_array-1">is_array/1</a></li>
<li title="is_fix-1"><a href="array.html#is_fix-1">is_fix/1</a></li>
<li title="map-2"><a href="array.html#map-2">map/2</a></li>
<li title="new-0"><a href="array.html#new-0">new/0</a></li>
<li title="new-1"><a href="array.html#new-1">new/1</a></li>
<li title="new-2"><a href="array.html#new-2">new/2</a></li>
<li title="relax-1"><a href="array.html#relax-1">relax/1</a></li>
<li title="reset-2"><a href="array.html#reset-2">reset/2</a></li>
<li title="resize-1"><a href="array.html#resize-1">resize/1</a></li>
<li title="resize-2"><a href="array.html#resize-2">resize/2</a></li>
<li title="set-3"><a href="array.html#set-3">set/3</a></li>
<li title="size-1"><a href="array.html#size-1">size/1</a></li>
<li title="sparse_foldl-3"><a href="array.html#sparse_foldl-3">sparse_foldl/3</a></li>
<li title="sparse_foldr-3"><a href="array.html#sparse_foldr-3">sparse_foldr/3</a></li>
<li title="sparse_map-2"><a href="array.html#sparse_map-2">sparse_map/2</a></li>
<li title="sparse_size-1"><a href="array.html#sparse_size-1">sparse_size/1</a></li>
<li title="sparse_to_list-1"><a href="array.html#sparse_to_list-1">sparse_to_list/1</a></li>
<li title="sparse_to_orddict-1"><a href="array.html#sparse_to_orddict-1">sparse_to_orddict/1</a></li>
<li title="to_list-1"><a href="array.html#to_list-1">to_list/1</a></li>
<li title="to_orddict-1"><a href="array.html#to_orddict-1">to_orddict/1</a></li>
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<li title="encode-1"><a href="base64.html#encode-1">encode/1</a></li>
<li title="encode_to_string-1"><a href="base64.html#encode_to_string-1">encode_to_string/1</a></li>
<li title="decode-1"><a href="base64.html#decode-1">decode/1</a></li>
<li title="decode_to_string-1"><a href="base64.html#decode_to_string-1">decode_to_string/1</a></li>
<li title="mime_decode-1"><a href="base64.html#mime_decode-1">mime_decode/1</a></li>
<li title="mime_decode_to_string-1"><a href="base64.html#mime_decode_to_string-1">mime_decode_to_string/1</a></li>
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<li id="no" title="beam_lib " expanded="false">beam_lib<ul>
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<li title="chunks-2"><a href="beam_lib.html#chunks-2">chunks/2</a></li>
<li title="chunks-3"><a href="beam_lib.html#chunks-3">chunks/3</a></li>
<li title="version-1"><a href="beam_lib.html#version-1">version/1</a></li>
<li title="md5-1"><a href="beam_lib.html#md5-1">md5/1</a></li>
<li title="info-1"><a href="beam_lib.html#info-1">info/1</a></li>
<li title="cmp-2"><a href="beam_lib.html#cmp-2">cmp/2</a></li>
<li title="cmp_dirs-2"><a href="beam_lib.html#cmp_dirs-2">cmp_dirs/2</a></li>
<li title="diff_dirs-2"><a href="beam_lib.html#diff_dirs-2">diff_dirs/2</a></li>
<li title="strip-1"><a href="beam_lib.html#strip-1">strip/1</a></li>
<li title="strip_files-1"><a href="beam_lib.html#strip_files-1">strip_files/1</a></li>
<li title="strip_release-1"><a href="beam_lib.html#strip_release-1">strip_release/1</a></li>
<li title="format_error-1"><a href="beam_lib.html#format_error-1">format_error/1</a></li>
<li title="crypto_key_fun-1"><a href="beam_lib.html#crypto_key_fun-1">crypto_key_fun/1</a></li>
<li title="clear_crypto_key_fun-0"><a href="beam_lib.html#clear_crypto_key_fun-0">clear_crypto_key_fun/0</a></li>
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<li title="bin_to_list-2"><a href="binary.html#bin_to_list-2">bin_to_list/2</a></li>
<li title="bin_to_list-3"><a href="binary.html#bin_to_list-3">bin_to_list/3</a></li>
<li title="compile_pattern-1"><a href="binary.html#compile_pattern-1">compile_pattern/1</a></li>
<li title="copy-1"><a href="binary.html#copy-1">copy/1</a></li>
<li title="copy-2"><a href="binary.html#copy-2">copy/2</a></li>
<li title="decode_unsigned-1"><a href="binary.html#decode_unsigned-1">decode_unsigned/1</a></li>
<li title="decode_unsigned-2"><a href="binary.html#decode_unsigned-2">decode_unsigned/2</a></li>
<li title="encode_unsigned-1"><a href="binary.html#encode_unsigned-1">encode_unsigned/1</a></li>
<li title="encode_unsigned-2"><a href="binary.html#encode_unsigned-2">encode_unsigned/2</a></li>
<li title="first-1"><a href="binary.html#first-1">first/1</a></li>
<li title="last-1"><a href="binary.html#last-1">last/1</a></li>
<li title="list_to_bin-1"><a href="binary.html#list_to_bin-1">list_to_bin/1</a></li>
<li title="longest_common_prefix-1"><a href="binary.html#longest_common_prefix-1">longest_common_prefix/1</a></li>
<li title="longest_common_suffix-1"><a href="binary.html#longest_common_suffix-1">longest_common_suffix/1</a></li>
<li title="match-2"><a href="binary.html#match-2">match/2</a></li>
<li title="match-3"><a href="binary.html#match-3">match/3</a></li>
<li title="matches-2"><a href="binary.html#matches-2">matches/2</a></li>
<li title="matches-3"><a href="binary.html#matches-3">matches/3</a></li>
<li title="part-2"><a href="binary.html#part-2">part/2</a></li>
<li title="part-3"><a href="binary.html#part-3">part/3</a></li>
<li title="referenced_byte_size-1"><a href="binary.html#referenced_byte_size-1">referenced_byte_size/1</a></li>
<li title="replace-3"><a href="binary.html#replace-3">replace/3</a></li>
<li title="replace-4"><a href="binary.html#replace-4">replace/4</a></li>
<li title="split-2"><a href="binary.html#split-2">split/2</a></li>
<li title="split-3"><a href="binary.html#split-3">split/3</a></li>
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<li title="bt-1"><a href="c.html#bt-1">bt/1</a></li>
<li title="c-1"><a href="c.html#c-1">c/1</a></li>
<li title="c-2"><a href="c.html#c-2">c/2</a></li>
<li title="cd-1"><a href="c.html#cd-1">cd/1</a></li>
