- <function>return</function> statement.</para>
-
- <para>If <parameter>e</parameter> is not
- <constant>NULL</constant>, <structfield>name</structfield> and
- <structfield>message</structfield> in the
- <structname>sd_bus_error</structname> structure
- <parameter>e</parameter> points at will be filled in. As described above,
- <parameter>name</parameter> may be <constant>NULL</constant>,
- which is treated as no error. Parameter
- <parameter>message</parameter> may also be
- <constant>NULL</constant>, in which case no message is specified.
- <function>sd_bus_error_set</function> will make internal copies of
- specified strings.</para>
-
- <para><function>sd_bus_error_setf</function> is similar to
- <function>sd_bus_error_set</function>, but takes a
- <citerefentry project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- format string and corresponding arguments to generate
- <structname>message</structname>.</para>
-
- <para><function>sd_bus_error_set_const</function> is similar to
- <function>sd_bus_error_set</function>, but string parameters are
- not copied internally, and must remain valid for the lifetime of
- <parameter>e</parameter>.</para>
-
- <para><function>sd_bus_error_set_errno</function> will set
- <structfield>name</structfield> based on an errno-like value.
- <citerefentry><refentrytitle>strerror</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ <function>return</function> statement. If
+ <parameter>message</parameter> is NULL, no message is set. This
+ call can fail if no memory may be allocated for the name and
+ message strings, in which case an
+ <constant>SD_BUS_ERROR_NO_MEMORY</constant> error might be set
+ instead and -ENOMEM be returned. Do not use this call on error
+ structures that are already initialized. If you intend to reuse an
+ error structure, free the old data stored in it with
+ <function>sd_bus_error_free()</function> first.</para>
+
+ <para><function>sd_bus_error_setf()</function> is similar to
+ <function>sd_bus_error_set()</function>, but takes a <citerefentry
+ project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ format string and corresponding arguments to generate the
+ <structfield>message</structfield> field.</para>
+
+ <para><function>sd_bus_error_set_const()</function> is similar to
+ <function>sd_bus_error_set()</function>, but the string parameters
+ are not copied internally, and must hence remain constant and
+ valid for the lifetime of <parameter>e</parameter>. Use this call
+ to avoid memory allocations when setting error structures. Since
+ this call does not allocate memory, it will not fail with an
+ out-of-memory condition as
+ <function>sd_bus_error_set()</function> can, as described
+ above. Alternatively, the
+ <constant>SD_BUS_ERROR_MAKE_CONST()</constant> macro may be used
+ to generate a literal, constant bus error structure
+ on-the-fly.</para>
+
+ <para><function>sd_bus_error_set_errno()</function> will set
+ <structfield>name</structfield> from an
+ <varname>errno</varname>-like value that is converted to a D-Bus
+ error. <citerefentry
+ project='die-net'><refentrytitle>strerror_r</refentrytitle><manvolnum>3</manvolnum></citerefentry>