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 #ifdef __KERNEL__ 53 54 #include <linux/kref.h> 55 56 #define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */ 57 58 /* used by in-kernel data structures */ 59 struct kern_ipc_perm 60 { 61 spinlock_t lock; 62 int deleted; 63 key_t key; 64 uid_t uid; 65 gid_t gid; 66 uid_t cuid; 67 gid_t cgid; 68 mode_t mode; 69 unsigned long seq; 70 void *security; 71 }; 72 73 struct ipc_ids; 74 struct ipc_namespace { 75 struct kref kref; 76 struct ipc_ids *ids[3]; 77 78 int sem_ctls[4]; 79 int used_sems; 80 81 int msg_ctlmax; 82 int msg_ctlmnb; 83 int msg_ctlmni; 84 85 size_t shm_ctlmax; 86 size_t shm_ctlall; 87 int shm_ctlmni; 88 int shm_tot; 89 }; 90 91 extern struct ipc_namespace init_ipc_ns; 92 93 #ifdef CONFIG_SYSVIPC 94 #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, 95 extern struct ipc_namespace *copy_ipcs(unsigned long flags, 96 struct ipc_namespace *ns); 97 #else 98 #define INIT_IPC_NS(ns) 99 static inline struct ipc_namespace *copy_ipcs(unsigned long flags, 100 struct ipc_namespace *ns) 101 { 102 return ns; 103 } 104 #endif 105 106 #ifdef CONFIG_IPC_NS 107 extern void free_ipc_ns(struct kref *kref); 108 #endif 109 110 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 111 { 112 #ifdef CONFIG_IPC_NS 113 if (ns) 114 kref_get(&ns->kref); 115 #endif 116 return ns; 117 } 118 119 static inline void put_ipc_ns(struct ipc_namespace *ns) 120 { 121 #ifdef CONFIG_IPC_NS 122 kref_put(&ns->kref, free_ipc_ns); 123 #endif 124 } 125 126 #endif /* __KERNEL__ */ 127 128 #endif /* _LINUX_IPC_H */ 129 130 131