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| 型號(hào)： | 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(yíng)理論主機(jī)接口（誘導(dǎo)因子）規(guī)格 |
| 文件頁(yè)數(shù)： | 35/118頁(yè) |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–11
35
If a file being opened already exists and the O_TRUNC mode is selected, the
original contents of the file are discarded and the file pointer is placed at the
beginning of the (empty) file. If the file does not already exist, the HIF service
routine should return an error value in
gr121
, unless O_CREAT mode is also
selected.
The O_EXCL mode provides a method for refusing to open the file if the
O_WRONLY or O_RDWR modes are selected and the file already exists. In
this case, the kernel service routine should return an error code in
gr121
.
O_FORM mode indicates that the file is to be opened as a text file rather than
a binary file. The nominal standard input, output, and error files (file
descriptors 0, 1, and 2) are assumed to be open in text mode prior to
commencing execution of the user’s program.
When opening a FIFO (interprocess communication file) with O_RDONLY or
O_WRONLY set, the following conditions apply:
If O_NDELAY is set (i.e., equal to 0x0010):
– A read-only open will return without delay.
– A write-only open will return an error if no process currently has the file
open for reading.
If O_NDELAY is clear (i.e., equal to 0x0000):
– A read-only open will block until a process opens a file for writing.
– A write-only open will block until a process opens a file for reading.
When opening a file associated with a communication line (e.g., a remote
modem or terminal connection), the following conditions apply:
If O_NDELAY is set, the open will return without waiting for the carrier
detect condition to be TRUE.
If O_NDELAY is clear, the open will block until the carrier is found to be
present.
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