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12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
201 lines
8.1 KiB
XML
201 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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<!--
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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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