Include/linux/shm.h
17035 #ifndef _LINUX_SHM_H_ 17036 #define _LINUX_SHM_H_ 17037 17038 #include <linux/ipc.h> 17039 17040 #include <asm/shmparam.h> 17041
17042 struct shmid_ds { 17043 struct ipc_perm shm_perm; /* operation perms */ 17044 int shm_segsz; /* seg sz (bytes) */ 17045 __kernel_time_t shm_atime; /* last attach time */ 17046 __kernel_time_t shm_dtime; /* last detach time */ 17047 __kernel_time_t shm_ctime; /* last change time */ 17048 __kernel_ipc_pid_t shm_cpid; /* pid of creator */ 17049 __kernel_ipc_pid_t shm_lpid; /* pid of last op */ 17050 unsigned short shm_nattch; /* #current attaches*/ 17051 unsigned short shm_unused; /* compatibility */ 17052 void *shm_unused2; /* ditto - for DIPC */ 17053 void *shm_unused3; /* unused */ 17054 }; 17055
17056 struct shmid_kernel 17057 { 17058 struct shmid_ds u; 17059 /* the following are private */ 17060 unsigned long shm_npages; /* seg sz (pages) */ 17061 /* array of ptrs to frames -> SHMMAX */ 17062 unsigned long *shm_pages; 17063 /* descriptors for attaches */ 17064 struct vm_area_struct *attaches; 17065 }; 17066 17067 /* permission flag for shmget */ 17068 #define SHM_R 0400 /*or S_IRUGO from linux/stat.h*/ 17069 #define SHM_W 0200 /*or S_IWUGO from linux/stat.h*/ 17070 17071 /* mode for attach */ 17072 #define SHM_RDONLY 010000 /* read-only access */ 17073 #define SHM_RND 020000 /* round attach addr to 17074 SHMLBA boundary */ 17075 #define SHM_REMAP 040000 /*take over region on attach*/ 17076 17077 /* super user shmctl commands */ 17078 #define SHM_LOCK 11 17079 #define SHM_UNLOCK 12 17080 17081 /* ipcs ctl commands */ 17082 #define SHM_STAT 13 17083 #define SHM_INFO 14 17084 17085 struct shminfo { 17086 int shmmax; 17087 int shmmin; 17088 int shmmni; 17089 int shmseg; 17090 int shmall; 17091 }; 17092 17093 struct shm_info { 17094 int used_ids; 17095 unsigned long shm_tot; /* total allocated shm */ 17096 unsigned long shm_rss; /* total resident shm */ 17097 unsigned long shm_swp; /* total swapped shm */ 17098 unsigned long swap_attempts; 17099 unsigned long swap_successes; 17100 }; 17101 17102 #ifdef __KERNEL__ 17103 17104 /* shm_mode upper byte flags */ 17105 /* segment will be destroyed on last detach */ 17106 #define SHM_DEST 01000 17107 /* segment will not be swapped */ 17108 #define SHM_LOCKED 02000 17109 17110 asmlinkage int sys_shmget(key_t key, int size, 17111 int flag); 17112 asmlinkage int sys_shmat(int shmid, char *shmaddr, 17113 int shmflg,unsigned long *addr); 17114 asmlinkage int sys_shmdt (char *shmaddr); 17115 asmlinkage int sys_shmctl (int shmid, int cmd, 17116 struct shmid_ds *buf); 17117 extern void shm_unuse(unsigned long entry, 17118 unsigned long page); 17119 17120 #endif /* __KERNEL__ */ 17121 17122 #endif /* _LINUX_SHM_H_ */
