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sbrk一种函数，能够修改程序BSS段的大小。

返回值：函数调用成功泪只狼霉返回一船主坑指针，狱备备指向下一个内存空间。函数调用失败则返谅嫌雅体回（void*）-1,将errno设为ENOMEM。

程序旬拘欢例:

#include <stdio.h>

#include <alloc.h>

int main(void)

{

printf("Changing allocation with sbrk()\n"享谜);

printf("组验壳Before sbrk() call: %lu bytes free\n",

(unsigned long) coreleft());

sbrk(1000);

printf(" After sbrk() call: %lu bytes free\n",

(unsigned long) coreleft());

return 0;

}