diff --git a/libc/kernel/common/linux/sem.h b/libc/kernel/common/linux/sem.h
new file mode 100644
index 0000000..dfa531b
--- /dev/null
+++ b/libc/kernel/common/linux/sem.h
@@ -0,0 +1,82 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   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.
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _LINUX_SEM_H
+#define _LINUX_SEM_H
+
+#include <linux/ipc.h>
+
+#define SEM_UNDO 0x1000  
+
+#define GETPID 11  
+#define GETVAL 12  
+#define GETALL 13  
+#define GETNCNT 14  
+#define GETZCNT 15  
+#define SETVAL 16  
+#define SETALL 17  
+
+#define SEM_STAT 18
+#define SEM_INFO 19
+
+struct semid_ds {
+ struct ipc_perm sem_perm;
+ __kernel_time_t sem_otime;
+ __kernel_time_t sem_ctime;
+ struct sem *sem_base;
+ struct sem_queue *sem_pending;
+ struct sem_queue **sem_pending_last;
+ struct sem_undo *undo;
+ unsigned short sem_nsems;
+};
+
+#include <asm/sembuf.h>
+
+struct sembuf {
+ unsigned short sem_num;
+ short sem_op;
+ short sem_flg;
+};
+
+union semun {
+ int val;
+ struct semid_ds __user *buf;
+ unsigned short __user *array;
+ struct seminfo __user *__buf;
+ void __user *__pad;
+};
+
+struct seminfo {
+ int semmap;
+ int semmni;
+ int semmns;
+ int semmnu;
+ int semmsl;
+ int semopm;
+ int semume;
+ int semusz;
+ int semvmx;
+ int semaem;
+};
+
+#define SEMMNI 128  
+#define SEMMSL 250  
+#define SEMMNS (SEMMNI*SEMMSL)  
+#define SEMOPM 32  
+#define SEMVMX 32767  
+#define SEMAEM SEMVMX  
+
+#define SEMUME SEMOPM  
+#define SEMMNU SEMMNS  
+#define SEMMAP SEMMNS  
+#define SEMUSZ 20  
+
+#endif