93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
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#include "pch.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <Windows.h>
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#include <string.h>
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/**************************************************************************
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* Authors: Gary Fleming, Amber McCloughan
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* Class: CIS452 - Operating Systems Concepts
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* Professor: Dr. Greg Wolffe
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* Date: 4/11/2019
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*
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* A mini programming assignment where we do some memory operations in
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* Windows. We get the page size of the system, allocate memory,
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* check the state of that memory, deallocate the memory, and then check
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* the state of the memory again.
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***************************************************************************/
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// See function implementation for details.
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const char *checkMemState(DWORD);
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/**
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* Main function for driving the program.
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*/
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int main()
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{
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// Buffer for holding system info.
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SYSTEM_INFO sysInf;
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// Grabbing system info.
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GetSystemInfo(&sysInf);
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// Figuring out the size of a page and printing it.
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printf("The size of a page is: %lu\n", sysInf.dwPageSize);
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// Allocating a large sum of memory (1M).
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printf("Allocating memory...\n");
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int *bigboy = (int *)malloc(1048576);
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// Buffer for holding memory information.
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MEMORY_BASIC_INFORMATION buf;
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// Querying memory information about the memory we allocated.
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VirtualQuery(bigboy, &buf, sizeof(MEMORY_BASIC_INFORMATION));
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// Printing out the memory's state.
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printf("The state of the memory is: %s\n", checkMemState(buf.State));
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// Freeing the allocated memory.
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printf("Freeing memory...\n");
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free(bigboy);
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// Querying memory information about the memory location again.
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VirtualQuery(bigboy, &buf, sizeof(MEMORY_BASIC_INFORMATION));
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// Printing out the memory's state again.
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printf("The state of the memory is: %s\n", checkMemState(buf.State));
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// Goodbye.
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return 0;
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}
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/**
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* Function that takes the memory state and
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* turns it into a user-readable string.
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*
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* @param DWORD state, the raw value for the
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* memory state.
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*/
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const char *checkMemState(DWORD state)
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{
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// Committed state (0x1000)
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if (state == 4096)
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{
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return "COMMITTED";
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}
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// Free state (0x10000)
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else if (state == 65536)
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{
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return "FREE";
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}
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// Reserved state (0x2000)
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else if (state == 8192)
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{
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return "RESERVED";
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}
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// Catch-all for any issues.
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else
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{
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return "UNKNOWN";
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}
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}
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