Quelle shm.h Sprache: 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_old_time_t shm_atime; /* last attach time */
__kernel_old_time_t shm_dtime; /* last detach time */
__kernel_old_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_ */

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