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ipc/util.h
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/* * linux/ipc/util.h * Copyright (C) 1999 Christoph Rohland * |
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* ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com> |
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* namespaces support. 2006 OpenVZ, SWsoft Inc. * Pavel Emelianov <xemul@openvz.org> |
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*/ #ifndef _IPC_UTIL_H #define _IPC_UTIL_H |
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#include <linux/err.h> |
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#define SEQ_MULTIPLIER (IPCMNI) void sem_init (void); void msg_init (void); void shm_init (void); |
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struct ipc_namespace; |
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void sem_init_ns(struct ipc_namespace *ns); void msg_init_ns(struct ipc_namespace *ns); void shm_init_ns(struct ipc_namespace *ns); |
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void sem_exit_ns(struct ipc_namespace *ns); void msg_exit_ns(struct ipc_namespace *ns); void shm_exit_ns(struct ipc_namespace *ns); |
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/* * Structure that holds the parameters needed by the ipc operations * (see after) */ struct ipc_params { key_t key; int flg; union { size_t size; /* for shared memories */ int nsems; /* for semaphores */ } u; /* holds the getnew() specific param */ }; /* * Structure that holds some ipc operations. This structure is used to unify * the calls to sys_msgget(), sys_semget(), sys_shmget() * . routine to call to create a new ipc object. Can be one of newque, * newary, newseg |
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* . routine to call to check permissions for a new ipc object. |
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* Can be one of security_msg_associate, security_sem_associate, * security_shm_associate * . routine to call for an extra check if needed */ struct ipc_ops { int (*getnew) (struct ipc_namespace *, struct ipc_params *); |
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int (*associate) (struct kern_ipc_perm *, int); int (*more_checks) (struct kern_ipc_perm *, struct ipc_params *); |
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}; |
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struct seq_file; |
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struct ipc_ids; |
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void ipc_init_ids(struct ipc_ids *); |
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#ifdef CONFIG_PROC_FS void __init ipc_init_proc_interface(const char *path, const char *header, |
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int ids, int (*show)(struct seq_file *, void *)); |
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#else #define ipc_init_proc_interface(path, header, ids, show) do {} while (0) #endif |
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#define IPC_SEM_IDS 0 #define IPC_MSG_IDS 1 #define IPC_SHM_IDS 2 |
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#define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER) |
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/* must be called with ids->rw_mutex acquired for writing */ |
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int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int); |
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/* must be called with ids->rw_mutex acquired for reading */ |
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int ipc_get_maxid(struct ipc_ids *); |
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/* must be called with both locks acquired. */ |
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void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *); |
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/* must be called with ipcp locked */ int ipcperms(struct kern_ipc_perm *ipcp, short flg); |
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/* 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); |
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/* * ipc_lock_down: called with rw_mutex held * ipc_lock: called without that lock held */ struct kern_ipc_perm *ipc_lock_down(struct ipc_ids *, int); |
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struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int); |
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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); |
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void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out); |
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struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd, struct ipc64_perm *perm, int extra_perm); |
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#if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__) |
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/* 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); |
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extern void recompute_msgmni(struct ipc_namespace *); |
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static inline int ipc_buildid(int id, int seq) |
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{ return SEQ_MULTIPLIER * seq + id; } |
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/* * Must be called with ipcp locked */ |
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static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid) |
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{ if (uid / SEQ_MULTIPLIER != ipcp->seq) return 1; return 0; } static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm) { rcu_read_lock(); spin_lock(&perm->lock); } static inline void ipc_unlock(struct kern_ipc_perm *perm) { spin_unlock(&perm->lock); rcu_read_unlock(); } |
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struct kern_ipc_perm *ipc_lock_check_down(struct ipc_ids *ids, int id); struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id); int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids, struct ipc_ops *ops, struct ipc_params *params); |
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#endif |