<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html xmlns:fn="http://www.w3.org/2005/02/xpath-functions"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link rel="stylesheet" href="../../../doc/otp_doc.css" type="text/css"> <title>Erlang -- erl_prim_loader</title> </head> <body bgcolor="white" text="#000000" link="#0000ff" vlink="#ff00ff" alink="#ff0000"><div id="container"> <script id="js" type="text/javascript" language="JavaScript" src="../../../doc/js/flipmenu/flipmenu.js"></script><script id="js2" type="text/javascript" src="../../../doc/js/erlresolvelinks.js"></script><script language="JavaScript" type="text/javascript"> <!-- function getWinHeight() { var myHeight = 0; if( typeof( window.innerHeight ) == 'number' ) { //Non-IE myHeight = window.innerHeight; } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) { //IE 6+ in 'standards compliant mode' myHeight = 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href="../../../doc/index.html">Top</a></small><p><strong>Erlang Run-Time System Application (ERTS)</strong><br><strong>Reference Manual</strong><br><small>Version 5.7.5</small></p> <br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Table of Contents</strong></small></p> <ul class="flipMenu"> <li id="loadscrollpos" title="erl_prim_loader " expanded="true">erl_prim_loader<ul> <li><a href="erl_prim_loader.html"> Top of manual page </a></li> <li title="start-3"><a href="erl_prim_loader.html#start-3">start/3</a></li> <li title="get_file-1"><a href="erl_prim_loader.html#get_file-1">get_file/1</a></li> <li title="get_path-0"><a href="erl_prim_loader.html#get_path-0">get_path/0</a></li> <li title="list_dir-1"><a href="erl_prim_loader.html#list_dir-1">list_dir/1</a></li> <li title="read_file_info-1"><a href="erl_prim_loader.html#read_file_info-1">read_file_info/1</a></li> <li title="set_path-1"><a 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href="erlang.html#hibernate-3">hibernate/3</a></li> <li title="integer_to_list-1"><a href="erlang.html#integer_to_list-1">integer_to_list/1</a></li> <li title="integer_to_list-2"><a href="erlang.html#integer_to_list-2">integer_to_list/2</a></li> <li title="iolist_to_binary-1"><a href="erlang.html#iolist_to_binary-1">iolist_to_binary/1</a></li> <li title="iolist_size-1"><a href="erlang.html#iolist_size-1">iolist_size/1</a></li> <li title="is_alive-0"><a href="erlang.html#is_alive-0">is_alive/0</a></li> <li title="is_atom-1"><a href="erlang.html#is_atom-1">is_atom/1</a></li> <li title="is_binary-1"><a href="erlang.html#is_binary-1">is_binary/1</a></li> <li title="is_bitstring-1"><a href="erlang.html#is_bitstring-1">is_bitstring/1</a></li> <li title="is_boolean-1"><a href="erlang.html#is_boolean-1">is_boolean/1</a></li> <li title="is_builtin-3"><a href="erlang.html#is_builtin-3">is_builtin/3</a></li> <li title="is_float-1"><a href="erlang.html#is_float-1">is_float/1</a></li> <li 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href="erlang.html#length-1">length/1</a></li> <li title="link-1"><a href="erlang.html#link-1">link/1</a></li> <li title="list_to_atom-1"><a href="erlang.html#list_to_atom-1">list_to_atom/1</a></li> <li title="list_to_binary-1"><a href="erlang.html#list_to_binary-1">list_to_binary/1</a></li> <li title="list_to_bitstring-1"><a href="erlang.html#list_to_bitstring-1">list_to_bitstring/1</a></li> <li title="list_to_existing_atom-1"><a href="erlang.html#list_to_existing_atom-1">list_to_existing_atom/1</a></li> <li title="list_to_float-1"><a href="erlang.html#list_to_float-1">list_to_float/1</a></li> <li title="list_to_integer-1"><a href="erlang.html#list_to_integer-1">list_to_integer/1</a></li> <li title="list_to_integer-2"><a href="erlang.html#list_to_integer-2">list_to_integer/2</a></li> <li title="list_to_pid-1"><a href="erlang.html#list_to_pid-1">list_to_pid/1</a></li> <li title="list_to_tuple-1"><a href="erlang.html#list_to_tuple-1">list_to_tuple/1</a></li> <li title="load_module-2"><a href="erlang.html#load_module-2">load_module/2</a></li> <li title="load_nif-2"><a href="erlang.html#load_nif-2">load_nif/2</a></li> <li title="loaded-0"><a href="erlang.html#loaded-0">loaded/0</a></li> <li title="localtime-0"><a href="erlang.html#localtime-0">localtime/0</a></li> <li title="localtime_to_universaltime-1"><a href="erlang.html#localtime_to_universaltime-1">localtime_to_universaltime/1</a></li> <li title="localtime_to_universaltime-2"><a