locate函数

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
static void show_pointer(void *p, char *descr) {
    //    printf("Pointer for %s at %p\n", descr, p);
    printf("%s\t%p\t%lu\n", descr, p, (unsigned long) p);
}
char big_array[1L<<24];    /*  16 MB */
//char huge_array[1L<<31];   /*   2 GB */
char huge_array[1L<<30];/*   1 GB */
int global = 0;
int useless() { return 0; }
int main ()
{
    void *p1, *p2, *p3, *p4;
    int local = 0;
    p1 = malloc(1L << 28);
    p2 = malloc(1L << 8);
    //p3 = malloc(1L << 32);
 p3 = malloc(1L << 16);
    p4 = malloc(1L << 8);
    show_pointer((void *) big_array, "big array");
    show_pointer((void *) huge_array, "huge array");
    show_pointer((void *) &local, "local");
    show_pointer((void *) &global, "global");
    show_pointer((void *) p1, "p1");
    show_pointer((void *) p2, "p2");
    show_pointer((void *) p3, "p3");
    show_pointer((void *) p4, "p4");
    show_pointer((void *) useless, "useless");
    show_pointer((void *) exit, "exit");
    show_pointer((void *) malloc, "malloc");
    return 0;
}

结论：由程序和运行结果可知，这个是要输出16MB和1GB在内存中所在的位置和储存的的内容，并且不断增加内存，然后再输出，以及useless,exit，malloc等等所在的地址和内容