LibCore/System: Add mmap, munmap for Windows

Libraries/LibCore/CMakeLists.txt

@@ -22,6 +22,10 @@ serenity_lib(LibCoreMinimal coreminimal)
 if (WIN32)
     find_path(DIRENT_INCLUDE_DIR dirent.h REQUIRED)
     target_include_directories(LibCoreMinimal PRIVATE ${DIRENT_INCLUDE_DIR})
+
+    find_package(mman REQUIRED)
+    target_include_directories(LibCoreMinimal PRIVATE ${MMAN_INCLUDE_DIR})
+    target_link_libraries(LibCoreMinimal PRIVATE ${MMAN_LIBRARY})
 endif()
 
 if (LAGOM_TOOLS_ONLY)

Libraries/LibCore/SystemWindows.cpp

@@ -15,6 +15,7 @@
 #include <Windows.h>
 #include <direct.h>
 #include <io.h>
+#include <sys/mman.h>
 
 namespace Core::System {
 
@@ -166,4 +167,21 @@ ErrorOr<struct stat> fstatat(int, StringView, int)
     VERIFY_NOT_REACHED();
 }
 
+ErrorOr<void*> mmap(void* address, size_t size, int protection, int flags, int fd, off_t offset, size_t alignment, StringView)
+{
+    // custom alignment is not supported
+    VERIFY(!alignment);
+    void* ptr = ::mmap(address, size, protection, flags, fd, offset);
+    if (ptr == MAP_FAILED)
+        return Error::from_syscall("mmap"sv, -errno);
+    return ptr;
+}
+
+ErrorOr<void> munmap(void* address, size_t size)
+{
+    if (::munmap(address, size) < 0)
+        return Error::from_syscall("munmap"sv, -errno);
+    return {};
+}
+
 }

Meta/CMake/Findmman.cmake

@@ -0,0 +1,2 @@
+find_path(MMAN_INCLUDE_DIR sys/mman.h PATH_SUFFIXES mman)
+find_library(MMAN_LIBRARY mman)

vcpkg.json

@@ -71,6 +71,10 @@
         "simd"
       ]
     },
+    {
+      "name": "mman",
+      "platform": "windows"
+    },
     "simdutf",
     {
       "name": "skia",