Volodymyr.kniazkyi

01_git/makefile

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+#
+# makefile of scissors-paper game project
+#
+
+HEADERS = scissors.h
+OBJECTS = scissors.o
+
+scissors: ${OBJECTS}
+		gcc -o scissors ${OBJECTS}
+
+scissors.o: scissors.c $(HEADERS)
+		gcc -c scissors.c
+
+.PHONY: clean
+
+clean:
+		rm $(OBJECTS)

01_git/scissors.c

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+/*
+ * Main file of scissors-paper project
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "scissors.h"
+#include <time.h>
+
+//
+// Return name of material chose by gamer
+//
+char* getmaterial(char gamersymb)
+{
+  switch(gamersymb)
+  {
+    case SYMB_ROCK:
+      return STR_ROCK;;
+    case SYMB_PAPER:
+      return STR_PAPER;
+    case SYMB_SCISSORS:
+      return  STR_SCISSORS;
+  }
+}
+
+//
+// Calculate who is winner of game
+//
+int getwinner(char gamer1, char gamer2)
+{
+  int ret = WINNER_NO;
+
+  if(gamer1==gamer2)  return WINNER_NO;
+  switch(gamer1)
+  {
+  case SYMB_PAPER:
+    if(SYMB_ROCK==gamer2)  ret = WINNER_1;
+    else                  ret = WINNER_2;
+    break;
+  case SYMB_ROCK:
+    if(SYMB_PAPER==gamer2)  ret = WINNER_2;
+    else                   ret = WINNER_1;
+    break;
+  case SYMB_SCISSORS:
+    if(SYMB_ROCK==gamer2)  ret = WINNER_2;
+    else                  ret = WINNER_1;
+    break;
+  default:
+    ret = WINNER_ERR;
+    break;
+  }
+  return ret;
+}
+
+int main()
+{
+  char sgamer[256],gamer,computer,winner;
+
+  gamer = computer = winner = 0;
+  srand(time(NULL));  //Initialisation of random function
+
+  for(;;){
+    // Get user choise
+    for(;;){
+      printf("\n\tPlease, choose rock (%c) - paper(%c) - scissors(%c) exit - (%c)\n\t",\
+      SYMB_ROCK,SYMB_PAPER,SYMB_SCISSORS,SYMB_EXIT);
+
+      if(NULL==fgets((char*)sgamer,sizeof(sgamer),stdin)){
+        printf("\n\tInput error");
+        return 1;
+      }
+      if(2<strlen((char*)sgamer)){
+        printf("\n\t too much symbols (%li) %s",strlen((char*)sgamer)-1,sgamer);
+        continue;
+      }
+      gamer = sgamer[0];
+      if(SYMB_EXIT==gamer)  return 0;
+      if((SYMB_PAPER==gamer)||(SYMB_ROCK==gamer)||(SYMB_SCISSORS==gamer)) break;
+      printf("\n\tWrong choise  - (%c)\n\t",gamer);
+    }
+
+    //Get computer choise
+    computer = rand()%3;
+    switch(computer){
+      default:
+      case 0:
+        computer = SYMB_ROCK;
+        break;
+      case 1:
+        computer = SYMB_PAPER;
+        break;
+      case 2:
+        computer = SYMB_SCISSORS;
+        break;
+    }
+
+    // Get winner of game
+    winner = getwinner(gamer,computer);
+    if(WINNER_ERR==winner){
+      printf("\n\tgetwinner error\n\t");
+      return 1;
+    }
+    if(WINNER_NO==winner){
+      printf("\n\tNo sides!\n\t");
+    }
+    else{
+      if(WINNER_1==winner){
+        printf("\n\tYou won: %s beats %s",getmaterial(gamer),getmaterial(computer));
+      }
+      else{
+        printf("\n\tI won: %s beats %s",getmaterial(computer),getmaterial(gamer));
+      }
+    }
+  }
+  return 0;
+}

01_git/scissors.h

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+#ifndef __SCISSORS_H__
+#define __SCISSORS_H__
+
+/*
+ * Header file with configuration of
+ * scissors-paper project
+ */
+#define SYMB_EXIT      'e'
+#define SYMB_PAPER     'p'
+#define SYMB_ROCK      'r'
+#define SYMB_SCISSORS  's'
+
+#define STR_PAPER     "paper"
+#define STR_ROCK      "rock"
+#define STR_SCISSORS  "scissors"
+
+#define WINNER_1    1
+#define WINNER_2    2
+#define WINNER_NO   0
+#define WINNER_ERR  -1
+
+#endif

