參數(shù)資料
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)： 38/118頁
文件大?。?/td> 356K
代理商： HIF_SPEC
3–14
Host Interface (HIF) Specification
38
Service 18 – close
Close a File
Description
This service closes the open file associated with the file descriptor passed in
lr2
. Closing all files is automatic on program exit (see
exit
), but since there is
an implementation-defined limit on the number of open files per process, an
explicit
close
service call is necessary for programs dealing with many files.
Register Usage
Type
Regs
Contents
Description
Calling:
gr121
18 (0x12)
Service number
lr2
fileno
File descriptor
Returns:
gr96
retval
Success: = 0
Failure: < 0
Logical TRUE, service successful
Error number, service not successful
(implementation dependent)
gr121
0x80000000
errcode
Example Call
fd:
.word
0
const
gr96,fd
;set address of
consth
gr96,fd
;file descriptor
load
0,0,lr2,gr96
;get file descrip-
;tor
const
gr121,18
;service=18
asneq
69,gr1,gr1
;call the OS
jmpf
gr121,clos_err
;handle close
;error
nop
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