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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109/* 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>
/* * 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_ */