CALL_USERMODEHELPER_(9)                   Module Support                  CALL_USERMODEHELPER_(9)



NAME
       call_usermodehelper_setup - prepare to call a usermode helper

SYNOPSIS
       struct subprocess_info * call_usermodehelper_setup(char * path, char ** argv,
                                                          char ** envp, gfp_t gfp_mask,
                                                          int (*init) (struct subprocess_info *info, struct cred *new),
                                                          void (*cleanup) (struct subprocess_info *info),
                                                          void * data);

ARGUMENTS
       path
           path to usermode executable

       argv
           arg vector for process

       envp
           environment for process

       gfp_mask
           gfp mask for memory allocation

       init
           an init function

       cleanup
           a cleanup function

       data
           arbitrary context sensitive data

DESCRIPTION
       Returns either NULL on allocation failure, or a subprocess_info structure. This should be
       passed to call_usermodehelper_exec to exec the process and free the structure.

       The init function is used to customize the helper process prior to exec. A non-zero return
       code causes the process to error out, exit, and return the failure to the calling process

       The cleanup function is just before ethe subprocess_info is about to be freed. This can be
       used for freeing the argv and envp. The Function must be runnable in either a process
       context or the context in which call_usermodehelper_exec is called.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   CALL_USERMODEHELPER_(9)