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    <p>If you look at the <a href="http://www.aquaphoenix.com/ref/gnu_c_library/libc_239.html" rel="nofollow noreferrer">definition of special characters</a>, that should mean (thre '-1' value), that all those special characters are active:</p> <blockquote> <p>In canonical input, the terminal driver recognizes a number of special characters which perform various control functions.<br> These include the <code>ERASE</code> character (usually <kbd>DEL</kbd>) for editing input, and other editing characters.<br> The INTR character (normally <kbd>Ctrl</kbd>-<kbd>c</kbd>) for sending a <code>SIGINT</code> signal, and other signal-raising characters, may be available in either canonical or noncanonical input mode.</p> </blockquote> <p>And you have a lot of those specal characters:</p> <ul> <li><a href="http://www.aquaphoenix.com/ref/gnu_c_library/libc_240.html#SEC240" rel="nofollow noreferrer">Characters for Input Editing</a></li> <li><a href="http://www.aquaphoenix.com/ref/gnu_c_library/libc_241.html#SEC241" rel="nofollow noreferrer">BSD Extensions to Editing Characters</a></li> <li><a href="http://www.aquaphoenix.com/ref/gnu_c_library/libc_242.html#SEC242" rel="nofollow noreferrer">Characters that Cause Signals</a></li> <li><a href="http://www.aquaphoenix.com/ref/gnu_c_library/libc_243.html#SEC243" rel="nofollow noreferrer">Special Characters for Flow Control</a></li> <li><a href="http://www.aquaphoenix.com/ref/gnu_c_library/libc_244.html#SEC244" rel="nofollow noreferrer">Other Special Characters</a></li> </ul> <hr> <p>The question has been raised to see if <a href="http://www.open-std.org/jtc1/sc22/WG15/docs/rr/9945-1/9945-1-27.html" rel="nofollow noreferrer">such a value was portable</a> (did always compiled) in 1997:</p> <blockquote> <p>The wording in section 2.9.4:</p> <p>If any of the constants in Table 2-11 are defined to have value -1 in the header ....</p> <p>can suggest, on casual reading, code like the following to minimize size and optimize efficiency for each implementation:</p> </blockquote> <pre><code>#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 </code></pre> <p>The <a href="http://standards.ieee.org/reading/ieee/interp/1003-1-90_int/pasc-1003.1-34.html" rel="nofollow noreferrer">interpretation #34</a> suggests that it will.</p> <blockquote> <p>By using these values at COMPILE-TIME, a portable POSIX.1 application can avoid loading all pathconf() related code associated with a symbol in Table 2-11 when the symbol is defined.</p> </blockquote>
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    1. POwhat if _POSIX_VDISABLE value is -1?
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    1. POwhat if _POSIX_VDISABLE value is -1?
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    1. COThe strange thing is that glibc seems to treat it as an unsigned char, which I have never figured out.
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      1. USTim Post
    2. CO@Tim: Hence my links to the interpretations: "The standard makes no requirement that the constant _POSIX_VDISABLE be a preprocessor number."
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    3. COThank you so much.. By the way i m still a student pursuing my Computer Science Engineering :), How do guys have so much of knowledge(asking with respect). I mean i feel, I hardly know anything in this world :(
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      1. USNagaraj Tantri
 

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