Does malloc() use brk() or mmap()?
If we change the program to see where the malloc‘d memory is: #include <unistd.h> #include <stdio.h> #include <stdlib.h> void program_break_test() { printf(“%10p\n”, sbrk(0)); char *bl = malloc(1024 * 1024); printf(“%10p\n”, sbrk(0)); printf(“malloc’d at: %10p\n”, bl); free(bl); printf(“%10p\n”, sbrk(0)); } int main(int argc, char **argv) { program_break_test(); return 0; } It’s perhaps a bit clearer that … Read more