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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（誘導因子）規(guī)格 |
| 文件頁數(shù)： | 41/118頁 |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–17
Return Value
Count
Non-ASYNC
ASYNC
NBLOCK
gr96>0
count
n/a
count
gr96 =0
EOF
success
EOF
gr96 <0
fail
fail
if = –1 and gr121 = EAGAIN,
no data is available. Other-
wise, fail.
In the Return Value table, for normal synchronous
read
service requests, the
return value contains a
count
of the number of bytes read (if
gr96
> 0),
end-of-file (if
gr96
= 0), or an indication that the operation failed (
gr96
< 0).
For ASYNC mode, the operation is only scheduled by invoking the
read
service, so the return value in
gr96
merely indicates that the request succeeded
or failed. Nonblocking
read
requests indicate that data is to be returned if
available; otherwise, the service is to return control to the user process with an
indication that the operation would block if allowed to continue. When
gr96
contains the value –1, and the
errcode
value in register
gr121
is EAGAIN, then
no data is available to be read. If
gr96
contains any other negative value, or if
register
gr121
contains any other error code, the service request was not
accepted.
If the operating mode of the file descriptor referenced by the
read
service has
previously been set to ASYNC using the
ioctl
service, the
iowait
service
should be used to test the completion status of this operation, and to access the
number of bytes that have been transferred. If a previously issued
asynchronous
read
,
write
, or
lseek
operation is not complete, the current
read
request will return a failure status. Only one outstanding request is allowed.
If the operating mode has previously been set to NBLOCK (nonblocking), the
count
gr96
will only reflect the number of bytes currently
available in the buffer. NBLOCK mode only applies to terminal-like devices.
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