runtime: add padding to Linux kernel structures

Go exchanges siginfo and sigevent structures with the kernel. They
contain unions, but Go's use is limited to the first few fields. Pad out
the rest so the size Go sees is the same as what the Linux kernel sees.

This is a follow-up to CL 342052 which added the sigevent struct without
padding, and to CL 353136 which added the padding but with an assertion
that confused several type-checkers. It updates the siginfo struct as
well so there are no bad examples in the defs_linux_*.go files.

Reviewed-on: https://go-review.googlesource.com/c/go/+/353136

Change-Id: I9610632ff0ec43eba91f560536f5441fa907b36f
Reviewed-on: https://go-review.googlesource.com/c/go/+/360094
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/runtime/runtime_linux_test.go b/src/runtime/runtime_linux_test.go
index cd59368cb2..a753aeea58 100644
--- a/src/runtime/runtime_linux_test.go
+++ b/src/runtime/runtime_linux_test.go
@@ -61,3 +61,14 @@ func TestEpollctlErrorSign(t *testing.T) {
 		t.Errorf("epollctl = %v, want %v", v, -EBADF)
 	}
 }
+
+func TestKernelStructSize(t *testing.T) {
+	// Check that the Go definitions of structures exchanged with the kernel are
+	// the same size as what the kernel defines.
+	if have, want := unsafe.Sizeof(Siginfo{}), uintptr(SiginfoMaxSize); have != want {
+		t.Errorf("Go's siginfo struct is %d bytes long; kernel expects %d", have, want)
+	}
+	if have, want := unsafe.Sizeof(Sigevent{}), uintptr(SigeventMaxSize); have != want {
+		t.Errorf("Go's sigevent struct is %d bytes long; kernel expects %d", have, want)
+	}
+}