From 23573509244d4d5b4dc6d114b5807f72418f3411 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 20 Apr 2011 15:25:28 -0400
Subject: [PATCH] support posix_madvise (previous a stub)

the check against MADV_DONTNEED to because linux MADV_DONTNEED
semantics conflict dangerously with the POSIX semantics
---
 src/mman/posix_madvise.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mman/posix_madvise.c b/src/mman/posix_madvise.c
index 4727ad75..b76f1a75 100644
--- a/src/mman/posix_madvise.c
+++ b/src/mman/posix_madvise.c
@@ -1,6 +1,8 @@
+#define _GNU_SOURCE
 #include <sys/mman.h>
 
 int posix_madvise(void *addr, size_t len, int advice)
 {
-	return 0;
+	if (advice == MADV_DONTNEED) return 0;
+	return -__syscall(SYS_madvise, addr, len, advice);
 }
-- 
2.25.1