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1 | /* sys/shm.h |
| 2 | ||
| 1c001dd2 | 3 | Copyright 2001, 2002 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 | ||
| 1c001dd2 CS |
12 | #ifndef _SYS_SHM_H |
| 13 | #define _SYS_SHM_H | |
| 14 | ||
| 15 | #include <cygwin/ipc.h> | |
| 16 | ||
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17 | #ifdef __cplusplus |
| 18 | extern "C" | |
| 19 | { | |
| 20 | #endif | |
| 21 | ||
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22 | /* 64 Kb was hardcoded for x86. MS states this may change, but we need |
| 23 | * it in the header file. | |
| 24 | */ | |
| 25 | #define SHMLBA 65536 /* Segment low boundary address multiple. */ | |
| f449bfef | 26 | |
| 1c001dd2 | 27 | /* Shared memory operation flags: |
| f449bfef | 28 | */ |
| 1c001dd2 CS |
29 | #define SHM_RDONLY 0x01 /* Attach read-only (else read-write). */ |
| 30 | #define SHM_RND 0x02 /* Round attach address to SHMLBA. */ | |
| f449bfef | 31 | |
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32 | /* Command definitions for the semctl () function: |
| 33 | */ | |
| 34 | #define SHM_STAT 0x4000 /* For ipcs(8) */ | |
| 35 | #define SHM_INFO 0x4001 /* For ipcs(8) */ | |
| f449bfef | 36 | |
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37 | /* Unsigned integer used for the number of current attaches. |
| 38 | */ | |
| 39 | typedef unsigned int shmatt_t; | |
| f449bfef | 40 | |
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41 | struct shmid_ds |
| 42 | { | |
| 43 | struct ipc_perm shm_perm; /* Operation permission structure. */ | |
| 44 | size_t shm_segsz; /* Size of segment in bytes. */ | |
| 45 | pid_t shm_lpid; /* Process ID of last operation. */ | |
| 46 | pid_t shm_cpid; /* Process ID of creator. */ | |
| 47 | shmatt_t shm_nattch; /* Number of current attaches. */ | |
| 48 | timestruc_t shm_atim; /* Time of last shmat (). */ | |
| 49 | timestruc_t shm_dtim; /* Time of last shmdt (). */ | |
| 50 | timestruc_t shm_ctim; /* Time of last change by shmctl (). */ | |
| 51 | long shm_spare4[2]; | |
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52 | }; |
| 53 | ||
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54 | #define shm_atime shm_atim.tv_sec |
| 55 | #define shm_dtime shm_dtim.tv_sec | |
| 56 | #define shm_ctime shm_ctim.tv_sec | |
| f449bfef | 57 | |
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58 | /* Buffer type for shmctl (IPC_INFO, ...) as used by ipcs(8). |
| 59 | */ | |
| 60 | struct shminfo | |
| 61 | { | |
| 62 | unsigned long shmmax; /* Maximum size in bytes of a shared | |
| 63 | memory segment. */ | |
| 64 | unsigned long shmmin; /* Minimum size in bytes of a shared | |
| 65 | memory segment. */ | |
| 66 | unsigned long shmmni; /* Maximum number of shared memory | |
| 67 | segments, system wide. */ | |
| 68 | unsigned long shmseg; /* Maximum number of shared memory | |
| 69 | segments attached per process. */ | |
| 70 | unsigned long shmall; /* Maximum number of bytes of shared | |
| 71 | memory, system wide. */ | |
| 72 | unsigned long shm_spare[4]; | |
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73 | }; |
| 74 | ||
| 1c001dd2 | 75 | /* Buffer type for shmctl (SHM_INFO, ...) as used by ipcs(8). |
| f449bfef | 76 | */ |
| 1c001dd2 CS |
77 | struct shm_info |
| 78 | { | |
| 79 | unsigned long shm_ids; /* Number of allocated segments. */ | |
| 80 | unsigned long shm_tot; /* Size in bytes of allocated segments. */ | |
| 81 | unsigned long shm_atts; /* Number of attached segments, system | |
| 82 | wide. */ | |
| f449bfef | 83 | }; |
| f449bfef | 84 | |
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85 | void *shmat (int shmid, const void *shmaddr, int shmflg); |
| 86 | int shmctl (int shmid, int cmd, struct shmid_ds *buf); | |
| 87 | int shmdt (const void *shmaddr); | |
| 88 | int shmget (key_t key, size_t size, int shmflg); | |
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89 | |
| 90 | #ifdef __cplusplus | |
| 91 | } | |
| 92 | #endif | |
| 1c001dd2 CS |
93 | |
| 94 | #endif /* _SYS_SHM_H */ |