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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)營理論主機接口（誘導(dǎo)因子）規(guī)格 |
| 文件頁數(shù)： | 57/118頁 |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–33
Return Value
Count
Blocking Tests
Nonblocking Tests
read/write
lseek
read/write
lseek
gr96>0
count
where
count
where
gr96=0
EOF
where
EOF
where
gr96<0
fail
fail
IF= –1 and gr121=EAGAIN,
there is no data available;
otherwise, fail.
In the Return Value table, for blocking completion tests, the return value
specifies the status of the completed operation. If the operation was a
read
or
write
service request, the
count
value specifies the number of bytes actually
transferred (gr96 > 0), that an end-of-file condition was reached (gr96 = 0), or
that a failure occurred (gr96 < 0). For
lseek
requests, the return value specifies
the current position of the file, unless the value is negative, in which case a
failure occurred.
The return value for nonblocking completion tests of
read
and
write
service
requests is interpreted the same as for blocking completion tests, except for the
case where the value in
gr96
is equal to –1. In this case, and if the
errcode
in
register
gr121
is EAGAIN, then no data is currently available. Any other
negative return value or error code signals a failure condition.
The
iowait
service reports errors that may have occurred in the outstanding
asynchronous operation— subsequent to its original issue—as well as errors in
the
iowait
call itself.
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