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Length: 2016 (0x7e0)
Types: TextFile
Notes: UNIX file
Names: »shm.h«
└─⟦a6ab2eb36⟧ Bits:30004042/kconfig3.imd SW95705I 386/ix Multi-user Release 1.2
└─⟦a6ab2eb36⟧ UNIX Filesystem
└─⟦this⟧ »kc/new/usr/include/sys/shm.h«
/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
/* The copyright notice above does not evidence any */
/* actual or intended publication of such source code. */
#ident "@(#)shm.h 1.4 - 86/11/18"
/*
** IPC Shared Memory Facility.
*/
/*
** Implementation Constants.
*/
#define SHMLBA ctob(stoc(1)) /* segment low boundary address multiple */
/* (SHMLBA must be a power of 2) */
/*
** Permission Definitions.
*/
#define SHM_R 0400 /* read permission */
#define SHM_W 0200 /* write permission */
/*
** ipc_perm Mode Definitions.
*/
#define SHM_INIT 01000 /* grow segment on next attach */
#define SHM_DEST 02000 /* destroy segment when # attached = 0 */
/*
** Message Operation Flags.
*/
#define SHM_RDONLY 010000 /* attach read-only (else read-write) */
#define SHM_RND 020000 /* round attach address to SHMLBA */
/*
** Structure Definitions.
*/
/*
** There is a shared mem id data structure for each segment in the system.
*/
struct shmid_ds {
struct ipc_perm shm_perm; /* operation permission struct */
int shm_segsz; /* size of segment in bytes */
struct region *shm_reg; /* ptr to region structure */
char pad[4]; /* for swap compatibility */
ushort shm_lpid; /* pid of last shmop */
ushort shm_cpid; /* pid of creator */
ushort shm_nattch; /* used only for shminfo */
ushort shm_cnattch; /* used only for shminfo */
time_t shm_atime; /* last shmat time */
time_t shm_dtime; /* last shmdt time */
time_t shm_ctime; /* last change time */
};
struct shminfo {
int shmmax, /* max shared memory segment size */
shmmin, /* min shared memory segment size */
shmmni, /* # of shared memory identifiers */
shmseg, /* max attached shared memory */
/* segments per process */
shmall; /* max total shared memory system */
/* wide (in clicks) */
};
/*
* Shared memory control operations
*/
#define SHM_LOCK 3 /* Lock segment in core */
#define SHM_UNLOCK 4 /* Unlock segment */