root/include/linux/ipc.h

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INCLUDED FROM

#ifndef _LINUX_IPC_H
#define _LINUX_IPC_H

#include <linux/spinlock.h>
#include <linux/uidgid.h>
#include <uapi/linux/ipc.h>

#define IPCMNI 32768  /* <= MAX_INT limit for ipc arrays (including sysctl changes) */

/* used by in-kernel data structures */
struct kern_ipc_perm
{
        spinlock_t      lock;
        bool            deleted;
        int             id;
        key_t           key;
        kuid_t          uid;
        kgid_t          gid;
        kuid_t          cuid;
        kgid_t          cgid;
        umode_t         mode; 
        unsigned long   seq;
        void            *security;
};

#endif /* _LINUX_IPC_H */
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