1 #ifndef _LINUX_IPC_H 2 #define _LINUX_IPC_H 3 4 #include <linux/types.h> 5 #include <linux/kref.h> 6 7 #define IPC_PRIVATE ((__kernel_key_t) 0) 8 9 /* Obsolete, used only for backwards compatibility and libc5 compiles */ 10 struct ipc_perm 11 { 12 __kernel_key_t key; 13 __kernel_uid_t uid; 14 __kernel_gid_t gid; 15 __kernel_uid_t cuid; 16 __kernel_gid_t cgid; 17 __kernel_mode_t mode; 18 unsigned short seq; 19 }; 20 21 /* Include the definition of ipc64_perm */ 22 #include <asm/ipcbuf.h> 23 24 /* resource get request flags */ 25 #define IPC_CREAT 00001000 /* create if key is nonexistent */ 26 #define IPC_EXCL 00002000 /* fail if key exists */ 27 #define IPC_NOWAIT 00004000 /* return error on wait */ 28 29 /* these fields are used by the DIPC package so the kernel as standard 30 should avoid using them if possible */ 31 32 #define IPC_DIPC 00010000 /* make it distributed */ 33 #define IPC_OWN 00020000 /* this machine is the DIPC owner */ 34 35 /* 36 * Control commands used with semctl, msgctl and shmctl 37 * see also specific commands in sem.h, msg.h and shm.h 38 */ 39 #define IPC_RMID 0 /* remove resource */ 40 #define IPC_SET 1 /* set ipc_perm options */ 41 #define IPC_STAT 2 /* get ipc_perm options */ 42 #define IPC_INFO 3 /* see ipcs */ 43 44 /* 45 * Version flags for semctl, msgctl, and shmctl commands 46 * These are passed as bitflags or-ed with the actual command 47 */ 48 #define IPC_OLD 0 /* Old version (no 32-bit UID support on many 49 architectures) */ 50 #define IPC_64 0x0100 /* New version (support 32-bit UIDs, bigger 51 message sizes, etc. */ 52 53 #ifdef __KERNEL__ 54 55 #define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */ 56 57 /* used by in-kernel data structures */ 58 struct kern_ipc_perm 59 { 60 spinlock_t lock; 61 int deleted; 62 key_t key; 63 uid_t uid; 64 gid_t gid; 65 uid_t cuid; 66 gid_t cgid; 67 mode_t mode; 68 unsigned long seq; 69 void *security; 70 }; 71 72 struct ipc_ids; 73 struct ipc_namespace { 74 struct kref kref; 75 struct ipc_ids *ids[3]; 76 77 int sem_ctls[4]; 78 int used_sems; 79 80 int msg_ctlmax; 81 int msg_ctlmnb; 82 int msg_ctlmni; 83 84 size_t shm_ctlmax; 85 size_t shm_ctlall; 86 int shm_ctlmni; 87 int shm_tot; 88 }; 89 90 extern struct ipc_namespace init_ipc_ns; 91 extern void free_ipc_ns(struct kref *kref); 92 extern int copy_ipcs(unsigned long flags, struct task_struct *tsk); 93 extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns); 94 95 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 96 { 97 if (ns) 98 kref_get(&ns->kref); 99 return ns; 100 } 101 102 static inline void put_ipc_ns(struct ipc_namespace *ns) 103 { 104 kref_put(&ns->kref, free_ipc_ns); 105 } 106 107 #endif /* __KERNEL__ */ 108 109 #endif /* _LINUX_IPC_H */ 110 111 112