C Memory.

Manual memory in C: allocation, lifetime, and the ways it goes wrong. Covers 12 sub-skills.

• C Memory · 1 of 3

  Object Lifetime & Dangling Pointers

  Calling free(p) leaves the variable p in which state?

  AAutomatically reset to a null pointerBZeroed out along with the whole blockCPointing at a fresh block of that sizeDStill holding the old unusable bits

• C Memory · 2 of 3

  calloc & realloc

  What happens to the original block when realloc fails to resize it?

  AIt is marked read only until it is freedBIt is shrunk to whatever size did fitCIt is freed before the NULL is returnedDIt is left untouched and still valid

• C Memory · 3 of 3

  Buffer Overflows

  Valgrind memcheck watches which class of memory for out of range access?

  AGlobal objects that the loader maps at start upBBlocks handed out by malloc and its relativesCEvery object the program names, wherever it livesDLocal arrays that live in the frame of a function