?? task.c
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/****************************************************************/
/* */
/* task.c */
/* */
/* Task Manager for DOS Processes */
/* */
/* Copyright (c) 1995 */
/* Pasquale J. Villani */
/* All Rights Reserved */
/* */
/* This file is part of DOS-C. */
/* */
/* DOS-C is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU General Public License */
/* as published by the Free Software Foundation; either version */
/* 2, or (at your option) any later version. */
/* */
/* DOS-C 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 General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public */
/* License along with DOS-C; see the file COPYING. If not, */
/* write to the Free Software Foundation, 675 Mass Ave, */
/* Cambridge, MA 02139, USA. */
/****************************************************************/
#include "../../hdr/portab.h"
#include "globals.h"
/* $Logfile: C:/dos-c/src/kernel/task.c_v $ */
#ifdef VERSION_STRINGS
static BYTE *RcsId = "$Header: C:/dos-c/src/kernel/task.c_v 1.14 07 Feb 1998 20:38:32 patv $";
#endif
/* $Log: C:/dos-c/src/kernel/task.c_v $
*
* Rev 1.14 07 Feb 1998 20:38:32 patv
* Modified stack fram to match DOS standard
*
* Rev 1.13 31 Jan 1998 14:39:20 patv
* Corrected type in load high code.
*
* Rev 1.12 31 Jan 1998 14:02:52 patv
* Added load high in memory option in DosExeLoader.
*
* Rev 1.11 22 Jan 1998 22:17:14 patv
* Eliminated warnings.
*
* Rev 1.10 22 Jan 1998 21:31:36 patv
* Corrected short .COM problem.
*
* Rev 1.9 04 Jan 1998 23:15:16 patv
* Changed Log for strip utility
*
* Rev 1.8 22 Jan 1997 13:18:14 patv
* pre-0.92 Svante Frey bug fixes.
*
* Rev 1.7 16 Jan 1997 12:46:56 patv
* pre-Release 0.92 feature additions
*
* Rev 1.5 29 Aug 1996 13:07:22 patv
* Bug fixes for v0.91b
*
* Rev 1.4 29 May 1996 21:03:36 patv
* bug fixes for v0.91a
*
* Rev 1.3 19 Feb 1996 3:21:48 patv
* Added NLS, int2f and config.sys processing
*
* Rev 1.2 01 Sep 1995 17:54:22 patv
* First GPL release.
*
* Rev 1.1 30 Jul 1995 20:51:58 patv
* Eliminated version strings in ipl
*
* Rev 1.0 02 Jul 1995 8:34:06 patv
* Initial revision.
*/
/* $EndLog$ */
#define LOADNGO 0
#define LOAD 1
#define OVERLAY 3
static exe_header header;
#define CHUNK 16384
#define MAXENV 32768
#ifndef PROTO
COUNT ChildEnv(exec_blk FAR *, UWORD *, char far *);
#else
COUNT ChildEnv();
#endif
#ifndef IPL
COUNT
ChildEnv (exec_blk FAR *exp, UWORD *pChildEnvSeg, char far *pathname)
{
BYTE FAR *pSrc;
BYTE FAR *pDest;
UWORD nEnvSize;
COUNT RetCode;
UWORD MaxEnvSize;
psp FAR *ppsp = MK_FP( cu_psp, 0);
/* create a new environment for the process */
/* copy parent's environment if exec.env_seg == 0 */
pSrc = exp -> exec.env_seg ?
MK_FP(exp -> exec.env_seg, 0) :
MK_FP(ppsp -> ps_environ, 0);
if (!pSrc) /* no environment to copy */
{
*pChildEnvSeg = 0;
return SUCCESS;
}
for(nEnvSize = 0; *pSrc != '\0'; )
while(*pSrc != '\0')
{
++pSrc;
++nEnvSize;
}
/* account for terminating null */
++nEnvSize;
++pSrc;
}
/* Test env size and abort if greater than max */
if(nEnvSize >= MAXENV)
return DE_INVLDENV;
/* allocate enough space for env + path */
if((RetCode = DosMemAlloc(long2para(nEnvSize + 65),
FIRST_FIT, (seg FAR *)pChildEnvSeg,
(UWORD FAR *)MaxEnvSize)) < 0)
return RetCode;
else
pDest = MK_FP(*pChildEnvSeg + 1, 0);
/* fill the new env and inform the process of its */
/* location throught the psp */
pSrc = exp -> exec.env_seg ?
