blob: 833c2642118d5654beef8cce23147246d3937fed [file] [log] [blame]
* linux/ipc/util.h
* Copyright (C) 1999 Christoph Rohland
* ipc helper functions (c) 1999 Manfred Spraul <>
#define USHRT_MAX 0xffff
void sem_init (void);
void msg_init (void);
void shm_init (void);
struct ipc_ids {
int size;
int in_use;
int max_id;
unsigned short seq;
unsigned short seq_max;
struct semaphore sem;
struct ipc_id* entries;
struct ipc_id {
struct kern_ipc_perm* p;
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
* both function can sleep
void* ipc_rcu_alloc(int size);
void ipc_rcu_free(void* arg, int size);
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_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__)
/* On IA-64, we always use the "64-bit version" of the IPC structures. */
# define ipc_parse_version(cmd) IPC_64
int ipc_parse_version (int *cmd);