Please help rectify the error in my code:

studentid.c

#include #include #include #include #include

#define BUFFER_SIZE 128 #define PROC_NAME "idNumber"

static ssize_t proc_read(struct file *file, char __user *usr_buf, size_t count, loff_t *pos);

static struct file_operations proc_ops = { .owner = THIS_MODULE, .read = proc_read, };

/* This function is called when the module is loaded. */ int proc_init(void) { /* creates the /proc/idNumber entry */ proc_create(PROC_NAME, 0666, NULL, &proc_ops);

return 0; }

/* This function is called when the module is removed. */ void proc_exit(void) { /* removes the /proc/idNumber entry */ remove_proc_entry(PROC_NAME, NULL); }

/* This function is called each time /proc/idNumber is read */ ssize_t proc_read(struct file *file, char __user *usr_buf, size_t count, loff_t *pos) { int rv = 0; char buffer[BUFFER_SIZE]; static int completed = 0;

if (completed) { completed = 0; return 0; } completed = 1; rv = sprintf(buffer, "Hello 50008477 ");

/* copies kernel space buffer to user space usr buf */ copy_to_user(usr_buf, buffer, rv);

return rv; }

module_init(proc_init); module_exit(proc_exit);

MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Hello 50008477"); MODULE_AUTHOR("SGG");

Makefile

obj-m += studentid.o

all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean