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