HOW TO MANAGE FILE UPTO DEVOPEN IN CHARACTER DRIVER

/MY PROGRAM ARE COMPILED IN FEDORA15 ..WITH 4.6 gcc compiler...../

NOW  TO OPEN OPERATION     ----

/*THERE ARE 3 THINGS REQUIRED======1)DECLARATION OF FUNC-----prototypes.h

  2  *                                 2)MAPPING OF FUN--------file_operation.h

  3  *                                 3)DEFINATION OF FUN-----devopen.c ||devrelease.c ||  devwrite.c     || devread.c */

  4 // DECLARATION & MAPPING finally in file_operation.h will be
included in devopen.c once .....not a    //gain & again included in
devrelease ||devwrite || devread functions......ONLY HEADER FILE
header    .h is included in all other files.......

first file is prototypes.h-----------

  6 #include"header.h"//because header file is required here for struct inode* & struct file*

  7 int devopen(struct inode*,struct file*);

  8 int devrelease(struct inode*,struct file*);

  9 /*struct file_operations fops=

 10   {

 11          open:devopen,

 12          release:devrelease

 13  };*/

 14

 15 //size_t devwrite(struct file*,const char __user *buffer,size_t size,loff_t*);

 16 //struct Scullqset* creaste_scullqset(int);

 17 //int createqset(struct Scullqset*,int);

 18 //int createquantum(struct Scullqset*,int);

 19 //ssize_t devread(struct file*,char __user *buffer,size_t size,loff_t*);

 20 //this file will be added into file_operations

 21

 2nd is file_operation.h

 #include"prototypes.h"//bcz header file for struct file_operations {
& declarations of function       open:devopen or another functions
is required here

  2 struct file_operations fops=

  3 {

  4 open:devopen,

  5 release:devrelease

  6 };

  7 //this file will be added into file_operation.h

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