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111 lines
3.7 KiB
111 lines
3.7 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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#ifndef _UAPI_LINUX_SHM_H_ |
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#define _UAPI_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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#ifndef __KERNEL__ |
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#include <unistd.h> |
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#endif |
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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_old_time_t shm_atime; /* last attach time */ |
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__kernel_old_time_t shm_dtime; /* last detach time */ |
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__kernel_old_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 /* _UAPI_LINUX_SHM_H_ */
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