free pointer

os2 · 02-23-2005, 07:58 AM

hi

habitually, i free when i do a malloc...
but i see sometime on the web some people who free pointer created without maloc

Code:

void checkIO()
{
	struct conn *conn_ptr = conns;

	while(conn_ptr != NULL) {
		if(fdIsReadable(conn_ptr->fd))
			doIO(conn_ptr);
		conn_ptr = conn_ptr->next;
	}
}

here some people will do after the while:

Code:

free(conn_ptr );

thanks

itsme86 · 02-23-2005, 09:07 AM

Perhaps conns is allocated somewhere. It's the same as doing like this:

Code:

{
  int *a = malloc(sizeof(int));
  int *b = a;

  free(b);
}

b and a both point to the same memory so you can pass either one to free().