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-rw-r--r--sysdeps/mach/hurd/ftok.c43
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diff --git a/sysdeps/mach/hurd/ftok.c b/sysdeps/mach/hurd/ftok.c
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+++ b/sysdeps/mach/hurd/ftok.c
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+/* SysV ftok for Hurd.
+ Copyright (C) 1995-2015 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sys/ipc.h>
+#include <sys/stat.h>
+
+
+/* In the Hurd, we use the second-to-most-significant bit as flag for
+ private keys. We use an order of the components different from the generic
+ code in sysvipc/ftok.c so that the biggest one--the inode number--is
+ affected by this. */
+
+key_t
+ftok (pathname, proj_id)
+ const char *pathname;
+ int proj_id;
+{
+ struct stat64 st;
+ key_t key;
+
+ if (__xstat64 (_STAT_VER, pathname, &st) < 0)
+ return (key_t) -1;
+
+ key = ((st.st_dev & 0xff) | ((proj_id & 0xff) << 8)
+ | ((st.st_ino & 0x3fff) << 16));
+
+ return key;
+}