107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/* sys/shm.h
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Copyright 2001, 2002 Red Hat Inc.
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Written by Robert Collins <rbtcollins@hotmail.com>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef _CYGWIN_SHM_H
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#define _CYGWIN_SHM_H
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#include <cygwin/ipc.h>
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#include <sys/cygwin.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* Segment low boundary address multiple.
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*
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* 64 Kb was hardcoded for x86. MS states this may change so the constant
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* expression is replaced by a function call returning the correct value. */
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#define SHMLBA (cygwin_internal (CW_GET_SHMLBA))
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/* Shared memory operation flags:
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*/
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#define SHM_RDONLY 0x01 /* Attach read-only (else read-write). */
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#define SHM_RND 0x02 /* Round attach address to SHMLBA. */
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#ifdef _KERNEL
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/* Command definitions for the semctl () function:
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*/
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#define SHM_STAT 0x4000 /* For ipcs(8) */
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#define SHM_INFO 0x4001 /* For ipcs(8) */
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#endif /* _KERNEL */
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/* Unsigned integer used for the number of current attaches.
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*/
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typedef unsigned int shmatt_t;
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struct shmid_ds
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{
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struct ipc_perm shm_perm; /* Operation permission structure. */
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size_t shm_segsz; /* Size of segment in bytes. */
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pid_t shm_lpid; /* Process ID of last operation. */
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pid_t shm_cpid; /* Process ID of creator. */
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shmatt_t shm_nattch;/* Number of current attaches. */
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timestruc_t shm_atim; /* Time of last shmat (). */
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timestruc_t shm_dtim; /* Time of last shmdt (). */
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timestruc_t shm_ctim; /* Time of last change by shmctl (). */
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#ifdef _KERNEL
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struct shm_handle *shm_internal;
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long shm_spare4[1];
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#else
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long shm_spare4[2];
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#endif /* _KERNEL */
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};
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#define shm_atime shm_atim.tv_sec
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#define shm_dtime shm_dtim.tv_sec
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#define shm_ctime shm_ctim.tv_sec
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#ifdef _KERNEL
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/* Buffer type for shmctl (IPC_INFO, ...) as used by ipcs(8).
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*/
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struct shminfo
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{
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long shmmax; /* Maximum size in bytes of a shared
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memory segment. */
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long shmmin; /* Minimum size in bytes of a shared
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memory segment. */
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long shmmni; /* Maximum number of shared memory
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segments, system wide. */
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long shmseg; /* Maximum number of shared memory
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segments attached per process. */
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long shmall; /* Maximum number of bytes of shared
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memory, system wide. */
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long shm_spare[4];
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};
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/* Buffer type for shmctl (SHM_INFO, ...) as used by ipcs(8).
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*/
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struct shm_info
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{
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#define shm_ids used_ids
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long used_ids; /* Number of allocated segments. */
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long shm_tot; /* Size in bytes of allocated segments. */
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long shm_atts; /* Number of attached segments, system
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wide. */
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};
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#endif /* _KERNEL */
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void *shmat (int shmid, const void *shmaddr, int shmflg);
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int shmctl (int shmid, int cmd, struct shmid_ds *buf);
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int shmdt (const void *shmaddr);
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int shmget (key_t key, size_t size, int shmflg);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CYGWIN_SHM_H */
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