master commit

.Module.symvers.cmd

+cmd_/home/student/Module.symvers := sed 's/\.ko$$/\.o/' /home/student/modules.order | scripts/mod/modpost  -a   -o /home/student/Module.symvers -e -i Module.symvers  -N -T -

.abcd.ko.cmd

+cmd_/home/student/abcd.ko := ld -r -m elf_x86_64 --build-id=sha1  -T scripts/module.lds -o /home/student/abcd.ko /home/student/abcd.o /home/student/abcd.mod.o;  true

.abcd.mod.cmd

+cmd_/home/student/abcd.mod := { echo  /home/student/abcd.o;  echo; } > /home/student/abcd.mod

.modules.order.cmd

+cmd_/home/student/modules.order := {   echo /home/student/abcd.ko; :; } | awk '!x[$$0]++' - > /home/student/modules.order

Makefile

+obj-m := abcd.o
+    
+build:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+	sudo insmod abcd.ko
+	sudo mknod /dev/abcd c 238 0
+	
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
+	-sudo rmmod abcd.ko
+	-sudo rm /dev/abcd

abcd.mod

+/home/student/abcd.o
+

exos/Makefile

+objects = ex_read ex_write
+all: $(objects)
+
+$(objects): %: %.c
+	$(CC) $(CFLAGS) -o $@ $<
\ No newline at end of file

exos/ex_read.c

+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+int main(void)
+{
+    char buffer[50] = "";
+    int file = open("/dev/abcd", O_RDWR);
+    
+    if(file < 0) {
+        perror("open");
+        exit(errno);
+    }
+    
+    //Number of chars in file
+    printf("%d\n", read(file, buffer, 50));   
+    close(file);  
+    return 0;
+}
\ No newline at end of file

exos/ex_write.c

+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+int main(void)
+{
+    char buffer[50] = "";
+    int file = open("/dev/abcd", O_RDWR);
+    
+    if(file < 0) {
+        perror("open");
+        exit(errno);
+    }
+    
+    //Writes into file
+    write(file, buffer, 50);
+    close(file); 
+    return 0;
+}

modules.order

+/home/student/abcd.ko