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 int id; 93 key_t key; 94 uid_t uid; 95 gid_t gid; 96 uid_t cuid; 97 gid_t cgid; 98 mode_t mode; 99 unsigned long seq; 100 void *security; 101 }; 102 103 struct ipc_ids; 104 struct ipc_namespace { 105 struct kref kref; 106 struct ipc_ids *ids[3]; 107 108 int sem_ctls[4]; 109 int used_sems; 110 111 int msg_ctlmax; 112 int msg_ctlmnb; 113 int msg_ctlmni; 114 atomic_t msg_bytes; 115 atomic_t msg_hdrs; 116 117 size_t shm_ctlmax; 118 size_t shm_ctlall; 119 int shm_ctlmni; 120 int shm_tot; 121 }; 122 123 extern struct ipc_namespace init_ipc_ns; 124 125 #ifdef CONFIG_SYSVIPC 126 #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, 127 extern void free_ipc_ns(struct kref *kref); 128 extern struct ipc_namespace *copy_ipcs(unsigned long flags, 129 struct ipc_namespace *ns); 130 #else 131 #define INIT_IPC_NS(ns) 132 static inline struct ipc_namespace *copy_ipcs(unsigned long flags, 133 struct ipc_namespace *ns) 134 { 135 return ns; 136 } 137 #endif 138 139 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 140 { 141 #ifdef CONFIG_SYSVIPC 142 if (ns) 143 kref_get(&ns->kref); 144 #endif 145 return ns; 146 } 147 148 static inline void put_ipc_ns(struct ipc_namespace *ns) 149 { 150 #ifdef CONFIG_SYSVIPC 151 kref_put(&ns->kref, free_ipc_ns); 152 #endif 153 } 154 155 #endif /* __KERNEL__ */ 156 157 #endif /* _LINUX_IPC_H */ 158