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3b3d7d069d
Shift the asterisks in the documentation's prototypes such that they are consistent among each other. Use the right side to match what is used in source code. Addendum to commit v209~82.
209 lines
10 KiB
XML
209 lines
10 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_is_fifo"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_is_fifo</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_is_fifo</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_is_fifo</refname>
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<refname>sd_is_socket</refname>
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<refname>sd_is_socket_inet</refname>
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<refname>sd_is_socket_unix</refname>
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<refname>sd_is_mq</refname>
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<refname>sd_is_special</refname>
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<refpurpose>Check the type of a file descriptor</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-daemon.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_is_fifo</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_is_socket</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>family</parameter></paramdef>
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<paramdef>int <parameter>type</parameter></paramdef>
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<paramdef>int <parameter>listening</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_is_socket_inet</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>family</parameter></paramdef>
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<paramdef>int <parameter>type</parameter></paramdef>
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<paramdef>int <parameter>listening</parameter></paramdef>
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<paramdef>uint16_t <parameter>port</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_is_socket_unix</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>type</parameter></paramdef>
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<paramdef>int <parameter>listening</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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<paramdef>size_t <parameter>length</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_is_mq</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_is_special</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>const char *<parameter>path</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_is_fifo()</function> may be called
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to check whether the specified file descriptor refers
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to a FIFO or pipe. If the <parameter>path</parameter>
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parameter is not <constant>NULL</constant>, it is
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checked whether the FIFO is bound to the specified
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file system path.</para>
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<para><function>sd_is_socket()</function> may be
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called to check whether the specified file descriptor
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refers to a socket. If the
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<parameter>family</parameter> parameter is not
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<constant>AF_UNSPEC</constant>, it is checked whether
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the socket is of the specified family (AF_UNIX,
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<constant>AF_INET</constant>, ...). If the
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<parameter>type</parameter> parameter is not 0, it is
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checked whether the socket is of the specified type
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(<constant>SOCK_STREAM</constant>,
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<constant>SOCK_DGRAM</constant>, ...). If the
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<parameter>listening</parameter> parameter is positive,
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it is checked whether the socket is in accepting mode,
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i.e. <function>listen()</function> has been called for
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it. If <parameter>listening</parameter> is 0, it is
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checked whether the socket is not in this mode. If the
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parameter is negative, no such check is made. The
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<parameter>listening</parameter> parameter should only
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be used for stream sockets and should be set to a
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negative value otherwise.</para>
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<para><function>sd_is_socket_inet()</function> is
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similar to <function>sd_is_socket()</function>, but
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optionally checks the IPv4 or IPv6 port number the
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socket is bound to, unless <parameter>port</parameter>
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is zero. For this call <parameter>family</parameter>
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must be passed as either <constant>AF_UNSPEC</constant>, <constant>AF_INET</constant>, or
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<constant>AF_INET6</constant>.</para>
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<para><function>sd_is_socket_unix()</function> is
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similar to <function>sd_is_socket()</function> but
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optionally checks the <constant>AF_UNIX</constant> path the socket is bound
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to, unless the <parameter>path</parameter> parameter
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is <constant>NULL</constant>. For normal file system <constant>AF_UNIX</constant> sockets,
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set the <parameter>length</parameter> parameter to 0. For
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Linux abstract namespace sockets, set the
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<parameter>length</parameter> to the size of the
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address, including the initial 0 byte, and set the
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<parameter>path</parameter> to the initial 0 byte of
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the socket address.</para>
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<para><function>sd_is_mq()</function> may be called to
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check whether the specified file descriptor refers to
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a POSIX message queue. If the
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<parameter>path</parameter> parameter is not
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<constant>NULL</constant>, it is checked whether the
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message queue is bound to the specified name.</para>
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<para><function>sd_is_special()</function> may be
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called to check whether the specified file descriptor
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refers to a special file. If the
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<parameter>path</parameter> parameter is not
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<constant>NULL</constant>, it is checked whether the file
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descriptor is bound to the specified file
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name. Special files in this context are character
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device nodes and files in <filename>/proc</filename>
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or <filename>/sys</filename>.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On failure, these calls return a negative
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errno-style error code. If the file descriptor is of
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the specified type and bound to the specified address,
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a positive return value is returned, otherwise
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zero.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<xi:include href="libsystemd-pkgconfig.xml" xpointer="pkgconfig-text"/>
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<para>Internally, these function use a combination of
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<filename>fstat()</filename> and
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<filename>getsockname()</filename> to check the file
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descriptor type and where it is bound to.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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