Add programm to read meminfo

Read_System_Info/read_sys.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define SIZE 1000
+
+int main(void){
+	
+	int file = open("/proc/meminfo", O_RDONLY);
+	if(file == -1){
+		perror("open error");
+		return -1;
+	}
+	char *buffer = malloc(SIZE*sizeof(char));
+	int rd = read(file, buffer, SIZE);
+	if(rd == -1){
+		perror("read error");
+		free(buffer);
+		close(file);
+		return -1;
+	}
+	
+	char mem_total[SIZE];
+	char mem_free[SIZE];
+	char mem_cach[SIZE];
+	
+	sscanf(buffer, "%*s %s %*s %*s %s %*s %*s %*s %*s %*s %*s %*s %*s %s", mem_total, mem_free, mem_cach);
+	printf("MemTotal: %s\nMemFree: %s\nCached: %s\n", mem_total, mem_free, mem_cach);
+
+	free(buffer);
+	close(file);
+	return 0;
+}