Create FIFO-paging-algorithm.c

Author: tr3sp4ss3rexe

FIFO-paging-algorithm.c

@@ -0,0 +1,75 @@
+/*
+Simulating the physical memory and its paging process
+using the FIFO algorithm and
+counting the page faults
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+int main(int argc, char** argv) {
+    
+    if (argc != 4) {
+        printf("Wrong inputs. should be 3 arguments!");
+        return 0;
+    }
+
+    unsigned int noPhysPages = atoi(argv[1]);
+    unsigned int pageSize = atoi(argv[2]);
+    char* fileName = argv[3];
+    unsigned int front = 0, rear = 0, count = 0;
+    unsigned int pageFaults = 0;
+    unsigned int address, page;
+    unsigned int references = 0;
+
+    if (noPhysPages == 0 || pageSize == 0) {
+        printf("page size or no physical pages cant be 0!");
+        return 0;
+    }
+
+    printf("No physical pages = %u, page size = %u\n", noPhysPages, pageSize);
+    printf("Reading memory trace from %s... \n", fileName);
+
+    FILE* fp = fopen(fileName, "r");
+
+    unsigned int* queue = malloc(noPhysPages * sizeof(unsigned int));
+
+    while (fscanf(fp, "%u", &address) != EOF) {
+        page = address / pageSize;
+        int found = 0;
+
+        for (unsigned int i = 0; i < count; i++) {
+            unsigned int idx = (front + i) % noPhysPages;
+            if (queue[idx] == page) {
+                found = 1;
+                break;
+            }
+        }
+
+        if (!found) {
+            pageFaults++;
+            if (count < noPhysPages) {
+                // Queue not full, add page at rear
+                queue[rear] = page;
+                rear = (rear + 1) % noPhysPages;
+                count++;
+            } else {
+                // Queue full, replace the oldest page at front
+                queue[front] = page;
+                front = (front + 1) % noPhysPages;
+                rear = (rear + 1) % noPhysPages;
+            }
+        }
+        references++;
+    }
+    fclose(fp);
+
+    printf("Read %u memory references\n", references);
+    printf("Result: %u page faults\n", pageFaults);
+
+    free(queue);
+    return EXIT_SUCCESS;
+}
+