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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)： | 59/118頁(yè) |
| 文件大小： | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–35
Service 26 – iostat
Input/Output Status
Description
This service returns the status corresponding to a file descriptor assigned by the
open
service. If the specified file descriptor is not legal, an error code will be
returned in
gr121
; otherwise,
gr121
will contain a TRUE result and
gr96
will
contain the requested status. Two status values are defined:
0x0001
0x0002
RDREADY
ISATTY
Input device ready and data available
File descriptor refers to a terminal-like
device (TTY)
Application programs frequently need to determine if data is currently
available to be read for a terminal-like device. If the RDREADY status is
returned, at least one byte of data is available to be read from the device.
The ISATTY status indicates that the device associated with the file descriptor
refers to a terminal-like peripheral, rather than a mass-storage file or other
peripheral device. The
iostat
service can be used to determine if a standard
output device (file descriptors 1 or 2) refers to a terminal, or if output is being
redirected to a mass-storage file.
The RDREADY and ISATTY status values are
not
mutually exclusive; either
or both results may be present. Although the status is returned in a 32-bit word,
only the lower 16 bits are reserved for HIF-conforming reply values. The upper
16 bits are available for implementation-specific status results.
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