1 files changed, 81 insertions, 0 deletions

diff --git a/ipc/util.h b/ipc/util.h
new file mode 100644
index 000000000000..07d689452363
--- /dev/null
+++ b/ipc/util.h
@@ -0,0 +1,81 @@
+/*
+ * linux/ipc/util.h
+ * Copyright (C) 1999 Christoph Rohland
+ *
+ * ipc helper functions (c) 1999 Manfred Spraul <manfreds@colorfullife.com>
+ */
+
+#ifndef _IPC_UTIL_H
+#define _IPC_UTIL_H
+
+#define USHRT_MAX 0xffff
+#define SEQ_MULTIPLIER  (IPCMNI)
+
+void sem_init (void);
+void msg_init (void);
+void shm_init (void);
+
+struct ipc_id_ary {
+        int size;
+        struct kern_ipc_perm *p[0];
+};
+
+struct ipc_ids {
+        int in_use;
+        int max_id;
+        unsigned short seq;
+        unsigned short seq_max;
+        struct semaphore sem;   
+        struct ipc_id_ary nullentry;
+        struct ipc_id_ary* entries;
+};
+
+void __init ipc_init_ids(struct ipc_ids* ids, int size);
+
+/* must be called with ids->sem acquired.*/
+int ipc_findkey(struct ipc_ids* ids, key_t key);
+int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size);
+
+/* must be called with both locks acquired. */
+struct kern_ipc_perm* ipc_rmid(struct ipc_ids* ids, int id);
+
+int ipcperms (struct kern_ipc_perm *ipcp, short flg);
+
+/* for rare, potentially huge allocations.
+ * both function can sleep
+ */
+void* ipc_alloc(int size);
+void ipc_free(void* ptr, int size);
+
+/*
+ * For allocation that need to be freed by RCU.
+ * Objects are reference counted, they start with reference count 1.
+ * getref increases the refcount, the putref call that reduces the recount
+ * to 0 schedules the rcu destruction. Caller must guarantee locking.
+ */
+void* ipc_rcu_alloc(int size);
+void ipc_rcu_getref(void *ptr);
+void ipc_rcu_putref(void *ptr);
+
+struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id);
+struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
+void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);
+void ipc_unlock(struct kern_ipc_perm* perm);
+int ipc_buildid(struct ipc_ids* ids, int id, int seq);
+int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid);
+
+void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
+void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
+
+#if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__)
+  /* On IA-64, we always use the "64-bit version" of the IPC structures.  */ 
+# define ipc_parse_version(cmd) IPC_64
+#else
+int ipc_parse_version (int *cmd);
+#endif
+
+extern void free_msg(struct msg_msg *msg);
+extern struct msg_msg *load_msg(const void __user *src, int len);
+extern int store_msg(void __user *dest, struct msg_msg *msg, int len);
+
+#endif