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diff --git a/man/sd_is_fifo.xml b/man/sd_is_fifo.xml new file mode 100644 index 0000000..a00a2cc --- /dev/null +++ b/man/sd_is_fifo.xml @@ -0,0 +1,208 @@ +<?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 <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_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> |