#ifndef _LINUX_IPC_H #define _LINUX_IPC_H #include <linux/types.h> #define IPC_PRIVATE ((__kernel_key_t) 0) /* Obsolete, used only for backwards compatibility and libc5 compiles */ struct ipc_perm { __kernel_key_t key; __kernel_uid_t uid; __kernel_gid_t gid; __kernel_uid_t cuid; __kernel_gid_t cgid; __kernel_mode_t mode; unsigned short seq; }; /* Include the definition of ipc64_perm */ #include <asm/ipcbuf.h> /* resource get request flags */ #define IPC_CREAT 00001000 /* create if key is nonexistent */ #define IPC_EXCL 00002000 /* fail if key exists */ #define IPC_NOWAIT 00004000 /* return error on wait */ /* these fields are used by the DIPC package so the kernel as standard should avoid using them if possible */ #define IPC_DIPC 00010000 /* make it distributed */ #define IPC_OWN 00020000 /* this machine is the DIPC owner */ /* * Control commands used with semctl, msgctl and shmctl * see also specific commands in sem.h, msg.h and shm.h */ #define IPC_RMID 0 /* remove resource */ #define IPC_SET 1 /* set ipc_perm options */ #define IPC_STAT 2 /* get ipc_perm options */ #define IPC_INFO 3 /* see ipcs */ /* * Version flags for semctl, msgctl, and shmctl commands * These are passed as bitflags or-ed with the actual command */ #define IPC_OLD 0 /* Old version (no 32-bit UID support on many architectures) */ #define IPC_64 0x0100 /* New version (support 32-bit UIDs, bigger message sizes, etc. */ #ifdef __KERNEL__ #include <linux/kref.h> #define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */ /* used by in-kernel data structures */ struct kern_ipc_perm { spinlock_t lock; int deleted; key_t key; uid_t uid; gid_t gid; uid_t cuid; gid_t cgid; mode_t mode; unsigned long seq; void *security; }; struct ipc_ids; struct ipc_namespace { struct kref kref; struct ipc_ids *ids[3]; int sem_ctls[4]; int used_sems; int msg_ctlmax; int msg_ctlmnb; int msg_ctlmni; size_t shm_ctlmax; size_t shm_ctlall; int shm_ctlmni; int shm_tot; }; extern struct ipc_namespace init_ipc_ns; #ifdef CONFIG_SYSVIPC #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, #else #define INIT_IPC_NS(ns) #endif #ifdef CONFIG_IPC_NS extern void free_ipc_ns(struct kref *kref); extern int copy_ipcs(unsigned long flags, struct task_struct *tsk); extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns); #else static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk) { return 0; } #endif static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) { #ifdef CONFIG_IPC_NS if (ns) kref_get(&ns->kref); #endif return ns; } static inline void put_ipc_ns(struct ipc_namespace *ns) { #ifdef CONFIG_IPC_NS kref_put(&ns->kref, free_ipc_ns); #endif } #endif /* __KERNEL__ */ #endif /* _LINUX_IPC_H */