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681eb9cf2b
In particular, use /lib/systemd instead of /usr/lib/systemd in distributions like Debian which still have not adopted a /usr merge setup. Use XML entities from man/custom-entities.ent to replace configured paths while doing XSLT processing of the original XML files. There was precedent of some files (such as systemd.generator.xml) which were already using this approach. This addresses most of the (manual) fixes from this patch: http://anonscm.debian.org/cgit/pkg-systemd/systemd.git/tree/debian/patches/Fix-paths-in-man-pages.patch?h=experimental-220 The idea of using generic XML entities was presented here: http://lists.freedesktop.org/archives/systemd-devel/2015-May/032240.html This patch solves almost all the issues, with the exception of: - Path to /bin/mount and /bin/umount. - Generic statements about preference of /lib over /etc. These will be handled separately by follow up patches. Tested: - With default configure settings, ran "make install" to two separate directories and compared the output to confirm they matched exactly. - Used a set of configure flags including $CONFFLAGS from Debian: http://anonscm.debian.org/cgit/pkg-systemd/systemd.git/tree/debian/rules Installed the tree and confirmed the paths use /lib/systemd instead of /usr/lib/systemd and that no other unexpected differences exist. - Confirmed that `make distcheck` still passes.
204 lines
8.1 KiB
XML
204 lines
8.1 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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<!ENTITY % entities SYSTEM "custom-entities.ent" >
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%entities;
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]>
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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 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 (AF_UNIX, <constant>AF_INET</constant>,
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...). If the <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, 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_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 file name. 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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</para>
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</refsect1>
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</refentry>
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