Port: Add mman.h compat for mingw

[babeltrace.git] / include / babeltrace / mmap-align-internal.h

diff --git a/include/babeltrace/mmap-align-internal.h b/include/babeltrace/mmap-align-internal.h
index 0667ab0c8933ad7a8db91c659fd0977c3294ae9e..e87f4a98efc297110700314914654aa3568d128f 100644 (file)
--- a/include/babeltrace/mmap-align-internal.h
+++ b/include/babeltrace/mmap-align-internal.h
@@ -28,7 +28,7 @@
 #include <babeltrace/align-internal.h>
 #include <stdlib.h>
 #include <stdint.h>
-#include <sys/mman.h>
+#include <babeltrace/compat/mman-internal.h>
 #include <babeltrace/common-internal.h>
 
 /*
@@ -48,6 +48,30 @@ struct mmap_align {
        size_t length;                  /* virtual mmap length */
 };
 
+#ifdef __WIN32__
+#include <windows.h>
+
+/*
+ * On windows the memory mapping offset must be aligned to the memory
+ * allocator allocation granularity and not the page size.
+ */
+static inline
+off_t get_page_aligned_offset(off_t offset, size_t page_size)
+{
+       SYSTEM_INFO sysinfo;
+
+       GetNativeSystemInfo(&sysinfo);
+
+       return ALIGN_FLOOR(offset, sysinfo.dwAllocationGranularity);
+}
+#else
+static inline
+off_t get_page_aligned_offset(off_t offset, size_t page_size)
+{
+       return ALIGN_FLOOR(offset, page_size);
+}
+#endif
+
 static inline
 struct mmap_align *mmap_align(size_t length, int prot,
                int flags, int fd, off_t offset)
@@ -62,7 +86,7 @@ struct mmap_align *mmap_align(size_t length, int prot,
        if (!mma)
                return MAP_FAILED;
        mma->length = length;
-       page_aligned_offset = ALIGN_FLOOR(offset, page_size);
+       page_aligned_offset = get_page_aligned_offset(offset, page_size);
        /*
         * Page aligned length needs to contain the requested range.
         * E.g., for a small range that fits within a single page, we might
@@ -72,7 +96,7 @@ struct mmap_align *mmap_align(size_t length, int prot,
        mma->page_aligned_length = ALIGN(length + offset - page_aligned_offset, page_size);
        mma->page_aligned_addr = mmap(NULL, mma->page_aligned_length,
                prot, flags, fd, page_aligned_offset);
-       if (mma->page_aligned_addr == (void *) -1UL) {
+       if (mma->page_aligned_addr == MAP_FAILED) {
                free(mma);
                return MAP_FAILED;
        }