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    SubjectRe: _SC_* gone?
    ats@hubert.wustl.edu (Alan Shutko)  wrote on 25.07.96 in <199607260408.XAA03395@hubert.wustl.edu>:

    > >>>>> "CP" == Carlos Puchol <cpg@cs.utexas.edu> writes:

    CP>> /* The following table is generated from all _SC_ values * in
    CP>> unistd.h.

    > Taking a look at <unistd.h>, I see:
    >
    > /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and
    > `fpathconf'; the `_SC_*' symbols for the NAME argument to
    > `sysconf'; and the `_CS_*' symbols for the NAME argument to
    > `confstr'. */
    > #include <confname.h>
    >
    > Evidently, the sml tries to pull the values out, but doesn't follow
    > the include. Even if they did, it probably wouldn't have worked
    > since confname.h uses an enum to define them. I'm not sure how you
    > could get them in an automated way....

    Easy. Write a C program that #includes <unistd.h> (that is, it gets the
    definitions the standard C way) and outputs whatever syntax you prefer,
    like for exampel so:

    #include <unistd.h>
    #include <stdio.h>

    main()
    {
    printf("_SC_OPEN_MAX = %d\n", (int)_SC_OPEN_MAX);
    }

    If you want to get at standardized constant definitions, that is a very
    portable way to do it. It's a lot easier to get right than going through
    the include files yourself.


    MfG Kai


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