问题描述
在POSIX _POSIX_VDISABLE值(如果为-1)中，对于所有终端设备文件，都没有针对特殊字符的禁用字符；否则，该值为禁用字符值.
In POSIX _POSIX_VDISABLE value if -1, there is no disabling character for special character for all the terminal device files; otherwise the value is the disabling character value..
请任何人帮助我理解这一点.我无法获得确切的含义.
Can please anyone help me understand this. I m not able to get the exact meaning of this.
请
推荐答案
如果您查看定义特殊字符，应表示(所有"-1"值)所有这些特殊字符均处于活动状态:
If you look at the definition of special characters, that should mean (thre '-1' value), that all those special characters are active:
您有很多特殊字符:
- Characters for Input Editing
- BSD Extensions to Editing Characters
- Characters that Cause Signals
- Special Characters for Flow Control
- Other Special Characters
提出了一个问题，以查看是否这样的值在1997年是可移植的(总是编译):
The question has been raised to see if such a value was portable (did always compiled) in 1997:
如果表2-11中的任何常量被定义为在标头中具有值-1.
If any of the constants in Table 2-11 are defined to have value -1 in the header ....
在随意阅读时可以建议如下代码以最大程度地减小大小 并优化每种实施的效率:
can suggest, on casual reading, code like the following to minimize size and optimize efficiency for each implementation:
#ifdef _POSIX_VDISABLE
#if _POSIX_VDISABLE == -1
/* code that assumes no vdisable capability */
#else
/* code that assumes vdisable capability */
#endif
#else
/* code that uses pathconf() to determine vdisable capability */
#endif
解释#34 建议.
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