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#ifndef _LINUX_SHM_H_ #define _LINUX_SHM_H_ #include <linux/ipc.h> #include <linux/errno.h> #include <unistd.h> /* * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can * be modified by sysctl. */ #define SHMMIN 1 /* min shared seg size (bytes) */ #define SHMMNI 4096 /* max num of segs system wide */ #define SHMMAX (ULONG_MAX - (1L<<24)) /* max shared seg size (bytes) */ #define SHMALL (ULONG_MAX - (1L<<24)) /* max shm system wide (pages) */ #define SHMSEG SHMMNI /* max shared segs per process */ /* Obsolete, used only for backwards compatibility and libc5 compiles */ struct shmid_ds { struct ipc_perm shm_perm; /* operation perms */ int shm_segsz; /* size of segment (bytes) */ __kernel_time_t shm_atime; /* last attach time */ __kernel_time_t shm_dtime; /* last detach time */ __kernel_time_t shm_ctime; /* last change time */ __kernel_ipc_pid_t shm_cpid; /* pid of creator */ __kernel_ipc_pid_t shm_lpid; /* pid of last operator */ unsigned short shm_nattch; /* no. of current attaches */ unsigned short shm_unused; /* compatibility */ void *shm_unused2; /* ditto - used by DIPC */ void *shm_unused3; /* unused */ }; /* Include the definition of shmid64_ds and shminfo64 */ #include <asm/shmbuf.h> /* permission flag for shmget */ #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */ #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */ /* mode for attach */ #define SHM_RDONLY 010000 /* read-only access */ #define SHM_RND 020000 /* round attach address to SHMLBA boundary */ #define SHM_REMAP 040000 /* take-over region on attach */ #define SHM_EXEC 0100000 /* execution access */ /* super user shmctl commands */ #define SHM_LOCK 11 #define SHM_UNLOCK 12 /* ipcs ctl commands */ #define SHM_STAT 13 #define SHM_INFO 14 #define SHM_STAT_ANY 15 /* Obsolete, used only for backwards compatibility */ struct shminfo { int shmmax; int shmmin; int shmmni; int shmseg; int shmall; }; struct shm_info { int used_ids; unsigned long shm_tot; /* total allocated shm */ unsigned long shm_rss; /* total resident shm */ unsigned long shm_swp; /* total swapped shm */ unsigned long swap_attempts; unsigned long swap_successes; }; #endif /* _LINUX_SHM_H_ */