<li title="flush-0"><a href="c.html#flush-0">flush/0</a></li>
<li title="help-0"><a href="c.html#help-0">help/0</a></li>
<li title="i-0"><a href="c.html#i-0">i/0</a></li>
<li title="ni-0"><a href="c.html#ni-0">ni/0</a></li>
<li title="i-3"><a href="c.html#i-3">i/3</a></li>
<li title="l-1"><a href="c.html#l-1">l/1</a></li>
<li title="lc-1"><a href="c.html#lc-1">lc/1</a></li>
<li title="ls-0"><a href="c.html#ls-0">ls/0</a></li>
<li title="ls-1"><a href="c.html#ls-1">ls/1</a></li>
<li title="m-0"><a href="c.html#m-0">m/0</a></li>
<li title="m-1"><a href="c.html#m-1">m/1</a></li>
<li title="memory-0"><a href="c.html#memory-0">memory/0</a></li>
<li title="memory-1"><a href="c.html#memory-1">memory/1</a></li>
<li title="nc-1"><a href="c.html#nc-1">nc/1</a></li>
<li title="nc-2"><a href="c.html#nc-2">nc/2</a></li>
<li title="nl-1"><a href="c.html#nl-1">nl/1</a></li>
<li title="pid-3"><a href="c.html#pid-3">pid/3</a></li>
<li title="pwd-0"><a href="c.html#pwd-0">pwd/0</a></li>
<li title="q-0"><a href="c.html#q-0">q/0</a></li>
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<li title="xm-1"><a href="c.html#xm-1">xm/1</a></li>
<li title="y-1"><a href="c.html#y-1">y/1</a></li>
<li title="y-2"><a href="c.html#y-2">y/2</a></li>
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<li title="date_to_gregorian_days-1"><a href="calendar.html#date_to_gregorian_days-1">date_to_gregorian_days/1</a></li>
<li title="date_to_gregorian_days-3"><a href="calendar.html#date_to_gregorian_days-3">date_to_gregorian_days/3</a></li>
<li title="datetime_to_gregorian_seconds-1"><a href="calendar.html#datetime_to_gregorian_seconds-1">datetime_to_gregorian_seconds/1</a></li>
<li title="day_of_the_week-1"><a href="calendar.html#day_of_the_week-1">day_of_the_week/1</a></li>
<li title="day_of_the_week-3"><a href="calendar.html#day_of_the_week-3">day_of_the_week/3</a></li>
<li title="gregorian_days_to_date-1"><a href="calendar.html#gregorian_days_to_date-1">gregorian_days_to_date/1</a></li>
<li title="gregorian_seconds_to_datetime-1"><a href="calendar.html#gregorian_seconds_to_datetime-1">gregorian_seconds_to_datetime/1</a></li>
<li title="is_leap_year-1"><a href="calendar.html#is_leap_year-1">is_leap_year/1</a></li>
<li title="iso_week_number-0"><a href="calendar.html#iso_week_number-0">iso_week_number/0</a></li>
<li title="iso_week_number-1"><a href="calendar.html#iso_week_number-1">iso_week_number/1</a></li>
<li title="last_day_of_the_month-2"><a href="calendar.html#last_day_of_the_month-2">last_day_of_the_month/2</a></li>
<li title="local_time-0"><a href="calendar.html#local_time-0">local_time/0</a></li>
<li title="local_time_to_universal_time-1"><a href="calendar.html#local_time_to_universal_time-1">local_time_to_universal_time/1</a></li>
<li title="local_time_to_universal_time_dst-1"><a href="calendar.html#local_time_to_universal_time_dst-1">local_time_to_universal_time_dst/1</a></li>
<li title="now_to_local_time-1"><a href="calendar.html#now_to_local_time-1">now_to_local_time/1</a></li>
<li title="now_to_universal_time-1"><a href="calendar.html#now_to_universal_time-1">now_to_universal_time/1</a></li>
<li title="now_to_datetime-1"><a href="calendar.html#now_to_datetime-1">now_to_datetime/1</a></li>
<li title="seconds_to_daystime-1"><a href="calendar.html#seconds_to_daystime-1">seconds_to_daystime/1</a></li>
<li title="seconds_to_time-1"><a href="calendar.html#seconds_to_time-1">seconds_to_time/1</a></li>
<li title="time_difference-2"><a href="calendar.html#time_difference-2">time_difference/2</a></li>
<li title="time_to_seconds-1"><a href="calendar.html#time_to_seconds-1">time_to_seconds/1</a></li>
<li title="universal_time-0"><a href="calendar.html#universal_time-0">universal_time/0</a></li>
<li title="universal_time_to_local_time-1"><a href="calendar.html#universal_time_to_local_time-1">universal_time_to_local_time/1</a></li>
<li title="valid_date-1"><a href="calendar.html#valid_date-1">valid_date/1</a></li>
<li title="valid_date-3"><a href="calendar.html#valid_date-3">valid_date/3</a></li>
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<li title="close-1"><a href="dets.html#close-1">close/1</a></li>
<li title="delete-2"><a href="dets.html#delete-2">delete/2</a></li>
<li title="delete_all_objects-1"><a href="dets.html#delete_all_objects-1">delete_all_objects/1</a></li>
<li title="delete_object-2"><a href="dets.html#delete_object-2">delete_object/2</a></li>
<li title="first-1"><a href="dets.html#first-1">first/1</a></li>
<li title="foldl-3"><a href="dets.html#foldl-3">foldl/3</a></li>
<li title="foldr-3"><a href="dets.html#foldr-3">foldr/3</a></li>
<li title="from_ets-2"><a href="dets.html#from_ets-2">from_ets/2</a></li>
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<li title="info-2"><a href="dets.html#info-2">info/2</a></li>
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<li title="insert-2"><a href="dets.html#insert-2">insert/2</a></li>
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<li title="is_dets_file-1"><a href="dets.html#is_dets_file-1">is_dets_file/1</a></li>
<li title="lookup-2"><a href="dets.html#lookup-2">lookup/2</a></li>
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<li title="repair_continuation-2"><a href="dets.html#repair_continuation-2">repair_continuation/2</a></li>
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<li title="select-1"><a href="dets.html#select-1">select/1</a></li>
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<li title="select-3"><a href="dets.html#select-3">select/3</a></li>
<li title="select_delete-2"><a href="dets.html#select_delete-2">select_delete/2</a></li>
