<refname>sd_is_socket_inet</refname>
<refname>sd_is_socket_unix</refname>
<refname>sd_is_mq</refname>
+ <refname>sd_is_special</refname>
<refpurpose>Check the type of a file descriptor</refpurpose>
</refnamediv>
<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>
<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 NULL, it is checked whether the FIFO
- is bound to the specified file system path.</para>
+ 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
<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 NULL, it
- is checked whether the message queue is bound to the
- specified name.</para>
+ <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 file
+ descriptor is bound to the specified file
+ name. Special files in this context are character
+ device nodes and files in <filename>/proc</filename>
+ or <filename>/sys</filename>.</para>
</refsect1>
<refsect1>
<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
+ the specified type and bound to the specified address,
a positive return value is returned, otherwise
zero.</para>
</refsect1>