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Length: 2521 (0x9d9)
Types: TextFile
Notes: UNIX file
Names: »swap.h«
└─⟦a6ab2eb36⟧ Bits:30004042/kconfig3.imd SW95705I 386/ix Multi-user Release 1.2
└─⟦a6ab2eb36⟧ UNIX Filesystem
└─⟦this⟧ »kc/new/usr/include/sys/swap.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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */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 "@(#)swap.h 1.3"
/* The following structure contains the data describing a
* swap file.
*/
typedef struct swaptab {
dev_t st_dev; /* The swap device. */
short st_flags; /* Flags defined below. */
use_t *st_ucnt; /* Ptr to use count array for */
/* pages on swap. */
use_t *st_next; /* Ptr to next page to start */
/* searching at. */
int st_swplo; /* First block number on device */
/* to be used for swapping. */
int st_npgs; /* Number of pages of swap */
/* space on device. */
int st_nfpgs; /* Nbr of free pages on device. */
} swpt_t;
#define ST_INDEL 0x01 /* This file is in the process */
/* of being deleted. Don't */
/* allocate from it. */
extern swpt_t swaptab[]; /* The table of swap files. */
extern int nextswap;; /* Index into swptab to the */
/* next file to allocate from. */
extern int swapwant; /* Set non-zero if someone is */
/* waiting for swap space. */
#define MSFILES 16 /* The maximum number of swap */
/* files which can be allocated.*/
/* It is limited by the size of */
/* the dbd_swpi field in the */
/* dbd_t structure. */
/* The following struct is used by the sys3b system call.
* If the first argument to the sys3b system call is 3,
* then the call pertains to the swap file. In this case,
* the second argument is a pointer to a structure of the
* following format which contains the parameters for the
* operation to be performed.
*/
typedef struct swapint {
char si_cmd; /* One of the command codes */
/* listed below. */
char *si_buf; /* For an SI_LIST function, this*/
/* is a pointer to a buffer of */
/* sizeof(swpt_t)*MSFILES bytes.*/
/* For the other cases, it is a */
/* pointer to a pathname of a */
/* swap file. */
int si_swplo; /* The first block number of the*/
/* swap file. Used only for */
/* SI_ADD and SI_DEL. */
int si_nblks; /* The size of the swap file in */
/* blocks. Used only for an */
/* SI_ADD request. */
} swpi_t;
/* The following are the possible values for si_cmd.
*/
#define SI_LIST 0 /* List the currently active */
/* swap files. */
#define SI_ADD 1 /* Add a new swap file. */
#define SI_DEL 2 /* Delete one of the currently */
/* active swap files. */