MK_FP(exp -> exec.env_seg, 0) :
MK_FP(ppsp -> ps_environ, 0);
/* copy the environment */
for( ; *pSrc != '\0'; )
{
while (*pSrc)
{
*pDest++ = *pSrc++;
}
pSrc++;
*pDest++ = 0;
}
*pDest++ = 0;
/* initialize 'extra strings' count */
*pDest++ = 1;
*pDest++ = 0;
/* copy complete pathname */
truename(pathname, pDest);
return SUCCESS;
}
#endif
/* The following code is 8086 dependant */
VOID
new_psp (psp FAR *p, int psize)
{
REG COUNT i;
BYTE FAR *lpPspBuffer;
psp FAR *q = MK_FP(cu_psp, 0);
/* Clear out new psp first */
for(lpPspBuffer = (BYTE FAR *)p, i = 0; i < sizeof(psp) ; ++i)
*lpPspBuffer = 0;
/* initialize all entries and exits */
/* CP/M-like exit point */
p -> ps_exit = 0x20cd;
/* CP/M-like entry point - jump to special entry */
p -> ps_farcall= 0xea;
#ifndef IPL
p -> ps_reentry = cpm_entry;
#endif
/* unix style call - 0xcd 0x21 0xcb (int 21, retf) */
p -> ps_unix[0] = 0xcd;
p -> ps_unix[1] = 0x21;
p -> ps_unix[2] = 0xcb;
/* Now for parent-child relationships */
/* parent psp segment */
p -> ps_parent = cu_psp;
/* previous psp pointer */
p -> ps_prevpsp = q;
#ifndef IPL
/* Environment and memory useage parameters */
/* memory size in paragraphs */
p -> ps_size = psize;
/* environment paragraph */
p -> ps_environ = 0;
/* process dta */
p -> ps_dta = (BYTE FAR *)(&p -> ps_cmd_count);
/* terminate address */
p -> ps_isv22 = (VOID(interrupt FAR *)(void))getvec(0x22);
/* break address */
p -> ps_isv23 = (VOID(interrupt FAR *)(void))getvec(0x23);
/* critical error address */
p -> ps_isv24 = (VOID(interrupt FAR *)(void))getvec(0x24);
#endif
/* File System parameters */
/* user stack pointer - int 21 */
p -> ps_stack = (BYTE FAR *)-1;
/* file table - 0xff is unused */
for(i = 0; i < 20; i++)
p -> ps_files[i] = 0xff;
/* maximum open files */
p -> ps_maxfiles = 20;
/* open file table pointer */
p -> ps_filetab = p -> ps_files;
#ifndef IPL
/* clone the file table */
if(InDOS > 0)
{
REG COUNT i;
for(i = 0; i < 20; i++)
{
REG COUNT ret;
if(q -> ps_filetab[i] != 0xff
&& ((ret = CloneHandle(q -> ps_filetab[i])) >= 0))
{
p -> ps_filetab[i] = ret;
}
else
p -> ps_filetab[i] = 0xff;
}
}
else
{
/* initialize stdin, stdout, etc */
p -> ps_files[STDIN] = 0; /* stdin */
p -> ps_files[STDOUT] = 1; /* stdout */
p -> ps_files[STDERR] = 2; /* stderr */
p -> ps_files[STDAUX] = 3; /* stdaux */
p -> ps_files[STDPRN] = 4; /* stdprn */
}
#else
/* initialize stdin, stdout, etc */
p -> ps_files[STDIN] = 0; /* stdin */
p -> ps_files[STDOUT] = 1; /* stdout */
p -> ps_files[STDERR] = 2; /* stderr */
p -> ps_files[STDAUX] = 3; /* stdaux */
p -> ps_files[STDPRN] = 4; /* stdprn */
#endif
/* first command line argument */
p -> ps_fcb1.fcb_drive = 0;
/* second command line argument */
p -> ps_fcb2.fcb_drive = 0;
/* local command line */
p -> ps_cmd_count = 0; /* command tail */
p -> ps_cmd[0] = 0; /* command tail */
}
#ifndef IPL
static COUNT
