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- #ifndef _LINUX_SHM_H_
- #define _LINUX_SHM_H_
-
- #include <linux/ipc.h>
-
- #include <asm/shmparam.h>
-
- struct shmid_ds {
- struct ipc_perm shm_perm; /* operation perms */
- int shm_segsz; /* size of segment (bytes) */
- __kernel_time_t shm_atime; /* last attach time */
- __kernel_time_t shm_dtime; /* last detach time */
- __kernel_time_t shm_ctime; /* last change time */
- __kernel_ipc_pid_t shm_cpid; /* pid of creator */
- __kernel_ipc_pid_t shm_lpid; /* pid of last operator */
- unsigned short shm_nattch; /* no. of current attaches */
- unsigned short shm_unused; /* compatibility */
- void *shm_unused2; /* ditto - used by DIPC */
- void *shm_unused3; /* unused */
- };
-
- struct shmid_kernel
- {
- struct shmid_ds u;
- /* the following are private */
- unsigned long shm_npages; /* size of segment (pages) */
- unsigned long *shm_pages; /* array of ptrs to frames -> SHMMAX */
- struct vm_area_struct *attaches; /* descriptors for attaches */
- };
-
- /* permission flag for shmget */
- #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
- #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
-
- /* mode for attach */
- #define SHM_RDONLY 010000 /* read-only access */
- #define SHM_RND 020000 /* round attach address to SHMLBA boundary */
- #define SHM_REMAP 040000 /* take-over region on attach */
-
- /* super user shmctl commands */
- #define SHM_LOCK 11
- #define SHM_UNLOCK 12
-
- /* ipcs ctl commands */
- #define SHM_STAT 13
- #define SHM_INFO 14
-
- struct shminfo {
- int shmmax;
- int shmmin;
- int shmmni;
- int shmseg;
- int shmall;
- };
-
- struct shm_info {
- int used_ids;
- unsigned long shm_tot; /* total allocated shm */
- unsigned long shm_rss; /* total resident shm */
- unsigned long shm_swp; /* total swapped shm */
- unsigned long swap_attempts;
- unsigned long swap_successes;
- };
-
- #ifdef __KERNEL__
-
- /* shm_mode upper byte flags */
- #define SHM_DEST 01000 /* segment will be destroyed on last detach */
- #define SHM_LOCKED 02000 /* segment will not be swapped */
-
- asmlinkage int sys_shmget (key_t key, int size, int flag);
- asmlinkage int sys_shmat (int shmid, char *shmaddr, int shmflg, unsigned long *addr);
- asmlinkage int sys_shmdt (char *shmaddr);
- asmlinkage int sys_shmctl (int shmid, int cmd, struct shmid_ds *buf);
- extern void shm_unuse(unsigned long entry, unsigned long page);
-
- #endif /* __KERNEL__ */
-
- #endif /* _LINUX_SHM_H_ */
-