// checking for madvise() in <sys/mman.h>

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 *
 * Licensed to the Apache Software  Foundation (ASF) under one or more
 * contributor  license agreements.  See  the NOTICE  file distributed
 * with  this  work  for  additional information  regarding  copyright
 * ownership.   The ASF  licenses this  file to  you under  the Apache
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 * except in  compliance with the License.   You may obtain  a copy of
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
 * implied.   See  the License  for  the  specific language  governing
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 * Copyright 1999-2007 Rogue Wave Software, Inc.
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#include <sys/mman.h>    // for madvise(), MADV_WILLNEED
#include <sys/types.h>   // for caddr_t


int main (int argc, char *argv[])
{
    const caddr_t addr = (caddr_t)argv;

    const int result = madvise (addr, argc, MADV_WILLNEED);

    if (1 < argc) {
        // invoke with any command line arguments to test
        return result;
    }

    // always succeed when invoked without arguments
    return 0;
}