f777f91f4c
unstable kernel. ~83 bytes saved. git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1310 6ac86273-5f31-0410-b378-82cca8765d1b
324 lines
9.6 KiB
C
324 lines
9.6 KiB
C
/****************************************************************/
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/* */
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/* ioctl.c */
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/* */
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/* DOS-C ioctl system call */
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/* */
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/* Copyright (c) 1995,1998 */
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/* Pasquale J. Villani */
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/* All Rights Reserved */
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/* */
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/* This file is part of DOS-C. */
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/* */
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/* DOS-C is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version */
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/* 2, or (at your option) any later version. */
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/* */
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/* DOS-C is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public */
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/* License along with DOS-C; see the file COPYING. If not, */
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/* write to the Free Software Foundation, 675 Mass Ave, */
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/* Cambridge, MA 02139, USA. */
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/****************************************************************/
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#include "portab.h"
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#include "globals.h"
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#ifdef VERSION_STRINGS
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static BYTE *RcsId =
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"$Id$";
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#endif
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/*
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* WARNING: this code is non-portable (8086 specific).
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*/
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/* TE 10/29/01
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although device drivers have only 20 pushes available for them,
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MS NET plays by its own rules
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at least TE's network card driver DM9PCI (some 10$ NE2000 clone) does:
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with SP=8DC before calling down to execrh, and SP=8CC when
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callf [interrupt], DM9PCI touches DOSDS:792,
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14 bytes into error stack :-(((
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so some optimizations were made.
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this uses the fact, that only CharReq device buffer is ever used.
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fortunately, this saves some code as well :-)
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*/
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COUNT DosDevIOctl(lregs * r)
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{
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static UBYTE cmd [] = {
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0, 0,
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/* 0x02 */ C_IOCTLIN,
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/* 0x03 */ C_IOCTLOUT,
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/* 0x04 */ C_IOCTLIN,
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/* 0x05 */ C_IOCTLOUT,
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/* 0x06 */ C_ISTAT,
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/* 0x07 */ C_OSTAT,
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/* 0x08 */ C_REMMEDIA,
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0, 0, 0,
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/* 0x0c */ C_GENIOCTL,
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/* 0x0d */ C_GENIOCTL,
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/* 0x0e */ C_GETLDEV,
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/* 0x0f */ C_SETLDEV,
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/* 0x10 */ C_IOCTLQRY,
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/* 0x11 */ C_IOCTLQRY,
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};
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sft FAR *s;
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struct dpb FAR *dpbp;
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unsigned attr;
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unsigned char al = r->AL;
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if (al > 0x11)
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return DE_INVLDFUNC;
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/* commonly used, shouldn't harm to do front up */
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CharReqHdr.r_command = cmd[r->AL];
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if (al == 0x0C || al == 0x0D || al >= 0x10) /* generic or query */
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{
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CharReqHdr.r_cat = r->CH; /* category (major) code */
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CharReqHdr.r_fun = r->CL; /* function (minor) code */
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CharReqHdr.r_io = MK_FP(r->DS, r->DX); /* parameter block */
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}
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else
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{
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CharReqHdr.r_count = r->CX;
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CharReqHdr.r_trans = MK_FP(r->DS, r->DX);
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}
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CharReqHdr.r_length = sizeof(request);
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CharReqHdr.r_status = 0;
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switch (r->AL)
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{
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case 0x0b:
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/* skip, it's a special case. */
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NetDelay = r->CX;
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if (r->DX)
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NetRetry = r->DX;
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break;
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case 0x00:
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case 0x01:
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case 0x02:
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case 0x03:
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case 0x06:
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case 0x07:
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case 0x0a:
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case 0x0c:
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case 0x10:
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{
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unsigned flags;
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/* Test that the handle is valid and */
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/* get the SFT block that contains the SFT */
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if ((s = get_sft(r->BX)) == (sft FAR *) - 1)
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return DE_INVLDHNDL;
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attr = s->sft_dev->dh_attr;
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flags = s->sft_flags;
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switch (r->AL)
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{
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case 0x00:
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/* Get the flags from the SFT */
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if (flags & SFT_FDEVICE)
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r->AX = (attr & 0xff00) | (flags & 0xff);
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else
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r->AX = flags;
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/* Undocumented result, Ax = Dx seen using Pcwatch */
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r->DX = r->AX;
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break;
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case 0x01:
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/* sft_flags is a file, return an error because you */
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/* can't set the status of a file. */
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if (!(flags & SFT_FDEVICE))
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return DE_INVLDFUNC;
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/* RBIL says this is only for DOS < 6, but MSDOS 7.10 */
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/* returns this as well... and some buggy program relies*/
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/* on it :( */
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if (r->DH != 0)
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return DE_INVLDDATA;
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/* Undocumented: AL should get the old value */
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r->AL = s->sft_flags_lo;
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/* Set it to what we got in the DL register from the */
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/* user. */
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s->sft_flags_lo = SFT_FDEVICE | r->DL;
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break;
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case 0x0a:
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r->DX = flags;
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r->AX = 0;
