1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux <<
2 #ifndef _UAPI_LINUX_SHM_H_ 1 #ifndef _UAPI_LINUX_SHM_H_
3 #define _UAPI_LINUX_SHM_H_ 2 #define _UAPI_LINUX_SHM_H_
4 3
5 #include <linux/ipc.h> 4 #include <linux/ipc.h>
6 #include <linux/errno.h> 5 #include <linux/errno.h>
7 #include <asm-generic/hugetlb_encode.h> <<
8 #ifndef __KERNEL__ 6 #ifndef __KERNEL__
9 #include <unistd.h> 7 #include <unistd.h>
10 #endif 8 #endif
11 9
12 /* 10 /*
13 * SHMMNI, SHMMAX and SHMALL are default upper !! 11 * SHMMAX, SHMMNI and SHMALL are upper limits are defaults which can
14 * modified by sysctl. The SHMMAX and SHMALL v !! 12 * be increased by sysctl
15 * be as large possible without facilitating s <<
16 * causes overflows when adjusting the limits <<
17 * "retrieve current limit; add X; update limi <<
18 * advised to make SHMMAX and SHMALL any large <<
19 * suitable for both 32 and 64-bit systems. <<
20 */ 13 */
>> 14
>> 15 #define SHMMAX 0x2000000 /* max shared seg size (bytes) */
21 #define SHMMIN 1 /* mi 16 #define SHMMIN 1 /* min shared seg size (bytes) */
22 #define SHMMNI 4096 /* ma 17 #define SHMMNI 4096 /* max num of segs system wide */
23 #define SHMMAX (ULONG_MAX - (1UL << 24)) /* ma !! 18 #ifndef __KERNEL__
24 #define SHMALL (ULONG_MAX - (1UL << 24)) /* ma !! 19 #define SHMALL (SHMMAX/getpagesize()*(SHMMNI/16))
>> 20 #endif
25 #define SHMSEG SHMMNI /* ma 21 #define SHMSEG SHMMNI /* max shared segs per process */
26 22
>> 23
27 /* Obsolete, used only for backwards compatibi 24 /* Obsolete, used only for backwards compatibility and libc5 compiles */
28 struct shmid_ds { 25 struct shmid_ds {
29 struct ipc_perm shm_perm; 26 struct ipc_perm shm_perm; /* operation perms */
30 int shm_segsz; 27 int shm_segsz; /* size of segment (bytes) */
31 __kernel_old_time_t shm_atime; !! 28 __kernel_time_t shm_atime; /* last attach time */
32 __kernel_old_time_t shm_dtime; !! 29 __kernel_time_t shm_dtime; /* last detach time */
33 __kernel_old_time_t shm_ctime; !! 30 __kernel_time_t shm_ctime; /* last change time */
34 __kernel_ipc_pid_t shm_cpid; 31 __kernel_ipc_pid_t shm_cpid; /* pid of creator */
35 __kernel_ipc_pid_t shm_lpid; 32 __kernel_ipc_pid_t shm_lpid; /* pid of last operator */
36 unsigned short shm_nattch; 33 unsigned short shm_nattch; /* no. of current attaches */
37 unsigned short shm_unused; 34 unsigned short shm_unused; /* compatibility */
38 void *shm_unused2; 35 void *shm_unused2; /* ditto - used by DIPC */
39 void *shm_unused3; 36 void *shm_unused3; /* unused */
40 }; 37 };
41 38
42 /* Include the definition of shmid64_ds and sh 39 /* Include the definition of shmid64_ds and shminfo64 */
43 #include <asm/shmbuf.h> 40 #include <asm/shmbuf.h>
44 41
45 /* !! 42 /* permission flag for shmget */
46 * shmget() shmflg values. <<
47 */ <<
48 /* The bottom nine bits are the same as open(2 <<
49 #define SHM_R 0400 /* or S_IRUGO 43 #define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
