In below simple c test program two printf statements return different values. ( check last four printf statements). output : – I am running it in eclipse ide and using Ubuntu Linux. Why does it behave differently? Answer In several places you are using the wrong format specifier to printf. In particular…
Tag: memory-address
Setting limit to total physical memory available in Linux
I know that I am supposed to set mem=MEMORY_LIMIT. But I do not know where to go, during runtime, or during boot time, in order to set a limit to the total physical memory that the OS has control of. I am running I/O benchmarks, and I would like to limit the amount of overall physical memory that is available…
How to access physical addresses from user space in Linux?
On a ARM based system running Linux, I have a device that’s memory mapped to a physical address. From a user space program where all addresses are virtual, how can I read content from this address? Answer You can map a device file to a user process memory using mmap(2) system call. Usually, device files…