Opokornyi

.gitignore

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+05_timers/

01_git/scissors.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define ROCK 'r'
+#define PAPER 'p'
+#define SCISSORS 's'
+
+const char arr[] = {ROCK, PAPER, SCISSORS};
+
+
+int start_game(char input_user, char *machine_choice_c){
+    srand(time(0));
+    int machine_choice_int  = rand() % 3;
+    *machine_choice_c = arr[machine_choice_int];
+    int result;
+    if(input_user == arr[machine_choice_int])
+    {
+        result = -1;
+    }
+    else if (input_user == ROCK && arr[machine_choice_int] == SCISSORS)
+    {
+        result = 1;
+    }
+    else if (arr[machine_choice_int] == ROCK && input_user == SCISSORS)
+    {
+        result = 0;
+    }
+    else if (input_user == PAPER && arr[machine_choice_int] == ROCK)
+    {
+        result = 1;
+    }
+    else if (arr[machine_choice_int] == PAPER && input_user == ROCK)
+    {
+        result = 0;
+    }
+    else if (input_user == SCISSORS && arr[machine_choice_int] == PAPER)
+    {
+        result =  1;
+    }
+    else if (arr[machine_choice_int] == SCISSORS && input_user == PAPER)
+    {
+        result =  0;
+    }
+    else
+    {
+        result = -2;
+    }
+
+    return result;
+}
+
+
+int main () {
+    int result;
+    char input_from_user, machine_chose;
+    printf("Please choose: rock (r) - paper (p) - scissors (s)\n");
+    scanf("%c", &input_from_user);
+    result = start_game(input_from_user, &machine_chose);
+    if(result == -1)
+    {
+         printf("\nYou chose %c and I choose %c, The Friendship wins ! \n\n", input_from_user, machine_chose);
+    }
+    else if (result == 0)
+    {
+        printf("\nYou chose %c and I choose %c, HAHAHAH Machine wins ! \n\n", input_from_user, machine_chose);
+    }
+    else if(result == 1)
+    {
+        printf("\nYou chose %c and I choose %c, You win !\n\n", input_from_user, machine_chose);
+    }
+    else
+    {
+        printf("\nYour chose :%c: is incorrect\n\n", input_from_user);
+    }
+}

02_bash/hwdetect

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+# 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 ?= /home/oporoknyi/Desktop/build/buildroot-2021.02.7/output/build/linux-5.10.7 #WARNING relative path
+
+obj-m := hello.o
+.PHONY: clean
+
+all:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) clean
+

03_module/hello.c

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+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+static int a = 0; 
+static int b = 0;
+
+module_param(a, int, 0660);
+module_param(b, int, 0660);
+
+int hello_init(void)
+{
+	printk(KERN_WARNING "\na + b = %i\n", a + b);
+	return 0;
+}
+
+void hello_exit(void)
+{
+	printk(KERN_WARNING "\na - b = %i\n", a - b);
+
+}
+
+MODULE_LICENSE("GPL");
+
+module_init(hello_init);
+module_exit(hello_exit);

04_basic_struct/Makefile

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+KERNELDIR ?= /home/oporoknyi/Desktop/build/buildroot-2021.02.7/output/build/linux-5.10.7 #WARNING relative path
+
+obj-m := kobj.o
+
+.PHONY: clean
+
+all:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) clean
+

04_basic_struct/kobj.c

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+#define pr_fmt(fmt) "%s: " fmt,  KBUILD_MODNAME
+
+#include <linux/module.h> // Core header for loading LKMs into the kernel
+#include <linux/kobject.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+
+static struct msg_obj {
+    struct list_head list;
+    char *data;
+};
+
+struct list_head head;
+
+static ssize_t kobj_show(struct kobject *kobj, struct kobj_attribute *attr,
+	char *buf)
+{
+    struct msg_obj *curr_msg;
+    struct list_head *listptr;
+    size_t len = 0;
+    list_for_each(listptr, &head) {
+        curr_msg = list_entry(listptr, struct msg_obj, list);
+        strcpy(buf+len, curr_msg->data);
+        len += strlen(curr_msg->data);
+    }
+
+    return len;
+}
+
+static ssize_t kobj_store(struct kobject *kobj, struct kobj_attribute *attr,
+	const char *buf, size_t count)
+{
+    struct msg_obj *new_data = kmalloc(sizeof(struct msg_obj), GFP_KERNEL);
+    new_data->data = kmalloc(sizeof(char)*count, GFP_KERNEL);
+    strcpy(new_data->data, buf);
+    list_add_tail(&new_data->list, &head);
+    return count;
+}
+
+static struct kobj_attribute list_attribute =
+	__ATTR(param, 0664, kobj_show, kobj_store);
+
+static struct kobject *hello_kobj;
+
+static int hello_init(void)
+{
+	int res = 0;
+    INIT_LIST_HEAD(&head);
+	hello_kobj = kobject_create_and_add("hello", kernel_kobj);
+	if (!hello_kobj)
+		return -ENOMEM;
+
+	res = sysfs_create_file(hello_kobj, &list_attribute.attr);
+	if (res)
+		kobject_put(hello_kobj);
+
+	return res;
+}
+
+static void hello_exit(void)
+{
+	kobject_put(hello_kobj);
+	pr_info("module exited\n");
+}
+
+module_init(hello_init);
+module_exit(hello_exit);
+
+MODULE_AUTHOR("Ostap Pokornyi <ostappokornyi@gmail.com>");
+MODULE_DESCRIPTION("Basic data structures module");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1");

05_timers/App/main.c

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+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+
+int main(int argc, char **argv)
+{
+	struct timespec	ts, ts_loc;
+	struct tm	*loctime;
+
+	printf("\n  Absolute time            Local time\n");
+	printf(" tv_nsec     tv_sec        date      time\n");
+	//switch off cursor
+	printf("\033[?25l");
+
+	while (1) {
+		clock_gettime(CLOCK_REALTIME, &ts);
+		// clock_gettime(CLOCK_MONOTONIC, &ts);
+		//clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
+		//clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
+		printf("%10ld  %10ld  ", ts.tv_nsec, ts.tv_sec);
+
+		clock_gettime(CLOCK_REALTIME, &ts_loc);
+		loctime = localtime((time_t *)&ts_loc.tv_sec);
+
+		printf("%02d-%02d-%04d %02d:%02d:%02d",
+					loctime->tm_mday,
+					loctime->tm_mon+1,
+					loctime->tm_year+1900,
+					loctime->tm_hour,
+					loctime->tm_min,
+					loctime->tm_sec);
+
+		usleep(1000);
+		printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
+		printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
+	}
+	printf("\n");
+	return 0;
+}

05_timers/Kern_Module/Makefile

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+KERNELDIR ?= /home/oporoknyi/Desktop/build/buildroot-2021.02.7/output/build/linux-5.10.7 #WARNING relative path
+
+obj-m := timer_mod.o
+
+all:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) clean
+