mirror of
https://github.com/sigmasternchen/php-doc-en
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139 lines
4.8 KiB
XML
139 lines
4.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.pcntl-wait" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>pcntl_wait</refname>
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<refpurpose>Waits on or returns the status of a forked child</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>int</type><methodname>pcntl_wait</methodname>
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<methodparam><type>int</type><parameter role="reference">status</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
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<methodparam choice="opt"><type>array</type><parameter role="reference">resource_usage</parameter><initializer>[]</initializer></methodparam>
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</methodsynopsis>
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<para>
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The wait function suspends execution of the current process until a
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child has exited, or until a signal is delivered whose action is to
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terminate the current process or to call a signal handling function. If a
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child has already exited by the time of the call (a so-called "zombie"
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process), the function returns immediately. Any system resources used by
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the child are freed. Please see your system's wait(2) man page for
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specific details as to how wait works on your system.
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</para>
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<note>
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<para>
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This function is equivalent to calling <function>pcntl_waitpid</function>
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with a <literal>-1</literal> <parameter>process_id</parameter> and no
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<parameter>flags</parameter>.
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</para>
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</note>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>status</parameter></term>
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<listitem>
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<para>
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<function>pcntl_wait</function> will store status information
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in the <parameter>status</parameter> parameter which can be
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evaluated using the following functions:
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<function>pcntl_wifexited</function>,
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<function>pcntl_wifstopped</function>,
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<function>pcntl_wifsignaled</function>,
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<function>pcntl_wexitstatus</function>,
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<function>pcntl_wtermsig</function> and
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<function>pcntl_wstopsig</function>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>flags</parameter></term>
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<listitem>
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<para>
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If wait3 is available on your system (mostly BSD-style systems), you can
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provide the optional <parameter>flags</parameter> parameter. If this
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parameter is not provided, wait will be used for the system call. If
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wait3 is not available, providing a value for <parameter>flags</parameter>
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will have no effect. The value of <parameter>flags</parameter>
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is the value of zero or more of the following two constants
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<literal>OR</literal>'ed together:
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<table>
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<title>Possible values for <parameter>flags</parameter></title>
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<tgroup cols="2">
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<tbody>
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<row>
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<entry><literal>WNOHANG</literal></entry>
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<entry>
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Return immediately if no child has exited.
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</entry>
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</row>
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<row>
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<entry><literal>WUNTRACED</literal></entry>
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<entry>
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Return for children which are stopped, and whose status has
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not been reported.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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<function>pcntl_wait</function> returns the process ID of the
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child which exited, -1 on error or zero if WNOHANG was provided as an
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option (on wait3-available systems) and no child was available.
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>pcntl_fork</function></member>
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<member><function>pcntl_signal</function></member>
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<member><function>pcntl_wifexited</function></member>
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<member><function>pcntl_wifstopped</function></member>
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<member><function>pcntl_wifsignaled</function></member>
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<member><function>pcntl_wexitstatus</function></member>
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<member><function>pcntl_wtermsig</function></member>
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<member><function>pcntl_wstopsig</function></member>
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<member><function>pcntl_waitpid</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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