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-rw-r--r--user/usertests.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/user/usertests.c b/user/usertests.c
index f83a060..aefbc9f 100644
--- a/user/usertests.c
+++ b/user/usertests.c
@@ -2251,9 +2251,12 @@ countfree()
int n = 0;
while(1){
- if((uint64)sbrk(4096) == 0xffffffffffffffff){
+ uint64 a = (uint64) sbrk(4096);
+ if(a == 0xffffffffffffffff){
break;
}
+ // modify the memory to make sure it's really allocated.
+ *(char *)(a - 1) = 1;
n += 1;
}
sbrk(-((uint64)sbrk(0) - sz0));