include/uapi/linux/shm.h

   1 #ifndef _UAPI_LINUX_SHM_H_
   2 #define _UAPI_LINUX_SHM_H_
   3
   4 #include <linux/ipc.h>
   5 #include <linux/errno.h>
   6 #ifndef __KERNEL__
   7 #include <unistd.h>
   8 #endif
   9
  10 /*
  11  * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
  12  * be increased by sysctl
  13  */
  14
  15 #define SHMMAX 0x2000000                 /* max shared seg size (bytes) */
  16 #define SHMMIN 1                         /* min shared seg size (bytes) */
  17 #define SHMMNI 4096                      /* max num of segs system wide */
  18 #ifndef __KERNEL__
  19 #define SHMALL (SHMMAX/getpagesize()*(SHMMNI/16))
  20 #endif
  21 #define SHMSEG SHMMNI                    /* max shared segs per process */
  22
  23
  24 /* Obsolete, used only for backwards compatibility and libc5 compiles */
  25 struct shmid_ds {
  26         struct ipc_perm         shm_perm;       /* operation perms */
  27         int                     shm_segsz;      /* size of segment (bytes) */
  28         __kernel_time_t         shm_atime;      /* last attach time */
  29         __kernel_time_t         shm_dtime;      /* last detach time */
  30         __kernel_time_t         shm_ctime;      /* last change time */
  31         __kernel_ipc_pid_t      shm_cpid;       /* pid of creator */
  32         __kernel_ipc_pid_t      shm_lpid;       /* pid of last operator */
  33         unsigned short          shm_nattch;     /* no. of current attaches */
  34         unsigned short          shm_unused;     /* compatibility */
  35         void                    *shm_unused2;   /* ditto - used by DIPC */
  36         void                    *shm_unused3;   /* unused */
  37 };
  38
  39 /* Include the definition of shmid64_ds and shminfo64 */
  40 #include <asm/shmbuf.h>
  41
  42 /* permission flag for shmget */
  43 #define SHM_R           0400    /* or S_IRUGO from <linux/stat.h> */
  44 #define SHM_W           0200    /* or S_IWUGO from <linux/stat.h> */
  45
  46 /* mode for attach */
  47 #define SHM_RDONLY      010000  /* read-only access */
  48 #define SHM_RND         020000  /* round attach address to SHMLBA boundary */
  49 #define SHM_REMAP       040000  /* take-over region on attach */
  50 #define SHM_EXEC        0100000 /* execution access */
  51
  52 /* super user shmctl commands */
  53 #define SHM_LOCK        11
  54 #define SHM_UNLOCK      12
  55
  56 /* ipcs ctl commands */
  57 #define SHM_STAT        13
  58 #define SHM_INFO        14
  59
  60 /* Obsolete, used only for backwards compatibility */
  61 struct  shminfo {
  62         int shmmax;
  63         int shmmin;
  64         int shmmni;
  65         int shmseg;
  66         int shmall;
  67 };
  68
  69 struct shm_info {
  70         int used_ids;
  71         unsigned long shm_tot;  /* total allocated shm */
  72         unsigned long shm_rss;  /* total resident shm */
  73         unsigned long shm_swp;  /* total swapped shm */
  74         unsigned long swap_attempts;
  75         unsigned long swap_successes;
  76 };
  77
  78
  79 #endif /* _UAPI_LINUX_SHM_H_ */