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break;
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case 0x06:
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if (!(flags & SFT_FDEVICE))
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{
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r->AL = s->sft_posit >= s->sft_size ? 0 : 0xFF;
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break;
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}
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goto IoCharCommon;
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case 0x07:
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if (!(flags & SFT_FDEVICE))
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{
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r->AL = 0;
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break;
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}
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/* fall through */
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default: /* 0x02, 0x03, 0x0c, 0x10 */
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IoCharCommon:
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if ((flags & SFT_FDEVICE) &&
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( (r->AL <= 0x03 && (attr & ATTR_IOCTL))
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|| r->AL == 0x06 || r->AL == 0x07
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|| (r->AL == 0x10 && (attr & ATTR_QRYIOCTL))
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|| (r->AL == 0x0c && (attr & ATTR_GENIOCTL))))
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{
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CharReqHdr.r_unit = 0;
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execrh((request FAR *) & CharReqHdr, s->sft_dev);
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if (CharReqHdr.r_status & S_ERROR)
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{
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CritErrCode = (CharReqHdr.r_status & S_MASK) + 0x13;
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return DE_DEVICE;
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}
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if (r->AL <= 0x03)
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r->AX = CharReqHdr.r_count;
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else if (r->AL <= 0x07)
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r->AX = CharReqHdr.r_status & S_BUSY ? 0000 : 0x00ff;
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else /* 0x0c or 0x10 */
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r->AX = CharReqHdr.r_status;
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break;
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}
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return DE_INVLDFUNC;
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}
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break;
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}
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default: /* block IOCTL: 4, 5, 8, 9, d, e, f, 11 */
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/*
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This line previously returned the deviceheader at r->bl. But,
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DOS numbers its drives starting at 1, not 0. A=1, B=2, and so
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on. Changed this line so it is now zero-based.
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-SRM
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*/
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/* JPP - changed to use default drive if drive=0 */
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/* JT Fixed it */
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#define NDN_HACK
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/* NDN feeds the actual ASCII drive letter to this function */
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#ifdef NDN_HACK
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CharReqHdr.r_unit = ((r->BL & 0x1f) == 0 ? default_drive :
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(r->BL & 0x1f) - 1);
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#else
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CharReqHdr.r_unit = (r->BL == 0 ? default_drive : r->BL - 1);
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#endif
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dpbp = get_dpb(CharReqHdr.r_unit);
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if (dpbp)
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{
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attr = dpbp->dpb_device->dh_attr;
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CharReqHdr.r_unit = dpbp->dpb_subunit;
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}
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else if (r->AL != 9)
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return DE_INVLDDRV;
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switch (r->AL)
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{
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case 0x09:
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{
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struct cds FAR *cdsp = get_cds(CharReqHdr.r_unit);
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r->AX = S_DONE | S_BUSY;
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if (cdsp != NULL && dpbp == NULL)
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{
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r->DX = ATTR_REMOTE;
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}
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else
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{
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if (!dpbp)
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{
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return DE_INVLDDRV;
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}
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r->DX = attr;
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}
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if (cdsp->cdsFlags & CDSSUBST)
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{
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r->DX |= ATTR_SUBST;
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}
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break;
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}
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case 0x08:
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if (!(attr & ATTR_EXCALLS))
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return DE_INVLDFUNC;
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/* else fall through */
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case 0x04:
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case 0x05:
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case 0x0d:
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case 0x11:
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if (r->AL == 0x0D && (r->CX & ~(0x486B-0x084A)) == 0x084A)
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{ /* 084A/484A, 084B/484B, 086A/486A, 086B/486B */
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r->AX = 0; /* (lock/unlock logical/physical volume) */
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break; /* simulate success for MS-DOS 7+ SCANDISK etc. --LG */
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}
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if ((r->AL <= 0x05 && !(attr & ATTR_IOCTL))
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|| (r->AL == 0x11 && !(attr & ATTR_QRYIOCTL))
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|| (r->AL == 0x0d && !(attr & ATTR_GENIOCTL)))
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{
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return DE_INVLDFUNC;
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}
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execrh((request FAR *) & CharReqHdr, dpbp->dpb_device);
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if (CharReqHdr.r_status & S_ERROR)
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{
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CritErrCode = (CharReqHdr.r_status & S_MASK) + 0x13;
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return DE_DEVICE;
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}
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if (r->AL <= 0x05)
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r->AX = CharReqHdr.r_count;
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else if (r->AL == 0x08)
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r->AX = (CharReqHdr.r_status & S_BUSY) ? 1 : 0;
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else /* 0x0d or 0x11 */
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r->AX = CharReqHdr.r_status;
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break;
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default: /* 0x0e, 0x0f */
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if (attr & ATTR_GENIOCTL)
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{
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execrh((request FAR *) & CharReqHdr, dpbp->dpb_device);
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if (CharReqHdr.r_status & S_ERROR)
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{
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CritErrCode = (CharReqHdr.r_status & S_MASK) + 0x13;
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return DE_ACCESS;
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}
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else
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{
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r->AL = CharReqHdr.r_unit;
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return SUCCESS;
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}
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}
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return DE_INVLDFUNC;
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}
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break;
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}
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return SUCCESS;
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}
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