event_action Command-Line Option

The –event_action command-line option is the most complex of the command line option. Its format is as follows:

–event_action “event=action list”

Specifies one or more actions that the script should perform if an event occurs. The “event=action list” consists of comma-separated set event=action pairs. For example:

"alloc_null=save_memory_debugging_file, \

dealloc_notification=list_allocations"

event can be:

Event	Explanation
addr_not_at_start	A block is being freed, and the address is not at the beginning of the block.
alloc_not_in_heap	The block being freed is not in the heap.
alloc_null	The malloc() function returned a null block.
alloc_returned_bad_alignment	The block is misaligned.
any_memory_event	All memory notification events.
bad_alignment_­argument	The block returned by the malloc library is not aligned on a byte boundary required by your operating system. The heap may be corrupted. (This is not a program error.)
double_alloc	Allocator returned a block already in use. The heap may be corrupted.
double_dealloc	Program is attempting to free a block already freed.
free_not_allocated	Program is attempting to free a block that was not allocated.
guard_corruption	Guard corruption was detected when program deallocated a block.
hoard_low_memory_threshold	Hoard low memory threshold is crossed.
realloc_not_­allocated	Program attempted to reallocate a block that was not allocated.
rz_overrun	Program attempted to access memory beyond end of allocated block.
rz_underrun	Program attempted to access memory before start of allocated block.
rz_use_after_free	Program attempted to access block after it was deallocated.
rz_use_after_free_overrun	Program attempted to access memory beyondend of deallocated block.
rz_use_after_free_underrun	Program attempted to access memory before start of deallocated block.
termination_­notification	Program is about to execute its _exit routine.

action is as follows:

Action	Explanation
check_guard_blocks	Check for guard blocks and generates a corruption list.
list_allocations	Create a list of all your program’s allocations.
list_leaks	Create a list of all of your program’s leaks.
save_html_heap_­status_source_­view	Save the Heap Status Source report as an HTML file.
save_memory_­debugging_file	Save a memory debugging file; you can reload this file at a later time.
save_text_heap_status_source_­view	Save the Heap Status Source report as a text file.