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| 型號： | 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)營理論主機(jī)接口（誘導(dǎo)因子）規(guī)格 |
| 文件頁數(shù)： | 47/118頁 |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–23
Return Value
Count
Non-ASYNC
ASYNC
NBLOCK
gr96
gr96<0
0
where
fail
n/a
fail
(NBLOCK mode is not illegal for
lseek
requests, but requests
are performed in either synchro-
nous or ASYNC mode. Return
values are interpreted accord-
ingly.)
In the Return Value table, for normal synchronous
lseek
service requests, the
return value contains the current position in the file, if the value is greater than
or equal to 0. Negative values returned in
gr96
indicate that the request was
not accepted.
The file position returned by the
lseek
service in
gr96
(
where
) is always
measured from the beginning of the file. A value of 0 refers to the beginning,
and any other positive nonzero value refers to the current position in the file.
To determine the size in bytes for a particular file, an
lseek
request with an
offset
value of 0 and an
orig
value of 2 will position the file to its end and
return the byte position of the end-of-file, which is an accurate measure of the
size of the file.
Asynchronous
lseek
requests are allowed if the operating mode for the file
descriptor associated with the request has been set to ASYNC. In this case, the
file position returned in
gr96
(
where
) will not be relevant. The
iowait
service
call should be used to determine the final file position when the seek operation
is complete.
If a previously issued
read
or
write
request is still in progress when an
lseek
is
issued, a failure status will be returned for the
lseek
request. Only one request
can be pending at a time. To properly handle this situation, the
iowait
service
should be used to ensure the completion of an outstanding
read
or
write
before
issuing the
lseek
service request.
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