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<li title="traverse-2"><a href="dets.html#traverse-2">traverse/2</a></li>
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<li title="append-3"><a href="dict.html#append-3">append/3</a></li>
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<li title="erase-2"><a href="dict.html#erase-2">erase/2</a></li>
<li title="fetch-2"><a href="dict.html#fetch-2">fetch/2</a></li>
<li title="fetch_keys-1"><a href="dict.html#fetch_keys-1">fetch_keys/1</a></li>
<li title="filter-2"><a href="dict.html#filter-2">filter/2</a></li>
<li title="find-2"><a href="dict.html#find-2">find/2</a></li>
<li title="fold-3"><a href="dict.html#fold-3">fold/3</a></li>
<li title="from_list-1"><a href="dict.html#from_list-1">from_list/1</a></li>
<li title="is_key-2"><a href="dict.html#is_key-2">is_key/2</a></li>
<li title="map-2"><a href="dict.html#map-2">map/2</a></li>
<li title="merge-3"><a href="dict.html#merge-3">merge/3</a></li>
<li title="new-0"><a href="dict.html#new-0">new/0</a></li>
<li title="size-1"><a href="dict.html#size-1">size/1</a></li>
<li title="store-3"><a href="dict.html#store-3">store/3</a></li>
<li title="to_list-1"><a href="dict.html#to_list-1">to_list/1</a></li>
<li title="update-3"><a href="dict.html#update-3">update/3</a></li>
<li title="update-4"><a href="dict.html#update-4">update/4</a></li>
<li title="update_counter-3"><a href="dict.html#update_counter-3">update_counter/3</a></li>
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<li title="add_vertex-1"><a href="digraph.html#add_vertex-1">add_vertex/1</a></li>
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<div id="content">
<div class="innertube">
<!-- refpage --><center><h1>gen_fsm</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">gen_fsm</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">Generic Finite State Machine Behaviour</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>A behaviour module for implementing a finite state machine.
A generic finite state machine process (gen_fsm) implemented
using this module will have a standard set of interface functions
and include functionality for tracing and error reporting. It will
also fit into an OTP supervision tree. Refer to
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','doc/design_principles','fsm.html');">OTP Design Principles</a></span> for more information.</p>
<p>A gen_fsm assumes all specific parts to be located in a callback
module exporting a pre-defined set of functions. The relationship
between the behaviour functions and the callback functions can be
illustrated as follows:</p>
<div class="example"><pre>
gen_fsm module Callback module
-------------- ---------------
gen_fsm:start_link -----> Module:init/1
gen_fsm:send_event -----> Module:StateName/2
gen_fsm:send_all_state_event -----> Module:handle_event/3
gen_fsm:sync_send_event -----> Module:StateName/3
gen_fsm:sync_send_all_state_event -----> Module:handle_sync_event/4
- -----> Module:handle_info/3
- -----> Module:terminate/3
- -----> Module:code_change/4</pre></div>
<p>If a callback function fails or returns a bad value, the gen_fsm
will terminate.</p>
<p>A gen_fsm handles system messages as documented in
<span class="bold_code"><a href="sys.html">sys(3)</a></span>. The <span class="code">sys</span> module
can be used for debugging a gen_fsm.</p>
<p>Note that a gen_fsm does not trap exit signals automatically,
this must be explicitly initiated in the callback module.</p>
<p>Unless otherwise stated, all functions in this module fail if
the specified gen_fsm does not exist or if bad arguments are
given.</p>
<p>The gen_fsm process can go into hibernation
(see <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','erts','erlang.html#erlang:hibernate-3');">erlang(3)</a></span>) if a callback
function specifies <span class="code">'hibernate'</span> instead of a timeout value. This
might be useful if the server is expected to be idle for a long
time. However this feature should be used with care as hibernation
implies at least two garbage collections (when hibernating and
shortly after waking up) and is not something you'd want to do
between each call to a busy state machine.</p>
</p></div>
<h3>EXPORTS</h3>
<p><a name="start_link-3"><span class="bold_code">start_link(Module, Args, Options) -> Result</span></a><br><a name="start_link-4"><span class="bold_code">start_link(FsmName, Module, Args, Options) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">FsmName = {local,Name} | {global,GlobalName}
| {via,Module,ViaName}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Module = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Args = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Options = [Option]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Option = {debug,Dbgs} | {timeout,Time} | {spawn_opt,SOpts}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbgs = [Dbg]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbg = trace | log | statistics</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {log_to_file,FileName} | {install,{Func,FuncState}}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> SOpts = [SOpt]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> SOpt - see erlang:spawn_opt/2,3,4,5</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {ok,Pid} | ignore | {error,Error}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Pid = pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Error = {already_started,Pid} | term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Creates a gen_fsm process as part of a supervision tree.
