Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 208 insertions, 0 deletions

diff --git a/man/sd_is_fifo.xml b/man/sd_is_fifo.xml
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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_is_fifo"
+  xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>sd_is_fifo</title>
+    <productname>systemd</productname>
+  </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_socket_sockaddr</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 &lt;systemd/sd-daemon.h&gt;</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_sockaddr</function></funcdef>
+        <paramdef>int <parameter>fd</parameter></paramdef>
+        <paramdef>int <parameter>type</parameter></paramdef>
+        <paramdef>const struct sockaddr *<parameter>addr</parameter></paramdef>
+        <paramdef>unsigned <parameter>addr_len</parameter></paramdef>
+        <paramdef>int <parameter>listening</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 (<constant>AF_UNIX</constant>,
+    <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_sockaddr()</function> is similar to
+    <function>sd_is_socket_inet()</function>, but checks if the socket is bound to the
+    address specified by <parameter>addr</parameter>. The
+    <structfield>family</structfield> specified by <parameter>addr</parameter> must be
+    either <constant>AF_INET</constant> or <constant>AF_INET6</constant> and
+    <parameter>addr_len</parameter> must be large enough for that family. If
+    <parameter>addr</parameter> specifies a non-zero port, it is also checked if the
+    socket is bound to this port. In addition, for IPv6, if <parameter>addr</parameter>
+    specifies non-zero <structfield>sin6_flowinfo</structfield> or
+    <structfield>sin6_scope_id</structfield>, it is checked if the socket has the same
+    values.</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 filename. 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 functions use a combination of
+    <citerefentry project='man-pages'><refentrytitle>fstat</refentrytitle><manvolnum>2</manvolnum></citerefentry>
+    and
+    <citerefentry project='man-pages'><refentrytitle>getsockname</refentrytitle><manvolnum>2</manvolnum></citerefentry>
+    to check the file descriptor type and where it is bound to.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>History</title>
+    <para><function>sd_is_special()</function> was added in version 209.</para>
+    <para><function>sd_is_socket_sockaddr()</function> was added in version 233.</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>,
+      <citerefentry project='man-pages'><refentrytitle>ip</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>ipv6</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>unix</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>fifo</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>mq_overview</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>socket</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
+    </para>
+  </refsect1>
+
+</refentry>