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