The function should be called, directly or indirectly, by
the supervisor. It will, among other things, ensure that
the gen_fsm is linked to the supervisor.</p>
<p>The gen_fsm process calls <span class="code">Module:init/1</span> to
initialize. To ensure a synchronized start-up procedure,
<span class="code">start_link/3,4</span> does not return until
<span class="code">Module:init/1</span> has returned.</p>
<p>If <span class="code">FsmName={local,Name}</span>, the gen_fsm is registered
locally as <span class="code">Name</span> using <span class="code">register/2</span>.
If <span class="code">FsmName={global,GlobalName}</span>, the gen_fsm is
registered globally as <span class="code">GlobalName</span> using
<span class="code">global:register_name/2</span>.
If <span class="code">EventMgrName={via,Module,ViaName}</span>, the event manager will
register with the registry represented by <span class="code">Module</span>.
The <span class="code">Module</span> callback should export the functions
<span class="code">register_name/2</span>, <span class="code">unregister_name/1</span>,
<span class="code">whereis_name/1</span> and <span class="code">send/2</span>, which should behave like the
corresponding functions in <span class="code">global</span>. Thus,
<span class="code">{via,global,GlobalName}</span> is a valid reference.</p>
<p>If no name is provided,
the gen_fsm is not registered.</p>
<p><span class="code">Module</span> is the name of the callback module.</p>
<p><span class="code">Args</span> is an arbitrary term which is passed as
the argument to <span class="code">Module:init/1</span>.</p>
<p>If the option <span class="code">{timeout,Time}</span> is present, the gen_fsm
is allowed to spend <span class="code">Time</span> milliseconds initializing
or it will be terminated and the start function will return
<span class="code">{error,timeout}</span>.</p>
<p>If the option <span class="code">{debug,Dbgs}</span> is present,
the corresponding <span class="code">sys</span> function will be called for each
item in <span class="code">Dbgs</span>. See
<span class="bold_code"><a href="sys.html">sys(3)</a></span>.</p>
<p>If the option <span class="code">{spawn_opt,SOpts}</span> is present,
<span class="code">SOpts</span> will be passed as option list to
the <span class="code">spawn_opt</span> BIF which is used to spawn the gen_fsm
process. See
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','erts','erlang.html#spawn_opt-2');">erlang(3)</a></span>.</p>
<div class="note">
<div class="label">Note</div>
<div class="content"><p>
<p>Using the spawn option <span class="code">monitor</span> is currently not
allowed, but will cause the function to fail with reason
<span class="code">badarg</span>.</p>
</p></div>
</div>
<p>If the gen_fsm is successfully created and initialized
the function returns <span class="code">{ok,Pid}</span>, where <span class="code">Pid</span> is
the pid of the gen_fsm. If there already exists a process with
the specified <span class="code">FsmName</span>, the function returns
<span class="code">{error,{already_started,Pid}}</span> where <span class="code">Pid</span> is
the pid of that process.</p>
<p>If <span class="code">Module:init/1</span> fails with <span class="code">Reason</span>,
the function returns <span class="code">{error,Reason}</span>. If
<span class="code">Module:init/1</span> returns <span class="code">{stop,Reason}</span> or
<span class="code">ignore</span>, the process is terminated and the function
returns <span class="code">{error,Reason}</span> or <span class="code">ignore</span>, respectively.</p>
</p></div>
<p><a name="start-3"><span class="bold_code">start(Module, Args, Options) -> Result</span></a><br><a name="start-4"><span class="bold_code">start(FsmName, Module, Args, Options) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">FsmName = {local,Name} | {global,GlobalName}
| {via,Module,ViaName}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Module = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Args = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Options = [Option]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Option = {debug,Dbgs} | {timeout,Time} | {spawn_opt,SOpts}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbgs = [Dbg]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbg = trace | log | statistics</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {log_to_file,FileName} | {install,{Func,FuncState}}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> SOpts = [term()]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {ok,Pid} | ignore | {error,Error}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Pid = pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Error = {already_started,Pid} | term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Creates a stand-alone gen_fsm process, i.e. a gen_fsm which
is not part of a supervision tree and thus has no supervisor.</p>
<p>See <span class="bold_code"><a href="#start_link-3">start_link/3,4</a></span>
for a description of arguments and return values.</p>
</p></div>
<p><a name="send_event-2"><span class="bold_code">send_event(FsmRef, Event) -> ok</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">FsmRef = Name | {Name,Node} | {global,GlobalName}
| {via,Module,ViaName} | pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = Node = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Event = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sends an event asynchronously to the gen_fsm <span class="code">FsmRef</span>
and returns <span class="code">ok</span> immediately. The gen_fsm will call
<span class="code">Module:StateName/2</span> to handle the event, where
<span class="code">StateName</span> is the name of the current state of
the gen_fsm.</p>
<p><span class="code">FsmRef</span> can be:</p>
<ul>
<li>the pid,</li>
<li>
<span class="code">Name</span>, if the gen_fsm is locally registered,</li>
<li>
<span class="code">{Name,Node}</span>, if the gen_fsm is locally
registered at another node, or</li>
<li>
<span class="code">{global,GlobalName}</span>, if the gen_fsm is globally
registered.</li>
<li>
<span class="code">{via,Module,ViaName}</span>, if the event manager is registered
through an alternative process registry.</li>
</ul>
<p><span class="code">Event</span> is an arbitrary term which is passed as one of
the arguments to <span class="code">Module:StateName/2</span>.</p>
</p></div>
<p><a name="send_all_state_event-2"><span class="bold_code">send_all_state_event(FsmRef, Event) -> ok</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">FsmRef = Name | {Name,Node} | {global,GlobalName}
| {via,Module,ViaName} | pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = Node = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Event = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sends an event asynchronously to the gen_fsm <span class="code">FsmRef</span>
and returns <span class="code">ok</span> immediately. The gen_fsm will call
<span class="code">Module:handle_event/3</span> to handle the event.</p>
<p>See <span class="bold_code"><a href="#send_event-2">send_event/2</a></span>
for a description of the arguments.</p>
<p>The difference between <span class="code">send_event</span> and
<span class="code">send_all_state_event</span> is which callback function is
used to handle the event. This function is useful when
