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Almathera Ten Pack 3: CDPD 3
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createextio.c
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C/C++ Source or Header
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1995-03-17
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4KB
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147 lines
/*
*
* DISCLAIMER:
*
* This program is provided as a service to the programmer
* community to demonstrate one or more features of the Amiga
* personal computer. These code samples may be freely used
* for commercial or noncommercial purposes.
*
* Commodore Electronics, Ltd ("Commodore") makes no
* warranties, either expressed or implied, with respect
* to the program described herein, its quality, performance,
* merchantability, or fitness for any particular purpose.
* This program is provided "as is" and the entire risk
* as to its quality and performance is with the user.
* Should the program prove defective following its
* purchase, the user (and not the creator of the program,
* Commodore, their distributors or their retailers)
* assumes the entire cost of all necessary damages. In
* no event will Commodore be liable for direct, indirect,
* incidental or consequential damages resulting from any
* defect in the program even if it has been advised of the
* possibility of such damages. Some laws do not allow
* the exclusion or limitation of implied warranties or
* liabilities for incidental or consequential damages,
* so the above limitation or exclusion may not apply.
*
*/
/***********************************************************************
*
* Exec Support Function -- Extended IO Request
*
***********************************************************************/
#include "exec/types.h"
#include "exec/nodes.h"
#include "exec/lists.h"
#include "exec/memory.h"
#include "exec/interrupts.h"
#include "exec/ports.h"
#include "exec/libraries.h"
#include "exec/io.h"
#include "exec/tasks.h"
#include "exec/execbase.h"
extern APTR AllocMem();
/****** exec_support/CreateExtIO **************************************
*
* NAME
* CreateExtIO() -- create an Extended IO request
*
* SYNOPSIS
* ioReq = CreateExtIO(ioReplyPort,size);
*
* FUNCTION
* Allocates memory for and initializes a new IO request block
* of a user-specified number of bytes.
*
* INPUTS
* ioReplyPort - a pointer to an already initialized
* message port to be used for this IO request's reply port.
*
* RESULT
* Returns a pointer to the new block. Pointer is of the type
* struct IORequest.
*
* 0 indicates inability to allocate enough memory for the request block
* or not enough signals available.
*
* EXAMPLE
* struct IORequest *myBlock;
* if( (myBlock = CreateExtIO(myPort,sizeof(struct IOExtTD)) == NULL)
* exit(NO_MEM_OR_SIGNALS);
*
* example used to allocate space for IOExtTD (trackdisk driver
* IO Request block for extended IO operations).
*
* SEE ALSO
* DeleteExtIO
*
***********************************************************************/
struct IORequest *CreateExtIO(ioReplyPort,size)
struct MsgPort *ioReplyPort;
LONG size;
{
struct IORequest *ioReq;
if (ioReplyPort == 0)
return ((struct IORequest *) 0);
ioReq = AllocMem (size, MEMF_CLEAR | MEMF_PUBLIC);
if (ioReq == 0)
return ((struct IORequest *) 0);
ioReq -> io_Message.mn_Node.ln_Type = NT_MESSAGE;
ioReq -> io_Message.mn_Node.ln_Pri = 0;
ioReq -> io_Message.mn_ReplyPort = ioReplyPort;
return (ioReq);
}
/****** exec_support/DeleteExtIO **************************************
*
* NAME
* DeleteExtIO() - return memory allocated for extended IO request
*
* SYNOPSIS
* DeleteExtIO(ioReq,size);
*
* FUNCTION
* See summary line at NAME. Also frees the signal bit which
* had been allocated by the call to CreateExtIO.
*
* INPUTS
* A pointer to the IORequest block whose resources are to be freed.
*
* RESULT
* Frees the memory. Returns (no error conditions shown)
*
* EXAMPLE
* struct IORequest *myBlock;
* DeleteExtIO(myBlock,(sizeof(struct IOExtTD)));
*
* example shows that CreateExtIO had been used to create a trackdisk
* (extended) IO Request block.
*
* SEE ALSO
* CreateExtIO
*
**************************************************************************/
DeleteExtIO(ioExt,size)
struct IORequest *ioExt;
LONG size;
{
ioExt -> io_Message.mn_Node.ln_Type = 0xff;
ioExt -> io_Device = (struct Device *) -1;
ioExt -> io_Unit = (struct Unit *) -1;
FreeMem (ioExt, size);
}