Hi,
I playing with mmap. I have a problem with mremap function. It
doesn't allocate correct memory. All others work well.
static void *
mmap_realloc(void *ptr, Size size)
{
Size oldsize;
void *result;
int i;
char *x;
ptr = (char *) ptr - MAXALIGN(sizeof(Size));
oldsize = *((Size *) ptr);
size = MAXALIGN(size) + MAXALIGN(sizeof(Size));
ptr = mremap(ptr, oldsize,
size,
MREMAP_MAYMOVE);
if (ptr == MAP_FAILED)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory"),
errdetail("Failed on request of size %lu.",
(unsigned long) size)));
*((Size*) ptr) = size;
result = (char *) ptr + MAXALIGN(sizeof(Size));
/* check allocated memory */
x = ptr;
fprintf(stderr, "allocated memory %ld\n", size);
for (i = 0; i < size; i++)
{
if (i > oldsize)
{
*x = 0;
}
x++;
}
fprintf(stderr, "memory checked\n");
return result;
}
log:
>>>> 1 <<<>>> 1048584
>>>> 3 <<<>>> 2097216
>>>> 3 <<<>>> 9024
allocated memory 10304
memory checked
allocated memory 11584
memory checked
allocated memory 12864
gdb
Program terminated with signal 7, Bus error.
#0 mmap_realloc (size=12864, ptr=<value optimized out>) at mmap_alloc.c:357
357 *x = 0;
Missing separate debuginfos, use: debuginfo-install glibc-2.10.2-1.x86_64
(gdb) print x
$1 = 0x7f92055df000 ""
(gdb) print i
$2 = 12289
Can somebody help me?
Regards
Pavel Stehule
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