status_t
mem_write(void* cookie, off_t position, const void* buffer, size_t* numBytes)
{
void *virtualAddress;
area_id area;
status_t status = B_OK;
/* check permissions */
if (getuid() != 0 && geteuid() != 0) {
*numBytes = 0;
return EPERM;
}
area = mem_map_target(position, *numBytes, B_WRITE_AREA, &virtualAddress);
if (area < 0) {
*numBytes = 0;
return area;
}
if (user_memcpy(virtualAddress, buffer, *numBytes) != B_OK)
status = B_BAD_ADDRESS;
delete_area(area);
return status;
}
status_t
mem_read(void* cookie, off_t position, void* buffer, size_t* numBytes)
{
void *virtualAddress;
area_id area;
/* check permissions */
if (getuid() != 0 && geteuid() != 0) {
*numBytes = 0;
return EPERM;
}
area = mem_map_target(position, *numBytes, B_READ_AREA, &virtualAddress);
if (area < 0) {
*numBytes = 0;
return area;
}
memcpy(buffer, virtualAddress, *numBytes);
delete_area(area);
return B_OK;
}
