1 files changed, 76 insertions, 0 deletions
diff --git a/src/util/unix/map.c b/src/util/unix/map.c
new file mode 100644
index 000000000..933077689
--- /dev/null
+++ b/src/util/unix/map.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "git2_util.h"
+
+#if !defined(GIT_WIN32) && !defined(NO_MMAP)
+
+#include "map.h"
+#include <sys/mman.h>
+#include <unistd.h>
+#include <errno.h>
+
+int git__page_size(size_t *page_size)
+{
+	long sc_page_size = sysconf(_SC_PAGE_SIZE);
+	if (sc_page_size < 0) {
+		git_error_set(GIT_ERROR_OS, "can't determine system page size");
+		return -1;
+	}
+	*page_size = (size_t) sc_page_size;
+	return 0;
+}
+
+int git__mmap_alignment(size_t *alignment)
+{
+  return git__page_size(alignment);
+}
+
+int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, off64_t offset)
+{
+	int mprot = PROT_READ;
+	int mflag = 0;
+
+	GIT_MMAP_VALIDATE(out, len, prot, flags);
+
+	out->data = NULL;
+	out->len = 0;
+
+	if (prot & GIT_PROT_WRITE)
+		mprot |= PROT_WRITE;
+
+	if ((flags & GIT_MAP_TYPE) == GIT_MAP_SHARED)
+		mflag = MAP_SHARED;
+	else if ((flags & GIT_MAP_TYPE) == GIT_MAP_PRIVATE)
+		mflag = MAP_PRIVATE;
+	else
+		mflag = MAP_SHARED;
+
+	out->data = mmap(NULL, len, mprot, mflag, fd, offset);
+
+	if (!out->data || out->data == MAP_FAILED) {
+		git_error_set(GIT_ERROR_OS, "failed to mmap. Could not write data");
+		return -1;
+	}
+
+	out->len = len;
+
+	return 0;
+}
+
+int p_munmap(git_map *map)
+{
+	GIT_ASSERT_ARG(map);
+	munmap(map->data, map->len);
+	map->data = NULL;
+	map->len = 0;
+
+	return 0;
+}
+
+#endif
+