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 */ 155