Proc file system editing

 

Proc file system concept

Proc is a virtual file system used for Linux kernel space and user space communication. In Linux, Proc is not alone,SysfsIs a file system similar to/proc. It appears after proc, so it improves proc's disadvantages.

struct proc_dir_entry {const char *name;// virtual file namemode_t mode;// mode permissionsuid_t uid;// File's user idgid_t gid;// File's group idstruct inode_operations *proc_iops;// Inode operations functionsstruct file_operations *proc_fops;// File operations functionsstruct proc_dir_entry *parent;// Parent directory...read_proc_t *read_proc;// /proc read functionwrite_proc_t *write_proc;// /proc write functionvoid *data;// Pointer to private dataatomic_t count;// use count...};
struct proc_dir_entry *create_proc_entry( const char *name, mode_t mode,                                             struct proc_dir_entry *parent );void remove_proc_entry( const char *name, struct proc_dir_entry *parent );

The parent parameter can be null (indicating the/proc root directory) or many other values, depending on where we want to put the file.
The following lists some other parent nodes that can be used.proc_dir_entryAnd their location in the file system.



   
   
 
    
 
     
 
      
Proc_dir_entry
 
      
Location in the file system
 
     
 
     
 
      
proc_root_fs
 
      
/proc
 
     
 
     
 
      
proc_net
 
      
/proc/net
 
     
 
     
 
      
proc_bus
 
      
/proc/bus
 
     
 
     
 
      
proc_root_driver
 
     
 
    
 
   

   
   
 
    
 
     
 
      
        /* Create a directory in the proc filesystem */struct proc_dir_entry *proc_mkdir( const char *name,                                     struct proc_dir_entry *parent );/* Create a symlink in the proc filesystem */struct proc_dir_entry *proc_symlink( const char *name,                                       struct proc_dir_entry *parent,                                       const char *dest );/* Create a proc_dir_entry with a read_proc_t in one call */struct proc_dir_entry *create_proc_read_entry( const char *name,                                                  mode_t mode,                                                  struct proc_dir_entry *base,                                                  read_proc_t *read_proc,                                                  void *data );
 
     
 
    
 
   

 
 
 
 
 
 
The preceding editing is from the following URL:
Http://www.ibm.com/developerworks/cn/linux/l-proc.html