50 #define SHM_W 0200 /* or S_IWUGO 44 #define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
51 /* Bits 9 & 10 are IPC_CREAT and IPC_EXCL */ <<
52 #define SHM_HUGETLB 04000 /* segment wil <<
53 #define SHM_NORESERVE 010000 /* don't check <<
54 45
55 /* !! 46 /* mode for attach */
56 * Huge page size encoding when SHM_HUGETLB is <<
57 * size other than the default is desired. Se <<
58 */ <<
59 #define SHM_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SH <<
60 #define SHM_HUGE_MASK HUGETLB_FLAG_ENCODE_MA <<
61 <<
62 #define SHM_HUGE_64KB HUGETLB_FLAG_ENCODE_64 <<
63 #define SHM_HUGE_512KB HUGETLB_FLAG_ENCODE_51 <<
64 #define SHM_HUGE_1MB HUGETLB_FLAG_ENCODE_1M <<
65 #define SHM_HUGE_2MB HUGETLB_FLAG_ENCODE_2M <<
66 #define SHM_HUGE_8MB HUGETLB_FLAG_ENCODE_8M <<
67 #define SHM_HUGE_16MB HUGETLB_FLAG_ENCODE_16 <<
68 #define SHM_HUGE_32MB HUGETLB_FLAG_ENCODE_32 <<
69 #define SHM_HUGE_256MB HUGETLB_FLAG_ENCODE_25 <<
70 #define SHM_HUGE_512MB HUGETLB_FLAG_ENCODE_51 <<
71 #define SHM_HUGE_1GB HUGETLB_FLAG_ENCODE_1G <<
72 #define SHM_HUGE_2GB HUGETLB_FLAG_ENCODE_2G <<
73 #define SHM_HUGE_16GB HUGETLB_FLAG_ENCODE_16 <<
74 <<
75 /* <<
76 * shmat() shmflg values <<
77 */ <<
78 #define SHM_RDONLY 010000 /* read-only a 47 #define SHM_RDONLY 010000 /* read-only access */
79 #define SHM_RND 020000 /* round attac 48 #define SHM_RND 020000 /* round attach address to SHMLBA boundary */
80 #define SHM_REMAP 040000 /* take-over r 49 #define SHM_REMAP 040000 /* take-over region on attach */
81 #define SHM_EXEC 0100000 /* execution a 50 #define SHM_EXEC 0100000 /* execution access */
82 51
83 /* super user shmctl commands */ 52 /* super user shmctl commands */
84 #define SHM_LOCK 11 53 #define SHM_LOCK 11
85 #define SHM_UNLOCK 12 54 #define SHM_UNLOCK 12
86 55
87 /* ipcs ctl commands */ 56 /* ipcs ctl commands */
88 #define SHM_STAT 13 !! 57 #define SHM_STAT 13
89 #define SHM_INFO 14 !! 58 #define SHM_INFO 14
90 #define SHM_STAT_ANY 15 <<
91 59
92 /* Obsolete, used only for backwards compatibi 60 /* Obsolete, used only for backwards compatibility */
93 struct shminfo { 61 struct shminfo {
94 int shmmax; 62 int shmmax;
95 int shmmin; 63 int shmmin;
96 int shmmni; 64 int shmmni;
97 int shmseg; 65 int shmseg;
98 int shmall; 66 int shmall;
99 }; 67 };
100 68
101 struct shm_info { 69 struct shm_info {
102 int used_ids; 70 int used_ids;
103 __kernel_ulong_t shm_tot; /* tot !! 71 unsigned long shm_tot; /* total allocated shm */
104 __kernel_ulong_t shm_rss; /* tot !! 72 unsigned long shm_rss; /* total resident shm */
105 __kernel_ulong_t shm_swp; /* tot !! 73 unsigned long shm_swp; /* total swapped shm */
106 __kernel_ulong_t swap_attempts; !! 74 unsigned long swap_attempts;
107 __kernel_ulong_t swap_successes; !! 75 unsigned long swap_successes;
108 }; 76 };
109 77
110 78
111 #endif /* _UAPI_LINUX_SHM_H_ */ 79 #endif /* _UAPI_LINUX_SHM_H_ */
112 80
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