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/*

 * linux/ipc/util.h

 * Copyright (C) 1999 Christoph Rohland

 *

 * ipc helper functions (c) 1999 Manfred Spraul <manfreds@colorfullife.com>

 */

#define USHRT_MAX 0xffff

#define SEQ_MULTIPLIER  (IPCMNI)

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;

        spinlock_t ary;

        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);

extern inline void ipc_lockall(struct ipc_ids* ids)

{

        spin_lock(&ids->ary);

}

extern inline struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id)

{

        struct kern_ipc_perm* out;

        int lid = id % SEQ_MULTIPLIER;

        if(lid >= ids->size)

                return NULL;

        out = ids->entries[lid].p;

        return out;

}

extern inline void ipc_unlockall(struct ipc_ids* ids)

{

        spin_unlock(&ids->ary);

}

extern inline struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id)

{

        struct kern_ipc_perm* out;

        int lid = id % SEQ_MULTIPLIER;

        if(lid >= ids->size)

                return NULL;

        spin_lock(&ids->ary);

        out = ids->entries[lid].p;

        if(out==NULL)

                spin_unlock(&ids->ary);

        return out;

}

extern inline void ipc_unlock(struct ipc_ids* ids, int id)

{

        spin_unlock(&ids->ary);

}

extern inline int ipc_buildid(struct ipc_ids* ids, int id, int seq)

{

        return SEQ_MULTIPLIER*seq + id;

}

extern inline int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid)

{

        if(uid/SEQ_MULTIPLIER != ipcp->seq)

                return 1;

        return 0;

}

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(__hppa__)

  /* On IA-64 and PA-RISC, 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