runtime: add test for mincore's return value sign on Linux
Updates #14297
Change-Id: I6b5f5020af5efaaa71280bdeb2ff99785ee9b959
Reviewed-on: https://go-review.googlesource.com/19457
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/src/runtime/runtime_linux_test.go b/src/runtime/runtime_linux_test.go
index 5344ed2..58c797f 100644
--- a/src/runtime/runtime_linux_test.go
+++ b/src/runtime/runtime_linux_test.go
@@ -8,6 +8,7 @@
. "runtime"
"syscall"
"testing"
+ "unsafe"
)
var pid, tid int
@@ -27,3 +28,15 @@
t.Fatalf("pid=%d but tid=%d", pid, tid)
}
}
+
+// Test that error values are negative. Use address 1 (a misaligned
+// pointer) to get -EINVAL.
+func TestMincoreErrorSign(t *testing.T) {
+ var dst byte
+ v := Mincore(unsafe.Pointer(uintptr(1)), 1, &dst)
+
+ const EINVAL = 0x16
+ if v != -EINVAL {
+ t.Errorf("mincore = %v, want %v", v, -EINVAL)
+ }
+}
