fd: mmap: Don't use null span
We aren't allowed to use a null span with positive size, change the
internal interfaces to avoid it.
Change-Id: I6687d45a535c20b72f42a99e1ecdbd89f3796f99
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/src/fd/mmap.cpp b/src/fd/mmap.cpp
index 7026aa6..4718121 100644
--- a/src/fd/mmap.cpp
+++ b/src/fd/mmap.cpp
@@ -6,8 +6,13 @@
namespace fd
{
+MMap::MMap(Fd& fd, size_t window_size, ProtFlags prot, MMapFlags flags,
+ off_t offset) :
+ mapping(fd.mmap(nullptr, window_size, prot, flags, offset), fd)
+{}
MMap::MMap(Fd& fd, std::span<std::byte> window, ProtFlags prot, MMapFlags flags,
- off_t offset) : mapping(fd.mmap(window, prot, flags, offset), fd)
+ off_t offset) :
+ mapping(fd.mmap(window.data(), window.size(), prot, flags, offset), fd)
{}
std::span<std::byte> MMap::get() const