Support Posix ACL APIs on MS-Windows.

 src/w32.c: Include sddl.h and sys/acl.h.
 (SDDL_REVISION_1): Define if not already defined.
 (g_b_init_get_security_descriptor_dacl)
 (g_b_init_convert_sd_to_sddl, g_b_init_convert_sddl_to_sd)
 (g_b_init_is_valid_security_descriptor)
 (g_b_init_set_file_security): New static flags.
 (globals_of_w32): Initialize them to zero.
 (SetFileSecurity_Name): New string constant.
 (SetFileSecurity_Proc, GetSecurityDescriptorDacl_Proc)
 (ConvertStringSecurityDescriptorToSecurityDescriptor_Proc)
 (ConvertSecurityDescriptorToStringSecurityDescriptor_Proc)
 (IsValidSecurityDescriptor_Proc): New typedefs.
 (get_file_security, get_security_descriptor_owner)
 (get_security_descriptor_group): Set errno to ENOTSUP.
 (set_file_security, get_security_descriptor_dacl)
 (is_valid_security_descriptor, convert_sd_to_sddl)
 (convert_sddl_to_sd, acl_valid, acl_to_text, acl_from_text)
 (acl_free, acl_get_file, acl_set_file): New functions.
 src/fileio.c (Fcopy_file) [WINDOWSNT]: Support copying ACLs.

 nt/inc/sys/acl.h: New file.
 nt/inc/ms-w32.h (ENOTSUP): Define if undefined.
 nt/config.nt (HAVE_POSIX_ACL): Define.

 doc/lispref/files.texi (File Attributes, Changing Files): Update to include
 MS-Windows support for ACLs.

1 files changed, 3 insertions, 2 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 1c82b760946..263ca3cd48a 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -44,8 +44,9 @@ simply disabling Transient Mark mode does the same thing.
 *** Emacs preserves the ACL entries of files when backing up.
 +++
 *** New functions `file-acl' and `set-file-acl' get and set the ACL
-entries of a file.  On GNU/Linux the POSIX ACL interface is used via
-libacl.
+entries of a file.  On GNU/Linux, the POSIX ACL interface is used via
+libacl.  On MS-Windows, the NT Security APIs are used to emulate the
+POSIX ACL interfaces.
 
 * Editing Changes in Emacs 24.4