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Best Way To Restore Source Code Of Proc Filesystem

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    It looks like some readers have come across an error message familiar with the source code of the proc filesystem. This problem can arise for several reasons. Let’s discuss this now.

     / * procfs.c - create a "file" in / proc * * Copyright (C) 2001 Peter Jay * Salzman 02/08/2006 - Updated by Rodrigo Rubir Branco  * // * Kernel programming * /Define #LINUX# Define a module#define __KERNEL__#include  / * Check if the kernel is running  / * In particular * // * Module deal with CONFIG_MODVERSIONS * /#if CONFIG_MODVERSIONS == 1#define MODVERSIONS#include #end if/ * Required because we are using the main routine fs * /#include / * Contains /usr/include/linux/version.h in 2.2.3 a macro for this, but 2.0.35 will be - so I'll add it (Space) here if applicable * /#ifndef KERNEL_VERSION (a, b, c) kernel version#define ((a) * 65536 + (b) * 256 + (c))#end if/ * Paste the data into a new proc file fs.   Arguments  =========    1. The buffer into which the data should be inserted, if      You decide, enjoy.   2. And according to the pointer to the pointer of the heroines. So to speak      useful when we don't want to use our buffer      is determined by the kernel.   Three main ones. The current position in the instruction.   4. Size I would say that the size of the buffer in the argument at the beginning.   five different. Zero (for the future?).   Usage and return value   =======================   Es And you will use a tampon, how can I put it on   Come up with a second argument and go home   Most of the bytes are used in the buffer.   The return value of focus means you don't need further from   Information at the moment (end of file).   The return value is an error condition.      For more information  ======================   How did I know what to do in this role   read the documentation but studied   The code of who used it. i just looked and saw that it is helpful   this is the get_info field of the proc_dir_entry structure (I have   a mixture of find and grep, so if you're curious),   and after that I saw it in  /fs/proc/array.c.   If the situation with such a kernel is unknown, it is   in general it is a road. On Linux, some of us have the best   Advantage of having a kernel type for code   completely free - use it. * /#if LINUX_VERSION_CODE> KERNEL_VERSION (2,4,0)int * buffer, procfile_read (char                  char ** buffer_location, off_t offset,                  buffer length int, int * eof, void * data)#differentint * buffer, procfile_read (charsymbol ** buffer_location,off_t offset,int buffer_length,zero integer)#end if  full length; / * Actually   Used different bytes * /  / * This is static so it will always be remembered   * when exiting this function * /  the old-fashioned character my_buffer [80];  Normal ole int count = 1;  / * We return all our information at once, so often   * User asks you. S. When we have more information, some of   * The answer must always be negative.   *   * This is definitely important because standard transparency   * Library function will always go to edit   * Call the reader until the kernel responds   * that he has almost no additional information, or so far all of his   * The buffer must be full.   * /  in (offset> 0)   reproduce 0;  / * Fill in the download and get its length * /  len = sprintf (my_buffer,    "Search for% d% s!  N", count,    (count pages c 100> 10 && add% 100 <14)! ! "T":      (account% 10 == 1) "st":        (do you count every 10 == 2)? "Nd":          (Count% ten == 3)? "rd": - "th");  count ++;  / * Tell the function that called us the place where   * Channel * /  * buffer_location matches my_buffer;  / * Return segment * /  Back flax;#if LINUX_VERSION_CODE> KERNEL_VERSION (2,4,0)struct proc_dir_entry * Our_Proc_File;#differentstruct proc_dir_entry Our_Proc_File tabout the same      two, / * inode number - ignore that it is full        - proc_register [_dynamic] * /    4, / * length of directory name * /    "test", / * File name * /    S_IFREG;#end if/ * Initialize the game - save the proc file * /int module_init ()  / * Success if proc_register [_dynamic] was successful,  7. If not, fail. * /#if LINUX_VERSION_CODE KERNEL_VERSION (2,2,0) > / * In version 2.2 proc_register gives dynamic   Inode * number automatically if app is empty in   * Structure so you may no longer need it   * proc_register_dynamic   * /  #if LINUX_VERSION_CODE> KERNEL_VERSION (2,4,0)Our_Proc_File = create_proc_read_entry ("test", 0444, NULL, procfile_read, NULL);if (Our_Proc_File == NULL)return -ENOMEM;differentReturns 0;  #different  Returns proc_register (& proc_root, & our_Proc_File);  #end if#different  return proc_register_dynamic (& proc_root, & our_Proc_File);#end if   / * proc_root is the root phonebook of proc   3.fs (/ proc). Every time we want our file to remain the same?   * situated.   * //* Clean ; unsubscribe our file from / proc * /void cleanup_module () #if LINUX_VERSION_CODE> KERNEL_VERSION (2,4,0)remove_proc_entry ("test", NULL);  #different  proc_unregister (& proc_root, Our_Proc_File.low_ino);  #end if  MODULE_LICENSE ("GPL"); 

    proc file system source code

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