diff --git a/libc/include/sys/personality.h b/libc/include/sys/personality.h
new file mode 100644
index 0000000..2199fa7
--- /dev/null
+++ b/libc/include/sys/personality.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _SYS_PERSONALITY_H_
+#define _SYS_PERSONALITY_H_
+
+__BEGIN_DECLS
+
+/* constants taken from linux-3.0.4/include/linux/personality.h */
+
+enum {
+        UNAME26 =               0x0020000,
+        ADDR_NO_RANDOMIZE =     0x0040000,
+        FDPIC_FUNCPTRS =        0x0080000,
+        MMAP_PAGE_ZERO =        0x0100000,
+        ADDR_COMPAT_LAYOUT =    0x0200000,
+        READ_IMPLIES_EXEC =     0x0400000,
+        ADDR_LIMIT_32BIT =      0x0800000,
+        SHORT_INODE =           0x1000000,
+        WHOLE_SECONDS =         0x2000000,
+        STICKY_TIMEOUTS =       0x4000000,
+        ADDR_LIMIT_3GB =        0x8000000,
+};
+
+#define PER_CLEAR_ON_SETID (READ_IMPLIES_EXEC  | \
+                            ADDR_NO_RANDOMIZE  | \
+                            ADDR_COMPAT_LAYOUT | \
+                            MMAP_PAGE_ZERO)
+
+enum {
+        PER_LINUX =             0x0000,
+        PER_LINUX_32BIT =       0x0000 | ADDR_LIMIT_32BIT,
+        PER_LINUX_FDPIC =       0x0000 | FDPIC_FUNCPTRS,
+        PER_SVR4 =              0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
+        PER_SVR3 =              0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
+        PER_SCOSVR3 =           0x0003 | STICKY_TIMEOUTS |
+                                         WHOLE_SECONDS | SHORT_INODE,
+        PER_OSR5 =              0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
+        PER_WYSEV386 =          0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
+        PER_ISCR4 =             0x0005 | STICKY_TIMEOUTS,
+        PER_BSD =               0x0006,
+        PER_SUNOS =             0x0006 | STICKY_TIMEOUTS,
+        PER_XENIX =             0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
+        PER_LINUX32 =           0x0008,
+        PER_LINUX32_3GB =       0x0008 | ADDR_LIMIT_3GB,
+        PER_IRIX32 =            0x0009 | STICKY_TIMEOUTS,
+        PER_IRIXN32 =           0x000a | STICKY_TIMEOUTS,
+        PER_IRIX64 =            0x000b | STICKY_TIMEOUTS,
+        PER_RISCOS =            0x000c,
+        PER_SOLARIS =           0x000d | STICKY_TIMEOUTS,
+        PER_UW7 =               0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
+        PER_OSF4 =              0x000f,
+        PER_HPUX =              0x0010,
+        PER_MASK =              0x00ff,
+};
+
+extern int personality (unsigned long persona);
+
+__END_DECLS
+
+#endif /* _SYS_PERSONALITY_H_ */