zero size malloc
c, malloc
Solution
The behaviour is implementation defined, you will receive either a NULL pointer or an address. Calling free for the received pointer should however not cause a problem since:
- free(NULL) is ok, no operation is done
- free(address) is ok, if address was received from malloc (or others like calloc etc.)
Problem
Very simple question, I made the following program : ``` #include <stdlib.h> int main(int argc, char ** argv) { void * ptr; ptr = malloc(0); free(ptr); } ``` And it does not segfault on my machine. Is it a portable behaviour of stdlib malloc and free, or am I looking for trouble ? Edit : What seems non portable is the value returned by malloc. The question is about the malloc(0) + free combination, not the value of ptr.