/*    Copyright 2013 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */

#if defined(__sunos__)

#include "mongo/platform/posix_fadvise.h"

#include <dlfcn.h>

#include "mongo/base/init.h"
#include "mongo/base/status.h"

namespace mongo {
namespace pal {

    int posix_fadvise_emulation(int fd, off_t offset, off_t len, int advice) {
        return 0;
    }

    typedef int (*PosixFadviseFunc)(int fd, off_t offset, off_t len, int advice);
    static PosixFadviseFunc posix_fadvise_switcher = mongo::pal::posix_fadvise_emulation;

    int posix_fadvise(int fd, off_t offset, off_t len, int advice) {
        return posix_fadvise_switcher(fd, offset, len, advice);
    }

} // namespace pal

    // 'posix_fadvise()' on Solaris will call the emulation if the symbol is not found
    //
    MONGO_INITIALIZER_GENERAL(SolarisPosixFadvise,
                              MONGO_NO_PREREQUISITES,
                              ("default"))(InitializerContext* context) {
        void* functionAddress = dlsym(RTLD_DEFAULT, "posix_fadvise");
        if (functionAddress != NULL) {
            mongo::pal::posix_fadvise_switcher =
                    reinterpret_cast<mongo::pal::PosixFadviseFunc>(functionAddress);
        }
        return Status::OK();
    }

} // namespace mongo

#endif // #if defined(__sunos__)