resolver.3: Add documentation of res_nclose()

I found the neccessary information in the glibc sources.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man3/resolver.3 b/man3/resolver.3
index ed63929760fcdf8313b637b56cb32fb9eab21fa2..3cd659d3329ae5c8e8f45c7ae39770aeb5a994f8 100644 (file)
--- a/man3/resolver.3
+++ b/man3/resolver.3
@@ -32,7 +32,7 @@
 .\"
 .TH RESOLVER 3 2017-09-15 "GNU" "Linux Programmer's Manual"
 .SH NAME
-res_ninit, res_nquery, res_nsearch, res_nquerydomain, res_nmkquery, res_nsend,
+res_ninit, res_nclose, res_nquery, res_nsearch, res_nquerydomain, res_nmkquery, res_nsend,
 res_init, res_query, res_search, res_querydomain, res_mkquery, res_send,
 dn_comp, dn_expand \- resolver routines
 .SH SYNOPSIS
@@ -46,6 +46,8 @@ dn_comp, dn_expand \- resolver routines
 .PP
 .BI "int res_ninit(res_state " statep );
 .PP
+.BI "void res_nclose(res_state " statep );
+.PP
 .BI "int res_nquery(res_state " statep ,
 .BI "           const char *" dname ", int " class ", int " type ,
 .BI "           unsigned char *" answer ", int " anslen );
@@ -146,6 +148,14 @@ or
 .BR res_init ()
 is normally executed by the first call to one of the
 other functions.
+Every call to
+.BR res_ninit ()
+requires a corresponding call to
+.BR res_nclose ()
+to free memory allocated by
+.BR res_ninit ()
+and subsequent calls to
+.BR res_nquery ().
 .PP
 The
 .BR res_nquery ()
@@ -468,6 +478,7 @@ l l l.
 Interface      Attribute       Value
 T{
 .BR res_ninit (),
+.BR res_nclose (),
 .BR res_nquery (),
 .br
 .BR res_nsearch (),