--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/cffi/osutil.py	Wed Nov 09 22:08:30 2016 +0000
@@ -0,0 +1,102 @@
+from __future__ import absolute_import
+
+import cffi
+
+ffi = cffi.FFI()
+ffi.set_source("_osutil_cffi", """
+#include <sys/attr.h>
+#include <sys/vnode.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+
+typedef struct val_attrs {
+    uint32_t          length;
+    attribute_set_t   returned;
+    attrreference_t   name_info;
+    fsobj_type_t      obj_type;
+    struct timespec   mtime;
+    uint32_t          accessmask;
+    off_t             datalength;
+} __attribute__((aligned(4), packed)) val_attrs_t;
+""", include_dirs=['mercurial'])
+ffi.cdef('''
+
+typedef uint32_t attrgroup_t;
+
+typedef struct attrlist {
+    uint16_t     bitmapcount; /* number of attr. bit sets in list */
+    uint16_t   reserved;    /* (to maintain 4-byte alignment) */
+    attrgroup_t commonattr;  /* common attribute group */
+    attrgroup_t volattr;     /* volume attribute group */
+    attrgroup_t dirattr;     /* directory attribute group */
+    attrgroup_t fileattr;    /* file attribute group */
+    attrgroup_t forkattr;    /* fork attribute group */
+    ...;
+};
+
+typedef struct attribute_set {
+    ...;
+} attribute_set_t;
+
+typedef struct attrreference {
+    int attr_dataoffset;
+    int attr_length;
+    ...;
+} attrreference_t;
+
+typedef int ... off_t;
+
+typedef struct val_attrs {
+    uint32_t          length;
+    attribute_set_t   returned;
+    attrreference_t   name_info;
+    uint32_t          obj_type;
+    struct timespec   mtime;
+    uint32_t          accessmask;
+    off_t             datalength;
+    ...;
+} val_attrs_t;
+
+/* the exact layout of the above struct will be figured out during build time */
+
+typedef int ... time_t;
+
+typedef struct timespec {
+    time_t tv_sec;
+    ...;
+};
+
+int getattrlist(const char* path, struct attrlist * attrList, void * attrBuf,
+                size_t attrBufSize, unsigned int options);
+
+int getattrlistbulk(int dirfd, struct attrlist * attrList, void * attrBuf,
+                    size_t attrBufSize, uint64_t options);
+
+#define ATTR_BIT_MAP_COUNT ...
+#define ATTR_CMN_NAME ...
+#define ATTR_CMN_OBJTYPE ...
+#define ATTR_CMN_MODTIME ...
+#define ATTR_CMN_ACCESSMASK ...
+#define ATTR_CMN_ERROR ...
+#define ATTR_CMN_RETURNED_ATTRS ...
+#define ATTR_FILE_DATALENGTH ...
+
+#define VREG ...
+#define VDIR ...
+#define VLNK ...
+#define VBLK ...
+#define VCHR ...
+#define VFIFO ...
+#define VSOCK ...
+
+#define S_IFMT ...
+
+int open(const char *path, int oflag, int perm);
+int close(int);
+
+#define O_RDONLY ...
+''')
+
+if __name__ == '__main__':
+    ffi.compile()