Thread: parse error

Can someone tell me what this error means: parse error before string constant

Here is my code - for some reason I can't get the SPRINTF line to work because of the error... Thanks

Code:

#include<linux/kernel.h>
#include<linux/module.h>
#include<linux/proc_fs.h>
#include<asm/uaccess.h>

#define BUF_LEN 50
#define MESSAGE_LENGTH 80

static char Message[MESSAGE_LENGTH] ;
char message[MESSAGE_LENGTH+30] ;

static ssize_t module_output(
   struct file *file,
   char *buf,
   size_t len,
   loff_t *offset);

static ssize_t module_input(
   struct file *file,
   const char *buf,
   size_t length,
   loff_t *offset);
   
sprintf(message, "Last input:%s", Message) ;

int read_my_clock( char *a, char **b, off_t c, int d, int e)
{
   printk(KERN_ALERT, "\nread_my_clock\n") ;
   /* this is the function that I write to read
      the clock file info that I created in proc
   */
}

struct proc_dir_entry dc_clock_mod_file = {
  0,
  12,
  "dc_clock_mod",
  S_IFREG | S_IRUGO,
  1,
  0,
  0,
  BUF_LEN,
  NULL,
  read_my_clock,
  NULL
};

int init_module()
{
   return proc_register(&proc_root, &dc_clock_mod_file);
}

void cleanup_module()
{
   proc_unregister(&proc_root, dc_clock_mod_file.low_ino) ;
}

I am using the GCC compiler so you may have to use this line to compile.

gcc -I /usr/include -c -D__KERNEL__ -DMODULE <filename>

Youre right. I moved sprintf inside my function and it worked...

Thanks

Okay, I move the sprintf line inside my init_module function... the code now compiles okay...

I am trying to use sprintf to write a string from the message buffer to my file that I create in /proc. The module name is dc_clock_mod - seen in my code.... here is the new code. Thanks

Code:

#include<linux/kernel.h>
#include<linux/module.h>
#include<linux/proc_fs.h>
#include<asm/uaccess.h>

#define BUF_LEN 50
#define MESSAGE_LENGTH 80

static char Message[MESSAGE_LENGTH] ;
char message[MESSAGE_LENGTH+30] ={"873675 97325"} ;

static ssize_t module_output(
   struct file *file,
   char *buf,
   size_t len,
   loff_t *offset);

static ssize_t module_input(
   struct file *file,
   const char *buf,
   size_t length,
   loff_t *offset);
   

int read_my_clock( char *a, char **b, off_t c, int d, int e)
{
   printk(KERN_ALERT, "\nread_my_clock\n") ;
   /* this is the function that I write to read
      the clock file info that I created in proc
   */
}

struct proc_dir_entry dc_clock_mod_file = {
  0,
  12,
  "dc_clock_mod",
  S_IFREG | S_IRUGO,
  1,
  0,
  0,
  BUF_LEN,
  NULL,
  read_my_clock,
  NULL
};

int init_module()
{
   return proc_register(&proc_root, &dc_clock_mod_file);
   sprintf(message, "Last input:%s", Message) ;
}

void cleanup_module()
{
   proc_unregister(&proc_root, dc_clock_mod_file.low_ino) ;
}

fprintf is onfly available through the stdio.h library.

I can't use it. Kernel modules in linux will not recognize fprintf...


I figured it out. Thanks for the input.

Um, sprintf is defined in stdio.h as well.

http://www.cplusplus.com/ref/cstdio/sprintf.html

I can't use it. Kernel modules in linux will not recognize fprintf...

Problem solved, anyway...

I found that I can use copy_from_user() to get the desired results...


Peace