CDA CD 60 Especificações descarregar pdf (Página 19)

PCI CD and PCI CDa

Document Number: 008-00965-06 EDT Public Revision: I December 2004

Template: edt.dot

Page 19

edt_parse_unit

Description

Parses an EDT device name string. Fills in the name of the device, with the default_device if specified,

or a default determined by the package, and returns a unit number. Designed to facilitate a flexible

device/unit command line argument scheme for application programs. Most EDT example/utility

programs use this susubroutine to allow users to specify either a unit number alone or a device/unit

number concatenation.

For example, if you are using a PCI CD, then either xtest -u 0 or xtest -u pcd0 could both be used, since

xtest sends the argument to edt_parse_unit, and the subroutine parses the string to returns the device

and unit number separately.

Syntax

int edt_parse_unit(char *str, char *dev, char *default_dev)

Arguments

str

device name string. Should be either a unit number (“0” - “8”) or device/unit

concantenation (“pcd0,” “pcd1,” etc.)

dev

device string, filled in by the routine. For example, “pcd.”

default_dev

device name to use if none is given in the str argument. If NULL, will be filled in

by the default device for the package in use. For example, if the code base is from a

PCI CD package, the default_dev will be set to “pcd.”

Return

Unit number or -1 on error. The first device is unit 0.

See Also

example/utility programs xtest.c, initcam.c, take.c

edt_read

Description

Performs a read on the EDT Product. For those on UNIX systems, the UNIX 2 GB file offset bug is

avoided during large amounts of input or output, that is, reading past 231 bytes does not fail. This call

is not multibuffering, and no transfer is active when it completes.

Syntax

#include "edtinc.h"

int edt_read(EdtDev *edt_p, void *buf, int size);

Arguments

edt_p

device handle returned from edt_open or edt_open_channel

buf

address of buffer to read into

size

size of read in bytes

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