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B_SPAWN.C
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C/C++ Source or Header
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1991-09-15
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14KB
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442 lines
/*--------------------------------------------------------------------------*/
/* */
/* */
/* ------------ Bit-Bucket Software, Co. */
/* \ 10001101 / Writers and Distributors of */
/* \ 011110 / Freely Available<tm> Software. */
/* \ 1011 / */
/* ------ */
/* */
/* (C) Copyright 1987-91, Bit Bucket Software Co., a Delaware Corporation. */
/* */
/* */
/* This module was originally written by Bob Hartman */
/* */
/* */
/* BinkleyTerm "Spawn" module */
/* */
/* */
/* For complete details of the licensing restrictions, please refer */
/* to the License agreement, which is published in its entirety in */
/* the MAKEFILE and BT.C, and also contained in the file LICENSE.250. */
/* */
/* USE OF THIS FILE IS SUBJECT TO THE RESTRICTIONS CONTAINED IN THE */
/* BINKLEYTERM LICENSING AGREEMENT. IF YOU DO NOT FIND THE TEXT OF */
/* THIS AGREEMENT IN ANY OF THE AFOREMENTIONED FILES, OR IF YOU DO */
/* NOT HAVE THESE FILES, YOU SHOULD IMMEDIATELY CONTACT BIT BUCKET */
/* SOFTWARE CO. AT ONE OF THE ADDRESSES LISTED BELOW. IN NO EVENT */
/* SHOULD YOU PROCEED TO USE THIS FILE WITHOUT HAVING ACCEPTED THE */
/* TERMS OF THE BINKLEYTERM LICENSING AGREEMENT, OR SUCH OTHER */
/* AGREEMENT AS YOU ARE ABLE TO REACH WITH BIT BUCKET SOFTWARE, CO. */
/* */
/* */
/* You can contact Bit Bucket Software Co. at any one of the following */
/* addresses: */
/* */
/* Bit Bucket Software Co. FidoNet 1:104/501, 1:343/491 */
/* P.O. Box 460398 AlterNet 7:491/0 */
/* Aurora, CO 80046 BBS-Net 86:2030/1 */
/* Internet f491.n343.z1.fidonet.org */
/* */
/* Please feel free to contact us at any time to share your comments about */
/* our software and/or licensing policies. */
/* */
/*--------------------------------------------------------------------------*/
/* Include this file before any other includes or defines! */
#include "includes.h"
#ifndef OS_2
/*
We now use Thomas Wagner's EXEC module to do our swapping.
There's probably no good reason why we can't just hack our
code to work with his as distributed. We'll put that on the
wishlist. For now, we hacked his and you'll find the
appropriate excerpts below.
EXEC.H: EXEC function with memory swap - Main function header file.
Public domain software by
Thomas Wagner
Ferrari electronic GmbH
Beusselstrasse 27
D-1000 Berlin 21
Germany
*/
extern int do_exec (char *xfn, char *pars, int spawn, unsigned needed,
char **envp);
/*
The EXEC function.
Parameters:
xfn is a string containing the name of the file
to be executed.
pars The program parameters.
spawn If 0, the function will terminate after the
EXECed program returns, the function will not return.
NOTE: If the program file is not found, the function
will always return with the appropriate error
code, even if 'spawn' is 0.
If non-0, the function will return after executing the
program. If necessary (see the "needed" parameter),
memory will be swapped out before executing the program.
For swapping, spawn must contain a combination of the
following flags:
USE_EMS (0x01) - allow EMS swap
USE_XMS (0x02) - allow XMS swap
USE_FILE (0x04) - allow File swap
The order of trying the different swap methods can be
controlled with one of the flags
EMS_FIRST (0x00) - EMS, XMS, File (default)
XMS_FIRST (0x10) - XMS, EMS, File
If swapping is to File, the attribute of the swap file
can be set to "hidden", so users are not irritated by
strange files appearing out of nowhere with the flag
HIDE_FILE (0x40) - create swap file as hidden
and the behaviour on Network drives can be changed with
NO_PREALLOC (0x100) - don't preallocate
CHECK_NET (0x200) - don't preallocate if file on net.
This checking for Network is mainly to compensate for
a strange slowdown on Novell networks when preallocating
a file. You can either set NO_PREALLOC to avoid allocation
in any case, or let the prep_swap routine decide whether
to do preallocation or not depending on the file being
on a network drive (this will only work with DOS 3.1 or
later).
needed The memory needed for the program in paragraphs (16 Bytes).
If not enough memory is free, the program will
be swapped out.
Use 0 to never swap, 0xffff to always swap.
If 'spawn' is 0, this parameter is irrelevant.
envp The environment to be passed to the spawned
program. If this parameter is NULL, a copy
of the parent's environment is used (i.e.
'putenv' calls have no effect). If non-NULL,
envp must point to an array of pointers to
strings, terminated by a NULL pointer (the
standard variable 'environ' may be used).
Return value:
0x0000..00FF: The EXECed Program's return code
0x0101: Error preparing for swap: no space for swapping
0x0102: Error preparing for swap: program too low in memory
0x0200: Program file not found
0x03xx: DOS-error-code xx calling EXEC
0x0400: Error allocating environment buffer
0x0500: Swapping requested, but prep_swap has not
been called or returned an error.
0x0501: MCBs don't match expected setup
0x0502: Error while swapping out
*/
/* Return codes (only upper byte significant) */
#define RC_PREPERR 0x0100
#define RC_NOFILE 0x0200
#define RC_EXECERR 0x0300
#define RC_ENVERR 0x0400
#define RC_SWAPERR 0x0500
/* Swap method and option flags */
#define USE_EMS 0x01
#