call_usermodehelper_setup
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## 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.

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