href="erlang.html#localtime_to_universaltime-2">localtime_to_universaltime/2</a></li> <li title="make_ref-0"><a href="erlang.html#make_ref-0">make_ref/0</a></li> <li title="make_tuple-2"><a href="erlang.html#make_tuple-2">make_tuple/2</a></li> <li title="make_tuple-3"><a href="erlang.html#make_tuple-3">make_tuple/3</a></li> <li title="max-2"><a href="erlang.html#max-2">max/2</a></li> <li title="md5-1"><a href="erlang.html#md5-1">md5/1</a></li> <li title="md5_final-1"><a href="erlang.html#md5_final-1">md5_final/1</a></li> <li title="md5_init-0"><a href="erlang.html#md5_init-0">md5_init/0</a></li> <li title="md5_update-2"><a href="erlang.html#md5_update-2">md5_update/2</a></li> <li title="memory-0"><a href="erlang.html#memory-0">memory/0</a></li> <li title="memory-1"><a href="erlang.html#memory-1">memory/1</a></li> <li title="min-2"><a href="erlang.html#min-2">min/2</a></li> <li title="module_loaded-1"><a href="erlang.html#module_loaded-1">module_loaded/1</a></li> <li title="monitor-2"><a href="erlang.html#monitor-2">monitor/2</a></li> <li title="monitor_node-2"><a href="erlang.html#monitor_node-2">monitor_node/2</a></li> <li title="monitor_node-3"><a href="erlang.html#monitor_node-3">monitor_node/3</a></li> <li title="node-0"><a href="erlang.html#node-0">node/0</a></li> <li title="node-1"><a href="erlang.html#node-1">node/1</a></li> <li title="nodes-0"><a href="erlang.html#nodes-0">nodes/0</a></li> <li title="nodes-1"><a href="erlang.html#nodes-1">nodes/1</a></li> <li title="now-0"><a 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href="erlang.html#port_info-2">port_info/2</a></li> <li title="port_to_list-1"><a href="erlang.html#port_to_list-1">port_to_list/1</a></li> <li title="ports-0"><a href="erlang.html#ports-0">ports/0</a></li> <li title="pre_loaded-0"><a href="erlang.html#pre_loaded-0">pre_loaded/0</a></li> <li title="process_display-2"><a href="erlang.html#process_display-2">process_display/2</a></li> <li title="process_flag-2"><a href="erlang.html#process_flag-2">process_flag/2</a></li> <li title="process_flag-3"><a href="erlang.html#process_flag-3">process_flag/3</a></li> <li title="process_info-1"><a href="erlang.html#process_info-1">process_info/1</a></li> <li title="process_info-2"><a href="erlang.html#process_info-2">process_info/2</a></li> <li title="processes-0"><a href="erlang.html#processes-0">processes/0</a></li> <li title="purge_module-1"><a href="erlang.html#purge_module-1">purge_module/1</a></li> <li title="put-2"><a href="erlang.html#put-2">put/2</a></li> <li title="raise-3"><a href="erlang.html#raise-3">raise/3</a></li> <li title="read_timer-1"><a href="erlang.html#read_timer-1">read_timer/1</a></li> <li title="ref_to_list-1"><a href="erlang.html#ref_to_list-1">ref_to_list/1</a></li> <li title="register-2"><a href="erlang.html#register-2">register/2</a></li> <li title="registered-0"><a href="erlang.html#registered-0">registered/0</a></li> <li title="resume_process-1"><a href="erlang.html#resume_process-1">resume_process/1</a></li> <li title="round-1"><a href="erlang.html#round-1">round/1</a></li> <li title="self-0"><a href="erlang.html#self-0">self/0</a></li> <li title="send-2"><a href="erlang.html#send-2">send/2</a></li> <li title="send-3"><a href="erlang.html#send-3">send/3</a></li> <li title="send_after-3"><a href="erlang.html#send_after-3">send_after/3</a></li> <li title="send_nosuspend-2"><a href="erlang.html#send_nosuspend-2">send_nosuspend/2</a></li> <li title="send_nosuspend-3"><a href="erlang.html#send_nosuspend-3">send_nosuspend/3</a></li> <li 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href="erlang.html#spawn_monitor-3">spawn_monitor/3</a></li> <li title="spawn_opt-2"><a href="erlang.html#spawn_opt-2">spawn_opt/2</a></li> <li title="spawn_opt-3"><a href="erlang.html#spawn_opt-3">spawn_opt/3</a></li> <li title="spawn_opt-4"><a href="erlang.html#spawn_opt-4">spawn_opt/4</a></li> <li title="spawn_opt-5"><a href="erlang.html#spawn_opt-5">spawn_opt/5</a></li> <li title="split_binary-2"><a href="erlang.html#split_binary-2">split_binary/2</a></li> <li title="start_timer-3"><a href="erlang.html#start_timer-3">start_timer/3</a></li> <li title="statistics-1"><a href="erlang.html#statistics-1">statistics/1</a></li> <li title="suspend_process-2"><a href="erlang.html#suspend_process-2">suspend_process/2</a></li> <li title="suspend_process-1"><a href="erlang.html#suspend_process-1">suspend_process/1</a></li> <li title="system_flag-2"><a