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Query_Serial.c
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C/C++ Source or Header
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1992-09-03
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4KB
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137 lines
/*
* Copyright (c) 1992 Commodore-Amiga, Inc.
*
* This example is provided in electronic form by Commodore-Amiga, Inc. for
* use with the "Amiga ROM Kernel Reference Manual: Devices", 3rd Edition,
* published by Addison-Wesley (ISBN 0-201-56775-X).
*
* The "Amiga ROM Kernel Reference Manual: Devices" contains additional
* information on the correct usage of the techniques and operating system
* functions presented in these examples. The source and executable code
* of these examples may only be distributed in free electronic form, via
* bulletin board or as part of a fully non-commercial and freely
* redistributable diskette. Both the source and executable code (including
* comments) must be included, without modification, in any copy. This
* example may not be published in printed form or distributed with any
* commercial product. However, the programming techniques and support
* routines set forth in these examples may be used in the development
* of original executable software products for Commodore Amiga computers.
*
* All other rights reserved.
*
* This example is provided "as-is" and is subject to change; no
* warranties are made. All use is at your own risk. No liability or
* responsibility is assumed.
*
*****************************************************************************
*
*
* Query_Serial.c
*
* We will try to open the serial device and if unsuccessful,
* will return the name of the owner.
*
* Compile with SAS C 5.10 lc -b1 -cfistq -v -y -L
*
* Run from CLI only
*/
#include <exec/types.h>
#include <exec/memory.h>
#include <dos/dos.h>
#include <resources/misc.h>
#include <devices/serial.h>
#include <clib/exec_protos.h>
#include <clib/alib_protos.h>
#include <clib/dos_protos.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef LATTICE
#include <clib/misc_protos.h>
#include <stdio.h>
int CXBRK(void) { return(0); } /* Disable SAS CTRL-C handling */
void main(void);
#endif
#define UNIT_NUMBER 0
struct Library *MiscBase;
/* our functions */
void cleanexit(UBYTE *,LONG);
void cleanup(void);
struct MsgPort *SerialMP; /* Message port pointer */
struct IOExtSer *SerialIO; /* IORequest pointer */
void main()
{
UWORD status; /* return value of SDCMD_QUERY */
UBYTE *user; /* name of serial port owner if not us */
if (SerialMP=CreatePort(NULL,NULL) )
{
if (SerialIO=(struct IOExtSer *)
CreateExtIO(SerialMP,sizeof(struct IOExtSer)) )
{
if (OpenDevice(SERIALNAME,UNIT_NUMBER,(struct IORequest *)SerialIO,0))
{
printf("\n%s did not open",SERIALNAME);
MiscBase= (struct Library *)OpenResource(MISCNAME);
/* Find out who has the serial device */
if ((user = AllocMiscResource(MR_SERIALPORT,"Us")) == NULL)
{
printf("\n");
FreeMiscResource(MR_SERIALPORT);
}
else
printf(" because %s owns it \n\n",user);
/* Clean up */
cleanup();
}
else
{
SerialIO->IOSer.io_Command = SDCMD_QUERY;
SendIO((struct IORequest *)SerialIO); /* execute query */
status = SerialIO->io_Status; /* store returned status */
printf("\tThe serial port status is %x\n",status);
AbortIO((struct IORequest *)SerialIO);
WaitIO((struct IORequest *)SerialIO);
CloseDevice((struct IORequest *)SerialIO);
cleanup();
}
}
else
cleanexit("Can't create IORequest\n",RETURN_FAIL);
}
else
cleanexit("Can't create message port\n",RETURN_FAIL);
}
void cleanexit(UBYTE *s,LONG n)
{
if (*s)
printf(s);
cleanup();
exit(n);
}
void cleanup()
{
if (SerialIO)
DeleteExtIO(SerialIO);
if (SerialMP)
DeletePort(SerialMP);
}