/* include/linux/shm.h * * modified by : marco corvi * date : feb 2001 * */ #ifndef _LINUX_SHM_H_ #define _LINUX_SHM_H_ #include #include 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 { /* * marco: added a link to the next shmid_kernel struct * and the id */ struct shmid_kernel * next; unsigned long id; 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 */ #define SHM_W 0200 /* or S_IWUGO from */ /* 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_ */