02_bash/hwdetect.sh

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+#!/bin/bash
+
+# delete temporary files
+cleanup() {
+  rm udev.txt
+  rm udev_new.txt
+  rm i2cdev.txt
+  rm i2cdev_new.txt
+  echo "cleaning up..."
+  exit
+}
+
+echo "Device conecting monitor"
+echo "For exit press Ctrl-C"
+
+# detect usb devices
+lsusb > udev.txt
+
+# detect i2c devices
+i2cdetect -l >i2cdev.txt
+
+while true
+do
+# create new list of usb devices
+  lsusb > udev_new.txt
+# create new list of i2c devices
+  i2cdetect -l >i2cdev_new.txt
+
+# look for differences in usb devices list
+  diffresult=$(diff udev.txt udev_new.txt)
+  size=$(wc -c < udev.txt)
+  size_new=$(wc -c < udev_new.txt)
+# show differences
+  if [ $size -ne $size_new ]
+    then
+      if [ $size -gt $size_new ]
+      then
+        echo "Disconnected USB devices:"
+      else
+        echo "Connected USB devices:"
+      fi
+      echo $diffresult
+      mv -f udev_new.txt udev.txt
+    fi
+
+# look for differences in i2c devices list
+    diffresult=$(diff i2cdev.txt i2cdev_new.txt)
+    size=$(wc -c < i2cdev.txt)
+    size_new=$(wc -c < i2cdev_new.txt)
+# show differences
+    if [ $size -ne $size_new ]
+      then
+        if [ $size -gt $size_new ]
+        then
+          echo "Disconnected i2c devices:"
+        else
+          echo "Connected i2c devices:"
+        fi
+        echo $diffresult
+        mv -f i2cdev_new.txt i2cdev.txt
+      fi
+
+  sleep  1
+# check if Ctrl-C pressed and exit
+  trap  'cleanup' INT
+done

03_module/Makefile

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+KERNELDIR ?= ../output/build/linux-5.10.7/ #WARNING relative path
+
+obj-m := prmmod.o
+
+all:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) clean

03_module/dump.txt

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+# cd /home/user
+# insmod prmmod.ko fprm=10 sprm=20
+prmmod: loading out-of-tree module taints kernel.
+prmmod: module license 'unspecified' taints kernel.
+Disabling lock debugging due to kernel taint
+Module with parameters fprm=10 sprm=20 initialisation!
+The sum of parameters fprm and sprm is 30
+# rmmod prmmod.ko
+Module with parameters fprm=10 sprm=20 initialisation!
+The substraction of parameters fprm and sprm is -10
+Bye Bye...
+# insmod prmmod.ko
+Module with parameters fprm=1 sprm=2 initialisation!
+The sum of parameters fprm and sprm is 3
+# rmmod prmmod.ko
+Module with parameters fprm=1 sprm=2 initialisation!
+The substraction of parameters fprm and sprm is -1
+Bye Bye...

03_module/prmmod.c

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+/*
+* Simple module as example of usage modules with parameters
+*/
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+//first parameter initialisation
+static int fprm = 1;
+module_param(fprm,int,0660);
+
+//second parameter initialisation
+static int sprm = 2;
+module_param(sprm,int,0660);
+
+
+int prmmod_init(void)
+{
+	printk(KERN_INFO "Module with parameters fprm=%d sprm=%d initialisation!\n",fprm,sprm);
+	printk(KERN_INFO "The sum of parameters fprm and sprm is %d\n",fprm+sprm);
+	return 0;
+}
+
+
+void prmmod_exit(void) {
+	printk(KERN_INFO "Module with parameters fprm=%d sprm=%d initialisation!\n",fprm,sprm);
+	printk(KERN_INFO "The substraction of parameters fprm and sprm is %d\n",fprm-sprm);
+	printk(KERN_INFO "Bye Bye...\n");
+}
+
+module_init(prmmod_init);
+module_exit(prmmod_exit);

04_basic_struct/Makefile

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+KERNELDIR ?= ../output/build/linux-5.10.7/ #WARNING relative path
+
+obj-m := recv_msg.o
+
+all:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) clean

04_basic_struct/dump.txt

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+# insmod /home/user/recv_msg.ko
+# echo message1 > /sys/kernel/recv_msg/list
+# echo message2 > /sys/kernel/recv_msg/list
+# echo message3 > /sys/kernel/recv_msg/list
+# cat /sys/kernel/recv_msg/list
+message1
+message2
+message3
+# rmmod /home/user/recv_msg.ko
+#