include/linux/ipc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_IPC_H
   3 #define _LINUX_IPC_H
   4
   5 #include <linux/spinlock.h>
   6 #include <linux/uidgid.h>
   7 #include <linux/rhashtable.h>
   8 #include <uapi/linux/ipc.h>
   9 #include <linux/refcount.h>
  10
  11 #define IPCMNI 32768  /* <= MAX_INT limit for ipc arrays (including sysctl changes) */
  12
  13 /* used by in-kernel data structures */
  14 struct kern_ipc_perm {
  15         spinlock_t      lock;
  16         bool            deleted;
  17         int             id;
  18         key_t           key;
  19         kuid_t          uid;
  20         kgid_t          gid;
  21         kuid_t          cuid;
  22         kgid_t          cgid;
  23         umode_t         mode;
  24         unsigned long   seq;
  25         void            *security;
  26
  27         struct rhash_head khtnode;
  28
  29         struct rcu_head rcu;
  30         refcount_t refcount;
  31 } ____cacheline_aligned_in_smp __randomize_layout;
  32
  33 #endif /* _LINUX_IPC_H */