call_usermodehelper_setup (9) - Linux Manuals

call_usermodehelper_setup: prepare to call a usermode helper

Command to display call_usermodehelper_setup manual in Linux: $ man 9 call_usermodehelper_setup

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.