1 files changed, 91 insertions, 0 deletions
diff --git a/kit/shared_memory.win32.c b/kit/shared_memory.win32.c
new file mode 100644
index 0000000..f1d24d0
--- /dev/null
+++ b/kit/shared_memory.win32.c
@@ -0,0 +1,91 @@
+#include "shared_memory.h"
+
+#if defined(_WIN32) && !defined(__CYGWIN__)
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN
+#  endif
+#  ifndef NOMINMAX
+#    define NOMINMAX
+#  endif
+#  include <windows.h>
+
+kit_shared_memory_t kit_shared_memory_open(kit_str_t name, i64 size,
+                                           i32 mode) {
+  kit_shared_memory_t mem;
+  memset(&mem, 0, sizeof mem);
+
+  char buf[264] = "Global\\";
+
+  assert(size > 0);
+  assert(name.size > 0);
+  assert(name.size + 8 < (i64) sizeof buf);
+  assert(name.values != NULL);
+
+  if (name.size <= 0) {
+    mem.status = KIT_ERROR_INVALID_NAME;
+    return mem;
+  }
+
+  if (name.size + 8 >= (i64) sizeof buf) {
+    mem.status = KIT_ERROR_NAME_TOO_LONG;
+    return mem;
+  }
+
+  for (i64 i = 0; i < name.size; i++)
+    if (name.values[i] == '/' || name.values[i] == '\\') {
+      mem.status = KIT_ERROR_INVALID_NAME;
+      return mem;
+    }
+
+  memcpy(buf + 7, name.values, name.size);
+  buf[7 + name.size] = '\0';
+
+  HANDLE h = mode == KIT_SHARED_MEMORY_CREATE
+                 ? CreateFileMappingA(
+                       INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
+                       (DWORD) (size >> 32), (DWORD) size, buf)
+                 : OpenFileMappingA(FILE_MAP_ALL_ACCESS, 0, buf);
+
+  if (h == INVALID_HANDLE_VALUE) {
+    mem.status = KIT_ERROR_OPEN_FAILED;
+    return mem;
+  }
+
+  void *p = MapViewOfFile(h, FILE_MAP_ALL_ACCESS, 0, 0,
+                          (SIZE_T) size);
+
+  if (p == NULL) {
+    CloseHandle(h);
+    mem.status = KIT_ERROR_MAP_FAILED;
+    return mem;
+  }
+
+  mem.status  = KIT_OK;
+  mem.size    = size;
+  mem.bytes   = (u8 *) p;
+  mem._handle = h;
+  return mem;
+}
+
+s32 kit_shared_memory_close(kit_shared_memory_t *mem) {
+  assert(mem != NULL);
+
+  i32 status = KIT_OK;
+
+  if (!UnmapViewOfFile(mem->bytes))
+    status |= KIT_ERROR_UNMAP_FAILED;
+  if (!CloseHandle(mem->_handle))
+    status |= KIT_ERROR_UNLINK_FAILED;
+
+  return status;
+}
+
+s32 kit_shared_memory_clean(kit_str_t name) {
+  //  Do nothing.
+  //
+
+  (void) name;
+
+  return KIT_OK;
+}
+#endif