sending events that are handled the same way in every state,
as only one <span class="code">handle_event</span> clause is needed to handle
the event instead of one clause in each state name function.</p>
</p></div>
<p><a name="sync_send_event-2"><span class="bold_code">sync_send_event(FsmRef, Event) -> Reply</span></a><br><a name="sync_send_event-3"><span class="bold_code">sync_send_event(FsmRef, Event, Timeout) -> Reply</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">FsmRef = Name | {Name,Node} | {global,GlobalName}
| {via,Module,ViaName} | pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = Node = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Event = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Timeout = int()>0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Reply = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sends an event to the gen_fsm <span class="code">FsmRef</span> and waits until a
reply arrives or a timeout occurs. The gen_fsm will call
<span class="code">Module:StateName/3</span> to handle the event, where
<span class="code">StateName</span> is the name of the current state of
the gen_fsm.</p>
<p>See <span class="bold_code"><a href="#send_event-2">send_event/2</a></span>
for a description of <span class="code">FsmRef</span> and <span class="code">Event</span>.</p>
<p><span class="code">Timeout</span> is an integer greater than zero which
specifies how many milliseconds to wait for a reply, or
the atom <span class="code">infinity</span> to wait indefinitely. Default value
is 5000. If no reply is received within the specified time,
the function call fails.</p>
<p>The return value <span class="code">Reply</span> is defined in the return value
of <span class="code">Module:StateName/3</span>.</p>
<p>The ancient behaviour of sometimes consuming the server
exit message if the server died during the call while
linked to the client has been removed in OTP R12B/Erlang 5.6.</p>
</p></div>
<p><a name="sync_send_all_state_event-2"><span class="bold_code">sync_send_all_state_event(FsmRef, Event) -> Reply</span></a><br><a name="sync_send_all_state_event-3"><span class="bold_code">sync_send_all_state_event(FsmRef, Event, Timeout) -> Reply</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">FsmRef = Name | {Name,Node} | {global,GlobalName}
| {via,Module,ViaName} | pid()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = Node = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Event = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Timeout = int()>0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Reply = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sends an event to the gen_fsm <span class="code">FsmRef</span> and waits until a
reply arrives or a timeout occurs. The gen_fsm will call
<span class="code">Module:handle_sync_event/4</span> to handle the event.</p>
<p>See <span class="bold_code"><a href="#send_event-2">send_event/2</a></span>
for a description of <span class="code">FsmRef</span> and <span class="code">Event</span>. See
<span class="bold_code"><a href="#sync_send_event-3">sync_send_event/3</a></span>
for a description of <span class="code">Timeout</span> and <span class="code">Reply</span>.</p>
<p>See
<span class="bold_code"><a href="#send_all_state_event-2">send_all_state_event/2</a></span>
for a discussion about the difference between
<span class="code">sync_send_event</span> and <span class="code">sync_send_all_state_event</span>.</p>
</p></div>
<p><a name="reply-2"><span class="bold_code">reply(Caller, Reply) -> true</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Caller - see below</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Reply = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function can be used by a gen_fsm to explicitly send a
reply to a client process that called
<span class="bold_code"><a href="#sync_send_event-2">sync_send_event/2,3</a></span>
or
<span class="bold_code"><a href="#sync_send_all_state_event-2">sync_send_all_state_event/2,3</a></span>,
when the reply cannot be defined in the return value of
<span class="code">Module:State/3</span> or <span class="code">Module:handle_sync_event/4</span>.</p>
<p><span class="code">Caller</span> must be the <span class="code">From</span> argument provided to
the callback function. <span class="code">Reply</span> is an arbitrary term,
which will be given back to the client as the return value of
<span class="code">sync_send_event/2,3</span> or
<span class="code">sync_send_all_state_event/2,3</span>.</p>
</p></div>
<p><a name="send_event_after-2"><span class="bold_code">send_event_after(Time, Event) -> Ref</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Time = integer()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Event = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Ref = reference()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sends a delayed event internally in the gen_fsm that calls
this function after <span class="code">Time</span> ms. Returns immediately a
reference that can be used to cancel the delayed send using
<span class="bold_code"><a href="#cancel_timer-1">cancel_timer/1</a></span>.</p>
<p>The gen_fsm will call <span class="code">Module:StateName/2</span> to handle
the event, where <span class="code">StateName</span> is the name of the current
state of the gen_fsm at the time the delayed event is
delivered.</p>
<p><span class="code">Event</span> is an arbitrary term which is passed as one of
the arguments to <span class="code">Module:StateName/2</span>.</p>
</p></div>
<p><a name="start_timer-2"><span class="bold_code">start_timer(Time, Msg) -> Ref</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Time = integer()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Msg = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Ref = reference()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sends a timeout event internally in the gen_fsm that calls
this function after <span class="code">Time</span> ms. Returns immediately a
reference that can be used to cancel the timer using
<span class="bold_code"><a href="#cancel_timer-1">cancel_timer/1</a></span>.</p>
<p>The gen_fsm will call <span class="code">Module:StateName/2</span> to handle
the event, where <span class="code">StateName</span> is the name of the current
state of the gen_fsm at the time the timeout message is
delivered.</p>
<p><span class="code">Msg</span> is an arbitrary term which is passed in the
timeout message, <span class="code">{timeout, Ref, Msg}</span>, as one of
the arguments to <span class="code">Module:StateName/2</span>.</p>
</p></div>
<p><a name="cancel_timer-1"><span class="bold_code">cancel_timer(Ref) -> RemainingTime | false</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Ref = reference()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">RemainingTime = integer()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Cancels an internal timer referred by <span class="code">Ref</span> in the
gen_fsm that calls this function.</p>
<p><span class="code">Ref</span> is a reference returned from
<span class="bold_code"><a href="#send_event_after-2">send_event_after/2</a></span>
or
<span class="bold_code"><a href="#start_timer-2">start_timer/2</a></span>.</p>
<p>If the timer has already timed out, but the event not yet
been delivered, it is cancelled as if it had <strong>not</strong>
