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