static void free_mapping_file(int cap, void *addr, size_t mapsize)
/* NOTE: addr needs to be the same as what was supplied by alloc_mapping_file */
{
Q__printf("MAPPING: free, cap=%s, addr=%p, mapsize=%zx\n",
cap, addr, mapsize);
smfree(&pgmpool, addr);
}
static void free_mapping_shm(int cap, void *addr, size_t mapsize)
/* NOTE: addr needs to be the same as what was supplied by alloc_mapping_shm */
{
Q__printf("MAPPING: free, cap=%s, addr=%p, mapsize=%zx\n",
cap, addr, mapsize);
munmap(addr, mapsize);
}
static void *realloc_mapping_shm(int cap, void *addr, size_t oldsize, size_t newsize)
{
void *ret;
Q__printf("MAPPING: realloc, cap=%s, addr=%p, oldsize=%zx, newsize=%zx\n",
cap, addr, oldsize, newsize);
if (newsize <= oldsize)
return mremap(addr, oldsize, newsize, MREMAP_MAYMOVE);
/* we can't expand shared anonymous memory using mremap
so we must allocate a new region and memcpy to it */
ret = alloc_mapping_shm(cap, newsize);
if (ret != MAP_FAILED) {
memcpy(ret, addr, oldsize);
free_mapping_shm(cap, addr, oldsize);
}
return ret;
}
/*
* NOTE: DPMI relies on realloc_mapping() _not_ changing the address ('addr'),
* when shrinking the memory region.
*/
static void *realloc_mapping_file(int cap, void *addr, size_t oldsize, size_t newsize)
{
Q__printf("MAPPING: realloc, cap=%s, addr=%p, oldsize=%zx, newsize=%zx\n",
cap, addr, oldsize, newsize);
if (cap & (MAPPING_EMS | MAPPING_DPMI)) {
int size = smget_area_size(&pgmpool, addr);
void *addr_;
if (!size || size != oldsize) return (void *)-1;
if (size == newsize) return addr;
/* NOTE: smrealloc() does not change addr,
* when shrinking the memory region.
*/
addr_ = smrealloc(&pgmpool, addr, newsize);
if (!addr_) {
Q_printf("MAPPING: pgrealloc(0x%p,0x%zx,) failed\n",
addr, newsize);
return (void *)-1;
}
return addr_;
}
return (void *)-1;
}
static int munmap_mapping_file(int cap, void *addr, size_t mapsize)
{
Q__printf("MAPPING: unmap, cap=%s, addr=%p, size=%zx\n",
cap, addr, mapsize);
return munmap(addr, mapsize);
}
static void *alloc_mapping_file(int cap, size_t mapsize)
{
Q__printf("MAPPING: alloc, cap=%s, mapsize=%zx\n", cap, mapsize);
return smalloc(&pgmpool, mapsize);
}
static void *alloc_mapping_shm(int cap, size_t mapsize)
{
Q__printf("MAPPING: alloc, cap=%s, mapsize=%zx\n", cap, mapsize);
return mmap(0, mapsize, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0);
}