href="erlang.html#system_flag-2">system_flag/2</a></li> <li title="system_info-1"><a href="erlang.html#system_info-1">system_info/1</a></li> <li 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href="erl_nif.html#enif_rwlock_runlock">enif_rwlock_runlock() </a></li> <li title="enif_rwlock_rwlock"><a href="erl_nif.html#enif_rwlock_rwlock">enif_rwlock_rwlock() </a></li> <li title="enif_rwlock_rwunlock"><a href="erl_nif.html#enif_rwlock_rwunlock">enif_rwlock_rwunlock() </a></li> <li title="enif_rwlock_tryrlock"><a href="erl_nif.html#enif_rwlock_tryrlock">enif_rwlock_tryrlock() </a></li> <li title="enif_rwlock_tryrwlock"><a href="erl_nif.html#enif_rwlock_tryrwlock">enif_rwlock_tryrwlock() </a></li> <li title="enif_sizeof_resource"><a href="erl_nif.html#enif_sizeof_resource">enif_sizeof_resource() </a></li> <li title="enif_system_info"><a href="erl_nif.html#enif_system_info">enif_system_info() </a></li> <li title="enif_thread_create"><a href="erl_nif.html#enif_thread_create">enif_thread_create() </a></li> <li title="enif_thread_exit"><a href="erl_nif.html#enif_thread_exit">enif_thread_exit() </a></li> <li title="enif_thread_join"><a href="erl_nif.html#enif_thread_join">enif_thread_join() </a></li> <li title="enif_thread_opts_create"><a href="erl_nif.html#enif_thread_opts_create">enif_thread_opts_create() </a></li> <li title="enif_thread_opts_destroy"><a href="erl_nif.html#enif_thread_opts_destroy">enif_thread_opts_destroy() </a></li> <li title="enif_thread_self"><a href="erl_nif.html#enif_thread_self">enif_thread_self() </a></li> <li title="enif_tsd_key_create"><a href="erl_nif.html#enif_tsd_key_create">enif_tsd_key_create() </a></li> <li title="enif_tsd_key_destroy"><a href="erl_nif.html#enif_tsd_key_destroy">enif_tsd_key_destroy() </a></li> <li title="enif_tsd_get"><a href="erl_nif.html#enif_tsd_get">enif_tsd_get() </a></li> <li title="enif_tsd_set"><a href="erl_nif.html#enif_tsd_set">enif_tsd_set() </a></li> </ul> </li> </ul> </div></div> <div id="content"> <div class="innertube"> <!-- refpage --><center><h1>erl_prim_loader</h1></center> <h3>MODULE</h3> <div class="REFBODY">erl_prim_loader</div> <h3>MODULE SUMMARY</h3> <div class="REFBODY">Low Level Erlang Loader</div> <h3>DESCRIPTION</h3> <div class="REFBODY"><p> <p><span class="code">erl_prim_loader</span> is used to load all Erlang modules into the system. The start script is also fetched with this low level loader.</p> <p><span class="code">erl_prim_loader</span> knows about the environment and how to fetch modules. The loader could, for example, fetch files using the file system (with absolute file names as input), or a database (where the binary format of a module is stored).</p> <p>The <span class="code">-loader Loader</span> command line flag can be used to choose the method used by the <span class="code">erl_prim_loader</span>. Two <span class="code">Loader</span> methods are supported by the Erlang runtime system: <span class="code">efile</span> and <span class="code">inet</span>. If another loader is required, then it has to be implemented by the user. The <span class="code">Loader</span> provided by the user must fulfill the protocol defined below, and it is started with the <span class="code">erl_prim_loader</span> by evaluating <span class="code">open_port({spawn,Loader},[binary])</span>.</p> <div class="warning"> <div class="label">Warning</div> <div class="content"><p><p>The support for loading of code from archive files is experimental. The sole purpose of releasing it before it is ready is to obtain early feedback. The file format, semantics, interfaces etc. may be changed in a future release. The functions <span class="code">list_dir/1</span> and <span class="code">read_file_info/1</span> as well as the flag <span class="code">-loader_debug</span> are also experimental</p></p></div> </div> </p></div> <h3>EXPORTS</h3> <p><a name="start-3"><span class="bold_code">start(Id, Loader, Hosts) -> {ok, Pid} | {error, What}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Id = term()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Loader = atom() | string()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Hosts = [Host]</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Host = atom()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Pid = pid()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">What = term()</span><br> </div> </div> <div class="REFBODY"><p> <p>Starts the Erlang low level loader. This function is called by the <span class="code">init</span> process (and module). The <span class="code">init</span> process reads the command line flags <span class="code">-id Id</span>, <span class="code">-loader Loader</span>, and <span class="code">-hosts Hosts</span>. These are the arguments supplied to the <span class="code">start/3</span> function.