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 /* Obsolete, used only for backwards compatibility and libc5 compiles */
   9 struct ipc_perm
  10 {
  11         __kernel_key_t  key;
  12         __kernel_uid_t  uid;
  13         __kernel_gid_t  gid;
  14         __kernel_uid_t  cuid;
  15         __kernel_gid_t  cgid;
  16         __kernel_mode_t mode;
  17         unsigned short  seq;
  18 };
  19
  20 /* Include the definition of ipc64_perm */
  21 #include <asm/ipcbuf.h>
  22
  23 /* resource get request flags */
  24 #define IPC_CREAT  00001000   /* create if key is nonexistent */
  25 #define IPC_EXCL   00002000   /* fail if key exists */
  26 #define IPC_NOWAIT 00004000   /* return error on wait */
  27
  28 /* these fields are used by the DIPC package so the kernel as standard
  29    should avoid using them if possible */
  30
  31 #define IPC_DIPC 00010000  /* make it distributed */
  32 #define IPC_OWN  00020000  /* this machine is the DIPC owner */
  33
  34 /*
  35  * Control commands used with semctl, msgctl and shmctl
  36  * see also specific commands in sem.h, msg.h and shm.h
  37  */
  38 #define IPC_RMID 0     /* remove resource */
  39 #define IPC_SET  1     /* set ipc_perm options */
  40 #define IPC_STAT 2     /* get ipc_perm options */
  41 #define IPC_INFO 3     /* see ipcs */
  42
  43 /*
  44  * Version flags for semctl, msgctl, and shmctl commands
  45  * These are passed as bitflags or-ed with the actual command
  46  */
  47 #define IPC_OLD 0       /* Old version (no 32-bit UID support on many
  48                            architectures) */
  49 #define IPC_64  0x0100  /* New version (support 32-bit UIDs, bigger
  50                            message sizes, etc. */
  51
  52 /*
  53  * These are used to wrap system calls.
  54  *
  55  * See architecture code for ugly details..
  56  */
  57 struct ipc_kludge {
  58         struct msgbuf __user *msgp;
  59         long msgtyp;
  60 };
  61
  62 #define SEMOP            1
  63 #define SEMGET           2
  64 #define SEMCTL           3
  65 #define SEMTIMEDOP       4
  66 #define MSGSND          11
  67 #define MSGRCV          12
  68 #define MSGGET          13
  69 #define MSGCTL          14
  70 #define SHMAT           21
  71 #define SHMDT           22
  72 #define SHMGET          23
  73 #define SHMCTL          24
  74
  75 /* Used by the DIPC package, try and avoid reusing it */
  76 #define DIPC            25
  77
  78 #define IPCCALL(version,op)     ((version)<<16 | (op))
  79
  80 #ifdef __KERNEL__
  81
  82 #include <linux/kref.h>
  83 #include <linux/spinlock.h>
  84
  85 #define IPCMNI 32768  /* <= MAX_INT limit for ipc arrays (including sysctl changes) */
  86
  87 /* used by in-kernel data structures */
  88 struct kern_ipc_perm
  89 {
  90         spinlock_t      lock;
  91         int             deleted;
  92         key_t           key;
  93         uid_t           uid;
  94         gid_t           gid;
  95         uid_t           cuid;
  96         gid_t           cgid;
  97         mode_t          mode;
  98         unsigned long   seq;
  99         void            *security;
 100 };
 101
 102 struct ipc_ids;
 103 struct ipc_namespace {
 104         struct kref     kref;
 105         struct ipc_ids  *ids[3];
 106
 107         int             sem_ctls[4];
 108         int             used_sems;
 109
 110         int             msg_ctlmax;
 111         int             msg_ctlmnb;
 112         int             msg_ctlmni;
 113
 114         size_t          shm_ctlmax;
 115         size_t          shm_ctlall;
 116         int             shm_ctlmni;
 117         int             shm_tot;
 118 };
 119
 120 extern struct ipc_namespace init_ipc_ns;
 121
 122 #ifdef CONFIG_SYSVIPC
 123 #define INIT_IPC_NS(ns)         .ns             = &init_ipc_ns,
 124 extern void free_ipc_ns(struct kref *kref);
 125 extern struct ipc_namespace *copy_ipcs(unsigned long flags,
 126                                                 struct ipc_namespace *ns);
 127 #else
 128 #define INIT_IPC_NS(ns)
 129 static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
 130                                                 struct ipc_namespace *ns)
 131 {
 132         return ns;
 133 }
 134 #endif
 135
 136 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
 137 {
 138 #ifdef CONFIG_SYSVIPC
 139         if (ns)
 140                 kref_get(&ns->kref);
 141 #endif
 142         return ns;
 143 }
 144
 145 static inline void put_ipc_ns(struct ipc_namespace *ns)
 146 {
 147 #ifdef CONFIG_SYSVIPC
 148         kref_put(&ns->kref, free_ipc_ns);
 149 #endif
 150 }
 151
 152 #endif /* __KERNEL__ */
 153
 154 #endif /* _LINUX_IPC_H */