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man: clarify sd_bus_e_get_errno with NULL arg
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@ -297,9 +297,10 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
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<parameter>format</parameter> and the arguments.</para>
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<para><function>sd_bus_error_get_errno</function> is will convert
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<structname>e->name</structname> to an errno-like value
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using the same rules as <function>sd_bus_error_set</function>.
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</para>
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<structname>e->name</structname> to an errno-like value using the
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same rules as <function>sd_bus_error_set</function>. If
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<parameter>e</parameter> is <constant>NULL</constant>, 0 will be
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returned.</para>
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<para><function>sd_bus_error_copy</function> will initialize
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<parameter>dst</parameter> using the values in
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