include/sys/ipc.h

   1 /*
   2  * SVID compatible ipc.h file
   3  */
   4
   5 #ifndef _SYS_IPC_H_
   6 #define _SYS_IPC_H_
   7
   8 #include <sys/featuretest.h>
   9 #include <sys/types.h>
  10
  11 /* Data structure used to pass permission information to IPC operations. */
  12 struct ipc_perm
  13 {
  14         key_t key;                      /* Key. */
  15         uid_t uid;                      /* Owner's user ID. */
  16         gid_t  gid;                     /* Owner's group ID. */
  17         uid_t cuid;                     /* Creator's user ID. */
  18         gid_t  cgid;                    /* Creator's group ID. */
  19         unsigned short int mode;        /* Reader/write permission. */
  20         unsigned short int __seq;       /* Sequence number. */
  21 };
  22
  23 /* X/Open required constants (same values as system 5) */
  24 #define IPC_CREAT       001000  /* create entry if key does not exist */
  25 #define IPC_EXCL        002000  /* fail if key exists */
  26 #define IPC_NOWAIT      004000  /* error if request must wait */
  27
  28 #define IPC_PRIVATE     (key_t)0 /* private key */
  29
  30 #define IPC_RMID        0       /* remove identifier */
  31 #define IPC_SET         1       /* set options */
  32 #define IPC_STAT        2       /* get options */
  33
  34 #ifdef __minix
  35 #define IPC_INFO        3       /* See ipcs. */
  36 #endif /* !__minix */
  37
  38 /*
  39  * Macro to convert between ipc ids and array indices or sequence ids.
  40  */
  41 #if defined(_NETBSD_SOURCE)
  42 #define IXSEQ_TO_IPCID(ix,perm) (((perm._seq) << 16) | (ix & 0xffff))
  43 #endif
  44
  45 #include <sys/cdefs.h>
  46
  47 __BEGIN_DECLS
  48 key_t   ftok(const char *, int);
  49 __END_DECLS
  50
  51 #endif /* !_SYS_IPC_H_ */