timed out, so there will be no false timer event after
returning from this function.</p>
<p>Returns the remaining time in ms until the timer would
have expired if <span class="code">Ref</span> referred to an active timer,
<span class="code">false</span> otherwise.</p>
</p></div>
<p><a name="enter_loop-4"><span class="bold_code">enter_loop(Module, Options, StateName, StateData)</span></a><br><a name="enter_loop-5"><span class="bold_code">enter_loop(Module, Options, StateName, StateData, FsmName)</span></a><br><a name="enter_loop-5"><span class="bold_code">enter_loop(Module, Options, StateName, StateData, Timeout)</span></a><br><a name="enter_loop-6"><span class="bold_code">enter_loop(Module, Options, StateName, StateData, FsmName, Timeout)</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Module = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Options = [Option]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Option = {debug,Dbgs}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbgs = [Dbg]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Dbg = trace | log | statistics</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {log_to_file,FileName} | {install,{Func,FuncState}}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">FsmName = {local,Name} | {global,GlobalName}
| {via,Module,ViaName}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Name = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> GlobalName = ViaName = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Timeout = int() | infinity</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Makes an existing process into a gen_fsm. Does not return,
instead the calling process will enter the gen_fsm receive
loop and become a gen_fsm process. The process <strong>must</strong>
have been started using one of the start functions in
<span class="code">proc_lib</span>, see
<span class="bold_code"><a href="proc_lib.html">proc_lib(3)</a></span>. The user is
responsible for any initialization of the process, including
registering a name for it.</p>
<p>This function is useful when a more complex initialization
procedure is needed than the gen_fsm behaviour provides.</p>
<p><span class="code">Module</span>, <span class="code">Options</span> and <span class="code">FsmName</span> have
the same meanings as when calling
<span class="bold_code"><a href="#start_link-3">start[_link]/3,4</a></span>.
However, if <span class="code">FsmName</span> is specified, the process must have
been registered accordingly <strong>before</strong> this function is
called.</p>
<p><span class="code">StateName</span>, <span class="code">StateData</span> and <span class="code">Timeout</span> have
the same meanings as in the return value of
<span class="bold_code"><a href="#Moduleinit">Module:init/1</a></span>.
Also, the callback module <span class="code">Module</span> does not need to
export an <span class="code">init/1</span> function.</p>
<p>Failure: If the calling process was not started by a
<span class="code">proc_lib</span> start function, or if it is not registered
according to <span class="code">FsmName</span>.</p>
</p></div>
<h3><a name="id182583">CALLBACK FUNCTIONS</a></h3>
<div class="REFBODY">
<p>The following functions should be exported from a <span class="code">gen_fsm</span>
callback module.</p>
<p>In the description, the expression <strong>state name</strong> is used to
denote a state of the state machine. <strong>state data</strong> is used
to denote the internal state of the Erlang process which
implements the state machine.</p>
</div>
<h3>EXPORTS</h3>
<p><a name="Module:init-1"><span class="bold_code">Module:init(Args) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Args = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {ok,StateName,StateData} | {ok,StateName,StateData,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {ok,StateName,StateData,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason} | ignore</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> StateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> StateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<a name="Moduleinit"></a>
<p>Whenever a gen_fsm is started using
<span class="bold_code"><a href="#start-3">gen_fsm:start/3,4</a></span> or
<span class="bold_code"><a href="#start_link-3">gen_fsm:start_link/3,4</a></span>,
this function is called by the new process to initialize.</p>
<p><span class="code">Args</span> is the <span class="code">Args</span> argument provided to the start
function.</p>
<p>If initialization is successful, the function should return
<span class="code">{ok,StateName,StateData}</span>,
<span class="code">{ok,StateName,StateData,Timeout}</span> or <span class="code">{ok,StateName,StateData,hibernate}</span>,
where <span class="code">StateName</span>
is the initial state name and <span class="code">StateData</span> the initial
state data of the gen_fsm.</p>
<p>If an integer timeout value is provided, a timeout will occur
unless an event or a message is received within <span class="code">Timeout</span>
milliseconds. A timeout is represented by the atom
<span class="code">timeout</span> and should be handled by
the <span class="code">Module:StateName/2</span> callback functions. The atom
<span class="code">infinity</span> can be used to wait indefinitely, this is
the default value.</p>
<p>If <span class="code">hibernate</span> is specified instead of a timeout value, the process will go
into hibernation when waiting for the next message to arrive (by calling
<span class="bold_code"><a href="proc_lib.html#hibernate-3">proc_lib:hibernate/3</a></span>).</p>
<p>If something goes wrong during the initialization
the function should return <span class="code">{stop,Reason}</span>, where
<span class="code">Reason</span> is any term, or <span class="code">ignore</span>.</p>
</p></div>
<p><a name="Module:StateName-2"><span class="bold_code">Module:StateName(Event, StateData) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Event = timeout | term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {next_state,NextStateName,NewStateData} </span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NextStateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NewStateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>There should be one instance of this function for each
possible state name. Whenever a gen_fsm receives an event
sent using
<span class="bold_code"><a href="#send_event-2">gen_fsm:send_event/2</a></span>,
the instance of this function with the same name as
the current state name <span class="code">StateName</span> is called to handle
the event. It is also called if a timeout occurs.</p>
<p><span class="code">Event</span> is either the atom <span class="code">timeout</span>, if a timeout
has occurred, or the <span class="code">Event</span> argument provided to
<span class="code">send_event/2</span>.</p>
<p><span class="code">StateData</span> is the state data of the gen_fsm.</p>
<p>If the function returns
<span class="code">{next_state,NextStateName,NewStateData}</span>,
<span class="code">{next_state,NextStateName,NewStateData,Timeout}</span> or
<span class="code">{next_state,NextStateName,NewStateData,hibernate}</span>,
the gen_fsm will continue executing with the current state
name set to <span class="code">NextStateName</span> and with the possibly
