Add a "fork" of musl as //fusl.

fusl/include/sys/sem.h

Index: fusl/include/sys/sem.h
diff --git a/fusl/include/sys/sem.h b/fusl/include/sys/sem.h
new file mode 100644
index 0000000000000000000000000000000000000000..e7c369803ade87342532b731b30fba4b8cd026f5
--- /dev/null
+++ b/fusl/include/sys/sem.h
@@ -0,0 +1,67 @@
+#ifndef _SYS_SEM_H
+#define _SYS_SEM_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+
+#define __NEED_size_t
+#define __NEED_pid_t
+#define __NEED_time_t
+#ifdef _GNU_SOURCE
+#define __NEED_struct_timespec
+#endif
+#include <bits/alltypes.h>
+
+#include <sys/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
+
+#include <endian.h>
+
+#include <bits/sem.h>
+
+#define _SEM_SEMUN_UNDEFINED 1
+
+#define SEM_STAT 18
+#define SEM_INFO 19
+
+struct  seminfo {
+	int semmap;
+	int semmni;
+	int semmns;
+	int semmnu;
+	int semmsl;
+	int semopm;
+	int semume;
+	int semusz;
+	int semvmx;
+	int semaem;
+};
+
+struct sembuf {
+	unsigned short sem_num;
+	short sem_op;
+	short sem_flg;
+};
+
+int semctl(int, int, int, ...);
+int semget(key_t, int, int);
+int semop(int, struct sembuf *, size_t);
+
+#ifdef _GNU_SOURCE
+int semtimedop(int, struct sembuf *, size_t, const struct timespec *);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+#endif