mirror of
https://github.com/systemd/systemd.git
synced 2024-11-06 16:59:03 +03:00
201 lines
8.1 KiB
XML
201 lines
8.1 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
|
|
<!--
|
|
This file is part of systemd.
|
|
|
|
Copyright 2010 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
-->
|
|
|
|
<refentry id="sd_is_fifo"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>sd_is_fifo</title>
|
|
<productname>systemd</productname>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<contrib>Developer</contrib>
|
|
<firstname>Lennart</firstname>
|
|
<surname>Poettering</surname>
|
|
<email>lennart@poettering.net</email>
|
|
</author>
|
|
</authorgroup>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>sd_is_fifo</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>sd_is_fifo</refname>
|
|
<refname>sd_is_socket</refname>
|
|
<refname>sd_is_socket_inet</refname>
|
|
<refname>sd_is_socket_unix</refname>
|
|
<refname>sd_is_mq</refname>
|
|
<refname>sd_is_special</refname>
|
|
<refpurpose>Check the type of a file descriptor</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<funcsynopsis>
|
|
<funcsynopsisinfo>#include <systemd/sd-daemon.h></funcsynopsisinfo>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_is_fifo</function></funcdef>
|
|
<paramdef>int <parameter>fd</parameter></paramdef>
|
|
<paramdef>const char *<parameter>path</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_is_socket</function></funcdef>
|
|
<paramdef>int <parameter>fd</parameter></paramdef>
|
|
<paramdef>int <parameter>family</parameter></paramdef>
|
|
<paramdef>int <parameter>type</parameter></paramdef>
|
|
<paramdef>int <parameter>listening</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_is_socket_inet</function></funcdef>
|
|
<paramdef>int <parameter>fd</parameter></paramdef>
|
|
<paramdef>int <parameter>family</parameter></paramdef>
|
|
<paramdef>int <parameter>type</parameter></paramdef>
|
|
<paramdef>int <parameter>listening</parameter></paramdef>
|
|
<paramdef>uint16_t <parameter>port</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_is_socket_unix</function></funcdef>
|
|
<paramdef>int <parameter>fd</parameter></paramdef>
|
|
<paramdef>int <parameter>type</parameter></paramdef>
|
|
<paramdef>int <parameter>listening</parameter></paramdef>
|
|
<paramdef>const char *<parameter>path</parameter></paramdef>
|
|
<paramdef>size_t <parameter>length</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_is_mq</function></funcdef>
|
|
<paramdef>int <parameter>fd</parameter></paramdef>
|
|
<paramdef>const char *<parameter>path</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
<funcprototype>
|
|
<funcdef>int <function>sd_is_special</function></funcdef>
|
|
<paramdef>int <parameter>fd</parameter></paramdef>
|
|
<paramdef>const char *<parameter>path</parameter></paramdef>
|
|
</funcprototype>
|
|
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><function>sd_is_fifo()</function> may be called to check
|
|
whether the specified file descriptor refers to a FIFO or pipe. If
|
|
the <parameter>path</parameter> parameter is not
|
|
<constant>NULL</constant>, it is checked whether the FIFO is bound
|
|
to the specified file system path.</para>
|
|
|
|
<para><function>sd_is_socket()</function> may be called to check
|
|
whether the specified file descriptor refers to a socket. If the
|
|
<parameter>family</parameter> parameter is not
|
|
<constant>AF_UNSPEC</constant>, it is checked whether the socket
|
|
is of the specified family (AF_UNIX, <constant>AF_INET</constant>,
|
|
...). If the <parameter>type</parameter> parameter is not 0, it is
|
|
checked whether the socket is of the specified type
|
|
(<constant>SOCK_STREAM</constant>,
|
|
<constant>SOCK_DGRAM</constant>, ...). If the
|
|
<parameter>listening</parameter> parameter is positive, it is
|
|
checked whether the socket is in accepting mode, i.e.
|
|
<function>listen()</function> has been called for it. If
|
|
<parameter>listening</parameter> is 0, it is checked whether the
|
|
socket is not in this mode. If the parameter is negative, no such
|
|
check is made. The <parameter>listening</parameter> parameter
|
|
should only be used for stream sockets and should be set to a
|
|
negative value otherwise.</para>
|
|
|
|
<para><function>sd_is_socket_inet()</function> is similar to
|
|
<function>sd_is_socket()</function>, but optionally checks the
|
|
IPv4 or IPv6 port number the socket is bound to, unless
|
|
<parameter>port</parameter> is zero. For this call
|
|
<parameter>family</parameter> must be passed as either
|
|
<constant>AF_UNSPEC</constant>, <constant>AF_INET</constant>, or
|
|
<constant>AF_INET6</constant>.</para>
|
|
|
|
<para><function>sd_is_socket_unix()</function> is similar to
|
|
<function>sd_is_socket()</function> but optionally checks the
|
|
<constant>AF_UNIX</constant> path the socket is bound to, unless
|
|
the <parameter>path</parameter> parameter is
|
|
<constant>NULL</constant>. For normal file system
|
|
<constant>AF_UNIX</constant> sockets, set the
|
|
<parameter>length</parameter> parameter to 0. For Linux abstract
|
|
namespace sockets, set the <parameter>length</parameter> to the
|
|
size of the address, including the initial 0 byte, and set the
|
|
<parameter>path</parameter> to the initial 0 byte of the socket
|
|
address.</para>
|
|
|
|
<para><function>sd_is_mq()</function> may be called to check
|
|
whether the specified file descriptor refers to a POSIX message
|
|
queue. If the <parameter>path</parameter> parameter is not
|
|
<constant>NULL</constant>, it is checked whether the message queue
|
|
is bound to the specified name.</para>
|
|
|
|
<para><function>sd_is_special()</function> may be called to check
|
|
whether the specified file descriptor refers to a special file. If
|
|
the <parameter>path</parameter> parameter is not
|
|
<constant>NULL</constant>, it is checked whether the file
|
|
descriptor is bound to the specified file name. Special files in
|
|
this context are character device nodes and files in
|
|
<filename>/proc</filename> or <filename>/sys</filename>.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Return Value</title>
|
|
|
|
<para>On failure, these calls return a negative errno-style error
|
|
code. If the file descriptor is of the specified type and bound to
|
|
the specified address, a positive return value is returned,
|
|
otherwise zero.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Notes</title>
|
|
|
|
<xi:include href="libsystemd-pkgconfig.xml" xpointer="pkgconfig-text"/>
|
|
|
|
<para>Internally, these function use a combination of
|
|
<filename>fstat()</filename> and
|
|
<filename>getsockname()</filename> to check the file descriptor
|
|
type and where it is bound to.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|