DosComLoader (BYTE FAR *namep, exec_blk FAR *exp, COUNT mode)
{
COUNT rc, env_size, nread;
UWORD mem;
UWORD env, asize;
BYTE FAR *sp, FAR *dp;
psp FAR *p;
psp FAR *q = MK_FP(cu_psp, 0);
mcb FAR *mp, FAR *envp = 0;
iregs FAR *irp;
LONG com_size;
if(mode != OVERLAY)
{
if((rc = ChildEnv(exp, &env, namep)) != SUCCESS)
{
return rc;
}
/* Allocate our memory and pass back any errors */
if((rc = DosMemAlloc(0, LARGEST, (seg FAR *)&mem, (UWORD FAR *)&asize)) < 0)
{
if(env != 0)
DosMemFree(env);
return rc;
}
mp = MK_FP(mem, 0);
++mem;
envp = MK_FP(env, 0);
}
else mem = exp -> load.load_seg;
/* Now load the executable */
/* If file not found - error */
/* NOTE - this is fatal because we lost it in transit */
/* from DosExec! */
if((rc = dos_open(namep, 0)) < 0)
fatal("(DosComLoader) com file lost in transit");
/* do it in 32K chunks */
sp = MK_FP(mem, mode == OVERLAY? 0 : sizeof(psp));
for(com_size = dos_getfsize(rc), nread = 0; com_size > 0; )
{
nread = dos_read(rc, sp, CHUNK);
sp = add_far((VOID FAR *)sp, (ULONG)nread);
com_size -= nread;
if(nread < CHUNK)
break;
}
dos_close(rc);
if(mode == OVERLAY)
return SUCCESS;
/* point to the PSP so we can build it */
p = MK_FP(mem, 0);
setvec(0x22, (VOID (INRPT FAR *)(VOID))MK_FP(user_r -> CS, user_r -> IP));
new_psp(p, mem + asize);
p -> ps_environ = env == 0 ? 0 : env + 1;
/* complete the psp by adding the command line */
p -> ps_cmd_count = exp -> exec.cmd_line -> ctCount;
fbcopy(exp -> exec.cmd_line -> ctBuffer, p -> ps_cmd, 127);
#if 0
/* stick a new line on the end for safe measure */
p -> ps_cmd[p -> ps_cmd_count] = '\r';
#endif
/* identify the mcb as this functions' */
/* use the file name less extension - left adjusted and */
/* space filled */
mp -> m_psp = mem;
if (envp) envp -> m_psp = mem;
for(asize = 0; asize < 8; asize++)
{
if(namep[asize] != '.')
mp -> m_name[asize] = namep[asize];
else
break;
}
for(; asize < 8; asize++)
mp -> m_name[asize] = ' ';
/* build the user area on the stack */
irp = MK_FP(mem, (0xfffe - sizeof(iregs)));
/* start allocating REGs */
irp -> ES = irp -> DS = mem;
irp -> CS = mem;
irp -> IP = 0x100;
irp -> AX = 0xffff; /* for now, until fcb code is in */
irp -> BX =
irp -> CX =
irp -> DX =
irp -> SI =
irp -> DI =
irp -> BP = 0;
irp -> FLAGS = 0x200;
/* Transfer control to the executable */
p -> ps_parent = cu_psp;
p -> ps_prevpsp = (BYTE FAR *)MK_FP(cu_psp, 0);
q -> ps_stack = (BYTE FAR *)user_r;
user_r -> FLAGS &= ~FLG_CARRY;
switch(mode)
{
case LOADNGO:
{
cu_psp = mem;
dta = p -> ps_dta;
if (InDOS)
--InDOS;
exec_user(irp);
/* We should never be here */
fatal("KERNEL RETURNED!!!");
break;
}
case LOAD:
cu_psp = mem;
exp -> exec.stack = (BYTE FAR *)irp;
exp -> exec.start_addr = MK_FP(irp -> CS, irp -> IP);
return SUCCESS;
}
return DE_INVLDFMT;
}
VOID
return_user (void)
{
psp FAR *p, FAR *q;
REG COUNT i;
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