Function os_read

src/burp/mvol.cpp:889–926

____________________________________________________________ Read a buffer's worth of data. (non-WIN_NT)

// Read a buffer's worth of data. (non-WIN_NT)
//
static void os_read(int* cnt, UCHAR** ptr)
{
	BurpGlobals* tdgbl = BurpGlobals::getSpecific();

	fb_assert(tdgbl->master);

	for (;;)
	{
		tdgbl->mvol_io_cnt = read(tdgbl->file_desc, tdgbl->mvol_io_buffer, tdgbl->mvol_io_buffer_size);
		tdgbl->mvol_io_ptr = tdgbl->mvol_io_buffer;

		if (tdgbl->mvol_io_cnt > 0) {
			break;
		}

		if (!tdgbl->mvol_io_cnt || errno == EIO)
		{
			tdgbl->file_desc = next_volume(tdgbl->file_desc, MODE_READ, false);
			if (tdgbl->mvol_io_cnt > 0)
			{
				break;
			}
		}
		else if (!SYSCALL_INTERRUPTED(errno))
		{
			if (cnt)
			{
				BURP_error_redirect(0, 220);
				// msg 220 Unexpected I/O error while reading from backup file
			}
			else
			{
				BURP_error_redirect(0, 50);
				// msg 50 unexpected end of file on backup file
			}
		}
	}
}


#else