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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演示板的經營理論主機接口（誘導因子）規(guī)格 |
| 文件頁數： | 34/118頁 |
| 文件大小： | 356K |
| 代理商： | HIF_SPEC |
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3–10
Host Interface (HIF) Specification
34
Table 3–4. Open Service Mode Parameters
Name
Value
Description
O_RDONLY
0x0000
Open for read-only access
O_WRONLY
0x0001
Open for write-only access
O_RDWR
0x0002
Open for read and write access
O_APPEND
0x0008
Always append when writing
O_NDELAY
0x0010
No delay
O_CREAT
0x0200
Create file if it does not exist
O_TRUNC
0x0400
If the file exists, truncate it to zero length
O_EXCL
0x0800
Fail if writing and the file exists
O_FORM
0x4000
Open in text format
The O_RDONLY mode provides the means to open a file and guarantee that
subsequent accesses to that file will be limited to
read
operations. The
operating system implementation will determine how errors are reported for
unauthorized operations. The file pointer is positioned at the beginning of the
file unless the O_APPEND mode is also selected.
The O_WRONLY mode provides the means to open a file and guarantee that
subsequent accesses to that file will be limited to
write
operations. The
operating system implementation will determine how errors are reported for
unauthorized operations. The file pointer is positioned at the beginning of the
file unless the O_APPEND mode is also selected.
The O_RDWR mode provides the means to open a file for subsequent
read
and
write
accesses. The file pointer is positioned at the beginning of the file
unless the O_APPEND mode is also selected.
If O_APPEND mode is selected, the file pointer is positioned to the end of the
file at the conclusion of a successful
open
operation, so that data written to the
file is added following the existing file contents.
Ordinarily, a file must already exist in order to be opened. If the O_CREAT
mode is selected, files that do not currently exist are created; otherwise, the
open
function will return an error condition in
gr121
.
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