From f2aac995e790d240b8ab8bf915e8283e8ba531f0 Mon Sep 17 00:00:00 2001
From: Waldemar Brodkorb <wbrodkorb@conet.de>
Date: Sat, 20 Oct 2018 16:25:49 +0200
Subject: do not expose recvmmsg/sendmmsg for unsupported kernels

---
 libc/inet/socketcalls.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'libc/inet/socketcalls.c')

diff --git a/libc/inet/socketcalls.c b/libc/inet/socketcalls.c
index 1b92609d0..edb5ab87e 100644
--- a/libc/inet/socketcalls.c
+++ b/libc/inet/socketcalls.c
@@ -8,6 +8,7 @@
 #include <sys/syscall.h>
 #include <sys/socket.h>
 #include <cancel.h>
+#include <bits/kernel-features.h>
 
 #ifdef __NR_socketcall
 /* Various socketcall numbers */
@@ -267,6 +268,7 @@ lt_libc_hidden(recvmsg)
 #endif
 
 #ifdef L_recvmmsg
+#ifdef __ASSUME_RECVMMSG_SYSCALL
 static ssize_t __NC(recvmmsg)(int sockfd, struct mmsghdr *msg, size_t vlen,
 			      int flags, struct timespec *tmo)
 {
@@ -289,6 +291,7 @@ CANCELLABLE_SYSCALL(ssize_t, recvmmsg,
 		    (sockfd, msg, vlen, flags, tmo))
 lt_libc_hidden(recvmmsg)
 #endif
+#endif
 
 #ifdef L_send
 static ssize_t __NC(send)(int sockfd, const void *buffer, size_t len, int flags)
@@ -332,6 +335,7 @@ lt_libc_hidden(sendmsg)
 #endif
 
 #ifdef L_sendmmsg
+#ifdef __ASSUME_SENDMMSG_SYSCALL
 static ssize_t __NC(sendmmsg)(int sockfd, struct mmsghdr *msg, size_t vlen,
 			      int flags)
 {
@@ -352,6 +356,7 @@ CANCELLABLE_SYSCALL(ssize_t, sendmmsg,
 		    (sockfd, msg, vlen, flags))
 lt_libc_hidden(sendmmsg)
 #endif
+#endif
 
 #ifdef L_sendto
 ssize_t __NC(sendto)(int sockfd, const void *buffer, size_t len, int flags,
-- 
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