updated state data <span class="code">NewStateData</span>. See
<span class="code">Module:init/1</span> for a description of <span class="code">Timeout</span> and <span class="code">hibernate</span>.</p>
<p>If the function returns <span class="code">{stop,Reason,NewStateData}</span>,
the gen_fsm will call
<span class="code">Module:terminate(Reason,NewStateData)</span> and terminate.</p>
</p></div>
<p><a name="Module:handle_event-3"><span class="bold_code">Module:handle_event(Event, StateName, StateData) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Event = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {next_state,NextStateName,NewStateData} </span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NextStateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NewStateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Whenever a gen_fsm receives an event sent using
<span class="bold_code"><a href="#send_all_state_event-2">gen_fsm:send_all_state_event/2</a></span>,
this function is called to handle the event.</p>
<p><span class="code">StateName</span> is the current state name of the gen_fsm.</p>
<p>See <span class="code">Module:StateName/2</span> for a description of the other
arguments and possible return values.</p>
</p></div>
<p><a name="Module:StateName-3"><span class="bold_code">Module:StateName(Event, From, StateData) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Event = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">From = {pid(),Tag}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {reply,Reply,NextStateName,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {reply,Reply,NextStateName,NewStateData,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {reply,Reply,NextStateName,NewStateData,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason,Reply,NewStateData} | {stop,Reason,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reply = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NextStateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NewStateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = normal | term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>There should be one instance of this function for each
possible state name. Whenever a gen_fsm receives an event
sent using
<span class="bold_code"><a href="#sync_send_event-2">gen_fsm:sync_send_event/2,3</a></span>,
the instance of this function with the same name as
the current state name <span class="code">StateName</span> is called to handle
the event.</p>
<p><span class="code">Event</span> is the <span class="code">Event</span> argument provided to
<span class="code">sync_send_event</span>.</p>
<p><span class="code">From</span> is a tuple <span class="code">{Pid,Tag}</span> where <span class="code">Pid</span> is
the pid of the process which called <span class="code">sync_send_event/2,3</span>
and <span class="code">Tag</span> is a unique tag.</p>
<p><span class="code">StateData</span> is the state data of the gen_fsm.</p>
<p>If the function returns
<span class="code">{reply,Reply,NextStateName,NewStateData}</span>,
<span class="code">{reply,Reply,NextStateName,NewStateData,Timeout}</span> or
<span class="code">{reply,Reply,NextStateName,NewStateData,hibernate}</span>,
<span class="code">Reply</span> will be given back to <span class="code">From</span> as the return
value of <span class="code">sync_send_event/2,3</span>. The gen_fsm then
continues executing with the current state name set to
<span class="code">NextStateName</span> and with the possibly updated state data
<span class="code">NewStateData</span>. See <span class="code">Module:init/1</span> for a
description of <span class="code">Timeout</span> and <span class="code">hibernate</span>.</p>
<p>If the function returns
<span class="code">{next_state,NextStateName,NewStateData}</span>,
<span class="code">{next_state,NextStateName,NewStateData,Timeout}</span> or
<span class="code">{next_state,NextStateName,NewStateData,hibernate}</span>,
the gen_fsm will continue executing in <span class="code">NextStateName</span>
with <span class="code">NewStateData</span>. Any reply to <span class="code">From</span> must be
given explicitly using
<span class="bold_code"><a href="#reply-2">gen_fsm:reply/2</a></span>.</p>
<p>If the function returns
<span class="code">{stop,Reason,Reply,NewStateData}</span>, <span class="code">Reply</span> will be
given back to <span class="code">From</span>. If the function returns
<span class="code">{stop,Reason,NewStateData}</span>, any reply to <span class="code">From</span>
must be given explicitly using <span class="code">gen_fsm:reply/2</span>.
The gen_fsm will then call
<span class="code">Module:terminate(Reason,NewStateData)</span> and terminate.</p>
</p></div>
<p><a name="Module:handle_sync_event-4"><span class="bold_code">Module:handle_sync_event(Event, From, StateName, StateData) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Event = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">From = {pid(),Tag}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {reply,Reply,NextStateName,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {reply,Reply,NextStateName,NewStateData,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {reply,Reply,NextStateName,NewStateData,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason,Reply,NewStateData} | {stop,Reason,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reply = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NextStateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NewStateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Whenever a gen_fsm receives an event sent using
<span class="bold_code"><a href="#sync_send_all_state_event-2">gen_fsm:sync_send_all_state_event/2,3</a></span>,
this function is called to handle the event.</p>
<p><span class="code">StateName</span> is the current state name of the gen_fsm.</p>
<p>See <span class="code">Module:StateName/3</span> for a description of the other
arguments and possible return values.</p>
</p></div>
<p><a name="Module:handle_info-3"><span class="bold_code">Module:handle_info(Info, StateName, StateData) -> Result</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Info = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Result = {next_state,NextStateName,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,Timeout}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {next_state,NextStateName,NewStateData,hibernate}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> | {stop,Reason,NewStateData}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NextStateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> NewStateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Timeout = int()>0 | infinity</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Reason = normal | term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function is called by a gen_fsm when it receives any
other message than a synchronous or asynchronous event (or a
system message).</p>
<p><span class="code">Info</span> is the received message.</p>
<p>See <span class="code">Module:StateName/2</span> for a description of the other
arguments and possible return values.</p>
</p></div>
