include/sys/ipc.h

   1 #ifndef _SYS_IPC_H
   2 #define _SYS_IPC_H
   3
   4 /* For gid_t, uid_t */
   5 #include <sys/types.h>
   6
   7 /* Mode bits for `msgget', `semget', and `shmget'. */
   8 /* Create key if key does not exist. */
   9 #define IPC_CREAT       01000
  10 /* Fail if key exists. */
  11 #define IPC_EXCL        02000
  12 /* Return error on wait. */
  13 #define IPC_NOWAIT      04000
  14
  15 /* Control commands for `msgctl', `semctl', and `shmctl'. */
  16 /* Remove identifier. */
  17 #define IPC_RMID        0
  18 /* Set `ipc_perm' options. */
  19 #define IPC_SET         1
  20 /* Get `ipc_perm' options. */
  21 #define IPC_STAT        2
  22 #define IPC_INFO        3       /* See ipcs. */
  23
  24 /* Special key values. */
  25 /* Private key. */
  26 #define IPC_PRIVATE     ((key_t) 0)
  27
  28 /* Data structure used to pass permission information to IPC operations. */
  29 struct ipc_perm
  30 {
  31         key_t key;      /* Key. */
  32         uid_t uid;              /* Owner's user ID. */
  33         gid_t gid;              /* Owner's group ID. */
  34         uid_t cuid;             /* Creator's user ID. */
  35         gid_t cgid;             /* Creator's group ID. */
  36         unsigned short int mode;        /* Reader/write permission. */
  37         unsigned short int __seq;       /* Sequence number. */
  38 };
  39
  40 _PROTOTYPE( key_t ftok, (const char *__path, int __id));
  41
  42 #endif /* _SYS_IPC_H */