/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _LINUX_SHM_H_

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#define _LINUX_SHM_H_

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#include <linux/ipc.h>

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#include <linux/errno.h>

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#include <asm-generic/hugetlb_encode.h>

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#include <unistd.h>

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/*

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* SHMMNI, SHMMAX and SHMALL are default upper limits which can be

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* modified by sysctl. The SHMMAX and SHMALL values have been chosen to

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* be as large possible without facilitating scenarios where userspace

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* causes overflows when adjusting the limits via operations of the form

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* "retrieve current limit; add X; update limit". It is therefore not

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* advised to make SHMMAX and SHMALL any larger. These limits are

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* suitable for both 32 and 64-bit systems.

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*/

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#define SHMMIN 1 /* min shared seg size (bytes) */

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#define SHMMNI 4096 /* max num of segs system wide */

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#define SHMMAX (ULONG_MAX - (1UL << 24)) /* max shared seg size (bytes) */

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#define SHMALL (ULONG_MAX - (1UL << 24)) /* max shm system wide (pages) */

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#define SHMSEG SHMMNI /* max shared segs per process */

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/* Obsolete, used only for backwards compatibility and libc5 compiles */

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struct shmid_ds {

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struct ipc_perm shm_perm; /* operation perms */

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int shm_segsz; /* size of segment (bytes) */

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__kernel_time_t shm_atime; /* last attach time */

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__kernel_time_t shm_dtime; /* last detach time */

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__kernel_time_t shm_ctime; /* last change time */

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__kernel_ipc_pid_t shm_cpid; /* pid of creator */

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__kernel_ipc_pid_t shm_lpid; /* pid of last operator */

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unsigned short shm_nattch; /* no. of current attaches */

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unsigned short shm_unused; /* compatibility */

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void *shm_unused2; /* ditto - used by DIPC */

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void *shm_unused3; /* unused */

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};

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/* Include the definition of shmid64_ds and shminfo64 */

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#include <asm/shmbuf.h>

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/*

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* shmget() shmflg values.

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*/

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/* The bottom nine bits are the same as open(2) mode flags */

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#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */

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#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */

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/* Bits 9 & 10 are IPC_CREAT and IPC_EXCL */

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#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */

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#define SHM_NORESERVE 010000 /* don't check for reservations */

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/*

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* Huge page size encoding when SHM_HUGETLB is specified, and a huge page

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* size other than the default is desired. See hugetlb_encode.h

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*/

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#define SHM_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT

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#define SHM_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK

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#define SHM_HUGE_64KB HUGETLB_FLAG_ENCODE_64KB

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#define SHM_HUGE_512KB HUGETLB_FLAG_ENCODE_512KB

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#define SHM_HUGE_1MB HUGETLB_FLAG_ENCODE_1MB

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#define SHM_HUGE_2MB HUGETLB_FLAG_ENCODE_2MB

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#define SHM_HUGE_8MB HUGETLB_FLAG_ENCODE_8MB

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#define SHM_HUGE_16MB HUGETLB_FLAG_ENCODE_16MB

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#define SHM_HUGE_32MB HUGETLB_FLAG_ENCODE_32MB

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#define SHM_HUGE_256MB HUGETLB_FLAG_ENCODE_256MB

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#define SHM_HUGE_512MB HUGETLB_FLAG_ENCODE_512MB

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#define SHM_HUGE_1GB HUGETLB_FLAG_ENCODE_1GB

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#define SHM_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB

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#define SHM_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB

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/*

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* shmat() shmflg values

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*/

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#define SHM_RDONLY 010000 /* read-only access */

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#define SHM_RND 020000 /* round attach address to SHMLBA boundary */

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#define SHM_REMAP 040000 /* take-over region on attach */

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#define SHM_EXEC 0100000 /* execution access */

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/* super user shmctl commands */

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#define SHM_LOCK 11

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#define SHM_UNLOCK 12

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/* ipcs ctl commands */

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#define SHM_STAT 13

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#define SHM_INFO 14

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#define SHM_STAT_ANY 15

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/* Obsolete, used only for backwards compatibility */

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struct shminfo {

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int shmmax;

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int shmmin;

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int shmmni;

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int shmseg;

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int shmall;

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};

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struct shm_info {

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int used_ids;

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__kernel_ulong_t shm_tot; /* total allocated shm */

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__kernel_ulong_t shm_rss; /* total resident shm */

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__kernel_ulong_t shm_swp; /* total swapped shm */

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__kernel_ulong_t swap_attempts;

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__kernel_ulong_t swap_successes;

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};

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#endif /* _LINUX_SHM_H_ */

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