mirror of
https://github.com/systemd/systemd.git
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11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
218 lines
9.5 KiB
XML
218 lines
9.5 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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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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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_socket_sockaddr</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_sockaddr</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>const struct sockaddr *<parameter>addr</parameter></paramdef>
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<paramdef>unsigned <parameter>addr_len</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_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 to check
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whether the specified file descriptor refers to a FIFO or pipe. If
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the <parameter>path</parameter> parameter is not
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<constant>NULL</constant>, it is checked whether the FIFO is bound
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to the specified file system path.</para>
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<para><function>sd_is_socket()</function> may be called to check
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whether the specified file descriptor 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 the socket
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is of the specified family (<constant>AF_UNIX</constant>,
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<constant>AF_INET</constant>, …). If the <parameter>type</parameter>
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parameter is not 0, it is checked whether the socket is of the
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specified type (<constant>SOCK_STREAM</constant>,
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<constant>SOCK_DGRAM</constant>, …). If the
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<parameter>listening</parameter> parameter is positive, it is
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checked whether the socket is in accepting mode, i.e.
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<function>listen()</function> has been called for it. If
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<parameter>listening</parameter> is 0, it is checked whether the
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socket is not in this mode. If the parameter is negative, no such
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check is made. The <parameter>listening</parameter> parameter
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should only 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 similar to
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<function>sd_is_socket()</function>, but optionally checks the
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IPv4 or IPv6 port number the socket is bound to, unless
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<parameter>port</parameter> is zero. For this call
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<parameter>family</parameter> must be passed as either
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<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_sockaddr()</function> is similar to
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<function>sd_is_socket_inet()</function>, but checks if the socket is bound to the
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address specified by <parameter>addr</parameter>. The
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<structfield>family</structfield> specified by <parameter>addr</parameter> must be
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either <constant>AF_INET</constant> or <constant>AF_INET6</constant> and
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<parameter>addr_len</parameter> must be large enough for that family. If
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<parameter>addr</parameter> specifies a non-zero port, it is also checked if the
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socket is bound to this port. In addition, for IPv6, if <parameter>addr</parameter>
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specifies non-zero <structfield>sin6_flowinfo</structfield> or
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<structfield>sin6_scope_id</structfield>, it is checked if the socket has the same
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values.</para>
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<para><function>sd_is_socket_unix()</function> is similar to
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<function>sd_is_socket()</function> but optionally checks the
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<constant>AF_UNIX</constant> path the socket is bound to, unless
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the <parameter>path</parameter> parameter is
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<constant>NULL</constant>. For normal file system
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<constant>AF_UNIX</constant> sockets, set the
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<parameter>length</parameter> parameter to 0. For Linux abstract
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namespace sockets, set the <parameter>length</parameter> to the
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size of the address, including the initial 0 byte, and set the
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<parameter>path</parameter> to the initial 0 byte of the socket
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address.</para>
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<para><function>sd_is_mq()</function> may be called to check
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whether the specified file descriptor refers to a POSIX message
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queue. If the <parameter>path</parameter> parameter is not
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<constant>NULL</constant>, it is checked whether the message queue
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is bound to the specified name.</para>
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<para><function>sd_is_special()</function> may be called to check
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whether the specified file descriptor refers to a special file. If
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the <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 filename. Special files in
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this context are character device nodes and files in
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<filename>/proc</filename> 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 errno-style error
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code. If the file descriptor is of the specified type and bound to
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the specified address, a positive return value is returned,
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otherwise 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 descriptor
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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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<citerefentry project='man-pages'><refentrytitle>ip</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>ipv6</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>unix</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>fifo</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>mq_overview</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>socket</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
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</para>
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</refsect1>
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</refentry>
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