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 __kernel_ulong_t shm_tot; /* total allocated shm */ 72 __kernel_ulong_t shm_rss; /* total resident shm */ 73 __kernel_ulong_t shm_swp; /* total swapped shm */ 74 __kernel_ulong_t swap_attempts; 75 __kernel_ulong_t swap_successes; 76 }; 77 78 79 #endif /* _UAPI_LINUX_SHM_H_ */ 80