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/*
This file is part of SUPPL - the supplemental library for DOS
Copyright (C) 1996-2000 Steffen Kaiser
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: MCB.H 2.6 2002/07/30 05:39:53 ska Exp ska $
* $Locker: ska $ $Name: $ $State: Exp $
*
* header file for the MCB handling functions
*/
#ifndef __MCB_H
#define __MCB_H
#include <portable.h>
#define SEG2MCB(segm) ((segm) - 1)
#define MCB2SEG(mcb) ((mcb) + 1)
/* Don't use this constant; use SEG2MCB() or MCB2SEG() instead */
#define SEG_OFFSET 0x10
word mcb_env(const word segm);
#ifdef NDEBUG
#define mcb_env(mcb) peekw((mcb), SEG_OFFSET + 0x2c)
#endif
#include <algnbyte.h>
struct MCB {
byte mcb_type; /* type of MCB, 'Z': no following MCB, 'M': following */
word mcb_ownerPSP; /* PSP number of owner of this block */
word mcb_size; /* size of this MCB */
byte mcb_rsrvd[3]; /* unused */
byte mcb_name[8]; /* name of program file name if PSP created in exec() */
};
#include <algndflt.h>
struct SUPPL_verify_alignment_MCB {
char x[sizeof(struct MCB) == 16 ? 1 : -1];
};
/* Don't use these constant; use offsetof(struct MCB, xxx) instead */
#define MCB_OFF_TYPE 0
#define MCB_OFF_OWNER 1
#define MCB_OFF_SIZE 3
#define MCB_OFF_NAME 8
#ifdef _MICROC_
#define MCB_WALKFUNC int *
#else
typedef int (*MCB_WALKFUNC)(void *, word);
#endif
unsigned mcb_length(const word segm);
int mcb_walk(word mcb, const MCB_WALKFUNC fct, void * const arg);
int isShell(const word mcb);
int isPSP(const word mcb);
int isMCB(const word mcb);
int isEnv(const word mcb);
word nxtMCB(word mcb);
int mcb_allParents(word mcb, MCB_WALKFUNC fct, void *arg);
word mcb_primaryShell(void);
word mcb_owner(word mcb);
word mcb_shell(word mcb);
word mcb_first(void);
#endif
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