Calling call_usermodehelper from kernel thread

[Swapnil Nagle <swaps@protonic.com>]

Hi all,

We need to write a file from a kernel thread. So we are 
using call_usermodehelper() to invoke a user space program 
to write the file.

Something like this:
kernel thread:
               set up argvp & envp;
               call_usermodehelper("my_program",argvp,envp);

my_program:

          int main(int argc,char**argvp,char **envp){
              
              printf("Hello world");
              write_file();
          }

The problem is that control is not coming to my_program 
since the "hello world" message does not get printed. 

What could be the problem ? Any other method to write a file
from kernel thread would also be welcome.

Thanks in advance.
Swapnil.



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