There is more than one way to define “memory leak”. In particular, there are two primary definitions of “memory leak” that are in common usage among programmers. The first commonly used definition of “memory leak” is, “Memory was allocated and was not subsequently freed before the program terminated.” However, many programmers (rightly) argue that certain … Read more
There’s no “step-by-step” here. When initialization is performed with constant expressions, the process is essentially performed at compile time. Of course, if the array is declared as a local object, it is allocated locally and initialized at run-time, but that can be still thought of as a single-step process that cannot be meaningfully subdivided. Designated … Read more
You are attempting to link your project in such a way that the target of a relative addressing scheme is further away than can be supported with the 32-bit displacement of the chosen relative addressing mode. This could be because the current project is larger, because it is linking object files in a different order, … Read more
The invalid option is because fgets() keeps the ‘\n’ when you press enter, try this when you are trying to call ls -l you are passing “-l\n” as the option, hence the message. You will have to change to
Like @thejh said your stream seems to be buffered. Data is not yet written to the controlled sequence. Instead of fiddling with the buffer setting you could call fflush after each write to profit from the buffer and still enforce the desired behavior/display explicitly.
The move instruction copies a value from one register to another. The li instruction loads a specific numeric value into that register. For the specific case of zero, you can use either the constant zero or the zero register to get that: There’s no register that generates a value other than zero, though, so you’d have to use li if you wanted some … Read more
Before I read your code. Valgrind reporting invalid free error is not because of leaked memory, but you try to free invalid memory (or free same memory more than once). Compiling your code with the compilter flag -g (gdb debug), will enable more debug information, making the backtraces from valgrind much better. A quick guess:
I’m learning C and I’m still not sure if I understood the difference between & and * yet. Allow me to try to explain it: I got these, but then it becomes confusing. So, both funct(*a) and funct(&a) are correct, right? What’s the difference?
Try, instead of, You should not initialize the array elements inside the structure.
It’s probably: This is a common idiom for zeroing a register on x86. This would correspond with i = 0 in the C code. If you are curious “but why ?” the short answer is that the xor instruction is fewer bytes than mov $0, %ebx. The long answer includes other subtle reasons. I am … Read more