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f449bfef RC |
1 | /* sys/shm.h |
2 | ||
61522196 | 3 | Copyright 2001, 2002, 2012, 2013 Red Hat Inc. |
f449bfef RC |
4 | Written by Robert Collins <rbtcollins@hotmail.com> |
5 | ||
6 | This file is part of Cygwin. | |
7 | ||
8 | This software is a copyrighted work licensed under the terms of the | |
9 | Cygwin license. Please consult the file "CYGWIN_LICENSE" for | |
10 | details. */ | |
11 | ||
a6df500f CV |
12 | #ifndef _CYGWIN_SHM_H |
13 | #define _CYGWIN_SHM_H | |
1c001dd2 CS |
14 | |
15 | #include <cygwin/ipc.h> | |
a6df500f | 16 | #include <sys/cygwin.h> |
1c001dd2 | 17 | |
f449bfef RC |
18 | #ifdef __cplusplus |
19 | extern "C" | |
20 | { | |
21 | #endif | |
22 | ||
a6df500f CV |
23 | /* Segment low boundary address multiple. |
24 | * | |
25 | * 64 Kb was hardcoded for x86. MS states this may change so the constant | |
26 | * expression is replaced by a function call returning the correct value. */ | |
27 | #define SHMLBA (cygwin_internal (CW_GET_SHMLBA)) | |
f449bfef | 28 | |
1c001dd2 | 29 | /* Shared memory operation flags: |
f449bfef | 30 | */ |
1c001dd2 CS |
31 | #define SHM_RDONLY 0x01 /* Attach read-only (else read-write). */ |
32 | #define SHM_RND 0x02 /* Round attach address to SHMLBA. */ | |
f449bfef | 33 | |
a6df500f | 34 | #ifdef _KERNEL |
1c001dd2 CS |
35 | /* Command definitions for the semctl () function: |
36 | */ | |
37 | #define SHM_STAT 0x4000 /* For ipcs(8) */ | |
38 | #define SHM_INFO 0x4001 /* For ipcs(8) */ | |
a6df500f | 39 | #endif /* _KERNEL */ |
f449bfef | 40 | |
1c001dd2 CS |
41 | /* Unsigned integer used for the number of current attaches. |
42 | */ | |
61522196 | 43 | typedef uint32_t shmatt_t; |
f449bfef | 44 | |
1c001dd2 CS |
45 | struct shmid_ds |
46 | { | |
a6df500f | 47 | struct ipc_perm shm_perm; /* Operation permission structure. */ |
61522196 | 48 | uint32_t shm_segsz; /* Size of segment in bytes. */ |
a6df500f CV |
49 | pid_t shm_lpid; /* Process ID of last operation. */ |
50 | pid_t shm_cpid; /* Process ID of creator. */ | |
51 | shmatt_t shm_nattch;/* Number of current attaches. */ | |
52 | timestruc_t shm_atim; /* Time of last shmat (). */ | |
53 | timestruc_t shm_dtim; /* Time of last shmdt (). */ | |
54 | timestruc_t shm_ctim; /* Time of last change by shmctl (). */ | |
55 | #ifdef _KERNEL | |
56 | struct shm_handle *shm_internal; | |
57 | long shm_spare4[1]; | |
58 | #else | |
59 | long shm_spare4[2]; | |
60 | #endif /* _KERNEL */ | |
f449bfef RC |
61 | }; |
62 | ||
1c001dd2 CS |
63 | #define shm_atime shm_atim.tv_sec |
64 | #define shm_dtime shm_dtim.tv_sec | |
65 | #define shm_ctime shm_ctim.tv_sec | |
f449bfef | 66 | |
a6df500f | 67 | #ifdef _KERNEL |
1c001dd2 CS |
68 | /* Buffer type for shmctl (IPC_INFO, ...) as used by ipcs(8). |
69 | */ | |
70 | struct shminfo | |
71 | { | |
61522196 | 72 | int32_t shmmax; /* Maximum size in bytes of a shared |
a6df500f | 73 | memory segment. */ |
61522196 | 74 | int32_t shmmin; /* Minimum size in bytes of a shared |
a6df500f | 75 | memory segment. */ |
61522196 | 76 | int32_t shmmni; /* Maximum number of shared memory |
a6df500f | 77 | segments, system wide. */ |
61522196 | 78 | int32_t shmseg; /* Maximum number of shared memory |
a6df500f | 79 | segments attached per process. */ |
61522196 CV |
80 | int32_t shmall; /* Maximum number of bytes of shared |
81 | memory, system wide. | |
82 | Note that XSI IPC shared memory allocation is | |
83 | restricted to a bit less than 2 Gigs, even on | |
84 | 64 bit, so using an int32_t here is sufficient. */ | |
85 | int32_t shm_spare[4]; | |
f449bfef RC |
86 | }; |
87 | ||
1c001dd2 | 88 | /* Buffer type for shmctl (SHM_INFO, ...) as used by ipcs(8). |
f449bfef | 89 | */ |
1c001dd2 CS |
90 | struct shm_info |
91 | { | |
a6df500f | 92 | #define shm_ids used_ids |
61522196 CV |
93 | int32_t used_ids; /* Number of allocated segments. */ |
94 | int32_t shm_tot; /* Size in bytes of allocated segments. */ | |
95 | int32_t shm_atts; /* Number of attached segments, system | |
a6df500f | 96 | wide. */ |
f449bfef | 97 | }; |
a6df500f | 98 | #endif /* _KERNEL */ |
f449bfef | 99 | |
1c001dd2 CS |
100 | void *shmat (int shmid, const void *shmaddr, int shmflg); |
101 | int shmctl (int shmid, int cmd, struct shmid_ds *buf); | |
102 | int shmdt (const void *shmaddr); | |
103 | int shmget (key_t key, size_t size, int shmflg); | |
f449bfef RC |
104 | |
105 | #ifdef __cplusplus | |
106 | } | |
107 | #endif | |
1c001dd2 | 108 | |
a6df500f | 109 | #endif /* _CYGWIN_SHM_H */ |