At 2012-06-19 20:27:55,"Marc Lehmann" <[email protected]> wrote:
>The debian manpage is explicit though:
>
> if size is equal to zero, and ptr is not NULL, then the call is
> equivalent to free(ptr)
>
After doing some research, I think the issue is not about realloc(ptr, 0), it's
about realloc(NULL, 0). According to C99 standard, malloc()
If the size of the space requested is zero, the behavior is
implementation-defined.
realloc()
If ptr is null, the realloc function behaves like the malloc function
for the specified size.According to glibc, If n is zero, malloc returns
a minumum-sized chunk. (The minimum
size is 16 bytes on most 32bit systems, and 24 or 32 bytes on 64bit
systems.)
And, just adding some trace to libev, we can find between ev_loop_new() and
ev_loop_destroy(), several ev_realloc_emual(NULL, 0), by default realloc(NULL,
0) was triggered. This can explain where the memory leaks are from. And it's
better for libev to deal with this situation.
ev_realloc_emul: ptr (nil), size 764, return 0x94ef008
ev_realloc_emul: ptr (nil), size 768, return 0x94ef308
ev_realloc_emul: ptr 0x94ef308, size 0, return (nil)
ev_realloc_emul: ptr (nil), size 0, return 0x94ef308
ev_realloc_emul: ptr (nil), size 0, return 0x94ef318
ev_realloc_emul: ptr (nil), size 0, return 0x94ef328
ev_realloc_emul: ptr (nil), size 0, return 0x94ef338
ev_realloc_emul: ptr (nil), size 0, return 0x94ef348
ev_realloc_emul: ptr (nil), size 0, return 0x94ef358
ev_realloc_emul: ptr (nil), size 0, return 0x94ef368
ev_realloc_emul: ptr (nil), size 0, return 0x94ef378
ev_realloc_emul: ptr (nil), size 0, return 0x94ef388
ev_realloc_emul: ptr (nil), size 0, return 0x94ef398
ev_realloc_emul: ptr (nil), size 0, return 0x94ef3a8
ev_realloc_emul: ptr (nil), size 0, return 0x94ef3b8
ev_realloc_emul: ptr (nil), size 0, return 0x94ef3c8
ev_realloc_emul: ptr (nil), size 0, return 0x94ef3d8
ev_realloc_emul: ptr (nil), size 0, return 0x94ef3e8
ev_realloc_emul: ptr (nil), size 0, return 0x94ef3f8
ev_realloc_emul: ptr (nil), size 0, return 0x94ef408
ev_realloc_emul: ptr (nil), size 0, return 0x94ef418
ev_realloc_emul: ptr (nil), size 0, return 0x94ef428
ev_realloc_emul: ptr (nil), size 0, return 0x94ef438
ev_realloc_emul: ptr (nil), size 0, return 0x94ef448
ev_realloc_emul: ptr 0x94ef008, size 0, return (nil)
----------
ylfroy
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