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#include "align.h" 
#include "compiler.h" 
#include "info.h" 
#include "mincore.h" 
 
#include <util/generic/yexception.h> 
 
#include <cstring> 
 
#if defined(_unix_) 
    #include <sys/unistd.h>
    #include <sys/mman.h>
    #if defined(_android_)
        #include <sys/syscall.h>
    #endif
#endif 
 
void InCoreMemory(const void* addr, size_t len, unsigned char* vec, size_t vecLen) { 
#if defined(_linux_) 
    const size_t pageSize = NSystemInfo::GetPageSize(); 
    void* maddr = const_cast<void*>(AlignDown(addr, pageSize)); 
    len = AlignUp(len, pageSize); 
    if (vecLen * pageSize < len) { 
        ythrow yexception() << "vector argument for mincore is too small: " << vecLen * pageSize << " < " << len; 
    } 
    if (::mincore(maddr, len, vec)) { 
        ythrow yexception() << LastSystemErrorText(); 
    } 
#else 
    // pessimistic assumption: nothing is in core 
    Y_UNUSED(addr); 
    Y_UNUSED(len); 
    ::memset(vec, 0, vecLen); 
#endif 
}