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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)： | 65/118頁 |
| 文件大小： | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–41
Service 65 – getenv
Get Environment
Description
This service searches the system environment for a string associated with a
specified symbol.
lr2
contains a pointer to the symbol name. If the symbol
name is found, a pointer to the string associated with it is returned in
gr96
;
otherwise, a NULL pointer is returned.
In UNIX-hosted systems, the
setenv
command allows a user to associate a
symbol with an arbitrary string. For example, the command
setenv TERM
vt100
defines the string
vt100
to be associated with the symbol named
TERM.
Application programs can use this association to determine the type of terminal
connected to the system, and therefore, use the correct set of codes when
outputting information to the user’s screen. To access the string,
getenv
should
be called with
lr2
pointing to a string containing the
TERM
symbol name. The
address returned in
gr96
will point to the corresponding vt100 string if
TERM
is found. In UNIX-hosted systems, entering a different
setenv
command lets
the user select a different terminal name without requiring recompilation of the
application program.
Operating-system implementations that do not include provisions for the
environment variable, if always, should return a NULL value in
gr96
when this
service is requested.
Register Usage
Type
Regs
Contents
Description
Calling:
gr121
65 (0x41)
Service number
lr2
name
A pointer to the symbol name
Returns:
gr96
addrptr
Success: pointer to the symbol name
string
Failure: =0 (NULL pointer)
gr121
0x80000000
errcode
Logical TRUE, service successful
Error number, service not successful
(implementation dependent)
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