Greg Kroah-Hartman | 6f52b16 | 2017-11-01 15:08:43 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 2 | #ifndef _UAPI_LINUX_SHM_H_ |
| 3 | #define _UAPI_LINUX_SHM_H_ |
| 4 | |
| 5 | #include <linux/ipc.h> |
| 6 | #include <linux/errno.h> |
Mike Kravetz | 4da243a | 2017-09-06 16:23:33 -0700 | [diff] [blame] | 7 | #include <asm-generic/hugetlb_encode.h> |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 8 | #ifndef __KERNEL__ |
| 9 | #include <unistd.h> |
| 10 | #endif |
| 11 | |
| 12 | /* |
Davidlohr Bueso | f57a19a | 2014-06-06 14:37:43 -0700 | [diff] [blame] | 13 | * SHMMNI, SHMMAX and SHMALL are default upper limits which can be |
| 14 | * modified by sysctl. The SHMMAX and SHMALL values have been chosen to |
| 15 | * be as large possible without facilitating scenarios where userspace |
| 16 | * causes overflows when adjusting the limits via operations of the form |
| 17 | * "retrieve current limit; add X; update limit". It is therefore not |
| 18 | * advised to make SHMMAX and SHMALL any larger. These limits are |
| 19 | * suitable for both 32 and 64-bit systems. |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 20 | */ |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 21 | #define SHMMIN 1 /* min shared seg size (bytes) */ |
| 22 | #define SHMMNI 4096 /* max num of segs system wide */ |
Davidlohr Bueso | f57a19a | 2014-06-06 14:37:43 -0700 | [diff] [blame] | 23 | #define SHMMAX (ULONG_MAX - (1UL << 24)) /* max shared seg size (bytes) */ |
| 24 | #define SHMALL (ULONG_MAX - (1UL << 24)) /* max shm system wide (pages) */ |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 25 | #define SHMSEG SHMMNI /* max shared segs per process */ |
| 26 | |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 27 | /* Obsolete, used only for backwards compatibility and libc5 compiles */ |
| 28 | struct shmid_ds { |
| 29 | struct ipc_perm shm_perm; /* operation perms */ |
| 30 | int shm_segsz; /* size of segment (bytes) */ |
| 31 | __kernel_time_t shm_atime; /* last attach time */ |
| 32 | __kernel_time_t shm_dtime; /* last detach time */ |
| 33 | __kernel_time_t shm_ctime; /* last change time */ |
| 34 | __kernel_ipc_pid_t shm_cpid; /* pid of creator */ |
| 35 | __kernel_ipc_pid_t shm_lpid; /* pid of last operator */ |
| 36 | unsigned short shm_nattch; /* no. of current attaches */ |
| 37 | unsigned short shm_unused; /* compatibility */ |
| 38 | void *shm_unused2; /* ditto - used by DIPC */ |
| 39 | void *shm_unused3; /* unused */ |
| 40 | }; |
| 41 | |
| 42 | /* Include the definition of shmid64_ds and shminfo64 */ |
| 43 | #include <asm/shmbuf.h> |
| 44 | |
Mike Kravetz | 4da243a | 2017-09-06 16:23:33 -0700 | [diff] [blame] | 45 | /* |
| 46 | * shmget() shmflg values. |
| 47 | */ |
| 48 | /* The bottom nine bits are the same as open(2) mode flags */ |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 49 | #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */ |
| 50 | #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */ |
Mike Kravetz | 4da243a | 2017-09-06 16:23:33 -0700 | [diff] [blame] | 51 | /* Bits 9 & 10 are IPC_CREAT and IPC_EXCL */ |
| 52 | #define SHM_HUGETLB 04000 /* segment will use huge TLB pages */ |
| 53 | #define SHM_NORESERVE 010000 /* don't check for reservations */ |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 54 | |
Mike Kravetz | 4da243a | 2017-09-06 16:23:33 -0700 | [diff] [blame] | 55 | /* |
| 56 | * Huge page size encoding when SHM_HUGETLB is specified, and a huge page |
| 57 | * size other than the default is desired. See hugetlb_encode.h |
| 58 | */ |
| 59 | #define SHM_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT |
| 60 | #define SHM_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK |
| 61 | |
| 62 | #define SHM_HUGE_64KB HUGETLB_FLAG_ENCODE_64KB |
| 63 | #define SHM_HUGE_512KB HUGETLB_FLAG_ENCODE_512KB |
| 64 | #define SHM_HUGE_1MB HUGETLB_FLAG_ENCODE_1MB |
| 65 | #define SHM_HUGE_2MB HUGETLB_FLAG_ENCODE_2MB |
| 66 | #define SHM_HUGE_8MB HUGETLB_FLAG_ENCODE_8MB |
| 67 | #define SHM_HUGE_16MB HUGETLB_FLAG_ENCODE_16MB |
| 68 | #define SHM_HUGE_256MB HUGETLB_FLAG_ENCODE_256MB |
| 69 | #define SHM_HUGE_1GB HUGETLB_FLAG_ENCODE_1GB |
| 70 | #define SHM_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB |
| 71 | #define SHM_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB |
| 72 | |
| 73 | /* |
| 74 | * shmat() shmflg values |
| 75 | */ |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 76 | #define SHM_RDONLY 010000 /* read-only access */ |
| 77 | #define SHM_RND 020000 /* round attach address to SHMLBA boundary */ |
| 78 | #define SHM_REMAP 040000 /* take-over region on attach */ |
| 79 | #define SHM_EXEC 0100000 /* execution access */ |
| 80 | |
| 81 | /* super user shmctl commands */ |
| 82 | #define SHM_LOCK 11 |
| 83 | #define SHM_UNLOCK 12 |
| 84 | |
| 85 | /* ipcs ctl commands */ |
| 86 | #define SHM_STAT 13 |
| 87 | #define SHM_INFO 14 |
| 88 | |
| 89 | /* Obsolete, used only for backwards compatibility */ |
| 90 | struct shminfo { |
| 91 | int shmmax; |
| 92 | int shmmin; |
| 93 | int shmmni; |
| 94 | int shmseg; |
| 95 | int shmall; |
| 96 | }; |
| 97 | |
| 98 | struct shm_info { |
| 99 | int used_ids; |
H.J. Lu | f8dcdf0 | 2013-12-27 14:14:23 -0800 | [diff] [blame] | 100 | __kernel_ulong_t shm_tot; /* total allocated shm */ |
| 101 | __kernel_ulong_t shm_rss; /* total resident shm */ |
| 102 | __kernel_ulong_t shm_swp; /* total swapped shm */ |
| 103 | __kernel_ulong_t swap_attempts; |
| 104 | __kernel_ulong_t swap_successes; |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 105 | }; |
| 106 | |
| 107 | |
| 108 | #endif /* _UAPI_LINUX_SHM_H_ */ |