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SUSPEND2.C
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C/C++ Source or Header
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1993-10-03
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18KB
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589 lines
/*--------------------------------------------------------------------*/
/* s u s p e n d 2 . c */
/* */
/* suspend/resume uupoll/uucico daemon (for OS/2) */
/* */
/* Author: Kai Uwe Rommel */
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/* Copyright (c) 1993 by Kai Uwe Rommel */
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/* Changes Copyright (c) 1989-1993 by Kendra Electronic */
/* Wonderworks. */
/* */
/* All rights reserved except those explicitly granted by */
/* the UUPC/extended license agreement. */
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/* RCS Information */
/*--------------------------------------------------------------------*/
/*
* $Id: suspend2.c 1.4 1993/10/03 20:37:34 ahd Exp $
*
* Revision history:
* $Log: suspend2.c $
* Revision 1.4 1993/10/03 20:37:34 ahd
* Further cleanup for 32 bit environment
*
* Revision 1.3 1993/09/30 03:06:28 ahd
* Move suspend signal handler into suspend2
*
* Revision 1.2 1993/09/29 04:49:20 ahd
* Various clean up, with additional messages to user
* Use unique signal handler
*
* Revision 1.1 1993/09/27 00:45:20 ahd
* Initial revision
*
*/
/*
* This modules allows suspending/resuming a running "uucico -r0"
* from another process if this other process wants to make an outgoing
* call. This can be an outgoing uucico or any other application.
* An outgoing uucico can suspend the background one itself while
* other applications such as terminal emulators will require to
* be wrapped in a batch files with calls to the uuport utility.
*
* The communication between the uuport or outgoing uucico and the
* background uucico is done via a named pipe. This has the advantage
* that it also works across a network between two machines if the
* background uucico runs on a LAN server which makes the modem shareable
* to other OS/2 machines. Then another machine first suspends the uucico
* on the server using a named pipe over the network and then requests
* the modem with a "NET USE" or equivalent operation. After using and
* disconnecting from the server's modem, it can resume the uucico on
* the server, again via network pipe.
*/
/*--------------------------------------------------------------------*/
/* Note that the 32 bit API doesn't handle signals like it's */
/* 16 bit older cousin. For now, we support the client of */
/* the of the pipe to suspend a 16 bit UUCICO, but a 32 bit */
/* UUCICO cannot be suspended. */
/*--------------------------------------------------------------------*/
/*--------------------------------------------------------------------*/
/* System include files */
/*--------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <limits.h>
#include <signal.h>
#include <process.h>
#define INCL_DOS
#define INCL_DOSPROCESS
#define INCL_ERRORS
#define INCL_DOSSIGNALS
#include <os2.h>
/*--------------------------------------------------------------------*/
/* UUPC/extended include files */
/*--------------------------------------------------------------------*/
#include "lib.h"
#include "hostable.h"
#include "security.h"
#include "dcp.h"
#include "dcpsys.h"
#include "safeio.h"
#include "modem.h"
#include "catcher.h"
#include "pos2err.h"
#include "suspend.h"
#include "usrcatch.h"
#define STACKSIZE 8192
boolean suspend_processing = FALSE;
/* This module creates a new thread. Because this thread has a stack
* segment different from the DGROUP (unlike the main thread) this
* normally requires compilation with different options. To avoid this
* (possible because the thread does not use any library routines),
* we take care not to access any local (stack) variables but only
* static global variables. There are chances that even accessing stack
* variables would work (if BP is used) but that can't be ensured.
* The same is done (to be on the safe side) for the system signal handler.
*/
static HPIPE hPipe;
static char nChar;
static char *portName;
#ifdef __OS2__
static HEV semWait, semFree;
static ULONG postCount;
static ULONG nBytes;
#else
static ULONG semWait, semFree;
static PFNSIGHANDLER old;
static USHORT nAction;
static int nBytes;
typedef USHORT APIRET ; // Define older API return type
#endif
currentfile();
#ifdef __TURBOC__
#pragma -N-
#else
#pragma check_stack( off )
#endif
#ifndef __OS2__
/*--------------------------------------------------------------------*/
/* S u s p e n d T h r e a d */
/* */
/* Accept request to release serial port */
/*--------------------------------------------------------------------*/
static VOID FAR SuspendThread(VOID)
{
/*--------------------------------------------------------------------*/
/* Process until we get a request to change the status of */
/* the port. */
/*--------------------------------------------------------------------*/
for (;;)
{
#ifdef __OS2__
if ( DosConnectNPipe(hPipe) )
break;
#else
if ( DosConnectNmPipe(hPipe) )
break;
#endif
for (;;)
{
if ( DosRead(hPipe, &nChar, 1, &nBytes) )
break; // Quit if an error
if ( nBytes == 0 )
break; /* EOF */
/*--------------------------------------------------------------------*/
/* Handle the received command character */
/*--------------------------------------------------------------------*/
switch ( nChar )
{
case 'Q': /* query */
nChar = (char) (suspend_processing ? 'S' : 'R');
DosWrite(hPipe, &nChar, 1, &nBytes);
break;
case 'S': /* suspend */
if ( suspend_processing ||
interactive_processing ||
terminate_processing )
{
nChar = 'E';
}
else {
suspend_processing = TRUE;
#ifdef __OS2__
raise(SIGUSR1);
nChar = (char) (DosWaitEventSem(&semFree, 20000) ? 'T' : 'O');
#else
DosFlagProcess(getpid(), FLGP_PID, PFLG_A, 0);
nChar = (char) (DosSemSetWait(&semFree, 20000) ? 'T' : 'O');
#endif
} /* else */
DosWrite(hPipe, &nChar, 1, &nBytes);
break;
case 'R': /* release */
if ( !suspend_processing )
nChar = 'E';
else {
suspend_processing = FALSE;
#ifdef __OS2__
DosResetEventSem( &semWait, &postCount );
#else
DosSemClear(&semWait);
#endif
nChar = 'O';
} /* else */
DosWrite(hPipe, &nChar, 1, &nBytes);
break;
default:
nChar = 'U';
DosWrite(hPipe, &nChar, 1, &nBytes);
break;
} /* switch */
} /* for (;;) */
/*-----