void print_section(Elf_data* data, int i)
{
unsigned int j;
while (++i < E_SHNUM(data))
if (SH_SIZE(data, i) > 0)
{
printf("Contents of section %s:\n", &data->strtab[SH_NAME(data, i)]);
j = 0;
while (j < SH_SIZE(data, i) && SH_OFFSET(data, i) + j < data->fsize)
{
if (j == 0)
printf(" %04x\t", (unsigned int)SH_ADDR(data, i) + j);
printf("%02x", *(UCHAR(data->data) + SH_OFFSET(data, i) + j));
++j;
if (j != 0 && j % 16 == 0)
{
print_char(UCHAR(data->data) + SH_OFFSET(data, i), j - 16, j);
printf("\n %04x\t", (unsigned int)SH_ADDR(data, i) + j);
}
else if (j != 0 && j % 4 == 0)
printf(" ");
}
print_char(UCHAR(data->data) + SH_OFFSET(data, i), j - (j % 16), j);
printf("\n");
}
}
SharedMemory::SharedMemory(const char *name, Mode mode) :
mode(mode),
err(0)
{
strcpy(this->name, name);
size = sizeof(SegmentHeader);
fd = shm_open(name, mode==Master ? (O_CREAT | O_RDWR | O_EXCL) : O_RDWR, S_IRUSR | S_IWUSR);
if(fd<0)
{
err = errno;
std::cerr << "Failed to open shared memory" << std::endl;
return;
}
std::cout << "init sharedmemory " << sizeof(SegmentHeader) << std::endl;
int r=0;
if(mode==Master)r = ftruncate(fd, size);
if(r)
{
std::cerr << "Can't resize file" << std::endl;
return;
}
rptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if(mode==Master)
{
SH_SIZE(rptr) = 0;
SH_MUTEX(rptr) = 0;
}
}
void SharedMemory::resize(size_t _size)
{
if(rptr)munmap(rptr, size);
size = _size+sizeof(SegmentHeader);
if(mode==Master)
{
if(ftruncate(fd, size))
{
std::cerr << "Can't resize memory" << std::endl;
}
}
rptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if(rptr==MAP_FAILED)std::cerr << "Failed to map memory" << std::endl;
if(mode==Master)SH_SIZE(rptr) = size;
}
size_t SharedMemory::getSize()
{
return SH_SIZE(rptr);
}
void SharedMemory::autoResize()
{
resize(SH_SIZE(rptr));
}
