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 */ 25struct 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 */ 61struct shminfo { 62 int shmmax; 63 int shmmin; 64 int shmmni; 65 int shmseg; 66 int shmall; 67}; 68 69struct 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_ */ 80