diff --git a/libc/kernel/uapi/linux/sem.h b/libc/kernel/uapi/linux/sem.h
new file mode 100644
index 0000000..88b2f19
--- /dev/null
+++ b/libc/kernel/uapi/linux/sem.h
@@ -0,0 +1,91 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _UAPI_LINUX_SEM_H
+#define _UAPI_LINUX_SEM_H
+#include <linux/ipc.h>
+#define SEM_UNDO 0x1000
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define GETPID 11
+#define GETVAL 12
+#define GETALL 13
+#define GETNCNT 14
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define GETZCNT 15
+#define SETVAL 16
+#define SETALL 17
+#define SEM_STAT 18
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SEM_INFO 19
+struct semid_ds {
+ struct ipc_perm sem_perm;
+ __kernel_time_t sem_otime;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __kernel_time_t sem_ctime;
+ struct sem *sem_base;
+ struct sem_queue *sem_pending;
+ struct sem_queue **sem_pending_last;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ struct sem_undo *undo;
+ unsigned short sem_nsems;
+};
+#include <asm/sembuf.h>
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct sembuf {
+ unsigned short sem_num;
+ short sem_op;
+ short sem_flg;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
+union semun {
+ int val;
+ struct semid_ds __user *buf;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned short __user *array;
+ struct seminfo __user *__buf;
+ void __user *__pad;
+};
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct seminfo {
+ int semmap;
+ int semmni;
+ int semmns;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int semmnu;
+ int semmsl;
+ int semopm;
+ int semume;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ int semusz;
+ int semvmx;
+ int semaem;
+};
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SEMMNI 128
+#define SEMMSL 250
+#define SEMMNS (SEMMNI*SEMMSL)
+#define SEMOPM 32
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SEMVMX 32767
+#define SEMAEM SEMVMX
+#define SEMUME SEMOPM
+#define SEMMNU SEMMNS
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SEMMAP SEMMNS
+#define SEMUSZ 20
+#endif