Memory Functions

Basic malloc/calloc/free functions. More...

Enumerations
enum	errorcode { ERR_NONE = 0, ERR_NO_MEM }
Functions
void *	_stp_alloc (size_t len)
	Allocates memory within a probe.
void *	_stp_calloc (size_t len)
	Allocates and clears memory within a probe.
void *	_stp_valloc (size_t len)
	Allocates and clears memory outside a probe.
void	_stp_free (void *ptr)
	Frees memory allocated by _stp_alloc or _stp_calloc.
void	_stp_vfree (void *ptr)
	Frees memory allocated by _stp_valloc.
Variables
enum errorcode	_stp_error = ERR_NONE

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Detailed Description

Basic malloc/calloc/free functions.

These will be changed so that memory allocation errors will call a handler. The default will send a signal to the user-space daemon that will trigger the module to be unloaded.

Todo:

Need error handling for memory allocations

Todo:

Some of these currently use kmalloc (GFP_ATOMIC) for small allocations. This should be evaluated for performance and stability.

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Function Documentation

void* _stp_alloc (  size_t  len  )

Allocates memory within a probe. This is used for small allocations from within a running probe where the process cannot sleep. Parameters: len  Number of bytes to allocate. Returns: a valid pointer on success or NULL on failure. Bug: Currently uses kmalloc (GFP_ATOMIC). Definition at line 31 of file alloc.c. Referenced by _stp_calloc(), and _stp_map_set_str().

void* _stp_calloc (  size_t  len  )

Allocates and clears memory within a probe. This is used for small allocations from within a running probe where the process cannot sleep. Parameters: len  Number of bytes to allocate. Returns: a valid pointer on success or NULL on failure. Bug: Currently uses kmalloc (GFP_ATOMIC). Definition at line 47 of file alloc.c. References _stp_alloc(). Referenced by _stp_map_set_stat(), and _stp_map_set_str().

void _stp_free (  void *  ptr  )

Frees memory allocated by _stp_alloc or _stp_calloc. Parameters: ptr  pointer to memory to free Definition at line 76 of file alloc.c. Referenced by _stp_list_clear(), _stp_map_key_del(), and _stp_map_set_str().

void* _stp_valloc (  size_t  len  )

Allocates and clears memory outside a probe. This is typically used in the module initialization to allocate new maps, lists, etc. Parameters: len  Number of bytes to allocate. Returns: a valid pointer on success or NULL on failure. Definition at line 62 of file alloc.c. Referenced by _stp_map_new().

void _stp_vfree (  void *  ptr  )

Frees memory allocated by _stp_valloc. Parameters: ptr  pointer to memory to free Definition at line 86 of file alloc.c. Referenced by _stp_map_del().