<structname>e->name</structname> to an errno-like value using the
same rules as <function>sd_bus_error_set</function>. If
<parameter>e</parameter> is <constant>NULL</constant>, 0 will be
<structname>e->name</structname> to an errno-like value using the
same rules as <function>sd_bus_error_set</function>. If
<parameter>e</parameter> is <constant>NULL</constant>, 0 will be