Index: lib/libc/net/Makefile.inc
===================================================================
--- lib/libc/net/Makefile.inc
+++ lib/libc/net/Makefile.inc
@@ -66,7 +66,9 @@
 MLINKS+=getifmaddrs.3 freeifmaddrs.3
 MLINKS+=getipnodebyname.3 getipnodebyaddr.3 getipnodebyname.3 freehostent.3
 MLINKS+=getnetent.3 endnetent.3 getnetent.3 getnetbyaddr.3 \
-	getnetent.3 getnetbyname.3 getnetent.3 setnetent.3
+	getnetent.3 getnetbyaddr_r.3 getnetent.3 getnetbyname.3 \
+	getnetent.3 getnetbyname_r.3 getnetent.3 setnetent.3 \
+	getnetent.3 getnetent_r.3
 MLINKS+=getprotoent.3 endprotoent.3 getprotoent.3 getprotobyname.3 \
 	getprotoent.3 getprotobynumber.3 getprotoent.3 setprotoent.3
 MLINKS+=getservent.3 endservent.3 getservent.3 getservbyname.3 \
Index: lib/libc/net/getnetent.3
===================================================================
--- lib/libc/net/getnetent.3
+++ lib/libc/net/getnetent.3
@@ -52,6 +52,12 @@
 .Fn setnetent "int stayopen"
 .Ft void
 .Fn endnetent void
+.Ft int
+.Fn getnetent_r "struct netent *ne" "char *buffer" "size_t buflen" "struct netent **result" "int *h_errnop"
+.Ft int
+.Fn getnetbyaddr_r "uint32_t net" "int type" "struct netent *ne" "char *buffer" "size_t buflen" "struct netent **result" int *h_errorp"
+.Ft int
+.Fn getnetbyname_r "const char *name" "struct netent *ne" "char *buffer" "size_t buflen" "struct netent **result" "int *h_errorp"
 .Sh DESCRIPTION
 The
 .Fn getnetent ,
@@ -135,6 +141,26 @@
 must be
 .Dv AF_INET .
 Network numbers are supplied in host order.
+.Pp
+Functions with the
+.Em _r
+suffix provide reentrant versions of their respective counterparts.
+The caller must supply five additional parameters: a
+.Vt struct netent
+variable to be filled on success, a
+.Va buffer
+of
+.Va buflen
+bytes in size, a
+.Vt struct netent
+.Va result
+variable that will point to the result on success or be set to
+.Dv NULL
+on failure or if the name is not found.
+The
+.Va h_errnop
+variable will be filled with the error code if any.
+All these functions return 0 on success.
 .Sh FILES
 .Bl -tag -width /etc/nsswitch.conf -compact
 .It Pa /etc/networks