include/linux/ipc.h

   1 #ifndef _LINUX_IPC_H
   2 #define _LINUX_IPC_H
   3
   4 #include <linux/types.h>
   5
   6 #define IPC_PRIVATE ((__kernel_key_t) 0)
   7
   8 struct ipc_perm
   9 {
  10         __kernel_key_t  key;
  11         __kernel_uid_t  uid;
  12         __kernel_gid_t  gid;
  13         __kernel_uid_t  cuid;
  14         __kernel_gid_t  cgid;
  15         __kernel_mode_t mode;
  16         unsigned short  seq;
  17 };
  18
  19 /* resource get request flags */
  20 #define IPC_CREAT  00001000   /* create if key is nonexistent */
  21 #define IPC_EXCL   00002000   /* fail if key exists */
  22 #define IPC_NOWAIT 00004000   /* return error on wait */
  23
  24 /* these fields are used by the DIPC package so the kernel as standard
  25    should avoid using them if possible */
  26
  27 #define IPC_DIPC 00010000  /* make it distributed */
  28 #define IPC_OWN  00020000  /* this machine is the DIPC owner */
  29
  30 /*
  31  * Control commands used with semctl, msgctl and shmctl
  32  * see also specific commands in sem.h, msg.h and shm.h
  33  */
  34 #define IPC_RMID 0     /* remove resource */
  35 #define IPC_SET  1     /* set ipc_perm options */
  36 #define IPC_STAT 2     /* get ipc_perm options */
  37 #define IPC_INFO 3     /* see ipcs */
  38
  39 #ifdef __KERNEL__
  40
  41 /* special shmsegs[id], msgque[id] or semary[id]  values */
  42 #define IPC_UNUSED      ((void *) -1)
  43 #define IPC_NOID        ((void *) -2)           /* being allocated/destroyed */
  44
  45 #endif /* __KERNEL__ */
  46
  47 #endif /* _LINUX_IPC_H */
  48
  49