</p> <p>If <span class="code">-loader</span> is not given, the default loader is <span class="code">efile</span> which tells the system to read from the file system.</p> <p>If <span class="code">-loader</span> is <span class="code">inet</span>, the <span class="code">-id Id</span>, <span class="code">-hosts Hosts</span>, and <span class="code">-setcookie Cookie</span> flags must also be supplied. <span class="code">Hosts</span> identifies hosts which this node can contact in order to load modules. One Erlang runtime system with a <span class="code">erl_boot_server</span> process must be started on each of hosts given in <span class="code">Hosts</span> in order to answer the requests. See <span class="bold_code"><a href="javascript:erlhref('../../../doc/../','kernel','erl_boot_server.html');">erl_boot_server(3)</a></span>.</p> <p>If <span class="code">-loader</span> is something else, the given port program is started. The port program is supposed to follow the protocol specified below.</p> </p></div> <p><a name="get_file-1"><span class="bold_code">get_file(Filename) -> {ok, Bin, FullName} | error</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Filename = string()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Bin = binary()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">FullName = string()</span><br> </div> </div> <div class="REFBODY"><p> <p>This function fetches a file using the low level loader. <span class="code">Filename</span> is either an absolute file name or just the name of the file, for example <span class="code">"lists.beam"</span>. If an internal path is set to the loader, this path is used to find the file. If a user supplied loader is used, the path can be stripped off if it is obsolete, and the loader does not use a path. <span class="code">FullName</span> is the complete name of the fetched file. <span class="code">Bin</span> is the contents of the file as a binary.</p> <p>The <span class="code">Filename</span> can also be a file in an archive. For example <span class="code">/otp/root/lib/mnesia-4.4.7.ez/mnesia-4.4.7/ebin/mnesia_backup.beam</span> See <span class="bold_code"><a href="javascript:erlhref('../../../doc/../','kernel','code.html');">code(3)</a></span> about archive files.</p> </p></div> <p><a name="get_path-0"><span class="bold_code">get_path() -> {ok, Path}</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Path = [Dir]</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Dir = string()</span><br> </div> </div> <div class="REFBODY"><p> <p>This function gets the path set in the loader. The path is set by the <span class="code">init</span> process according to information found in the start script.</p> </p></div> <p><a name="list_dir-1"><span class="bold_code">list_dir(Dir) -> {ok, Filenames} | error</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Dir = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Filenames = [Filename]</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Filename = string()</span><br> </div> </div> <div class="REFBODY"><p> <p>Lists all the files in a directory. Returns <span class="code">{ok, Filenames}</span> if successful. Otherwise, it returns <span class="code">error</span>. <span class="code">Filenames</span> is a list of the names of all the files in the directory. The names are not sorted.</p> <p>The <span class="code">Dir</span> can also be a directory in an archive. For example <span class="code">/otp/root/lib/mnesia-4.4.7.ez/mnesia-4.4.7/ebin</span> See <span class="bold_code"><a href="javascript:erlhref('../../../doc/../','kernel','code.html');">code(3)</a></span> about archive files.</p> </p></div> <p><a name="read_file_info-1"><span class="bold_code">read_file_info(Filename) -> {ok, FileInfo} | error</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Filename = name()</span><br> </div> <div class="REFTYPES"> <span class="bold_code">FileInfo = #file_info{}</span><br> </div> </div> <div class="REFBODY"><p> <p>Retrieves information about a file. Returns <span class="code">{ok, FileInfo}</span> if successful, otherwise <span class="code">error</span>. <span class="code">FileInfo</span> is a record <span class="code">file_info</span>, defined in the Kernel include file <span class="code">file.hrl</span>. Include the following directive in the module from which the function is called:</p> <div class="example"><pre> -include_lib("kernel/include/file.hrl").