MEMPOOL_ALLOC(9) Memory Management in Linux MEMPOOL_ALLOC(9)NAME
mempool_alloc - allocate an element from a specific memory pool
void * mempool_alloc(mempool_t * pool, gfp_t gfp_mask);
pointer to the memory pool which was allocated via mempool_create.
the usual allocation bitmask.
this function only sleeps if the alloc_fn function sleeps or returns NULL. Note that due to preallocation, this function *never* fails when
called from process contexts. (it might fail if called from an IRQ context.)
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 MEMPOOL_ALLOC(9)
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CALL_USERMODEHELPER_(9) Module Support CALL_USERMODEHELPER_(9)NAME
call_usermodehelper_setup - prepare to call a usermode helper
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);
path to usermode executable
arg vector for process
environment for process
gfp mask for memory allocation
an init function
a cleanup function
arbitrary context sensitive data
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 3.10 June 2014 CALL_USERMODEHELPER_(9)
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