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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)： | 32/118頁 |
| 文件大小： | 356K |
| 代理商： | HIF_SPEC |
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3–8
Host Interface (HIF) Specification
32
Service 17 – open
Open a File
Description
This service opens a named file in a requested mode. Files must be explicitly
opened before any
read
,
write
,
close
, or other file-positioning accesses can be
accomplished. The
open
service, if successful, returns an integer token that is
used to refer to the file in all subsequent service requests. In many high-level
languages, the returned token is referred to as a file descriptor. Filenames are
generally not portable from one implementation to another. In some cases,
names can be made more portable by limiting them to six or fewer uppercase
alphabetic characters, or by using the
tmpnam
HIF service (33) to create
names that conform to the current implementation’s file system requirements.
Environment variables can also be used to specify legal filenames for
application programs wishing to conform to the requirements of a particular
HIF implementation. The
getenv
service (65) provides the means to associate a
filename or pathname with a mnemonic reference. This is the most portable
means to specify pathnames for implementations incorporating the
getenv
service.
The HIF specification intentionally refrains from defining the constituents of a
legal pathname or any intrinsic characteristics of the implemented file system.
In this regard, the only requirement of a HIF-conforming kernel is that when
the
open
service is successfully performed, the routine must return a small
integer value that can be used in subsequent input/output service calls to refer
to the opened file.
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