error while compilation of user device driver

Hi, Im a newbie to linux and im trying to do a homework of adding a device to the kernel. Please point out my mistakes in the forum I am trying the sample driver memory.c which i net to load into my kernel my memory.c looks like this Code: #include <linux/init.h> #include <linux/config.h> #include <linux/module.h> #include <linux/kernel.h> /* printk() */ #include <linux/slab.h> /* kmalloc() */ #include <linux/fs.h> /* everything... */ #include <linux/errno.h> /* error codes */ #include <linux/types.h> /* size_t */ #include <linux/proc_fs.h> #include <linux/fcntl.h> /* O_ACCMODE */ #include <asm/system.h> /* cli(), *_flags */ #include <asm/uaccess.h> /* copy_from/to_user */ /* Declaration of memory.c functions */ int memory_open(struct inode *inode, struct file *filp); int memory_release(struct inode *inode, struct file *filp); ssize_t memory_read(struct file *filp, char *buf, size_t count, loff_t *f_pos); ssize_t memory_write(struct file *filp, char *buf, size_t count, loff_t *f_pos); void memory_exit(void); int memory_init(void); /* Structure that declares the usual file / / access functions */ struct file_operations memory_fops = { read: memory_read,  write: memory_write, open: memory_open, release: memory_release }; /* Declaration of the init and exit functions */ module_init(memory_init); module_exit(memory_exit); /* Global variables of the driver / / Major number */ int memory_major = 60; /* Buffer to store data */ char *memory_buffer; /*------------------------------------------------------*/ int memory_init(void) {   int result; /* Registering device */ result = register_chrdev(memory_major, "memory", &memory_fops);  if (result < 0) { printk( "<1>memory: cannot obtain major number %d\n", memory_major); return result;  } /* Allocating memory for the buffer */ memory_buffer = kmalloc(1, GFP_KERNEL); if (!memory_buffer)  { result = -ENOMEM; goto fail; } memset(memory_buffer, 0, 1); printk("<1>Inserting memory module\n"); return 0; fail: memory_exit(); return result;  } /*---------------------------------------------*/ void memory_exit(void)  {   /* Freeing the major number */   unregister_chrdev(memory_major, "memory"); /* Freeing buffer memory */ if (memory_buffer)  { kfree(memory_buffer);  } printk("<1>Removing memory module\n"); } /*-------------------------------*/ int memory_open(struct inode *inode, struct file *filp) { /* Success */  return 0; } /*-------------------------------*/ int memory_release(struct inode *inode, struct file *filp) { /* Success */ return 0;  } /*-------------------------------*/ ssize_t memory_read(struct file *filp, char *buf,                     size_t count, loff_t *f_pos) { /* Transfering data to user space */ copy_to_user(buf,memory_buffer,1); /* Changing reading position as best suits */ if (f_pos == 0)  {  *f_pos+=1; return 1; }  else  {  return 0;  } } /*-------------------------------*/ ssize_t memory_write( struct file *filp, char *buf,                       size_t count, loff_t *f_pos) { char *tmp; tmp=buf+count-1; copy_from_user(memory_buffer,tmp,1); return 1; } Makefile used is Code: obj-m        += memory.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 the error im getting is sathish/sathish-desktop:~$ make memory cc memory.c -o memory memory.c:1:24: error: linux/init.h: No such file or directory memory.c:4:26: error: linux/config.h: No such file or directory memory.c:7:26: error: linux/module.h: No such file or directory memory.c:13:40: error: linux/slab.h: No such file or directory memory.c:25:27: error: linux/proc_fs.h: No such file or directory In file included from /usr/include/asm/fcntl.h:1, from /usr/include/linux/fcntl.h:4, from memory.c:28: /usr/include/asm-generic/fcntl.h:96: error: expected specifier-qualifier-list before 'pid_t' memory.c:31:45: error: asm/system.h: No such file or directory memory.c:34:49: error: asm/uaccess.h: No such file or directory memory.c:37: error: expected declaration specifiers or '...' before string constant memory.c:37: warning: data definition has no type or storage class memory.c:41: warning: 'struct file' declared inside parameter list memory.c:41: warning: its scope is only this definition or declaration, which is probably not what you want memory.c:41: warning: 'struct inode' declared inside parameter list memory.c:42: warning: 'struct file' declared inside parameter list memory.c:42: warning: 'struct inode' declared inside parameter list memory.c:43: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'memory_read' memory.c:44: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'memory_write' memory.c:49: error: variable 'memory_fops' has initializer but incomplete type memory.c:50: error: unknown field 'read' specified in initializer memory.c:50: error: 'memory_read' undeclared here (not in a function) memory.c:50: warning: excess elements in struct initializer memory.c:50: warning: (near initialization for 'memory_fops') memory.c:51: error: unknown field 'write' specified in initializer memory.c:51: error: 'memory_write' undeclared here (not in a function) memory.c:51: warning: excess elements in struct initializer memory.c:51: warning: (near initialization for 'memory_fops') memory.c:52: error: unknown field 'open' specified in initializer memory.c:52: warning: excess elements in struct initializer memory.c:52: warning: (near initialization for 'memory_fops') memory.c:53: error: unknown field 'release' specified in initializer memory.c:53: warning: excess elements in struct initializer memory.c:53: warning: (near initialization for 'memory_fops') memory.c:57: warning: data definition has no type or storage class memory.c:57: warning: parameter names (without types) in function declaration memory.c:58: warning: data definition has no type or storage class memory.c:58: warning: parameter names (without types) in function declaration memory.c: In function 'memory_init': memory.c:81: error: 'GFP_KERNEL' undeclared (first use in this function) memory.c:81: error: (Each undeclared identifier is reported only once memory.c:81: error: for each function it appears in.) memory.c:86: warning: incompatible implicit declaration of built-in function 'memset' memory.c: At top level: memory.c:116: warning: 'struct file' declared inside parameter list memory.c:116: warning: 'struct inode' declared inside parameter list memory.c:116: error: conflicting types for 'memory_open' memory.c:41: note: previous declaration of 'memory_open' was here memory.c:125: warning: 'struct file' declared inside parameter list memory.c:125: warning: 'struct inode' declared inside parameter list memory.c:125: error: conflicting types for 'memory_release' memory.c:42: note: previous declaration of 'memory_release' was here memory.c:136: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'memory_read' memory.c:158: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'memory_write' make: *** [memory] Error 1 sathish/sathish-desktop:~$ Please let me know the reason for this error , i tried sudo apt-get update but in vain. Thanks in advance.

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