From 19892bf0a740062cf51b84c27f53f7c0f3120b53 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sun, 22 May 2011 12:34:33 -0400
Subject: fix brk/sbrk behavior to match the real legacy functions

---
 src/linux/sbrk.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/linux/sbrk.c')

diff --git a/src/linux/sbrk.c b/src/linux/sbrk.c
index b2943a92..5fab74be 100644
--- a/src/linux/sbrk.c
+++ b/src/linux/sbrk.c
@@ -3,5 +3,7 @@
 
 void *sbrk(ptrdiff_t inc)
 {
-	return (void *)syscall(SYS_brk, syscall(SYS_brk, 0)+inc);
+	unsigned long cur = syscall(SYS_brk, 0);
+	if (inc && syscall(SYS_brk, cur+inc) != cur+inc) return (void *)-1;
+	return (void *)cur;
 }
-- 
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