From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- ipc/util.h | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 ipc/util.h (limited to 'ipc/util.h') 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 + */ + +#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 -- cgit v1.2.3-59-g8ed1b