110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
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/* 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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