112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
||
|
|
#ifndef _UAPI_LINUX_SHM_H_
|
||
|
|
#define _UAPI_LINUX_SHM_H_
|
||
|
|
|
||
|
|
#include <linux/ipc.h>
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <asm-generic/hugetlb_encode.h>
|
||
|
|
#ifndef __KERNEL__
|
||
|
|
#include <unistd.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* SHMMNI, SHMMAX and SHMALL are default upper limits which can be
|
||
|
|
* modified by sysctl. The SHMMAX and SHMALL values have been chosen to
|
||
|
|
* be as large possible without facilitating scenarios where userspace
|
||
|
|
* causes overflows when adjusting the limits via operations of the form
|
||
|
|
* "retrieve current limit; add X; update limit". It is therefore not
|
||
|
|
* advised to make SHMMAX and SHMALL any larger. These limits are
|
||
|
|
* suitable for both 32 and 64-bit systems.
|
||
|
|
*/
|
||
|
|
#define SHMMIN 1 /* min shared seg size (bytes) */
|
||
|
|
#define SHMMNI 4096 /* max num of segs system wide */
|
||
|
|
#define SHMMAX (ULONG_MAX - (1UL << 24)) /* max shared seg size (bytes) */
|
||
|
|
#define SHMALL (ULONG_MAX - (1UL << 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>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* shmget() shmflg values.
|
||
|
|
*/
|
||
|
|
/* The bottom nine bits are the same as open(2) mode flags */
|
||
|
|
#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
|
||
|
|
#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
|
||
|
|
/* Bits 9 & 10 are IPC_CREAT and IPC_EXCL */
|
||
|
|
#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */
|
||
|
|
#define SHM_NORESERVE 010000 /* don't check for reservations */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Huge page size encoding when SHM_HUGETLB is specified, and a huge page
|
||
|
|
* size other than the default is desired. See hugetlb_encode.h
|
||
|
|
*/
|
||
|
|
#define SHM_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
|
||
|
|
#define SHM_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK
|
||
|
|
|
||
|
|
#define SHM_HUGE_64KB HUGETLB_FLAG_ENCODE_64KB
|
||
|
|
#define SHM_HUGE_512KB HUGETLB_FLAG_ENCODE_512KB
|
||
|
|
#define SHM_HUGE_1MB HUGETLB_FLAG_ENCODE_1MB
|
||
|
|
#define SHM_HUGE_2MB HUGETLB_FLAG_ENCODE_2MB
|
||
|
|
#define SHM_HUGE_8MB HUGETLB_FLAG_ENCODE_8MB
|
||
|
|
#define SHM_HUGE_16MB HUGETLB_FLAG_ENCODE_16MB
|
||
|
|
#define SHM_HUGE_32MB HUGETLB_FLAG_ENCODE_32MB
|
||
|
|
#define SHM_HUGE_256MB HUGETLB_FLAG_ENCODE_256MB
|
||
|
|
#define SHM_HUGE_512MB HUGETLB_FLAG_ENCODE_512MB
|
||
|
|
#define SHM_HUGE_1GB HUGETLB_FLAG_ENCODE_1GB
|
||
|
|
#define SHM_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB
|
||
|
|
#define SHM_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB
|
||
|
|
|
||
|
|
/*
|
||
|
|
* shmat() shmflg values
|
||
|
|
*/
|
||
|
|
#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;
|
||
|
|
__kernel_ulong_t shm_tot; /* total allocated shm */
|
||
|
|
__kernel_ulong_t shm_rss; /* total resident shm */
|
||
|
|
__kernel_ulong_t shm_swp; /* total swapped shm */
|
||
|
|
__kernel_ulong_t swap_attempts;
|
||
|
|
__kernel_ulong_t swap_successes;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* _UAPI_LINUX_SHM_H_ */
|