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| 型號(hào)： | HIF_SPEC |
| 英文描述： | EZ-030 Demonstration Board Theory of Operation Host Interface (HIF) Specification |
| 中文描述： | 易- 030演示板的經(jīng)營(yíng)理論主機(jī)接口（誘導(dǎo)因子）規(guī)格 |
| 文件頁(yè)數(shù)： | 40/118頁(yè) |
| 文件大小： | 356K |
| 代理商： | HIF_SPEC |
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3–16
Host Interface (HIF) Specification
40
Service 19 – read
Read a Buffer of Data from a File
Description
This service reads a number of bytes from a previously opened file (identified
by a small integer file descriptor in
lr2
that was returned by the
open
service)
into memory starting at the address given by the buffer pointer in
lr3
.
lr4
contains the number of bytes to be read. The number of bytes actually read is
returned in
gr96
. Zero is returned in
gr96
if the file is already positioned at its
end-of-file. If an error is detected, a small positive integer is returned in
gr121
,
indicating the nature of the error.
Register Usage
Type
Regs
Contents
Description
Calling:
gr121
19 (0x13)
Service number
lr2
fileno
File descriptor
lr3
buffptr
A pointer to buffer area
lr4
nbytes
Number of bytes to be read
Returns:
gr96
count*
*See
Return Value
table, below.
gr121
0x80000000
errcode
Logical TRUE, service successful
Error number, service not successful
(implementation dependent)
The value returned in register
gr96
can be interpreted differently, depending on
the current operating mode of the file identified by the
fileno
parameter. The
operating mode is established or changed by invoking the
ioctl
service (24).
The Return Value table shows how the return value in
gr96
should be
interpreted for various operating modes.
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