getenv() in global space?

Discussion in 'C++' started by silrandir, Feb 23, 2006.

  1. silrandir

    silrandir Guest

    When calling getenv() globally, the function returns NULL, yet when
    called from main, returns an appropriate value.

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

    //using namespace std;
    #define MW_DEBUG "TEST"

    char* debugstr = getenv(MW_DEBUG);
    int debug = debugstr?1:0;

    int main()
    write(2, "\nDEBUG Enabled\n", 15);
    write(2, "\nDEBUG DISABLED\n", 16);
    debugstr = getenv(MW_DEBUG);
    write(2, "\nDebug Enabled\n", 15);
    write(2, "\nDebug Disabled\n", 16);
    silrandir, Feb 23, 2006
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  2. So? The behaviour of 'getenv' is implementation-defined. You need to
    read the documentation for your application, perhaps they say that any
    call to 'getenv' is not going to succeed before the 'main' function has
    been called. The platform is probably setting the "environment" just
    before calling your 'main' function.
    Victor Bazarov, Feb 23, 2006
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  3. silrandir

    Ian Collins Guest

    No it doesn't, what system are you using?
    Ian Collins, Feb 23, 2006
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