<p><a name="Module:terminate-3"><span class="bold_code">Module:terminate(Reason, StateName, StateData)</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Reason = normal | shutdown | {shutdown,term()} | term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateData = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function is called by a gen_fsm when it is about to
terminate. It should be the opposite of <span class="code">Module:init/1</span>
and do any necessary cleaning up. When it returns, the gen_fsm
terminates with <span class="code">Reason</span>. The return value is ignored.</p>
<p><span class="code">Reason</span> is a term denoting the stop reason,
<span class="code">StateName</span> is the current state name, and
<span class="code">StateData</span> is the state data of the gen_fsm.</p>
<p><span class="code">Reason</span> depends on why the gen_fsm is terminating. If
it is because another callback function has returned a stop
tuple <span class="code">{stop,..}</span>, <span class="code">Reason</span> will have the value
specified in that tuple. If it is due to a failure,
<span class="code">Reason</span> is the error reason.</p>
<p>If the gen_fsm is part of a supervision tree and is ordered
by its supervisor to terminate, this function will be called
with <span class="code">Reason=shutdown</span> if the following conditions apply:</p>
<ul>
<li>the gen_fsm has been set to trap exit signals, and</li>
<li>the shutdown strategy as defined in the supervisor's
child specification is an integer timeout value, not
<span class="code">brutal_kill</span>.</li>
</ul>
<p>Even if the gen_fsm is <strong>not</strong> part of a supervision tree,
this function will be called if it receives an <span class="code">'EXIT'</span>
message from its parent. <span class="code">Reason</span> will be the same as in
the <span class="code">'EXIT'</span> message.</p>
<p>Otherwise, the gen_fsm will be immediately terminated.</p>
<p>Note that for any other reason than <span class="code">normal</span>,
<span class="code">shutdown</span>, or <span class="code">{shutdown,Term}</span> the gen_fsm is
assumed to terminate due to an error and
an error report is issued using
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','kernel','error_logger.html#format-2');">error_logger:format/2</a></span>.</p>
</p></div>
<p><a name="Module:code_change-4"><span class="bold_code">Module:code_change(OldVsn, StateName, StateData, Extra) -> {ok, NextStateName, NewStateData}</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">OldVsn = Vsn | {down, Vsn}</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Vsn = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateName = NextStateName = atom()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateData = NewStateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Extra = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This function is called by a gen_fsm when it should update
its internal state data during a release upgrade/downgrade,
i.e. when the instruction <span class="code">{update,Module,Change,...}</span>
where <span class="code">Change={advanced,Extra}</span> is given in
the <span class="code">appup</span> file. See
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','doc/design_principles','release_handling.html#instr');">OTP Design Principles</a></span>.</p>
<p>In the case of an upgrade, <span class="code">OldVsn</span> is <span class="code">Vsn</span>, and
in the case of a downgrade, <span class="code">OldVsn</span> is
<span class="code">{down,Vsn}</span>. <span class="code">Vsn</span> is defined by the <span class="code">vsn</span>
attribute(s) of the old version of the callback module
<span class="code">Module</span>. If no such attribute is defined, the version is
the checksum of the BEAM file.</p>
<p><span class="code">StateName</span> is the current state name and
<span class="code">StateData</span> the internal state data of the gen_fsm.</p>
<p><span class="code">Extra</span> is passed as-is from the <span class="code">{advanced,Extra}</span>
part of the update instruction.</p>
<p>The function should return the new current state name and
updated internal data.</p>
</p></div>
<p><a name="Module:format_status-2"><span class="bold_code">Module:format_status(Opt, [PDict, StateData]) -> Status</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Opt = normal | terminate</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">PDict = [{Key, Value}]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StateData = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Status = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<div class="note">
<div class="label">Note</div>
<div class="content"><p>
<p>This callback is optional, so callback modules need not
export it. The gen_fsm module provides a default
implementation of this function that returns the callback
module state data.</p>
</p></div>
</div>
<p>This function is called by a gen_fsm process when:</p>
<ul>
<li>One
of <span class="bold_code"><a href="sys.html#get_status-1">sys:get_status/1,2</a></span>
is invoked to get the gen_fsm status. <span class="code">Opt</span> is set to
the atom <span class="code">normal</span> for this case.</li>
<li>The gen_fsm terminates abnormally and logs an
error. <span class="code">Opt</span> is set to the atom <span class="code">terminate</span> for
this case.</li>
</ul>
<p>This function is useful for customising the form and
appearance of the gen_fsm status for these cases. A callback
module wishing to customise the <span class="code">sys:get_status/1,2</span>
return value as well as how its status appears in
termination error logs exports an instance
of <span class="code">format_status/2</span> that returns a term describing the
current status of the gen_fsm.</p>
<p><span class="code">PDict</span> is the current value of the gen_fsm's
process dictionary.</p>
<p><span class="code">StateData</span> is the internal state data of the
gen_fsm.</p>
<p>The function should return <span class="code">Status</span>, a term that
customises the details of the current state and status of
the gen_fsm. There are no restrictions on the
form <span class="code">Status</span> can take, but for
the <span class="code">sys:get_status/1,2</span> case (when <span class="code">Opt</span>
is <span class="code">normal</span>), the recommended form for
the <span class="code">Status</span> value is <span class="code">[{data, [{"StateData",
Term}]}]</span> where <span class="code">Term</span> provides relevant details of
the gen_fsm state data. Following this recommendation isn't
required, but doing so will make the callback module status
consistent with the rest of the <span class="code">sys:get_status/1,2</span>
return value.</p>
<p>One use for this function is to return compact alternative
state data representations to avoid having large state terms
printed in logfiles.</p>
</p></div>
<h3><a name="id183861">SEE ALSO</a></h3>
<div class="REFBODY">
<p><span class="bold_code"><a href="gen_event.html">gen_event(3)</a></span>,
<span class="bold_code"><a href="gen_server.html">gen_server(3)</a></span>,
<span class="bold_code"><a href="supervisor.html">supervisor(3)</a></span>,
<span class="bold_code"><a href="proc_lib.html">proc_lib(3)</a></span>,
<span class="bold_code"><a href="sys.html">sys(3)</a></span></p>
</div>
</div>
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<hr>
<p>Copyright © 1997-2012 Ericsson AB. All Rights Reserved.</p>
</div>
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