5 #include <linux/errno.h>
9 * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
10 * be increased by sysctl
13 #define SHMMAX 0x2000000 /* max shared seg size (bytes) */
14 #define SHMMIN 1 /* min shared seg size (bytes) */
15 #define SHMMNI 4096 /* max num of segs system wide */
16 #define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */
17 #define SHMSEG SHMMNI /* max shared segs per process */
19 #include <asm/shmparam.h>
21 /* Obsolete, used only for backwards compatibility and libc5 compiles */
23 struct ipc_perm shm_perm; /* operation perms */
24 int shm_segsz; /* size of segment (bytes) */
25 __kernel_time_t shm_atime; /* last attach time */
26 __kernel_time_t shm_dtime; /* last detach time */
27 __kernel_time_t shm_ctime; /* last change time */
28 __kernel_ipc_pid_t shm_cpid; /* pid of creator */
29 __kernel_ipc_pid_t shm_lpid; /* pid of last operator */
30 unsigned short shm_nattch; /* no. of current attaches */
31 unsigned short shm_unused; /* compatibility */
32 void *shm_unused2; /* ditto - used by DIPC */
33 void *shm_unused3; /* unused */
36 /* Include the definition of shmid64_ds and shminfo64 */
37 #include <asm/shmbuf.h>
39 /* permission flag for shmget */
40 #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
41 #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
44 #define SHM_RDONLY 010000 /* read-only access */
45 #define SHM_RND 020000 /* round attach address to SHMLBA boundary */
46 #define SHM_REMAP 040000 /* take-over region on attach */
47 #define SHM_EXEC 0100000 /* execution access */
49 /* super user shmctl commands */
53 /* ipcs ctl commands */
57 /* Obsolete, used only for backwards compatibility */
68 unsigned long shm_tot; /* total allocated shm */
69 unsigned long shm_rss; /* total resident shm */
70 unsigned long shm_swp; /* total swapped shm */
71 unsigned long swap_attempts;
72 unsigned long swap_successes;
76 struct shmid_kernel /* private to the kernel */
78 struct kern_ipc_perm shm_perm;
79 struct file * shm_file;
81 unsigned long shm_nattch;
82 unsigned long shm_segsz;
88 struct user_struct *mlock_user;
91 /* shm_mode upper byte flags */
92 #define SHM_DEST 01000 /* segment will be destroyed on last detach */
93 #define SHM_LOCKED 02000 /* segment will not be swapped */
94 #define SHM_HUGETLB 04000 /* segment will use huge TLB pages */
95 #define SHM_NORESERVE 010000 /* don't check for reservations */
98 long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr);
100 static inline long do_shmat(int shmid, char __user *shmaddr,
101 int shmflg, unsigned long *addr)
107 #endif /* __KERNEL__ */
109 #endif /* _LINUX_SHM_H_ */