124 lines
3.3 KiB
C
124 lines
3.3 KiB
C
#ifndef _LINUX_SHM_H_
|
|
#define _LINUX_SHM_H_
|
|
|
|
#include <linux/ipc.h>
|
|
#include <linux/errno.h>
|
|
#ifdef __KERNEL__
|
|
#include <asm/page.h>
|
|
#else
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
/*
|
|
* SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
|
|
* be increased by sysctl
|
|
*/
|
|
|
|
#define SHMMAX 0x2000000 /* max shared seg size (bytes) */
|
|
#define SHMMIN 1 /* min shared seg size (bytes) */
|
|
#define SHMMNI 4096 /* max num of segs system wide */
|
|
#ifdef __KERNEL__
|
|
#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */
|
|
#else
|
|
#define SHMALL (SHMMAX/getpagesize()*(SHMMNI/16))
|
|
#endif
|
|
#define SHMSEG SHMMNI /* max shared segs per process */
|
|
|
|
#ifdef __KERNEL__
|
|
#include <asm/shmparam.h>
|
|
#endif
|
|
|
|
/* 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
|
|
|
|
/* 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;
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
struct shmid_kernel /* private to the kernel */
|
|
{
|
|
struct kern_ipc_perm shm_perm;
|
|
struct file * shm_file;
|
|
unsigned long shm_nattch;
|
|
unsigned long shm_segsz;
|
|
time_t shm_atim;
|
|
time_t shm_dtim;
|
|
time_t shm_ctim;
|
|
pid_t shm_cprid;
|
|
pid_t shm_lprid;
|
|
struct user_struct *mlock_user;
|
|
};
|
|
|
|
/* shm_mode upper byte flags */
|
|
#define SHM_DEST 01000 /* segment will be destroyed on last detach */
|
|
#define SHM_LOCKED 02000 /* segment will not be swapped */
|
|
#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */
|
|
#define SHM_NORESERVE 010000 /* don't check for reservations */
|
|
|
|
#ifdef CONFIG_SYSVIPC
|
|
long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr);
|
|
extern int is_file_shm_hugepages(struct file *file);
|
|
#else
|
|
static inline long do_shmat(int shmid, char __user *shmaddr,
|
|
int shmflg, unsigned long *addr)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
static inline int is_file_shm_hugepages(struct file *file)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _LINUX_SHM_H_ */
|