</pre></div> <p>See <span class="bold_code"><a href="javascript:erlhref('../../../doc/../','kernel','file.html');">file(3)</a></span> for more info about the record <span class="code">file_info</span>.</p> <p>The <span class="code">Filename</span> can also be a file in an archive. For example <span class="code">/otp/root/lib/mnesia-4.4.7.ez/mnesia-4.4.7/ebin/mnesia_backup.beam</span> See <span class="bold_code"><a href="javascript:erlhref('../../../doc/../','kernel','code.html');">code(3)</a></span> about archive files.</p> </p></div> <p><a name="set_path-1"><span class="bold_code">set_path(Path) -> ok</span></a><br></p> <div class="REFBODY"> <p>Types:</p> <div class="REFTYPES"> <span class="bold_code">Path = [Dir]</span><br> </div> <div class="REFTYPES"> <span class="bold_code">Dir = string()</span><br> </div> </div> <div class="REFBODY"><p> <p>This function sets the path of the loader if <span class="code">init</span> interprets a <span class="code">path</span> command in the start script.</p> </p></div> <h3><a name="id2295835">Protocol</a></h3> <div class="REFBODY"> <p>The following protocol must be followed if a user provided loader port program is used. The <span class="code">Loader</span> port program is started with the command <span class="code">open_port({spawn,Loader},[binary])</span>. The protocol is as follows:</p> <div class="example"><pre> Function Send Receive ------------------------------------------------------------- get_file [102 | FileName] [121 | BinaryFile] (on success) [122] (failure) stop eof terminate</pre></div> </div> <h3><a name="id2296416">Command Line Flags</a></h3> <div class="REFBODY"> <p>The <span class="code">erl_prim_loader</span> module interprets the following command line flags:</p> <dl> <dt><strong><span class="code">-loader Loader</span></strong></dt> <dd> <p>Specifies the name of the loader used by <span class="code">erl_prim_loader</span>. <span class="code">Loader</span> can be <span class="code">efile</span> (use the local file system), or <span class="code">inet</span> (load using the <span class="code">boot_server</span> on another Erlang node). If <span class="code">Loader</span> is user defined, the defined <span class="code">Loader</span> port program is started.</p> <p>If the <span class="code">-loader</span> flag is omitted, it defaults to <span class="code">efile</span>.</p> </dd> <dt><strong><span class="code">-loader_debug</span></strong></dt> <dd> <p>Makes the <span class="code">efile</span> loader write some debug information, such as the reason for failures, while it handles files.</p> </dd> <dt><strong><span class="code">-hosts Hosts</span></strong></dt> <dd> <p>Specifies which other Erlang nodes the <span class="code">inet</span> loader can use. This flag is mandatory if the <span class="code">-loader inet</span> flag is present. On each host, there must be on Erlang node with the <span class="code">erl_boot_server</span> which handles the load requests. <span class="code">Hosts</span> is a list of IP addresses (hostnames are not acceptable).</p> </dd> <dt><strong><span class="code">-id Id</span></strong></dt> <dd> <p>Specifies the identity of the Erlang runtime system. If the system runs as a distributed node, <span class="code">Id</span> must be identical to the name supplied with the <span class="code">-sname</span> or <span class="code">-name</span> distribution flags.</p> </dd> <dt><strong><span class="code">-setcookie Cookie</span></strong></dt> <dd> <p>Specifies the cookie of the Erlang runtime system. This flag is mandatory if the <span class="code">-loader inet</span> flag is present.</p> </dd> </dl> </div> <h3><a name="id2251860">SEE ALSO</a></h3> <div class="REFBODY"> <p><span class="bold_code"><a href="init.html">init(3)</a></span>, <span class="bold_code"><a href="javascript:erlhref('../../../doc/../','kernel','erl_boot_server.html');">erl_boot_server(3)</a></span></p> </div> </div> <div class="footer"> <hr> <p>Copyright © 1997-2010 Ericsson AB. All Rights Reserved.</p> </div> </div> </div></body> </html>